Document:

EX-10.20

 Exhibit 10.20 
 LIMELIGHT NETWORKS, INC. 
 ROBERT LENTO INTERIM CEO EMPLOYMENT AGREEMENT

 This Employment Agreement (the “Agreement”) is entered into as of November 8, 2012 (the “Signing
Date”), by and between Limelight Networks, Inc. (the “Company”) and Robert Lento (“Executive”). 
 1.
Duties and Scope of Employment. 
 (a) Positions and Duties. Effective November 8, 2012 (the “Effective
Date”), Executive will commence service as Special Advisor to the Board, and on November 26, 2012, Executive will commence service as the Company’s Interim Chief Executive Officer and Principal Executive Officer (“I-CEO”).
Executive will report to the Company’s Board of Directors (the “Board”). As of the Effective Date, Executive will render such business and professional services in the performance of his duties, consistent with Executive’s
position within the Company, as will reasonably be assigned to him by the Board. Unless extended by an instrument in writing signed by Executive and the Company, the term of this Agreement is for six (6) months following the Effective Date (the
“Employment Term”). Executive will be based in San Francisco, California but will spend such time in the Company’s Tempe, Arizona, Mountain View, California and San Diego, California offices, and will travel on Company business to
such other locations and for such periods, as may be necessary or appropriate to carry out his responsibilities or as may be directed by the Board. 
 (b) Obligations. During the Employment Term, Executive, except as provided in this Agreement, will devote Executive’s full business efforts and time to the Company and will use good faith
efforts to discharge Executive’s obligations under this Agreement to the best of Executive’s ability and in accordance with each of the Company’s written corporate guidance and ethics guidelines, conflict of interests policies, code
of conduct and other policies and procedures as the Company may adopt from time to time. For the duration of the Employment Term, Executive agrees not to actively engage in any other employment, occupation, or consulting activity for any direct or
indirect remuneration without the prior approval of the Board (which approval will not be unreasonably withheld); provided, however, that Executive may, without the approval of the Board, serve in any capacity with any civic, educational,
professional, industry or charitable organization, provided such services do not interfere with Executive’s performance of his obligations to Company, are disclosed in writing to the Company and are otherwise consistent with the Company’s
policies. Subject to prior approval of the Board or the Board’s Audit Committee (which approval will not be unreasonably withheld) Executive may also serve on the board(s) of for-profit business associations provided such participation does not
interfere with Executive’s performance of his obligations to the Company, are disclosed in writing to the Company, are consistent with the terms of Executive’s employment with the Company (including without limitation the restrictive
covenants in the Confidential Information Agreement, as defined in Section 12 below) and are consistent with the Company’s policies (including without limitation the Company’s Code of Business Conduct). Notwithstanding the foregoing,
the Company acknowledges that Executive currently serves on the board of directors for two entities: the Cincinnati Chamber of Commerce and Corrona, Inc. Executive’s service on those boards does not violate this Section 1(b). 

  
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 (c) No Conflicts. Executive hereby represents, warrants and covenants to the Company
that as of the Effective Date, Executive will not be a party to any contract, understanding, agreement or policy, written or otherwise, that will be breached by Executive’s entering into, or performing services under, this Agreement. Executive
further represents that he has disclosed to the Company in writing all threatened, pending, or actual claims against Executive, if any, of which he is aware, that are unresolved and still outstanding as of the Signing Date, and which, in each case,
relate to his employment with any previous employer or his membership on any board of directors. 
 (d) Other Entities.
Executive agrees to serve if appointed, without additional compensation, as an officer and director for each of the Company’s subsidiaries, partnerships, joint ventures, limited liability companies and other affiliates, including entities in
which the Company has a significant investment as determined by the Company. As used in this Agreement, the term “affiliates” will mean any entity controlled by, controlling, or under common control of the Company. 

2. At-Will Employment. Executive and the Company agree that Executive’s employment with the Company constitutes
“at-will” employment. Executive and the Company acknowledge that this employment relationship may be terminated at any time, upon written notice to the other party, with or without good cause or for any or no cause, at the option either of
the Company or Executive. However, as described in this Agreement, Executive may be entitled to continuation of Base Salary and benefits for a limited period of time depending upon the circumstances of Executive’s termination of employment.

 3. Compensation. 
 (a) Base Salary. Commencing with the Effective Date, the Company will pay Executive a monthly salary of $60,000 as compensation for his services (such monthly salary, as is then effective, to be
referred to herein as “Base Salary”). Executive’s Base Salary will be subject to review for period(s) beyond the Employment Term, if any. The Base Salary will be paid periodically in accordance with the Company’s normal payroll
practices and will be subject to the usual, required withholdings. 
 (b) Cash Bonus Incentive. Executive will not be
eligible to receive cash bonus incentives for service during the Employment Term. 
 (c) Equity Awards. 

(i) On the grant date set by the Board’s Compensation Committee (the “Committee”), the Company will issue to Executive
seventy-five thousand (75,000) Restricted Stock Units (“RSUs”) and two hundred fifty thousand non-qualified stock options (“Stock Options”) pursuant the Company’s 2007 Equity Incentive Plan (the “Plan). The RSUs
and the Stock Options will be granted under and subject to the terms, definitions and provisions of the Plan and the 

  
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Company’s form of equity award agreement. The exercise price of the Stock Options will be the fair market value of the Company’s common shares (as defined in the Plan) on the grant date
(which will be the date the grant is approved by the Committee or such later day as may be set by the Committee). The RSUs and the Stock Options may be referred to collectively as the Equity Awards. Subject to the provisions of Section 3(c)(ii)
below, the Equity Awards will vest on the six (6) month anniversary of the Effective Date, provided Executive continues to be a Service Provider through that vesting date. The Company will use commercially reasonable efforts to set the grant
date within five business days following the Effective Date. 
 (ii) If the Company consummates a Change of Control transaction
and Executive’s employment is terminated in connection with the Change of Control (or at any time during the Employment Term following a Change of Control), then 100% of Executive’s then outstanding unvested Equity Awards will vest
immediately. If the Company selects a permanent CEO to replace the Executive and Executive’s employment is terminated in connection with that selection then 100% of Executive’s then outstanding unvested Equity Awards will vest immediately.
For purposes of this Section, Executive’s termination is deemed “in connection with selection of a permanent CEO” if Executive’s employment is terminated without Cause, voluntarily resigns with Good Reason or dies and the
permanent CEO begins service within thirty (30) calendars days of Executive’s termination, resignation or death. If the Company terminates Executive’s employment without Cause or if Executive voluntarily resigns for Good Reason or if
Executive dies prior to the expiration of the Employment Term other than in connection with selection of a permanent CEO, then a portion of Executive’s then outstanding unvested Equity Awards will vest immediately that portion being the greater
of (i) fifty percent (50%) of the unvested Equity Awards, or (ii) the then outstanding unvested Equity Awards multiplied by a fraction the numerator of which is the actual number of calendar days of service completed (which shall
include Saturdays, Sundays and holidays) between the Effective Date and the date of termination of Executive’s employment and the denominator of which is 180. For purposes of this section a full month of service is calculated from the Effective
Date to the same date in subsequent months. If the Company terminates Executive’s employment for Cause or if Executive voluntarily resigns without Good Reason prior to expiration of the Employment Term, then no portion of Executive’s then
outstanding Equity Awards will vest and vesting will terminate immediately. Executive will be entitled to exercise any vested Stock Options until the first to occur of: (i) the date that is two years following the later of the (A) date
upon which such Stock Options vested or (B) the date upon which Executive ceases to be a Service Provider (as defined in the Plan), (ii) the applicable scheduled expiration date of such award (in the absence of any termination of
employment) as set forth in the award agreement, or (iii) the ten (10) year anniversary of the award’s original date of grant. For purposes of clarity, the term “expiration date” shall be the scheduled expiration of the
option agreement and not the period that Executive shall be entitled to exercise such option. Vesting of Equity Awards under this Section 3(c)(ii) is subject to compliance with the conditions in Section 8. 

