SUMMARY

This summary highlights material information from this proxy statement/prospectus. It may not contain all of the information that is important to you. We urge you to read carefully the entire proxy statement/prospectus and the other documents to which we refer to fully understand the merger and the related transactions. See “Where You Can Find More Information” on page 164. Each item in this summary refers to the page of this proxy statement/prospectus on which that subject is discussed in more detail.

Market Price and Dividend Data (page 153)

Limelight’s common stock has traded on the Nasdaq Global Market under the symbol “LLNW” since Limelight’s initial public offering on June 7, 2007. There is currently no public market for EyeWonder’s common stock. On December 18, 2009, the last full trading day prior to the public announcement of the proposed merger, the closing sale price of Limelight common stock was $3.79 per share. On [            ], 2010, the last full trading day prior to the printing of this proxy statement/prospectus, the closing sale price of Limelight common stock was at $[            ] per share.

The market price of Limelight common stock will fluctuate prior to and after the closing of the first-step merger. You should obtain current market quotations for the shares.

Risks Relating to the Merger (page 26)

In evaluating the merger agreement or the issuance of shares of Limelight common stock in the merger, you should carefully read this proxy statement/prospectus and especially consider the factors discussed in the section entitled “Risks Factors — Risks Relating to the Merger” on page 26, as well as the additional risk factors discussed in the section entitled “Risk Factors” that relate to Limelight or EyeWonder, respectively.

Information About the Companies

Limelight Networks, Inc. (page 59). Limelight Networks, Inc. was established in June 2001 as a limited liability company and converted into a Delaware corporation in August 2003. Limelight is a provider of high- performance content delivery network services. Limelight delivers content for traditional and emerging media companies, or content providers, including businesses operating in the television, music, radio, newspaper, magazine, movie, videogame, software and social media industries as well as enterprises and government entities doing business online. The principal executive offices of Limelight are located at 2220 W. 14^th Street, Tempe, AZ 85281, and its telephone number is (602) 850-5000.

Elvis Merger Sub One Corporation (page 59). Elvis Merger Sub One Corporation, a wholly owned subsidiary of Limelight, was formed solely for the purpose of completing the merger and is incorporated in Delaware. The principal executive offices of Elvis Merger Sub One Corporation are located at 2220 W. 14^th Street, Tempe, AZ 85281, and its telephone number is (602) 850-5000.

Elvis Merger Sub Two LLC (page 59). Elvis Merger Sub Two LLC, a wholly owned subsidiary of Limelight, was formed solely for the purpose of completing the merger and is incorporated in Delaware. The principal executive offices of Elvis Merger Sub Two LLC are located at 2220 W. 14^th Street, Tempe, AZ 85281, and its telephone number is (602) 850-5000.

EyeWonder, Inc. (page 59). EyeWonder, Inc., a Delaware corporation, was incorporated in December 1999. EyeWonder is a provider of interactive digital advertising products and services. EyeWonder creates and executes high-impact online video and rich media advertising campaigns and provides advertisers, advertising

agencies and content publishers the ability to create, build, deliver, track and optimize interactive advertising campaigns. The principal executive offices of EyeWonder are located at 229 Peachtree Street NE, International Tower Suite 1700, Atlanta, GA 30303, and its telephone number is (678) 891-2020.

The Limelight Special Meeting (page 62)

The special meeting of Limelight stockholders will be held on April 30, 2010 at 9:00 a.m., local time, at the Sheraton Phoenix Airport Hotel Tempe, located at 1600 South 52^nd Street, Tempe, AZ 85281. At the special meeting, Limelight stockholders will be asked to:

Only holders of record at the close of business on March 31, 2010 will be entitled to vote at the special meeting. Each share of Limelight common stock is entitled to vote. As of the record date, [            ] shares of Limelight common stock were outstanding, held by approximately [            ] registered holders.

Approval of the issuance of Limelight common stock to EyeWonder securityholders in the merger requires the affirmative vote of the holders of a majority of the shares entitled to vote on the subject matter and present in person or represented by proxy. Because approval of this proposal requires the affirmative vote of a majority of shares entitled to vote on the subject matter present in person or represented by proxy, abstentions will have the same effect as a vote against this proposal. However, the failure to vote, either by proxy or in person, and broker non-votes, will have no effect on the proposal.

