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SCHEDULE 14A

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Securities Exchange Act of 1934

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LIMELIGHT NETWORKS, INC.

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Limelight Q&A

GENERAL

EMPLOYEES

25. What should I say if I am asked about this announcement by members of the media or other third parties?

26. Who can I contact if I have more questions?

CLIENTS

VENDORS / BUSINESS PARTNERS

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Employee Letter

Dear First Team,

I am thrilled to share some exciting news — the next transformative step in Limelight’s journey to become a leader in edge-enabled software solutions. We have entered into an agreement to acquire Yahoo’s Edgecast, a leading provider of edge security, content delivery and video services.

Together we will create a powerful platform to deliver improved performance, productivity and security, and enhance our value proposition to clients and outcome buyers in the fast-growing edge computing market. The combined company — to be named Edgio — will be the leading solutions provider for clients looking to deliver a fast, secure and frictionless digital experience to end-users. This transaction is not about changing our strategy, but rather about accelerating and building on all that we have accomplished together. Notably, we are partnering with Apollo, one of the largest asset managers serving many of the world’s most sophisticated investors, and they are making a significant investment in the combined company, which demonstrates tremendous support for our growth strategy and innovative vision.

Our timing could not be better, as improving the speed and performance of websites and enterprise apps, supporting high-resolution streaming video and preventing costly cybersecurity breaches have only become more critical to the valued clients we serve. As Edgio, we will be better positioned to serve companies of all sizes by leveraging the scale of our shared networks and capabilities to deliver best-in-class edge solutions and proprietary web security offerings. I look forward to our talented organizations working together to create enhanced value for all our combined stakeholders.

In terms of next steps, we currently expect the transaction to close in the second half of 2022. Until then, Limelight and Edgecast will continue to operate as separate companies, and no one should use the Edgio brand until corporate marketing provides resources, and a transition plan for implementation. All of us at Limelight should remain focused on our day-to-day responsibilities and delivering the best experience possible to our clients. Following the close, I will lead Edgio as the company’s CEO and together, we will continue to achieve what many did not think was possible. I cannot emphasize enough the importance of staying focused on our clients and the critical work we do every day. As we have material updates, we will hold First Team meetings to keep you informed regarding our progress toward closing and integration planning.

I have included this morning’s press release and will also hold a First Team meeting today at 4pm MST/6pm ET where we’ll discuss this combination and what it means. You should receive an invitation shortly, and I look forward to speaking with all of you. This call will be recorded and posted shortly after, for those unable to attend.

On behalf of the ELT, thank you for your continued dedication to our clients, shareholders and the entire First Team. I hope you share my excitement for our future as Edgio and the opportunities ahead!

All the best,

Bob

ENCLOSURES: Press Release and Employee FAQ

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed

transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Senior Leader Toolkit

Overview

This morning, we announced that we have entered into an agreement to acquire Edgecast, a leading provider of edge security, content delivery and video services. Additionally, Limelight will rebrand as Edgio and following the close of the transaction, the combined company will continue as Edgio – will be a leading solutions provider of choice for outcome-oriented businesses and clients looking to deliver a fast, secure and frictionless digital experience to end-users. This is a transformative transaction for Limelight and represents another step in our journey to become the global leader in edge-enabled software solutions.

Your Role

As First Team senior leaders, you play an important role in ensuring team members and other stakeholders have consistent information about the benefits of this transaction and what it means for them. Your teams will have questions, and we want to make sure you’re equipped with the resources to address as many of them as possible. This document and the attached materials are designed to assist you.

Attached and/or below you will find:

Keep in mind how you discuss this announcement will affect how your team members respond. We will have a global First Team meeting at 4:00 p.m. MT (Arizona). Following that, we need all of you to schedule and hold separate follow-up meetings with your respective teams to discuss the announcement in further detail and address questions. Please stay positive and forward-looking and encourage people to think and act constructively. Employees with material questions or concerns that you are unable to address should speak to their First Team leader or reach out to People Experience. In addition, it is important to reiterate that this should have no impact on our day-to-day operations, and we remain focused on continuing to deliver the best experience possible for our clients and building on the great momentum we’ve already seen this year.

Communications Guidelines

As you familiarize yourself with these materials, please keep in mind:

“That’s a great question. It is early in the process, and I do not have all the answers today. I will look into that and get back to you as soon as I can.”