(d) Attorneys’ Fees. Executive shall be entitled to receive reimbursement from the Company for the actual, reasonable
attorneys’ fees and costs incurred by him in connection with the review and negotiation of this Agreement not to exceed five thousand ($5,000) dollars. In the event of any dispute related to or based upon this Agreement or the Confidential
Information Agreement, and if Executive is the prevailing party then he shall be entitled to recover from the Company his reasonable attorneys’ fees and costs. 

  
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 4. Employee Benefits. 

(a) Generally. Executive will be eligible to participate in accordance with the terms of all Company employee benefit plans,
policies, arrangements and perquisites that are applicable to other senior officers of the Company and no less beneficial to Executive than those applicable to previous chief executive officers of the Company (excluding use of his personal
airplane), as such plans, policies, arrangements and perquisites may exist from time to time. 
 (b) Vacation. Executive
will be entitled to receive paid vacation in accordance with Company policy for other executive level officers, but with vacation accrual of not less than four (4) weeks per year, with not less than two (2) weeks during the initial six
month Employment Term. 
 5. Expenses. The Company will reimburse Executive for reasonable travel (including business or
first class airfare), entertainment and other business expenses, including professional association fees, incurred by Executive in the furtherance of the performance of Executive’s duties hereunder. Executive is expected to travel frequently to
the Company’s Tempe, Arizona and San Francisco, California offices, and business travel expense shall include reasonable reimbursement for, or use of, an apartment in either the Phoenix/Tempe, Arizona or San Francisco Bay area and reasonable
moving expenses, if Executive is requested and agrees to relocate his residence, subject to limitations set by the Chairman of the Committee. All reimbursements to Executive by the Company pursuant to this Section 5 shall be in accordance with
the Company’s expense reimbursement policy as in effect from time to time. 
 6. Termination of Employment. In the
event Executive’s employment with the Company terminates for any reason, Executive will be entitled to any (a) unpaid Base Salary accrued up to the effective date of termination; (b) pay for accrued but unused vacation;
(c) benefits or compensation as provided under the terms of any employee benefit plans applicable to Executive; (d) unreimbursed business expenses required to be reimbursed to Executive; and (e) rights to indemnification Executive may
have under the Company’s Certificate of Incorporation, Bylaws, and the Indemnification Agreement as applicable. In addition, if the termination is by the Company without Cause or by the Executive for Good Reason, then, subject to compliance
with the conditions in Section 8, Executive will be entitled to the amounts and benefits specified in Section 7 and the vesting of Equity Awards as described in Section 3(c)(ii). 

7. Severance. 
 (a) Termination Without Cause or for Good Reason During the Employment Term. If Executive’s employment is terminated by the Company without Cause or by the Executive for Good Reason prior to
expiration of the Employment Term then, subject to Section 8, Executive will receive: (i) continued payment of Executive’s Base Salary (subject to applicable tax withholdings) for the remainder of the Employment Term, such amounts to
be paid in accordance 

  
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with the Company’s normal payroll policies; and (iii) reimbursement for premiums paid for continued health benefits for Executive (and any eligible dependents) under the Company’s
health plans until the earlier of (A) expiration of the Employment Term, payable when such premiums are due (provided Executive validly elects to continue coverage under the Consolidated Omnibus Budget Reconciliation Act (“COBRA”)),
or (B) the date upon which Executive and Executive’s eligible dependents become covered under similar plans. 
 (b)
Voluntary Termination without Good Reason or Termination for Cause. If Executive’s employment is terminated voluntarily without Good Reason or is terminated for Cause by the Company, then, except as provided in Section 6,
(i) all further vesting of Executive’s outstanding Equity Awards will terminate immediately; (ii) all payments of compensation by the Company to Executive hereunder will terminate immediately. 

8. Conditions to Receipt of Severance: No Duty to Mitigate. 

(a) Separation Agreement and Release of Claims. The receipt of any Base Salary continuation or other benefits pursuant to
Section 7 and vesting of Equity Awards pursuant to Section 3(c)(ii) will be subject to Executive signing and not revoking a separation agreement and release of claims in a form acceptable to the Company and provided that such release of
claims becomes effective and irrevocable no later than sixty (60) days following the termination date (such deadline, the “Release Deadline”). The Company shall deliver such form to Executive within five (5) business days after
the date of termination. No severance or other benefits pursuant to Section 7 will be paid or provided until the separation agreement and release of claims becomes effective and irrevocable. If the separation agreement and release of claims
does not become effective by the Release Deadline, Executive will forfeit any rights to severance or benefits under this Agreement. 
 (b) Non-solicitation and Non-competition. The receipt of any severance or other benefits pursuant to Section 7 is subject to Executive agreeing that during the Employment Term and for twelve
(12) ) months thereafter, Executive will comply with all of the restrictive covenants contained in the Confidential Information Agreement (as defined in Section 12 below), including without limitation, the non-compete, non-solicitation of
employees and non-solicitation of customers covenants contained in Section 5 of the Confidential Information Agreement. 

(c) Nondisparagement. During the Employment Term and for twelve (12) months thereafter, Executive and the Company in its
official communications will not knowingly and materially disparage, criticize, or otherwise make any derogatory statements regarding the other. The Company will instruct its officers and directors to not knowingly and materially disparage,
criticize, or otherwise make any derogatory statements regarding Executive. Notwithstanding the foregoing, nothing contained in this agreement will be deemed to restrict Executive, the Company or any of the Company’s current or former officers
and/or directors from providing factual information to any governmental or regulatory agency (or in any way limit the content of any such information) to the extent they are requested or required to provide such information pursuant to applicable
order, subpoena, law or regulation. 

  
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 (d) Other Requirements. Executive’s receipt of payments pursuant to
Section 7 will be subject to Executive continuing to comply with the terms of the Confidential Information Agreement and the provisions of this Section 8. 
 (e) No Duty to Mitigate. Executive will not be required to mitigate the amount of any payment contemplated by this Agreement, nor will any earnings that Executive may receive from any other source
reduce any such payment. 
 9. Excise Tax. In the event that the benefits provided for in this Agreement constitute
“parachute payments” within the meaning of Section 280G of the Internal Revenue Code of 1986, as amended (the “Code”) and will be subject to the excise tax imposed by Section 4999 of the Code (the “Excise
Tax”), then Executive’s severance benefits payable under the terms of this Agreement will be either (a) delivered in full, or (b) delivered as to such lesser extent which would result in no portion of such severance benefits
being subject to the Excise Tax, whichever of the foregoing amounts, taking into account the applicable federal, state and local income taxes and the Excise Tax, results in the receipt by Executive on an after-tax basis, of the greatest amount of
severance benefits. Any reduction in payments and/or benefits required by this Section 9 will occur in the following order: (1) reduction of cash payments; (2) reduction of vesting acceleration of equity awards; and
(3) reduction of other benefits paid or provided to Executive. In the event that acceleration of vesting of equity awards is to be reduced, such acceleration of vesting will be cancelled in the reverse order of the date of grant for
Executive’s equity awards. If two or more equity awards are granted on the same date, each award will be reduced on a pro-rata basis. 
 10. Definitions. 
 (a) Cause. For purposes of this Agreement,
“Cause” will mean any of the following events, as determined in good faith by the Board: 
 (i) Acts or omissions
constituting gross negligence, recklessness or willful misconduct on the part of Executive with respect to Executive’s obligations under this Agreement or otherwise relating to the business of the Company, or failure or refusal, after written
notice thereof from the Chairman of the Board and an opportunity to cure of at least 10 business days, to carry out lawful directions from the Board with respect to Executive’s obligations under this Agreement or otherwise relating to the
business of the Company; 
 (ii) Any act of personal dishonesty taken by Executive in connection with his responsibilities as
an employee of the Company with the intention or reasonable expectation that such action may result in the substantial personal enrichment of Executive; 
 (iii) Executive’s conviction of, or plea of nolo contendere to, a felony that the Board reasonably believes has had or will have a material detrimental effect on the Company’s reputation or
business; 
 (iv) A breach of any fiduciary duty owed to the Company by Executive that has a material detrimental effect on the
Company’s reputation or business; 