Approval of the adjournment proposal requires the affirmative vote of the holders of a majority of the shares entitled to vote on the subject matter and present in person or represented by proxy at the special meeting. Because approval of this proposal requires the affirmative vote of a majority of the shares entitled to vote on the subject matter and present in person or represented by proxy at the special meeting, abstentions will have the same effect as a vote against this proposal. However, the failure to vote, either by proxy or in person, and broker non-votes, will have no effect on the adjournment proposal.

As of the record date, directors and executive officers of Limelight, and their affiliates, had the right to vote [            ] shares of Limelight common stock, or [    ]% of the outstanding Limelight common stock at that date. Limelight currently expects that each of these individuals will vote their shares of Limelight common stock in favor of the proposals to be presented at the special meeting.

The EyeWonder Special Meeting (page 66)

The special meeting of EyeWonder stockholders will be held on April 28, 2010 at 9:00 a.m., local time, at 229 Peachtree Street NE, International Tower, Suite 1700, Atlanta, Georgia 30303. At the special meeting, EyeWonder stockholders will be asked to:

Only holders of record at the close of business on March 31, 2010 will be entitled to vote at the special meeting. Each outstanding share of EyeWonder capital stock is entitled to vote. As of the record date, (i) [            ] shares of EyeWonder common stock were outstanding and entitled to vote, (ii) [            ] shares of EyeWonder Series A preferred stock were outstanding and entitled to vote, and (iii) [            ] shares of EyeWonder Series B preferred stock were outstanding and entitled to vote. Each share of EyeWonder common stock is entitled to one vote at the special meeting, each share of Series A preferred stock is entitled to one vote for each share of common stock (including fractions) into which such Series A preferred stock is convertible at the special meeting and each share of Series B preferred stock is entitled to one vote for each share of common stock (including fractions) into which such Series B preferred stock is convertible at the special meeting.

Approval of the merger proposal requires the affirmative vote of the holders of a majority of the outstanding shares of EyeWonder common stock and preferred stock entitled to vote at the special meeting (voting together as a single class). Because approval of the merger proposal is based on the affirmative vote of a majority of shares outstanding, an EyeWonder stockholder’s failure to vote or abstention will have the same effect as a vote against the merger proposal.

Approval of the proposal to convert the outstanding shares of EyeWonder Series A preferred stock into EyeWonder common stock requires the affirmative vote of the holders of at least a majority of the outstanding shares of EyeWonder Series A preferred stock. Because approval of this proposal is based on the affirmative vote of a majority of the outstanding shares of EyeWonder Series A preferred stock, the failure of an EyeWonder Series A preferred stockholder to vote or an EyeWonder Series A preferred stockholder’s abstention will have the same effect as a vote against the proposal. However, the failure of an EyeWonder common stockholder or Series B preferred stockholder to vote, or an EyeWonder common stockholder’s or Series B preferred stockholder’s abstention, will have no effect on this proposal.

Approval of the proposal to convert the outstanding shares of EyeWonder Series B preferred stock into EyeWonder common stock requires the affirmative vote of the holders of at least a majority of the outstanding shares of EyeWonder Series B preferred stock. Because approval of this proposal is based on the affirmative vote of a majority of the outstanding shares of EyeWonder Series B preferred stock, the failure of an EyeWonder Series B preferred stockholder to vote or an EyeWonder Series B preferred stockholder’s abstention will have the same effect as a vote against the proposal. However, the failure of an EyeWonder common stockholder or Series A preferred stockholder to vote, or an EyeWonder common stockholder’s or Series A preferred stockholder’s abstention, will have no effect on this proposal.

Approval of the adjournment proposal requires the affirmative vote of the holders of a majority of the shares of EyeWonder common and preferred stock entitled to vote at the special meeting and present in person or

represented by proxy. Because approval of this proposal requires the affirmative vote of a majority of the outstanding shares of EyeWonder common and preferred stock present in person or by proxy and entitled to vote at the special meeting, abstentions will have the same effect as a vote against this proposal. However, the failure to vote, either by proxy or in person, will have no effect on the adjournment proposal.

As of the record date, directors and executive officers of EyeWonder, and their affiliates, had the right to vote [            ] shares of EyeWonder’s common stock and preferred stock, on an as-converted basis, or [    ]% of the outstanding EyeWonder common stock and preferred stock, on an as-converted basis, at that date. EyeWonder currently expects that each of these individuals will vote their shares of EyeWonder common stock and preferred stock, if any, in favor of the proposals to be presented at the special meeting.