Talking Points for Use With Employees

What We Announced

What This Means for Employees

Next Steps / Closing

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed

transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Edgecast Employee Letter from Bob Lyons

Subject: Let’s Be Legendary!

Edgecast Team,

On behalf of the entire Limelight team, I am emailing to welcome you to our new company and share our excitement in uniting with you.                

Together as Edgio, we will create a global leader in edge-enabled software solutions to deliver improved online performance, productivity and security to an exceptional base of clients, including some of the world’s leading technology companies, streaming services and most-visited websites.

Many of you likely know about, and have an opinion of, Limelight. What you may not know is that since I joined Limelight a little over a year ago, we’ve been radically transforming this company to address many of the challenges we faced to become an industry leader in edge access, content delivery and web applications services. Like Edgecast, our clients trust us to serve the highest-quality digital experiences to their customers around the world, such as livestreamed sporting events, global movie launches, video games and file downloads for new phone apps. We have made incredible progress with this strategy and continue to be energized by the momentum across the business. Our combination will only accelerate and build on all we have done across our organizations to create the global leader in best-in-class, scaled edge solutions.                

I have an enormous amount of respect for Edgecast. Similar to Limelight, Edgecast is a client-centric company with a commitment to empowering and improving the digital world through innovative tools and secure edge access. As Edgio, we will enhance our shared scale and geographic reach, creating a global leader in the software-defined edge compute and delivery market with an expanded security business. We believe that Limelight and Edgecast are ideal strategic partners in every way.

As a combined organization, we will incorporate these shared values, as well as the best practices of both companies, to ensure continuity for clients, employees and shareholders. We look forward to keeping you informed regarding our combined operations post-close as we have updates to share. In the meantime, we created a microsite to begin sharing relevant information and resources with you. You should receive access instructions following the First Team meeting.

A key factor to our ongoing success will be each of you. We will rely on you to continue to deliver edge-enabled solutions to an expanded base of clients and to provide exceptional digital experiences for their end users.

I look forward to meeting as many of you as I can in the coming months to discuss the transaction in greater detail and the opportunities ahead. I am excited about partnering together and look forward to our bright future.

All the best,

Bob

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or

investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Edgecast Employee Letter from Ariff Sidi

Email:

From: Ariff

BCC: Distros in spreadsheet. Ariff’s Team + approx. 20 Employees outside of Ariff’s org 

Subject: Update on Edgecast

Team,

I am excited to share that Edgecast has announced an agreement to merge with Limelight Networks, Inc.

Limelight is a leading provider of content delivery and web applications solutions with a global edge network much like our own. Edgecast, as you well know, is a leading provider of content delivery, cloud security and video solutions. Together, this powerful combination of capabilities will accelerate the ambitions of both companies to create a market-leading, edge-enabled software solutions provider capable of delivering improved performance, productivity, media and security to our customers in the fast-growing edge solutions market.

Our new company — to be named Edgio — will be the go-to provider for customers looking to deliver a fast, secure and frictionless digital experience to end-users.

This is the right time to enhance our scale and reach, as improving the speed and performance of websites and enterprise apps, supporting the growth of OTT, preventing cybersecurity incidents and helping customer workloads migrate to the edge have only become more critical to the businesses we serve. Limelight shares our customer-centric approach and drive to innovate, and joining our talented organizations will drive growth and create value for all our stakeholders.

We currently expect the transaction to close in the [second half of 2022]. Until then, Edgecast and Limelight will continue to operate as separate companies, and all of us must remain focused on serving our customers and delivering on our day-to-day responsibilities. Upon closing, Bob Lyons, CEO of Limelight, will lead Edgio. I have had several opportunities to spend time with Bob and I am excited to partner with him on this incredible opportunity for both businesses. We will keep you informed regarding plans to combine our operations and what this next chapter will mean for each of you.

I have attached this morning’s press release [, along with an FAQ to answer initial questions]. We will also hold an All-Hands meeting on DATE at TIME where we will discuss this combination in more detail. Keep an eye out for an invitation to this meeting and I look forward to connecting with you all there.

We have an incredibly talented team and I am constantly thankful for your dedication to the business, each other and our customers. I believe this merger provides us a unique opportunity to disrupt our industry and to further excel and win, and I hope you share my excitement for Edgecast’s future as part of Edgio.