  
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 (v) Executive being found liable in any Securities and Exchange Commission or other civil
or criminal securities law action or entering any cease and desist order with respect to such action (regardless of whether or not Executive admits or denies liability); 
 (vi) Executive (A) obstructing or impeding; (B) endeavoring to obstruct, impede or improperly influence, or (C) failing to materially cooperate with, any investigation authorized by the
Board or any governmental or self-regulatory entity (an “Investigation”). However, Executive’s failure to waive attorney-client privilege relating to communications with Executive’s own attorney in connection with an
Investigation will not constitute “Cause”; 
 (vii) Executive’s disqualification or bar by any governmental or
self-regulatory authority from serving in the capacity contemplated by this Agreement or Executive’s loss of any governmental or self-regulatory license that is reasonably necessary for Executive to perform his responsibilities to the Company
under this Agreement, if (A) the disqualification, bar or loss continues for more than thirty (30) days, and (B) during that period the Company uses its good faith efforts to cause the disqualification or bar to be lifted or the
license replaced. While any disqualification, bar or loss continues during Executive’s employment, Executive will serve in the capacity contemplated by this Agreement to whatever extent legally permissible and, if Executive’s employment is
not permissible, Executive will be placed on leave (which will be paid to the extent legally permissible). 
 (b) Change of
Control. For purposes of this Agreement, “Change of Control” will mean the occurrence of any of the following events: 
 (i) The consummation by the Company of a merger or consolidation of the Company with any other corporation, other than a merger or consolidation which would result in the voting securities of the Company
outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity) more than 50% of the total voting power represented by the voting securities of the
Company or such surviving entity outstanding immediately after such merger or consolidation; 
 (ii) The approval by the
stockholders of the Company, or if stockholder approval is not required, approval by the Board, of a plan of complete liquidation of the Company or an agreement for the sale or disposition by the Company of all or substantially all of the
Company’s assets; or 
 (iii) Any “person” (as such term is used in Sections 13(d) and 14(d) of the Securities
Exchange Act of 1934, as amended), other than Goldman Sachs and its related funds and entities, becoming the “beneficial owner” (as defined in Rule 13d-3 under said Act), directly or indirectly, of securities of the Company representing
50% or more of the total voting power represented by the Company’s then outstanding voting securities. 
 (c)
Disability. For purposes of this Agreement, “Disability” will mean Executive’s absence from his responsibilities with the Company on a full-time basis for 120 calendar days in any consecutive twelve (12) month period as a
result of Executive’s mental or physical illness or injury. 

  
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 (d) In Connection with a Change of Control. For purposes of this Agreement, a
termination of Executive’s employment with the Company is “in Connection with a Change of Control” if Executive’s employment is terminated within three (3) months prior to the execution of an agreement that results in a
Change of Control or three (3) months following a Change of Control. 
 (e) Good Reason. For purposes of this
Agreement, “Good Reason” means the following: 
 (i) A reduction in the Executive’s Base Salary; 

(ii) The material reduction without his consent of the Executive’s title, authority, duties, or responsibilities from those in
effect immediately prior to the reduction, or a material adverse change in the Executive’s reporting responsibilities, provided however a sale, separation or spin-off of a portion of the Company’s business operations provided the Company
remains a going concern and provided Executive’s duties, position and responsibilities with respect to the remaining business operations are not materially reduced will also not be considered a basis for Good Reason resignation; 

(iii) Any material breach by the Company of any other material provision of this Agreement (including but not limited to the place of
performance as specified in Section 1(a)) that is not cured following notice and a reasonable cure period as provided below; or 
 (iv) A failure by the Company to require any successor entity to the Company specifically to assume all of the Company’s obligations to the Executive under this Agreement. 

Executive will not resign for Good Reason without first providing the Company with written notice within ten (10) days of the event
that Executive believes constitutes “Good Reason” specifically identifying the acts or omissions constituting the grounds for Good Reason and a reasonable cure period of not less than thirty (30) days which may be waived in the
Company’s discretion. 
 11. Indemnification. Executive will be provided indemnification to the maximum extent
permitted by the Company’s Certificate of Incorporation, Bylaws and an Indemnification Agreement between Executive and Company of even date herewith (the “Indemnification Agreement”). Executive will be provided directors and officers
insurance coverage, on terms no less favorable than provided to any other Company executive officer or director. 
 12.
Confidential Information. Executive will execute the form of At-Will Employment, Confidential Information, Inventions Assignment and Arbitration Agreement, appended hereto as Exhibit A (the “Confidential Information
Agreement”). In the event of any inconsistency between the terms of this Agreement and the terms of the Confidential Information Agreement, this Agreement will prevail. 

  
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 13. Assignment. This Agreement will be binding upon and inure to the benefit of
(a) the heirs, executors and legal representatives of Executive upon Executive’s death, and (b) any successor of the Company. Any such successor of the Company will be deemed substituted for the Company under the terms of this
Agreement for all purposes. For this purpose, “successor” means any person, firm, corporation, or other business entity which at any time, whether by purchase, merger, or otherwise, directly or indirectly acquires all or substantially all
of the assets or business of the Company. None of the rights of Executive to receive any form of compensation payable pursuant to this Agreement may be assigned or transferred except by will or the laws of descent and distribution. Any other
attempted assignment, transfer, conveyance, or other disposition of Executive’s right to compensation or other benefits will be null and void. 
 14. Notices. All notices, requests, demands and other communications called for hereunder will be in writing and will be deemed given (a) on the date of delivery if delivered personally; or
(b) one (1) day after being sent overnight by a well-established commercial overnight service and addressed to the parties or their successors at the following addresses, or at such other addresses as the parties may later designate in
writing: 
 If to the Company: 
 222 South Mill Ave. , Suite 800 
 Tempe, Arizona 85281 

Attn: Senior Director of Human Resources 
 With Copy to: 
 222 South Mill Ave., Suite 800 

Tempe, Arizona 85281 
 Attn: Chief Legal Officer 
 If to Executive: 

at the last residential address known by the Company. 
 With a copy to 
 Michael D. DiSanto 

Dinsmore & Shohl LLP 
 255 E. Fifth Street 
 Suite 1900 

Cincinnati OH 45202 

  
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 15. Severability. If any provision hereof becomes or is declared by a court of
competent jurisdiction to be illegal, unenforceable, or void, this Agreement will continue in full force and effect without said provision. 
 16. Arbitration. The parties agree that any and all disputes arising out of the terms of this Agreement, Executive’s employment by the Company, Executive’s service as an officer or
director of the Company, or Executive’s compensation and benefits, their interpretation and any of the matters herein released, will be subject to binding arbitration in accordance with the terms of section 12 of the Confidential Information
Agreement. The Parties further agree that the prevailing party in any arbitration will be entitled to injunctive relief in any court of competent jurisdiction to enforce the arbitration award. The parties hereby agree to waive their right to have
any dispute between them resolved in a court of law by a judge or jury. This paragraph will not prevent either party from seeking injunctive relief (or any other provisional remedy) from any court having jurisdiction over the Parties and the
subject matter of their dispute relating to Executive’s obligations under this Agreement and the Confidential Information Agreement. 
 17. Integration. This Agreement, together with the Confidential Information Agreement and the forms of equity award agreements that describe Executive’s outstanding Equity Awards, represents
the entire agreement and understanding between the parties as to the subject matter herein and supersedes all prior or contemporaneous agreements whether written or oral. No waiver, alteration, or modification of any of the provisions of this
Agreement will be binding unless in a writing and signed by duly authorized representatives of the parties hereto. In entering into this Agreement, no party has relied on or made any representation, warranty, inducement, promise, or understanding
that is not in this Agreement. To the extent that any provisions of this Agreement conflict with those of any other agreement to be signed upon Executive’s hire, the terms in this Agreement will prevail. 

