UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No.     )*

Endurance International Group Holdings, Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

29272B 105

(CUSIP Number)

Hari K. Ravichandran

10 Corporate Drive, Suite 300

Burlington, Massachusetts 01803

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

November 22, 2013

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ¨

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of section 18 of the Securities Exchange Act of 1934, as amended (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Schedule 13D

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Schedule 13D

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Schedule 13D

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Schedule 13D

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Schedule 13D

Item 1. Security and Issuer.

This statement on Schedule 13D (this “Schedule 13D”) relates to the common stock, par value $0.0001 per share (the “Common Stock”), of Endurance International Group Holdings, Inc., a Delaware corporation (the “Issuer”). The address of the Issuer’s principal executive office is 10 Corporate Drive, Suite 300, Burlington, Massachusetts 01803.

Item 2. Identity and Background.

(a) This Schedule 13D is being filed by Mr. Hari K. Ravichandran, an individual, and on behalf of the Ravichandran Family LLC, a Delaware limited liability company, The Hari Ravichandran 2013 Grantor Retained Annuity Trust, a trust formed under the laws of the state of Delaware, and The 2013 Ravichandran Family GST Trust, a trust formed under the laws of the state of Delaware (collectively, the “Reporting Persons”).

Mr. Ravichandran owns directly 6,578,641 shares of Common Stock. Caitlin Ravichandran, Mr. Ravichandran’s wife, is the Manager of the Ravichandran Family LLC, of which Mr. Ravichandran owns 90 common units, or 90%. The Ravichandran 2011 Family Trust, an irrevocable trust established by Mr. Ravichandran for his children and more remote issue as part of his estate plan, owns the remaining 10 common units, or 10%, of the Ravichandran Family LLC. Mrs. Ravichandran and Vidya Ravichandran, Mr. Ravichandran’s sister, are the trustees of the Ravichandran 2011 Family Trust. As a result, Mr. Ravichandran may have voting and investment control over, and may be deemed the beneficial owner of, 1,767,747 shares of Common Stock owned by the Ravichandran Family LLC. In addition, Mr. Ravichandran is also the grantor and trustee of The Hari Ravichandran 2013 Grantor Retained Annuity Trust and the grantor of The 2013 Ravichandran Family GST Trust, an irrevocable trust established by Mr. Ravichandran for his children and more remote issue as part of his estate plan (together with The Hari Ravichandran 2013 Grantor Retained Annuity Trust, the “Ravichandran Trusts”). As a result, Mr. Ravichandran may have voting and investment control over, and may be deemed to be the beneficial owner of, an aggregate of 678,537 shares of Common Stock owned by the Ravichandran Trusts. The number of shares beneficially owned by Mr. Ravichandran also includes 317,071 shares of Common Stock underlying restricted stock units and 227,432 shares of Common Stock underlying options to purchase shares of Common Stock, in each case, that have vested as of the date hereof or will become vested within 60 days after such date.

(b) Mr. Ravichandran’s business address is c/o Endurance International Group Holdings, Inc., 10 Corporate Drive, Suite 300, Burlington, Massachusetts 01803. The principal business address of the Ravichandran Family LLC is c/o Endurance International Group Holdings, Inc., 10 Corporate Drive, Suite 300, Burlington, Massachusetts 01803. The principal business address of The Hari Ravichandran 2013 Grantor Retained Annuity Trust is c/o J.P. Morgan Trust Company of Delaware, 500 Stanton Christiana Road, Newark, DE 19713. The principal business address of The 2013 Ravichandran Family GST Trust is c/o J.P. Morgan Trust Company of Delaware, 500 Stanton Christiana Road, Newark, DE 19713.

(c) Mr. Ravichandran is the President and Chief Executive Officer of the Issuer and serves as a member of the board of directors of the Issuer.

(d) None of the Reporting Persons has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) None of the Reporting Persons has, during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which such Reporting Person was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) Mr. Ravichandran is a United States citizen.

Item 3. Source and Amounts of Funds or Other Consideration.

3,318,538 shares of Common Stock reported in this Schedule 13D were acquired by Mr. Ravichandran in consideration of his employment with the Issuer at various times since inception of the Issuer and prior to the Issuer becoming a reporting company on October 25, 2013, and 2,715,600 shares of Common Stock reported in this Schedule 13D were acquired by Mr. Ravichandran through a rollover of previously-held equity interests in a predecessor of the Issuer.