Sincerely,

Ariff Sidi

GM, Edgecast

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of

Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Edgecast Senior Leader Briefing Talking Points

What We Announced

Why The Spinoff Makes Sense

What This Means for Employees

Next Steps / Closing

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Client Letter

Greetings from Limelight!

We are emailing today to share exciting news – Limelight has entered into an agreement to unite with Edgecast. Together, we will create a globally scaled, powerful platform to deliver improved performance, productivity and security, enhancing our value and service to you. As the demands you face in data, digital content, media and entertainment continue to grow rapidly, our comprehensive, combined solutions will better enable us to serve you and provide a fast, secure and frictionless digital experience to your customers.

We currently expect the transaction to close in the second half of 2022 and upon closing, our combined company will be named Edgio. Until then, Limelight and Edgecast will continue to operate as separate companies, and we will continue to work with you as we always have, delivering the high-quality service and support for which Limelight is known. We’re excited about bringing you Edgio’s combined capabilities and look forward to better serving your needs, today and into the future.

To learn more about this exciting news, please read our press release https://investors.limelight.com/news/press-releases/news-details/2022/Limelight-to-Acquire-Yahoos-Edgecast-Creating-Global-Leader-in-Edge-Enabled-Software-Solutions/default.aspx or visit https://investors.limelight.com/corporate-profile/default.aspx. If you have questions, please reach out to your main contact(s) or Client Support at Limelight. On behalf of the entire Limelight team, thank you for your continued support.

Sincerely,

INSERT

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of

Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Client Talking Points

What We Announced

What This Means for Clients

Next Steps / Closing

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the

transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Business Partner Letter

Dear [Valued Partner / INSERT GREETING],

We’re excited to share that Limelight has announced an agreement to acquire Edgecast, a leading provider of edge security, content delivery and video services, to create a global leader in edge-enabled software solutions. The companies’ press release can be found here: https://investors.limelight.com/news/press-releases/news-details/2022/Limelight-to-Acquire-Yahoos-Edgecast-Creating-Global-Leader-in-Edge-Enabled-Software-Solutions/default.aspx.

By uniting Limelight and Edgecast, we’re building a powerful platform to enhance our value proposition in one of the fast-growing edge computing markets. The combined company — to be named Edgio — will be the leading solutions provider for businesses looking to deliver a fast, secure and frictionless experience to their clients. With enhanced scale and geographic reach to drive growth, Edgio will be positioned to expand our partnership with you as a valued business partner.

We currently expect the transaction to close in the second half of 2022. Until then, Limelight and Edgecast will continue to operate as separate companies, and your Limelight contacts and contract remain the same. As we move through the details of integrating our companies, we will work with you well in advance on any changes we may need to make.

We value our relationship with your organization and will continue to work together to ensure we meet our clients’ needs. Please continue to reach out to [me / your regular Limelight contact] with questions.

Thank you for your continued support.

Sincerely,

NAME

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,”

“believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Business Partner Talking Points

What We Announced

What This Means for Vendors and Business Partners

Next Steps / Closing

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results

could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Limelight Investor Analyst Email

Dear [NAME],

This morning, Limelight issued a press release https://investors.limelight.com/news/press-releases/news-details/2022/Limelight-to-Acquire-Yahoos-Edgecast-Creating-Global-Leader-in-Edge-Enabled-Software-Solutions/default.aspx announcing that it has agreed to acquire Edgecast, a business unit of Yahoo, in an all-stock transaction.

We will be hosting an investor call THIS MORNING at 8:00 a.m. ET (6:00 a.m. MT) to discuss the transaction. 

The press release announcing the transaction can be found here and the presentation is here.

We will also be arranging 15-minute one-on-one conversations with our management team and I have you scheduled for today @ TIME. Please let me know if this works on your end.

Key highlights of the combination:

We look forward to speaking with you soon.

Best regards,

Jutta Ward

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward- looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Industry Analyst Email

Dear [INSERT INDUSTRY ANALYST NAME],

We’re pleased to share that Limelight has announced an agreement to acquire Edgecast, a business unit of Yahoo.

The combination will create a global leader in edge-enabled software solutions and is the next step in Limelight’s ongoing transformation from its content delivery network roots. The combined company – to be named Edgio – will deliver significantly improved network performance and traffic efficiency, coupled with natively integrated cloud security, video platform and web applications.