Recommendations to Stockholders

To Limelight Stockholders (Page 64). The Limelight board of directors has unanimously determined and believes that the issuance of shares of Limelight common stock in the first merger is advisable to, and in the best interests of, Limelight and its stockholders. The Limelight board of directors unanimously recommends that the holders of Limelight common stock vote “FOR” Proposal No. 1 to approve the issuance of shares of Limelight common stock in the merger, and “FOR” Proposal No. 2 to adjourn the Limelight special meeting, if necessary, if a quorum is present, to solicit additional proxies if there are not sufficient votes in favor of Proposal No. 1.

To EyeWonder Stockholders (Page 69). The EyeWonder board of directors has unanimously determined and believes that the merger is advisable and fair to, and in the best interests of, EyeWonder and its stockholders. The EyeWonder board of directors unanimously recommends that the holders of EyeWonder stock vote “FOR” Proposal No. 1 to adopt the merger agreement, “FOR” Proposal No. 2 to convert the Series A preferred stock into common stock and “FOR” Proposal No. 3 to convert the Series B preferred stock into common stock. The EyeWonder board of directors also recommends that EyeWonder stockholders vote “FOR” Proposal No. 4 to adjourn the EyeWonder special meeting, if necessary, if a quorum is present, to solicit additional proxies if there are not sufficient votes in favor of Proposal No. 1.

General Description of the Merger (page 71)

The merger agreement contemplates that Elvis Merger Sub One Corporation, a direct, wholly owned subsidiary of Limelight, will merge with and into EyeWonder, with EyeWonder continuing as the interim surviving entity, and, immediately thereafter, EyeWonder will merge with and into Elvis Merger Sub Two LLC, a second direct, wholly owned subsidiary of Limelight, with such subsidiary continuing as the final surviving entity. The shares of Limelight common stock to be issued to EyeWonder securityholders in the first step merger are expected to represent approximately 13% of the outstanding shares of Limelight common stock immediately following the completion of the merger, which percentage is based upon the number of outstanding shares of Limelight common stock on March 1, 2010.

Reasons for the Merger (page 74)

The principal factors and risks considered by the Limelight board of directors in reaching its conclusion to approve the merger and to recommend that the Limelight stockholders approve the issuance of shares of Limelight common stock in the first merger, and the principal factors and risks considered by the EyeWonder board of directors in reaching its conclusion to approve the merger and to recommend that the EyeWonder stockholders adopt the merger agreement are discussed, respectively, in the sections entitled “Limelight Proposal No. 1 and EyeWonder Proposal No. 1 – The Merger — Reasons for the Merger — Limelight’s Reasons for the Merger” on page 74 and “Limelight Proposal No. 1 and EyeWonder Proposal No. 1 – The Merger — Reasons for the Merger — EyeWonder’s Reasons for the Merger” on page 76.

Opinion of Limelight’s Financial Advisor (page 80)

In connection with the merger, Jefferies & Company, Inc., or Jefferies, Limelight’s financial advisor, delivered to the Limelight board of directors a written opinion, dated December 18, 2009, as to the fairness, from a financial point of view and as of the date of the opinion, of the consideration (as defined in the opinion) to be paid by Limelight pursuant to the merger agreement. The full text of the written opinion, dated December 18, 2009, of Jefferies, which describes, among other things, the assumptions made, procedures followed, factors considered and limitations on the review undertaken, is attached as Annex F to this proxy statement/prospectus and is incorporated by reference in its entirety into this proxy statement/prospectus. Holders of Limelight common stock are encouraged to read the opinion carefully in its entirety. Jefferies provided its opinion to the Limelight board of directors for the benefit and use of the Limelight board of directors in connection with and for purposes of its evaluation of the merger consideration from a financial point of view. Jefferies’ opinion does not address any other aspect of the merger and does not constitute a recommendation to any stockholder, or any other person, including any stockholder of EyeWonder, as to how to vote or act in connection with the proposed mergers or any matter related thereto.