18. Waiver of Breach. The waiver of a breach of any term or provision of this Agreement, which must be in writing, will not
operate as or be construed to be a waiver of any other previous or subsequent breach of this Agreement. 
 19. Survival.
The Confidential Information Agreement and the Company’s and Executive’s responsibilities under Sections 6, 7, 8, 11 and 12 will survive the termination of this Agreement. 

20. Headings. All captions and Section headings used in this Agreement are for convenient reference only and do not form a
part of this Agreement. 
 21. Tax Withholding. All payments made pursuant to this Agreement will be subject to
withholding of applicable taxes. 
 22. Governing Law. This Agreement will be governed by the laws of the state of
Arizona without regard to its conflict of laws provisions. 
 23. Acknowledgment. Executive acknowledges that he has had
the opportunity to discuss this matter with and obtain advice from his private attorney, has had sufficient time to, and has carefully read and fully understands all the provisions of this Agreement, and is knowingly and voluntarily entering into
this Agreement. 

  
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 24. Code Section 409A. 

(a) Notwithstanding anything to the contrary in this Agreement, no severance payable to Executive, if any, pursuant to this Agreement,
when considered together with any other severance payments or separation benefits that are considered deferred compensation under Section 409A of the Code and the final regulations and any guidance promulgated thereunder (“Section
409A”) (together, the “Deferred Compensation Separation Benefits”) will be payable until Executive has a “separation from service” within the meaning of Section 409A. 

(b) Notwithstanding anything to the contrary in this Agreement, if Executive is a “specified employee” within the meaning of
Section 409A at the time of Executive’s termination (other than due to death), then the Deferred Compensation Separation Benefits that are payable within the first six (6) months following Executive’s separation from service,
will become payable on the first payroll date that occurs on or after the date six (6) months and one (1) day following the date of Executive’s separation from service. All subsequent Deferred Compensation Separation Benefits, if any,
will be payable in accordance with the payment schedule applicable to each payment or benefit. Notwithstanding anything herein to the contrary, if Executive dies following Executive’s separation from service but prior to the six (6) month
anniversary of the separation, then any payments delayed in accordance with this paragraph will be payable in a lump sum as soon as administratively practicable after the date of Executive’s death and all other Deferred Compensation Separation
Benefits will be payable in accordance with the payment schedule applicable to each payment or benefit. Each payment and benefit payable under this Agreement is intended to constitute separate payments for purposes of Section 1.409A-2(b)(2) of
the Treasury Regulations. 
 (c) Any amount paid under this Agreement that satisfies the requirements of the “short-term
deferral” rule set forth in Section 1.409A-1(b)(4) of the Treasury Regulations will not constitute Deferred Compensation Separation Benefits for purposes of clause (i) above. 

(d) Any amount paid under this Agreement that qualifies as a payment made as a result of an involuntary separation from service pursuant
to Section 1.409A-1(b)(9)(iii) of the Treasury Regulations that do not exceed the Section 409A Limit will not constitute Deferred Compensation Separation Benefits for purposes of clause (i) above. For purposes of this Agreement,
“Section 409A Limit” will mean the lesser of two (2) times: (i) Executive’s annualized compensation based upon the annual rate of pay paid to Executive during the Company’s taxable year preceding the Company’s
taxable year of Executive’s termination of employment as determined under Treasury Regulation 1.409A-1(b)(9)(iii)(A)(1) and any Internal Revenue Service guidance issued with respect thereto; or (ii) the maximum amount that may be taken
into account under a qualified plan pursuant to Section 401(a)(17) of the Code for the year in which Executive’s employment is terminated. 
 (e) The foregoing provisions are intended to comply with the requirements of Section 409A so that none of the severance payments and benefits to be provided hereunder will be subject to the
additional tax imposed under Section 409A, and any ambiguities herein will be interpreted to so comply. The Company and Executive agree to work together in good faith to consider amendments to this Agreement and to take such reasonable actions
which are necessary, appropriate or desirable to avoid imposition of any additional tax or income recognition prior to actual payment to Executive under Section 409A.” 

  
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 25. Counterparts. This Agreement may be executed in counterparts, and each
counterpart will have the same force and effect as an original and will constitute an effective, binding agreement on the part of each of the undersigned. 

  
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 IN WITNESS WHEREOF, each of the parties has executed this Agreement, in the case of the
Company by a duly authorized officer, as of the day and year written below. 
  

					
	COMPANY:	 		 	
			
	LIMELIGHT NETWORKS, INC.	 		 	
			
	 /s/ Doug Lindroth
	 		 	Date: November 13, 2012
	Doug Lindroth, CFO	 		 	
			
	EXECUTIVE:	 		 	
			
	 /s/ Robert Lento
	 		 	Date: November 13, 2012
	Robert Lento	 		 	

 [SIGNATURE PAGE TO LENTO EMPLOYMENT AGREEMENT] 

  
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 Exhibit A 

FORM OF CONFIDENTIAL INFORMATION AGREEMENT 

  
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 Exhibit 10.21 
 LIMELIGHT NETWORKS, INC. 
 ROBERT LENTO EMPLOYMENT AGREEMENT

 This Employment Agreement (the “Agreement”) is entered into as of January 22, 2013 (the “Signing
Date”), by and between Limelight Networks, Inc. (the “Company”) and Robert A. Lento (“Executive”). 

1. Duties and Scope of Employment. 
 (a) Positions and Duties. Executive is currently serving as the Company’s Interim CEO. Effective as of January 22, 2013 (the “Effective Date”), Executive will commence service
as the Company’s Chief Executive Officer (“CEO”). Executive will report to the Company’s Board of Directors (the “Board”). As of the Effective Date, Executive will render such business and professional services in the
performance of his duties, consistent with Executive’s position within the Company, as will reasonably be assigned to him by the Board. The period Executive is employed by the Company under this Agreement is referred to herein as the
“Employment Term.” Executive will be based in San Francisco, California but will spend such time in the Company’s Tempe, Arizona, Mountain View, California and San Diego, California offices, and will travel on Company business to such
other locations and for such periods, as may be necessary or appropriate to carry out his responsibilities or as may be directed by the Company’s Board. Executive will relocate his principal residence from Cincinnati, Ohio, to the San Francisco
Bay area not later than June 30, 2013. If Executive does not relocate to the San Francisco Bay area by June 30, 2013, then the Company may terminate his employment and this Agreement without payment of severance or other obligations or
liabilities other than those provided in Section 6 below. 
 (b) Obligations. During the Employment Term, Executive,
except as provided in this Agreement, will devote Executive’s full business efforts and time to the Company and will use good faith efforts to discharge Executive’s obligations under this Agreement to the best of Executive’s ability
and in accordance with each of the Company’s written corporate guidance and ethics guidelines, conflict of interests policies, code of conduct and other policies and procedures as the Company may adopt from time to time. For the duration of the
Employment Term, Executive agrees not to actively engage in any other employment, occupation, or consulting activity for any direct or indirect remuneration without the prior approval of the Chairman of the Board (which approval will not be
unreasonably withheld); provided, however, that Executive may, without the approval of the Chairman of the Board, serve in any capacity with any civic, educational, professional, industry or charitable organization, provided such services do not
interfere with Executive’s performance of his obligations to Company, are disclosed in writing to the Company and are otherwise consistent with the Company’s policies. Subject to prior approval of the Chairman of the Board and, in
appropriate cases (as determined by the Board) the prior approval of the Audit Committee of the Board (which approval will not be unreasonably withheld), Executive may also serve on the board(s) of for-profit business associations provided such
participation does not interfere with Executive’s performance of his obligations to the Company, are disclosed in writing to the 

  
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Company, are consistent with the terms of Executive’s employment with the Company (including without limitation the restrictive covenants in the Confidential Information Agreement, as
defined in Section 12 below) and are consistent with the Company’s policies (including without limitation the Company’s Code of Business Conduct). Notwithstanding the foregoing, the Company acknowledges that Executive currently serves
on the board of director for Corrona, Inc. Executive’s service on those boards does not violate this Section 1(b) and shall continue to be permitted for the length of the Employment Term. 