Key highlights from the press release https://investors.limelight.com/news/press-releases/news-details/2022/Limelight-to-Acquire-Yahoos-Edgecast-Creating-Global-Leader-in-Edge-Enabled-Software-Solutions/default.aspx and materials on the Limelight IR website https://investors.limelight.com/corporate-profile/default.aspx:

The companies currently expect the transaction to close in the second half of 2022. [Edgio] expects to operate both the Limelight and Edgecast networks [for the first 12 months post-close] and fully integrate into one network in 2023.

Please let me know if you have questions. We look forward to briefing you soon on this announcement and our future as Edgio.

Best regards,

Sameet Sinha

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Industry Analyst Talking Points

What We Announced

Creating A Global Leader in Edge-Enabled Software Solutions

Next Steps

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight LinkedIn

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the

possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Twitter

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

Limelight Facebook

Cautionary Note Regarding Forward-Looking Statements

To the extent any statements made in this communication contain information that is not historical, these statements are forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended, and Section 21E of the U.S. Securities Exchange Act of 1934, as amended (collectively, “forward-looking statements”). Certain statements in this communication may constitute forward-looking statements, which reflect the expectations of Limelight’s management regarding the business prospects and opportunities of Limelight and the transaction. The use of words such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “endeavor,” “potential,” “continue” or the negative of such words or other similar expressions can be used to identify forward-looking statements. Limelight’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors including but not limited to risks related to the satisfaction or waiver of the conditions to closing the proposed transaction (including the failure to obtain necessary regulatory, court and Limelight’s stockholder approvals) in the anticipated timeframe or at all, including the possibility that the proposed transaction does not close; the response of customers, business partners and competitors to the announcement of the proposed transaction, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction; the possibility of significant unexpected transaction costs; risks associated with the disruption of management’s attention from ongoing business operations due to the proposed transaction; the company’s ability to achieve projected revenue increase, to realize run-rate cost synergy opportunities and/or market expansion fail to meet expectations; and unknown liabilities and the risk of litigation and/or regulatory actions related to the proposed transaction. Please also refer to the factors discussed under “Risk Factors” and “Special Note Regarding Forward-looking Information” in Limelight’s Annual Report on Form 10-K for the year ended December 31, 2021, with the U.S. Securities Exchange Commission (“SEC”), each as updated by Limelight’s continuous disclosure filings, which are available at www.sec.gov.

Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. All forward-looking statements herein are qualified in their entirety by its cautionary statement and are made as of the date of this communication. Limelight disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Additional Information and Where to Find It

This communication is not intended to and does not constitute an offer to sell or the solicitation of an offer to subscribe for or buy or an invitation to purchase or subscribe for any securities or the solicitation of any vote, consent or approval in any jurisdiction, nor shall there by any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. This communication has been prepared in respect of the proposed transaction involving Limelight and Edgecast pursuant to the terms of the definitive agreement, and may be deemed to be soliciting material relating to the transaction. In connection with the transaction, Limelight will file a proxy statement on Schedule 14A relating to a special meeting of the stockholders with the SEC. Additionally, Limelight will file other relevant materials in connection with the transaction with the SEC. Investors and securityholders of

Limelight are urged to read the proxy statement and/or consent solicitation documents regarding the transaction and any other relevant materials carefully in their entirety when they become available before making any voting or investment decision with respect to the transaction because they will contain important information about the transaction and the parties to the definitive agreement. The definitive proxy statement will be mailed to holders of Limelight’s stock. Stockholders will be able to obtain a copy of the proxy statement, as well as other filings containing information about the transaction and the parties to the definitive agreement made by Limelight with the SEC free of charge on EDGAR at www.sec.gov, or on Limelight’s website at www.limelight.com. Information contained on, or that may be accessed through, the websites referenced in this communication is not incorporated into and does not constitute a part of this communication. We have included these website addresses only as inactive textual references and do not intend them to be active links.

Participants in the Solicitation

Limelight and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Limelight in respect of the transaction. Information about Limelight’s directors and executive officers is set forth in the proxy statement for Limelight’s 2021 Annual Meeting of Stockholders, which was filed with the SEC on April 23, 2021. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.