Interests of Limelight’s Executive Officers and Directors in the Merger (page 86)

On February 8, 2010, the Compensation Committee of Limelight’s Board of Directors granted Jeffrey W. Lunsford, Limelight’s President, Chief Executive Officer and Chairman, 300,000 restricted stock units that become eligible for vesting based on certain financial performance criteria of the EyeWonder business unit for the calendar year ending December 31, 2010. For more information, please see “Limelight Proposal No. 1 and EyeWonder Proposal No. 1 — The Merger — Interests of Limelight’s Executive Officers and Directors in the Merger” on page 86.

Interests of EyeWonder’s Executive Officers and Directors in the Merger (page 87)

EyeWonder’s executive officers and directors have interests in the merger that are different from those of other EyeWonder stockholders. As described below, certain executive officers and directors of EyeWonder will be entitled to additional benefits as a result of the completion of the merger or upon certain events following the completion of the merger. As of the record date, all directors and executive officers of EyeWonder, together with their affiliates, beneficially owned approximately [    ]% of the outstanding shares of EyeWonder common stock.

Each of John J. Vincent, Jerome F. Connell, Jr., Patrick McClellen and Michael Rosner are party to employment agreements with EyeWonder that provide for severance benefits in the event their employment is terminated by their employer for any reason other than cause (as such term is defined in the respective employment agreement), or if their employment terminates due to disability (as such term is defined in the respective employment agreement). In addition, following the merger, Mr. Vincent, the current Chief Executive Officer and Chairman of EyeWonder, will be the Chief Executive Officer of the surviving entity, which will operate as a wholly owned subsidiary of Limelight. Limelight anticipates that Thomas Falk, a current member of EyeWonder’s board of directors, will provide ongoing consulting services to Limelight following the merger including providing assistance in integration efforts and recruiting. Effective upon the closing of the merger, Mr. Vincent has entered into an employment agreement with Limelight to serve as Chief Executive Officer of the surviving entity, Mr. Falk and Limelight intend to enter into a consulting agreement, and certain other officers may also enter into offer letters or employment agreements for employment with Limelight. Two individuals from the current EyeWonder board of directors, Mr. Vincent and Mr. Falk, will also be appointed to the Limelight board of directors. Limelight has also agreed to, and agreed to cause the surviving entity in the merger to, indemnify and hold harmless each present and former officer, director and employee of EyeWonder and its subsidiaries, or any individual who was serving at the request of EyeWonder as an officer, director or employee of another enterprise, from liability for matters arising in their capacities as such at or prior to the completion of the merger to the fullest extent provided by EyeWonder’s certificate of incorporation and bylaws. Limelight has

agreed that, for six (6) years after completion of the merger, Limelight and the surviving entity will cause to be maintained the existing policy of EyeWonder’s directors’ and officers’ liability insurance covering claims that occurred at or prior to completion of the merger.

In addition, following the merger, Limelight will (i) allocate and grant, in its sole discretion after consultation with Mr. Vincent, options to acquire 1,000,000 shares of Limelight common stock among the employees of EyeWonder who continue as employees of the surviving entity, (ii) establish an employee retention plan for continuing employees and (iii) issue 1,000,000 restricted stock units to the continuing employees subject to forfeiture for failure to satisfy certain performance metrics. Limelight will also either continue (or cause the surviving entity to continue) to maintain the EyeWonder employee benefit plans or arrange for each participant in the EyeWonder employee benefit plans to participate in substantially similar plans or arrangements of Limelight (or its applicable subsidiary), or, a combination of the foregoing so that participants will have benefits substantially similar in the aggregate to benefits provided to similarly situated employees of Limelight and at least equivalent to the benefits provided by EyeWonder immediately prior to the merger. In addition, except as may be required by law, for a period of one (1) year following the merger, continuing employees will receive base and salary compensation (excluding any equity based compensation) that is no less than the compensation received by such employees immediately prior to the merger. For more information, please see “Limelight Proposal No. 1 and EyeWonder Proposal No. 1 – The Merger — Interests of EyeWonder’s Executive Officers and Directors in the Merger” on page 87.