(c) No Conflicts. Executive hereby represents, warrants and covenants to the Company that as of the Effective Time, Executive will
not be a party to any contract, understanding, agreement or policy, written or otherwise, that will be breached by Executive’s entering into, or performing services under, this Agreement. Executive further represents that he has disclosed to
the Company in writing all threatened, pending, or actual claims that are unresolved and still outstanding as of the Signing Date, in each case, against Executive of which he is aware, if any, as a result of his employment with any previous employer
or his membership on any boards of directors. 
 (d) Other Entities. Executive agrees to serve if appointed, without
additional compensation, as an officer and director for each of the Company’s subsidiaries, partnerships, joint ventures, limited liability companies and other affiliates, including entities in which the Company has a significant investment as
determined by the Company. As used in this Agreement, the term “affiliates” will mean any entity controlled by, controlling, or under common control of the Company. 
 (e) Board Membership. At or prior to the first regular meeting of the Board, Executive will be appointed as a member of the Company’s Board. Subject to Board approval he will be appointed as a
Class II director and his initial term will expire at the Company’s annual meeting of the shareholders in 2015. 
 2.
At-Will Employment. Executive and the Company agree that Executive’s employment with the Company constitutes “at-will” employment. Executive and the Company acknowledge that this employment relationship may be terminated at any
time, upon written notice to the other party, with or without good cause or for any or no cause, at the option either of the Company or Executive. However, as described in this Agreement, Executive may be entitled to severance benefits depending
upon the circumstances of Executive’s termination of employment. 
 3. Compensation. 

(a) Base Salary. Commencing with the Effective Date, the Company will pay Executive an annual salary of four hundred seventy five
thousand ($475,000) as compensation for his services (such annual salary, as is then effective, to be referred to herein as “Base Salary”). Executive’s Base Salary will be subject to annual review. The Base Salary will be paid
periodically in accordance with the Company’s normal payroll practices and will be subject to the usual, required withholdings. 

  
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 (b) Annual Incentive. Executive will be eligible to receive
annual cash incentives payable for the achievement of performance goals established by the Board or by the Compensation Committee of the Board (the “Committee”). During calendar year 2013, Executive’s target annual incentive
(“Target Annual Incentive”) will be three hundred thousand ($300,000). The Target Annual Incentive for 2013 shall be prorated for the portion of calendar year 2013 during which Executive is an employee of the Company (Executive’s
service as Interim CEO during 2013 will be tacked to his service as CEO under this Agreement). The actual earned annual cash incentive, if any, payable to Executive for any performance period will depend upon the extent to which the applicable
performance goal(s) specified by the Committee are achieved. Any annual cash incentives earned pursuant to this Section 3(b) will be paid to Executive as soon as reasonably practicable following the date on which such annual cash incentives are
earned, but in no event will be paid later than March 15th of the year following the year in which such annual cash incentives are earned. 

(c) Equity Awards. 
 (i) On the grant date set by the Committee, the Company will issue to Executive seven hundred fifty thousand (750,000) Restricted Stock Units (“RSUs”) and two million
(2,000,000) non-qualified stock options (“Stock Options”) pursuant the Company’s 2007 Equity Incentive Plan (the “Plan). The RSUs and Stock Options will be granted under and subject to the terms, definitions and provisions
of the Plan and the Company’s form of equity award agreement. The exercise price of the Stock Options will be the fair market value of the Company’s common shares (as defined in the Plan) on the grant date (which will be the date the grant
is approved by the Committee or such later day as may be set by the Committee in accordance with the Company’s Equity Award Policy). One-quarter (1/4th) of the RSUs will vest on the first anniversary of the Effective Date, and one-sixteenth (1/16th) will vest on March 1, 2014 and an additional
one-sixteenth (1/16th) will vest on the first day of
each June, September, December and March thereafter until all of the RSUs have vested (four years), provided Executive continues to be a Service Provider (as defined in the Plan) through each such vesting date. One-quarter (1/4th) of the Stock Options will also vest on the first anniversary
of the Effective Date, and one-forty-eighth
(1/48th) of the Stock Options will vest on the
20th day of February, 2014 and on the 20th day of each month thereafter until all of the Stock Options have
vested (four years), provided Executive continues to be a service Provider through each such vesting date. Executive will not be eligible for additional Equity Awards before January, 2016. 

(ii) Executive may from time to time be issued stock options, RSUs or other equity awards under the Plan or a successor plan. Such
awards together with the equity awards issued pursuant to this Agreement may be referred to in this Agreement as “Equity Awards.” 
 (iii) In the event that the Company consummates a Change of Control transaction, 50% of Executive’s then outstanding unvested Equity Awards will vest immediately with such vesting being applied in
reverse order such that the Equity Awards with the latest vesting date first become non-forfeitable under this provision provided that there remain at least six (6) months of vesting term remain after application of the reverse order vesting.
In the event Executive’s employment is terminated in connection with a Change of Control, the balance of Executive’s then outstanding Equity Awards may vest as provided in Section 7(b) below. 

  
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 (d) Relocation Expense Reimbursement. The Company will reimburse Executive for
customary and reasonable relocation expenses actually incurred (subject to the reasonable approval of the Compensation Committee of the Board), including the cost of moving his family’s personal possessions and real estate brokerage fees paid
by Executive in connection with the sale of his current residence if he chooses to sell that property within the first two years of the Employment Term. 
 (e) Attorneys’ Fees. Executive shall be entitled to receive reimbursement from the Company for the actual, reasonable attorneys’ fees and costs incurred by him in connection with the
review and negotiation of this Agreement not to exceed five thousand ($5,000) dollars. 
 4. Employee Benefits.

 (a) Generally. Executive will be eligible to participate in accordance with the terms of all Company employee benefit
plans, policies, arrangements and perquisites that are applicable to other senior officers of the Company and no less beneficial to Executive than those applicable to previous chief executive officers of the Company (excluding use of his personal
airplane), as such plans, policies, arrangements and perquisites may exist from time to time. 
 (b) Vacation. Executive
will be entitled to receive paid annual vacation in accordance with Company policy for other vice president level officers, but with vacation accrual of not less than five (5) weeks per year. 

5. Expenses. The Company will reimburse Executive for reasonable travel, (including business or first class airfare),
entertainment and other business expenses, including professional association fees, incurred by Executive in the furtherance of the performance of Executive’s duties hereunder. Executive is expected to travel to the Company’s Tempe,
Arizona and other offices, as is reasonably practical in the Executive’s discretion. All reimbursements to Executive by the Company pursuant to this Section 5 shall be in accordance with the Company’s expense reimbursement policy as
in effect from time to time. 
 6. Termination of Employment. In the event Executive’s employment with the Company
terminates for any reason, Executive will be entitled to any (a) unpaid Base Salary accrued up to the effective date of termination; (b) unpaid, but earned and accrued annual incentive for any completed fiscal year as of his termination of
employment; (c) pay for accrued but unused vacation; (d) benefits or compensation as provided under the terms of any employee benefit and compensation agreements or plans applicable to Executive; (e) unreimbursed business expenses
required to be reimbursed to Executive; and (f) rights to indemnification Executive may have under the Company’s Certificate of Incorporation, Bylaws and this Agreement as applicable. In the event Executive’s employment with the
Company terminates for any reason (other than Cause), Executive will be entitled to exercise any outstanding vested stock options until the first to occur of: (i) the date that is two (2) years following the later of such termination of
employment or the date upon which 

  
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Executive ceases to be a Service Provider, (ii) the applicable scheduled expiration date of such award (in the absence of any termination of employment) as set forth in the award agreement,
or (iii) the ten (10) year anniversary of the award’s original date of grant. For purposes of clarity, the term “expiration date” shall be the scheduled expiration of the option agreement and not the period that Executive
shall be entitled to exercise such option. In addition, if the termination is by the Company without Cause or resignation by Executive for Good Reason, Executive will be entitled to the amounts and benefits specified in Section 7. 