Appraisal Rights (page 89)

Under the Delaware General Corporation Law, referred to as the DGCL, holders of EyeWonder capital stock who do not vote for the approval of the merger proposal have the right to seek appraisal of the fair value of their shares as determined by the Delaware Court of Chancery if the merger is completed, but only if they comply with all requirements of Delaware law, which are summarized in this proxy statement/prospectus in the section entitled “Limelight Proposal No. 1 and EyeWonder Proposal No. 1—The Merger—Appraisal Rights” on page 89. This appraisal amount could be more than, the same as, or less than the amount an EyeWonder stockholder would be entitled to receive under the merger agreement. Any holder of EyeWonder capital stock intending to exercise appraisal rights, among other things, must submit a written demand for appraisal to EyeWonder prior to the vote on the approval of the merger proposal and must not vote or otherwise submit a proxy in favor of approval of the merger proposal. Failure to follow exactly the procedures specified under Delaware law will result in the loss of appraisal rights. Because of the complexity of the Delaware law relating to appraisal rights, if you are considering exercising your appraisal right, EyeWonder encourages you to seek the advice of your own legal counsel.

A copy of Section 262 of the DGCL is also included as Annex E to this proxy statement/prospectus.

Regulatory Approvals Required for the Merger (page 92)

Limelight and EyeWonder have agreed to use commercially reasonable efforts to obtain as promptly as practicable all regulatory approvals that are required to complete the transactions contemplated in the merger agreement. This includes filing all required notices to governmental authorities, including the required filings with the U.S. Department of Justice, or DOJ, and the Federal Trade Commission, or FTC, pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, referred to herein as the HSR Act. Limelight and EyeWonder filed necessary notices with the DOJ and the FTC in accordance with the HSR Act on January 25, 2010. On January 29, 2010, the Premerger Notification Office of the FTC informed the parties that early termination of the statutory waiting period had been granted.

Limelight must also comply with applicable federal and state securities laws and the rules and regulations of The Nasdaq Stock Market, Inc. in connection with the issuance of shares of Limelight common stock in the merger and the filing of this proxy statement/prospectus with the SEC.

Restrictions on Resales (page 92)

The shares of Limelight common stock to be issued to EyeWonder securityholders in the merger will be registered under the Securities Act of 1933 and, except as described below, may be freely traded without restriction. Pursuant to the merger agreement, certain principal stockholders of EyeWonder have entered into a restriction agreement with Limelight and may only dispose of their shares of Limelight common stock acquired in the merger in accordance with the terms of the restriction agreement. Generally, the restrictions lapse ratably over a twelve month period after the closing of the merger, subject to certain exceptions.

The Merger Agreement

Merger Consideration (page 93). Under the terms of the merger agreement, the holders of shares of EyeWonder capital stock outstanding at the completion of the merger will receive, in the aggregate, $62 million in cash, subject to certain adjustments, and 12,740,000 shares of Limelight common stock. The amount of cash and stock payable to the EyeWonder securityholders at closing is subject to a number of factors which we summarize below that will not be known with certainty until after the closing.

The $62 million cash portion of the aggregate merger consideration will be adjusted upward by the amount of EyeWonder’s cash and cash equivalents as of the closing and the amount by which its working capital exceeds $8.3 million at closing, and downward by the amount of EyeWonder’s debt outstanding at closing, EyeWonder’s transaction costs not paid prior to closing, and the amount by which EyeWonder’s working capital is less than $8.3 million at closing. EyeWonder currently estimates that the adjustments will reduce the cash portion of the merger consideration by approximately $11.6325 million, resulting in an estimated $50.3675 million of cash payable to the EyeWonder securityholders at the closing, or approximately $2.1090 per share of EyeWonder common stock based on there being an estimated 23,882,275 shares of EyeWonder common stock outstanding as of the closing and after giving effect to the exercise or conversion of all outstanding stock options and warrants. EyeWonder estimates that the $62 million cash portion of the aggregate merger consideration will be adjusted upward by a total of approximately $775,000, which consists of $275,000, the estimated amount of EyeWonder’s cash and cash equivalents as of the closing, and $500,000, the estimated amount by which EyeWonder’s working capital will exceed $8.3 million at closing. EyeWonder estimates that the cash portion of the aggregate merger consideration will be adjusted downward by a total of approximately $12.4075 million, which consists of $12.3075 million, the estimated amount of EyeWonder’s debt outstanding as of the closing, and $100,000, the estimated amount of EyeWonder’s transaction costs not paid prior to closing, resulting in a net downward adjustment to the $62 million cash portion of the aggregate merger consideration of $11.6325 million. These amounts are estimates only and are subject to change under certain circumstances as described above and as set forth more fully in the merger agreement. The merger agreement does not provide for a maximum cap or other limitation on the amount of such adjustments to the cash portion of the aggregate merger consideration. The actual consideration EyeWonder securityholders receive in exchange for their EyeWonder stock may be more, less or the same as these estimates. The following table shows how the amount of cash payable at closing could vary if the actual adjustments are 10% higher or 10% lower than our current estimates.