7. Severance. 
 (a) Termination Without Cause or Resignation for Good Reason other than in Connection with a Change of Control. If Executive’s employment is terminated by the Company without Cause or
Executive terminates voluntarily for Good Reason and such termination is not in Connection with a Change of Control, then, subject to Section 8, Executive will receive: (i) continued payment of Executive’s Base Salary (subject to
applicable tax withholdings) for twelve (12) months, such amounts to be paid in accordance with the Company’s normal payroll policies; (ii) the actual earned cash incentive, if any, payable to Executive for the current year, pro-rated
to the date of termination, with such pro-rated amount to be calculated by multiplying the actually earned portion of the current year’s Target Annual Incentive by a fraction with a numerator equal to the number of days inclusive between the
start of the current calendar year and the date of termination and a denominator equal to 365, such amounts to be paid at the same time as similar bonus payments are made to the Company’s other executive officers, and (iii) reimbursement
for premiums paid for continued health benefits for Executive (and any eligible dependents) under the Company’s health plans until the earlier of (A) twelve (12) months, payable when such premiums are due (provided Executive validly
elects to continue coverage under the Consolidated Omnibus Budget Reconciliation Act (“COBRA”)), or (B) the date upon which Executive and Executive’s eligible dependents become covered under similar plans. For purposes of
clarity, the Compensation Committee of the Board shall determine, in good faith, the extent to which any cash incentive has been earned by Executive. 
 (b) Termination Without Cause or Resignation for Good Reason in Connection with a Change of Control. If Executive’s employment is terminated by the Company without Cause or Executive
terminates voluntarily for Good Reason and the termination is in Connection with a Change of Control, then, subject to Section 8, Executive will receive: (i) continued payment of Executive’s Base Salary for the year in which the
termination occurs (subject to applicable tax withholdings), for twelve (12) months, such amounts to be paid in accordance with the Company’s normal payroll policies; (ii) the payment in an amount equal to 100% of Executive’s
Target Annual Incentive for the year in which the termination occurs (subject to applicable tax withholdings), such amounts to be paid in accordance with the Company’s normal payroll policies over the course of twelve (12) months;
(iii) 100% of Executive’s then outstanding unvested Equity Awards will vest, and (iv) reimbursement for premiums paid for continued health benefits for Executive (and any eligible dependents) under the Company’s health plans
until the earlier of (A) twelve (12) months, payable when such premiums are due (provided Executive validly elects to continue coverage under COBRA), or (B) the date upon which Executive and Executive’s eligible dependents become
covered under similar plans. 

  
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 (c) Voluntary Termination or Termination for Cause. If Executive’s employment is
terminated voluntarily not for Good Reason or is terminated for Cause by the Company, then, except as provided in Section 6, (i) all further vesting of Executive’s outstanding Equity Awards will terminate immediately and stock options
shall be exercisable as provided in Section 6; (ii) all payments of compensation by the Company to Executive hereunder will terminate immediately, and (iii) Executive will be eligible for severance benefits only in accordance with the
Company’s then established plans. 
 (d) Termination as a Result of Death or Disability. In the event that Executive’s
employment is terminated due to death or Disability, twenty-five percent (25%) of Executive’s then unvested Equity Awards shall vest. 
 8. Conditions to Receipt of Severance: No Duty to Mitigate. 
 (a) Separation Agreement and Release of Claims. The receipt of any severance or other benefits pursuant to Section 7 will be subject to Executive signing and not revoking a separation
agreement and release of claims in a form acceptable to the Company and provided that such release of claims becomes effective and irrevocable no later than sixty (60) days following the termination date (such deadline, the “Release
Deadline”). The Company shall deliver such form to Executive within five (5) business days after the date of termination. No severance or other benefits pursuant to Section 7 will be paid or provided until the separation agreement and
release of claims becomes effective and irrevocable. If the separation agreement and release of claims does not become effective by the Release Deadline, Executive will forfeit any rights to severance or benefits under this Agreement. Any severance
payments or benefits under this Agreement that would be considered Deferred Compensation Severance Benefits (as defined in Section 24), will be paid on, or, in the case of installments, will not commence until, the sixtieth (60th) day following Executive’s “separation from
service”, or, if later, such time as required by Section 24. Any installment payments that would have been made to Executive during the sixty (60) day period immediately following Executive’s “separation from service”
but for the preceding sentence will be paid to Executive on the sixtieth (60th) day following Executive’s “separation from service” and the remaining payments will be made as provided in this Agreement. If Executive should die before all of the severance amounts
have been paid, such unpaid amounts will be paid in a lump-sum payment promptly following such event to Executive’s designated beneficiary, if living, or otherwise to the personal representative of Executive’s estate. 

(b) Non-solicitation and Non-competition. The receipt of any severance or other benefits pursuant to Section 7 is subject to
Executive agreeing that during the Employment Term and for twelve (12) months thereafter, Executive will comply with all of the restrictive covenants contained in the Confidential Information Agreement (as defined in Section 12 below),
including without limitation, the non-compete, non-solicitation of employees and non-solicitation of customers covenants contained in Section 5 of the Confidential Information Agreement. 

  
 -6-

 (c) Nondisparagement. During the Employment Term and for twelve (12) months
thereafter, Executive and the Company in its official communications will not knowingly and materially disparage, criticize, or otherwise make any derogatory statements regarding the other. The Company will instruct its officers and directors to not
knowingly and materially disparage, criticize, or otherwise make any derogatory statements regarding Executive. Notwithstanding the foregoing, nothing contained in this agreement will be deemed to restrict Executive, the Company or any of the
Company’s current or former officers and/or directors from providing factual information to any governmental or regulatory agency (or in any way limit the content of any such information) to the extent they are requested or required to provide
such information pursuant to applicable order, subpoena, law or regulation. 
 (d) Other Requirements. Executive’s
receipt of continued severance payments pursuant to Section 7 will be subject to Executive continuing to comply with the terms of the Confidential Information Agreement and the provisions of this Section 8. 

(e) No Duty to Mitigate. Executive will not be required to mitigate the amount of any payment contemplated by this Agreement, nor
will any earnings that Executive may receive from any other source reduce any such payment. 
 9. Excise Tax. In the
event that the benefits provided for in this Agreement constitute “parachute payments” within the meaning of Section 280G of the Internal Revenue Code of 1986, as amended (the “Code”) and will be subject to the excise tax
imposed by Section 4999 of the Code (the “Excise Tax”), then Executive’s severance benefits payable under the terms of this Agreement will be either (a) delivered in full, or (b) delivered as to such lesser extent which
would result in no portion of such severance benefits being subject to the Excise Tax, whichever of the foregoing amounts, taking into account the applicable federal, state and local income taxes and the Excise Tax, results in the receipt by
Executive on an after-tax basis, of the greatest amount of severance benefits. Any reduction in payments and/or benefits required by this Section 9 will occur in the following order: (1) reduction of cash payments; (2) reduction
of vesting acceleration of equity awards; and (3) reduction of other benefits paid or provided to Executive. In the event that acceleration of vesting of equity awards is to be reduced, such acceleration of vesting will be cancelled in the
reverse order of the date of grant for Executive’s equity awards. If two or more equity awards are granted on the same date, each award will be reduced on a pro-rata basis. 
 The accounting firm engaged by the Company for general audit purposes as of the day prior to the effective date of the change of control resulting in the parachute payment shall perform the foregoing
calculations. If the accounting firm so engaged by the Company is serving as accountant or auditor for the individual, entity or group effecting the change of control, the Company shall appoint a nationally recognized accounting firm to make the
determinations required hereunder. The Company shall bear all expenses with respect to the determinations by such accounting firm required to be made hereunder. The accounting firm engaged to make the determinations hereunder shall provide its
calculations, together with detailed supporting documentation, to the Company and Executive within fifteen (15) calendar days after the date on which Executive’s right to a payment is triggered (if requested at that time by the Company or
Executive) or such other time as requested by the Company or Executive. Any good faith determinations of the accounting firm made hereunder shall be final, binding and conclusive upon the Company and Executive. 