EyeWonder securityholders will also be entitled to receive as part of the merger consideration an aggregate of 12,740,000 shares of Limelight common stock, or approximately 0.5335 shares of Limelight common stock for

each share of EyeWonder common stock they hold. We currently estimate that 3,013,699 of these shares, or 0.1262 shares for each share of EyeWonder common stock outstanding as of the closing, will be placed in escrow pursuant to the merger agreement and not delivered until after the end of the escrow period on June 28, 2011, subject to any indemnification claims made by Limelight under the merger agreement. Accordingly, at closing, EyeWonder securityholders will receive approximately 0.4073 shares of Limelight common stock for each share of EyeWonder common stock they hold upon completion of the merger. The following table shows the estimated number of shares of Limelight common stock that will be issuable to the EyeWonder securityholders for each share of EyeWonder common stock held at the completion of the merger:

EyeWonder does not anticipate that any indemnification claims would be made against the escrowed shares, but it is not possible to predict with any certainty whether any such claims will be made. If Limelight common stock is used to satisfy indemnification claims, the merger agreement provides for such shares to be valued at the fixed value of $3.75 per share. The following table shows, for illustration purposes only, how many shares of Limelight common stock would be issuable to the EyeWonder securityholders at the end of the escrow period if there are no such claims made, and if claims in the amount of $2.5 million, $5.0 million and $7.5 million are made:

EyeWonder securityholders may also receive up to an aggregate amount of 4,774,000 shares of Limelight common stock and approximately $292,000 after the closing of the merger if certain performance metrics are satisfied. Of these shares, a maximum of 2,000,000 shares, or 0.0837 shares of Limelight common stock per share of EyeWonder stock outstanding, will be issuable based on EyeWonder’s revenues for calendar year 2010, provided that such revenues are at least $49,500,000. A maximum of 2,000,000 shares, or 0.0837 shares of Limelight common stock per share of EyeWonder stock outstanding, will be issuable based on EyeWonder’s revenues for calendar year 2010, provided that such EBITDA are at least $12,600,000. The following table shows, for illustration purposes only, how many shares of Limelight common stock would be issuable to the EyeWonder securityholders based on certain assumed levels of such revenues and EBITDA:

The remaining 774,000 shares of Limelight common stock and $292,000 of cash, or 0.0324 shares and $0.01 per share of EyeWonder stock outstanding, will be payable to the EyeWonder securityholders if the German company recently acquired by Limelight fails to achieve its financial milestones. Otherwise, such shares and cash will be paid to the former owners of that German company.

Treatment of EyeWonder Stock Options and Warrants (page 95). Each EyeWonder stock option that is outstanding and unexercised immediately prior to the completion of the first merger will be cancelled and will not be assumed or otherwise replaced by Limelight. Additionally, Limelight will not assume any EyeWonder warrants in connection with the merger. After the effective time of the merger, Limelight intends to instruct the exchange agent to pay any holder of EyeWonder options not exercised prior to the effective time the merger consideration into which the shares of EyeWonder stock underlying such options could have been converted as of immediately prior to the effective time had such options been exercised, less the exercise price of such options and less the pro rata portion of the escrow amount attributable to such shares of EyeWonder stock. At the effective time of the merger, each EyeWonder warrant then outstanding will be cancelled and converted without exercise into and represent the right to receive the merger consideration into which the shares of EyeWonder stock underlying such EyeWonder warrant have been converted, less the exercise price of such EyeWonder warrant and less the pro rata portion of the escrow amount attributable to such shares of EyeWonder stock.

Fractional Shares (page 94). Limelight will not issue any fractional shares of common stock in connection with the merger. Instead, each holder of EyeWonder capital stock who would otherwise be entitled to receive a fraction of a share of Limelight common stock will be entitled to receive cash without interest, in an amount equal to such fraction of a share of Limelight common stock on the trading day that is two (2) trading days immediately prior to the date the first-step merger is completed.

Limitation on the Solicitation, Negotiation and Discussion of Other Acquisition Proposals by EyeWonder (page 104). EyeWonder has agreed to a number of limitations with respect to soliciting, negotiating and discussing acquisition proposals involving persons other than Limelight, and to certain related matters.

Conditions to Complete the Merger (page 108). Completion of the merger is subject to obtaining the requisite votes of the Limelight and EyeWonder stockholders, and is subject to other customary closing conditions.

Termination of the Merger Agreement (page 111). Either Limelight or EyeWonder may terminate the merger agreement under certain circumstances, which would prevent the merger from being completed. In addition, EyeWonder may be required under certain circumstances to pay Limelight, and Limelight may be required under certain circumstances to pay EyeWonder, a termination fee of $3.5 million.

Escrow; Indemnification (page 110). Upon the completion of the merger, Limelight will deduct an amount of cash and Limelight common stock with an aggregate value of approximately $11,000,000 from the total merger consideration to be held in escrow for a certain period of time as security for indemnification claims under the merger agreement.

Voting Agreements (page 115)

As an inducement for Limelight to enter into the merger agreement, certain stockholders of EyeWonder entered into voting agreements covering the EyeWonder capital stock held by such stockholders with and in favor of Limelight dated as of December 21, 2009. Pursuant to the EyeWonder voting agreements, each such stockholder agreed, among other things, to vote all of such stockholder’s EyeWonder capital stock in favor of the adoption of the merger agreement and the transactions contemplated by the merger agreement and against any proposal that would compete with the merger agreement and the transactions contemplated by the merger agreement. The EyeWonder voting agreements terminate upon any termination of the merger agreement in accordance with its terms. The form of EyeWonder Voting Agreement is included as Annex B to this proxy statement/prospectus.

As an inducement for EyeWonder to enter into the merger agreement, certain stockholders of Limelight entered into voting agreements covering the Limelight capital stock held by such stockholders with and in favor of EyeWonder dated as of December 21, 2009. Pursuant to the Limelight voting agreements, each such

stockholder agreed, among other things, to vote all of such stockholder’s Limelight capital stock in favor of the issuance of Limelight common stock in the transactions contemplated by the merger agreement and against any proposal that would compete with the issuance of Limelight common stock in the transactions contemplated by the merger agreement. The Limelight voting agreements terminate upon any termination of the merger agreement in accordance with its terms. The form of Limelight Voting Agreement is included as Annex C to this proxy statement/prospectus.

Stock Purchase Agreements (page 117)

As an inducement for Limelight to enter into the merger agreement, certain stockholders of EyeWonder entered into stock purchase agreements with and in favor of Limelight dated as of December 21, 2009. Pursuant to the EyeWonder stock purchase agreements, each such stockholder agreed, among other things, to sell the EyeWonder securities beneficially held by such stockholder to Limelight under certain specified circumstances. The form of EyeWonder Stock Purchase Agreement is included as Annex D to this proxy statement/prospectus.

Accounting Treatment (page 139)

The merger will be accounted for as a purchase transaction by Limelight for financial reporting and accounting purposes under U.S. generally accepted accounting principles. The results of operations of EyeWonder will be included in the consolidated financial statements of Limelight following the completion of the merger.

Material U.S. Federal Income Tax Consequences of the Merger (page 140)

Limelight and EyeWonder each expect that the merger will qualify as a “reorganization” within the meaning of Section 368(a) of the Code. If the merger so qualifies as a reorganization, a U.S. holder of EyeWonder common stock receiving Limelight common stock and cash in exchange for EyeWonder common stock in the merger generally will recognize gain equal to the lesser of (i) the amount of cash received by the U.S. holder (excluding any cash received in lieu of fractional shares) and (ii) the excess of the “amount realized” by the U.S. holder over the U.S. holder’s tax basis in the EyeWonder common stock. The “amount realized” by the U.S. holder will equal the sum of the fair market value of the Limelight common stock and the amount of cash (including any cash received in lieu of fractional shares) received by the U.S. holder. Losses will not be permitted to be recognized. Realized gain or loss must be calculated separately for each identifiable block of shares (i.e., shares acquired at different times and prices) exchanged in the merger, and a loss realized on the exchange of one block cannot be used to offset a gain recognized on the exchange of another block.