  
 -7-

 10. Definitions. 

(a) Cause. For purposes of this Agreement, “Cause” will mean: 

(i) Acts or omissions constituting gross negligence, recklessness or willful misconduct on the part of Executive with respect to
Executive’s obligations under this Agreement or otherwise relating to the business of the Company, or failure or refusal, after written notice thereof from the Chairman of the Board and an opportunity to cure of at least 10 business days, to
carry out lawful directions from the Board with respect to Executive’s obligations under this Agreement or otherwise relating to the business of the Company; 
 (ii) Any act of personal dishonesty taken by Executive in connection with his responsibilities as an employee of the Company with the intention or reasonable expectation that such action may result in the
substantial personal enrichment of Executive; 
 (iii) Executive’s conviction of, or plea of nolo contendere to, a felony
that the Board reasonably believes has had or will have a material detrimental effect on the Company’s reputation or business; 
 (iv) A breach of any fiduciary duty owed to the Company by Executive that has a material detrimental effect on the Company’s reputation or business; 

(v) Executive being found liable in any Securities and Exchange Commission or other civil or criminal securities law action or entering
any cease and desist order with respect to such action (regardless of whether or not Executive admits or denies liability); 

(vi) Executive (A) obstructing or impeding; (B) endeavoring to obstruct, impede or improperly influence, or (C) failing
to materially cooperate with, any investigation authorized by the Board or any governmental or self-regulatory entity (an “Investigation”). However, Executive’s failure to waive attorney-client privilege relating to communications
with Executive’s own attorney in connection with an Investigation will not constitute “Cause”; or 
 (vii)
Executive’s disqualification or bar by any governmental or self-regulatory authority from serving in the capacity contemplated by this Agreement or Executive’s loss of any governmental or self-regulatory license that is reasonably
necessary for Executive to perform his responsibilities to the Company under this Agreement, if (A) the disqualification, bar or loss continues for more than thirty (30) days, and (B) during that period the Company uses its good faith
efforts to cause the disqualification or bar to be lifted or the license replaced. While any disqualification, bar or loss continues during Executive’s employment, Executive will serve in the capacity contemplated by this Agreement to whatever
extent legally permissible and, if Executive’s employment is not permissible, Executive will be placed on leave (which will be paid to the extent legally permissible). 

  
 -8-

 (b) Change of Control. For purposes of this Agreement, “Change of Control”
will mean the occurrence of any of the following events: 
 (i) The consummation by the Company of a merger or consolidation of
the Company with any other corporation, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being
converted into voting securities of the surviving entity) more than 50% of the total voting power represented by the voting securities of the Company or such surviving entity outstanding immediately after such merger or consolidation; 

(ii) The approval by the stockholders of the Company, or if stockholder approval is not required, approval by the Board, of a plan of
complete liquidation of the Company or an agreement for the sale or disposition by the Company of all or substantially all of the Company’s assets; or 
 (iii) Any “person” (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended), other than Goldman Sachs and its related funds and entities, becoming
the “beneficial owner” (as defined in Rule 13d-3 under said Act), directly or indirectly, of securities of the Company representing 50% or more of the total voting power represented by the Company’s then outstanding voting securities.

 (c) Continuance Period. For purposes of this Agreement, “Continuance Period” will mean the period of time
beginning on the date of the termination of Executive’s employment and ending on the date on which Executive is no longer receiving Base Salary payments under Section 7. 

(d) Disability. For purposes of this Agreement, “Disability” will mean Executive’s absence from his
responsibilities with the Company on a full-time basis for 120 calendar days in any consecutive twelve (12) month period as a result of Executive’s mental or physical illness or injury. 

(e) In Connection with a Change of Control. For purposes of this Agreement, a termination of Executive’s employment with the
Company is “in Connection with a Change of Control” if Executive’s employment is terminated within three (3) months prior to the execution of an agreement that results in a Change of Control or twelve (12) months following a
Change of Control. 
 (f) Good Reason. For purposes of this Agreement, “Good Reason” means Executive’s
voluntary resignation of employment because of the existence of any of the following reasons and which reason(s) continue following the expiration of any cure period (as discussed below), without Executive’s written consent: 

(i) A substantial, material reduction without his consent of the Executive’s title, authority, duties, or responsibilities from
those in effect immediately prior to the reduction, or a material adverse change in the Executive’s reporting responsibilities, provided however a sale, 

  
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separation or spin-off of a portion of the Company’s business operations provided the Company remains a going concern and provided Executive’s duties, position and responsibilities with
respect to the remaining business operations are not materially reduced will also not be considered a basis for Good Reason resignation; 
 (ii) A material reduction in Executive’s cash compensation (either Base Salary, or Base Salary and Annual Incentive Target combined) as in effect immediately prior to such reduction. Notwithstanding
the foregoing, a one-time reduction that also is applied to other similarly situated executive officers of the Company and which one-time reduction reduces the cash compensation by a percentage reduction of 10% or less in the aggregate will not be
deemed material and will not constitute “Good Reason”; 
 (iii) A failure by the Company to require any successor
entity to the Company specifically to assume all of the Company’s obligations to the Executive under this Agreement; or 

(iv) A material breach by the Company (or its successor) of any material contractual obligation owed Executive pursuant to this
Agreement (including, without limitation, the failure of the Company to obtain the assumption of this Agreement by a successor) that is not cured following notice and a reasonable cure period as provided below. 

Executive will not resign for Good Reason without first providing the Company with written notice within thirty (30) days of the
event that Executive believes constitutes “Good Reason” specifically identifying the acts or omissions constituting the grounds for Good Reason and a reasonable cure period of not less than thirty (30) days. 

11. Indemnification. Subject to applicable law, Executive will be provided indemnification to the maximum extent permitted by the
Company’s Certificate of Incorporation, Bylaws and an Indemnification Agreement between Executive and Company of even date herewith (the “Indemnification Agreement”). Executive will be provided directors and officers insurance
coverage, on terms no less favorable than provided to any other Company executive officer or director. 
 12. Confidential
Information. Executive will execute or if previously executed hereby re-affirms the form of At-Will Employment, Confidential Information, Inventions Assignment and Arbitration Agreement, appended hereto as Exhibit A (the
“Confidential Information Agreement”). In the event of any inconsistency between the terms of this Agreement and the terms of the Confidential Information Agreement, this Agreement will prevail. 