Tax consequences of the merger are complex and depend on the facts of your individual situation. You should read the section entitled “Material U.S. Federal Income Tax Consequences of the Merger” beginning on page 140. Because individual circumstances may differ, you are urged to consult with your own tax advisor as to the tax consequences of the merger.

SELECTED HISTORICAL AND PRO FORMA FINANCIAL DATA

How We Prepared the Financial Statements

The following information is provided to aid you in your analysis of the financial aspects of the proposed acquisition by Limelight of EyeWonder. The information of Limelight was derived from the audited financial statements of Limelight for the years 2005 through 2009. The information of EyeWonder was derived from the audited financial statements of EyeWonder for the years 2005 through 2009. The information is only a summary and you should read it together with Limelight’s historical consolidated financial statements and related notes contained in its periodic reports and other information that Limelight has filed with the Securities and Exchange Commission, or the SEC, and the EyeWonder historical consolidated financial statements included in this proxy statement/prospectus. See “Where You Can Find More Information” on page 164.

Pro Forma Data

The unaudited pro forma combined consolidated condensed financial information is presented to give you a better picture of what Limelight’s and EyeWonder’s businesses might have looked like had they been combined on the dates indicated. The unaudited pro forma combined consolidated condensed statement of operations gives effect to the merger as if it had occurred on January 1, 2009. The unaudited pro forma combined consolidated condensed balance sheet gives effect to the merger as if it had occurred on December 31, 2009. You should not rely on the unaudited pro forma combined consolidated condensed financial information as being indicative of the historical results that we would have had or the future results that we will experience after the merger. See “Selected Unaudited Pro Forma Combined Consolidated Condensed Financial Data” on page 22.

Merger-Related Expenses

Limelight estimates that its merger-related fees and expenses, consisting primarily of fees and expenses of investment bankers, attorneys and accountants, and financial printing and other related charges, will be approximately $2.1 million. See Note 6 of unaudited pro forma combined consolidated condensed financial statements.

EyeWonder estimates that its merger-related fees and expenses, consisting primarily of fees and expenses of investment bankers, attorneys and accountants and financial printing and other related charges, will be approximately $0.7 million. See Note  6 of unaudited pro forma combined consolidated condensed financial statements.

Selected Historical Financial Data

You should read the selected financial data presented below with the financial statements of the respective companies and the notes thereto. The Limelight historical consolidated financial statements and footnotes and EyeWonder historical financial statements and footnotes are included in this proxy statement/prospectus. See “Where You Can Find More Information” on page 164.

Limelight Financial Data

The following selected historical financial data for, and as of the end of, each of the five years in the period ended December 31, 2009 have been derived from Limelight’s consolidated financial statements, which have been audited by Ernst & Young LLP, Limelight’s independent registered public accounting firm. Consolidated Financial Statements prior to 2006 are not included or incorporated herein by reference.

You should read this data together with the audited consolidated financial statements of Limelight, including the notes thereto, included in this proxy statement/prospectus. Please see the heading “Where You Can Find More Information” on page 164. Operating results for the year ended December 31, 2009 does not necessarily indicate the results that can be expected for the year ending December 31, 2010.

EyeWonder Financial Data

The following selected historical financial data for, and as of the end of, each of the five years in the period ended December 31, 2009 have been derived from EyeWonder’s consolidated financial statements, which have been audited by Grant Thornton, LLP, EyeWonder’s independent certified public accounting firm.

You should read this data together with the audited and unaudited consolidated financial statements of EyeWonder, including the notes thereto. Operating results for the year ended December 31, 2009 does not necessarily indicate the results that can be expected for the year ending December 31, 2010.

SELECTED UNAUDITED PRO FORMA COMBINED CONSOLIDATED CONDENSED FINANCIAL DATA

We are providing the following summary unaudited pro forma combined consolidated condensed financial information to provide you with a better picture of what the results of operations and the financial position of Limelight’s and EyeWonder’s businesses might have looked like had the acquisition occurred on January 1, 2009 for statement of operations purposes and as of December 31, 2009 for balance sheet purposes. This information is provided for illustrative purposes only and is not necessarily indicative of what our results of operations or financial position would have been if those transactions actually occurred on the dates assumed. In addition, this information is not necessarily indicative of what our future consolidated operating results or consolidated financial position will be. The “Unaudited Pro Forma Combined Consolidated Condensed Financial Statements” are located below beginning on page 143.