13. Assignment. This Agreement will be binding upon and inure to the benefit of (a) the heirs, executors and legal
representatives of Executive upon Executive’s death, and (b) any successor of the Company. Any such successor of the Company will be deemed substituted for the Company under the terms of this Agreement for all purposes. For this purpose,
“successor” means any person, firm, corporation, or other business entity which at any time, whether by purchase, merger, or otherwise, directly or indirectly acquires all or substantially all of the assets or business of

  
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the Company. None of the rights of Executive to receive any form of compensation payable pursuant to this Agreement may be assigned or transferred except by will or the laws of descent and
distribution. Any other attempted assignment, transfer, conveyance, or other disposition of Executive’s right to compensation or other benefits will be null and void. This Section 13 will in no way prevent Executive from transferring any
vested property he owns. 
 14. Notices. All notices, requests, demands and other communications called for hereunder
will be in writing and will be deemed given (a) on the date of delivery if delivered personally; (b) one (1) day after being sent overnight by a well-established commercial overnight service, or (c) four (4) days after being
mailed by registered or certified mail, return receipt requested, prepaid and addressed to the parties or their successors at the following addresses, or at such other addresses as the parties may later designate in writing: 

If to the Company: 
 222 South Mill Ave., Suite 800 
 Tempe, Arizona 85281 

Attn: Senior Director of Human Resources 
 With Copy to: 
 222 South Mill Ave., Suite 800 

Tempe, Arizona 85281 
 Attn: Chief Legal Officer 
 If to Executive: 

at the last residential address known by the Company. 
 With a copy to 
 Michael D. DiSanto 

Dinsmore & Shohl LLP 
 255 E. Fifth Street 
 Suite 1900 

Cincinnati OH 45202 
 15. Severability. If any provision hereof becomes or is declared by a court of competent jurisdiction to be illegal, unenforceable, or void, this Agreement will continue in full force and effect
without said provision. 
 16. Arbitration. The parties agree that any and all disputes arising out of the terms of this
Agreement, Executive’s employment by the Company, Executive’s service as an officer or director of the Company, or Executive’s compensation and benefits, their interpretation and any of the matters herein released, will be subject to
binding arbitration in accordance with the terms of section 

  
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12 of the Confidential Information Agreement. The Parties further agree that the prevailing party in any arbitration will be entitled to injunctive relief in any court of competent jurisdiction
to enforce the arbitration award. The parties hereby agree to waive their right to have any dispute between them resolved in a court of law by a judge or jury. This paragraph will not prevent either party from seeking injunctive relief (or
any other provisional remedy) from any court having jurisdiction over the Parties and the subject matter of their dispute relating to Executive’s obligations under this Agreement and the Confidential Information Agreement. 

17. Integration and Effect on November 8, 2012 Interim CEO Agreement. The Company and Executive previously entered into an
Interim CEO Agreement dated November 8, 2012 (the “Interim Agreement”). Subject to the survival of certain rights and duties as described in this Section the interim Agreement is terminated as of the Effective Date of this Agreement.
Certain provisions of the Interim Agreement survive termination as provided in Section 19 of the Interim Agreement. The Equity Awards specified in Section 3(c) of the Interim Agreement will remain outstanding and continue to vest in
accordance with their terms and provided Executive remains a Service Provider through each such vesting date. This Agreement, together with the Confidential Information Agreement, the Indemnification Agreement between the Company and Executive and
the forms of equity award agreements that describe Executive’s outstanding Equity Awards, represents the entire agreement and understanding between the parties as to the subject matter herein and supersede all prior or contemporaneous
agreements, including the Interim Agreement, whether written or oral. No waiver, alteration, or modification of any of the provisions of this Agreement will be binding unless in a writing and signed by duly authorized representatives of the parties
hereto. In entering into this Agreement, no party has relied on or made any representation, warranty, inducement, promise, or understanding that is not in this Agreement. To the extent that any provisions of this Agreement conflict with those of any
other agreement to be signed upon Executive’s hire, the terms in this Agreement will prevail. 
 18. Waiver of
Breach. The waiver of a breach of any term or provision of this Agreement, which must be in writing, will not operate as or be construed to be a waiver of any other previous or subsequent breach of this Agreement. 

19. Survival. The Confidential Information Agreement and the Company’s and Executive’s responsibilities under Sections
6, 7, 8, 11 and 12 will survive the termination of this Agreement. 
 20. Headings. All captions and
Section headings used in this Agreement are for convenient reference only and do not form a part of this Agreement. 
 21.
Tax Withholding. All payments made pursuant to this Agreement will be subject to withholding of applicable taxes. 
 22.
Governing Law. This Agreement will be governed by the laws of the state of Arizona without regard to its conflict of laws provisions. 

  
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 23. Acknowledgment. Executive acknowledges that he has had the opportunity to discuss
this matter with and obtain advice from his private attorney, has had sufficient time to, and has carefully read and fully understands all the provisions of this Agreement, and is knowingly and voluntarily entering into this Agreement. 

24. Code Section 409A. 
 (a) Notwithstanding anything to the contrary in this Agreement, no severance payable to Executive, if any, pursuant to this Agreement, when considered together with any other severance payments or
separation benefits that are considered deferred compensation under Section 409A of the Code and the final regulations and any guidance promulgated thereunder (“Section 409A”) (together, the “Deferred Compensation Separation
Benefits”) will be payable until Executive has a “separation from service” within the meaning of Section 409A. 
 (b) Notwithstanding anything to the contrary in this Agreement, if Executive is a “specified employee” within the meaning of Section 409A at the time of Executive’s termination (other
than due to death), then the Deferred Compensation Separation Benefits that are payable within the first six (6) months following Executive’s separation from service, will become payable on the first payroll date that occurs on or after
the date six (6) months and one (1) day following the date of Executive’s separation from service. All subsequent Deferred Compensation Separation Benefits, if any, will be payable in accordance with the payment schedule applicable to
each payment or benefit. Notwithstanding anything herein to the contrary, if Executive dies following Executive’s separation from service but prior to the six (6) month anniversary of the separation, then any payments delayed in accordance
with this paragraph will be payable in a lump sum as soon as administratively practicable after the date of Executive’s death and all other Deferred Compensation Separation Benefits will be payable in accordance with the payment schedule
applicable to each payment or benefit. Each payment and benefit payable under this Agreement is intended to constitute separate payments for purposes of Section 1.409A-2(b)(2) of the Treasury Regulations. 

(c) Any amount paid under this Agreement that satisfies the requirements of the “short-term deferral” rule set forth in
Section 1.409A-1(b)(4) of the Treasury Regulations will not constitute Deferred Compensation Separation Benefits for purposes of clause (i) above. 
 (d) Any amount paid under this Agreement that qualifies as a payment made as a result of an involuntary separation from service pursuant to Section 1.409A-1(b)(9)(iii) of the Treasury Regulations
that do not exceed the Section 409A Limit will not constitute Deferred Compensation Separation Benefits for purposes of clause (i) above. For purposes of this Agreement, “Section 409A Limit” will mean the lesser of two
(2) times: (i) Executive’s annualized compensation based upon the annual rate of pay paid to Executive during the Company’s taxable year preceding the Company’s taxable year of Executive’s termination of employment as
determined under Treasury Regulation 1.409A-1(b)(9)(iii)(A)(1) and any Internal Revenue Service guidance issued with respect thereto; or (ii) the maximum amount that may be taken into account under a qualified plan pursuant to
Section 401(a)(17) of the Code for the year in which Executive’s employment is terminated. 
 (e) The foregoing
provisions are intended to comply with the requirements of Section 409A so that none of the severance payments and benefits to be provided hereunder will be subject to the additional tax imposed under Section 409A, and any ambiguities
herein will be interpreted to so comply. The Company and Executive agree to work together in good faith to consider amendments to this Agreement and to take such reasonable actions which are necessary, appropriate or desirable to avoid imposition of
any additional tax or income recognition prior to actual payment to Executive under Section 409A. 

  
 -13-

 25. Counterparts. This Agreement may be executed in counterparts, and each
counterpart will have the same force and effect as an original and will constitute an effective, binding agreement on the part of each of the undersigned. 

  
 -14-

 IN WITNESS WHEREOF, each of the parties has executed this Agreement, in the case of the
Company by a duly authorized officer, as of the day and year written below. 
  

					
	COMPANY:	 		 	
			
	LIMELIGHT NETWORKS, INC.	 		 	
			
	 /s/ Doug Lindroth
	 		 	Date: January 22, 2013
	Doug Lindroth, CFO	 		 	
			
	EXECUTIVE:	 		 	
			
	 /s/ Robert A. Lento
	 		 	Date: January 22, 2013
	Robert A. Lento	 		 	

 [SIGNATURE PAGE TO LENTO EMPLOYMENT AGREEMENT] 

  
 -15-

 Exhibit A 

FORM OF CONFIDENTIAL INFORMATION AGREEMENT 

  
 -16-

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