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Schedule 13D

On October 25, 2013, in consideration of his employment with the Issuer, the Issuer granted Mr. Ravichandran restricted stock units for an aggregate of 1,013,342 shares of Common Stock and options to purchase 2,729,188 shares of Common Stock, of which an aggregate of 544,503 shares of Common Stock have vested as of the date hereof or will become vested within 60 days after such date and are reported in this Schedule 13D.

The 1,767,747 shares of Common Stock held by Ravichandran Family LLC were acquired through a rollover of previously-held equity interests in a predecessor of the Issuer prior to the Issuer becoming a reporting company on October 25, 2013. Caitlin Ravichandran, Mr. Ravichandran’s wife, is the Manager of the Ravichandran Family LLC, of which Mr. Ravichandran owns 90 common units, or 90%. The Ravichandran 2011 Family Trust, an irrevocable trust established by Mr. Ravichandran for his children and more remote issue as part of his estate plan, owns the remaining 10 common units, or 10%, of the Ravichandran Family LLC. Mrs. Ravichandran and Vidya Ravichandran, Mr. Ravichandran’s sister, are the trustees of the Ravichandran 2011 Family Trust.

The 461,228 shares of Common Stock held by The Hari Ravichandran 2013 Grantor Retained Annuity Trust, of which Mr. Ravichandran is the grantor and trustee, were acquired through a gift from Mr. Ravichandran prior to the Issuer becoming a reporting company on October 25, 2013.

The 217,309 shares of Common Stock held by The 2013 Ravichandran Family GST Trust, an irrevocable trust established by Mr. Ravichandran for his children and more remote issue as part of his estate plan, of which Mr. Ravichandran is the grantor, were acquired through a gift from Mr. Ravichandran prior to the Issuer becoming a reporting company on October 25, 2013.

Item 4. Purpose of Transaction.

The information contained in Item 3 above is incorporated herein by reference.

All shares of Common Stock reported as held or acquired by the Reporting Persons in this Schedule 13D were acquired in consideration of Mr. Ravichandran’s employment with the Issuer or for the purpose of investment and were not intended to and did not affect any change in the control of the Issuer.

Mr. Ravichandran is the President and Chief Executive Officer of the Issuer and serves as a member of the board of directors of the Issuer, and in such capacities, Mr. Ravichandran may effect a measure of control over the Issuer and may be involved from time to time in the consideration of matters specified in Item 4 of Schedule 13D on behalf of the Issuer. In addition, Mr. Ravichandran intends to review his investment in the Issuer from time to time and, depending on market conditions and other factors that Mr. Ravichandran may deem material in making his investment decision, Mr. Ravichandran may exercise all or any portion of vested equity awards, make additional purchases or sales of the Issuer’s securities in open market or private transactions, sell all or any portion of the Common Stock hereafter acquired by Mr. Ravichandran in open market or private transactions, or take other steps to increase or decrease his investment in the Issuer.

Except as described above, none of the Reporting Persons currently has any plan or proposal that relates to or would result in any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D.

Item 5. Interest in Securities of the Issuer.

(a) As of the date hereof, Mr. Ravichandran may be deemed the beneficial owner of 9,024,925 shares of Common Stock, representing approximately 7.1% of the Issuer’s currently outstanding Common Stock. Mr. Ravichandran’s ownership consists of (i) 6,578,641 shares of Common Stock held directly by Mr. Ravichandran, including 317,071 shares of Common Stock underlying restricted stock units and 227,432 shares of Common Stock underlying options to purchase shares of Common Stock, in each case, that Mr. Ravichandran had the right to acquire as of the date hereof or has the right to acquire within 60 days of such date, (ii) 1,767,747 shares of Common Stock held by the Ravichandran Family LLC, (iii) 461,228 shares of Common Stock held by The Hari Ravichandran 2013 Grantor Retained Annuity Trust and (iv) 217,309 shares of Common Stock held by The 2013 Ravichandran Family GST Trust.

As of the date hereof, the Ravichandran Family LLC, The Hari Ravichandran 2013 Grantor Retained Annuity Trust and The 2013 Ravichandran Family GST Trust own 1,767,747 shares, 461,228 shares and 217,309 shares of Common Stock, respectively, representing approximately 1.4%, 0.4% and 0.2% of the Issuer’s currently outstanding Common Stock.

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Schedule 13D

The percentage ownership of the Issuer’s currently outstanding Common Stock set forth above is based on 126,964,529 shares of Common Stock outstanding as of November 30, 2013, as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on December 6, 2013

(b) With respect to the number of shares of Common Stock as to which each Reporting Person has:

(i) sole power to vote or to direct the vote with respect to such shares of Common Stock, please see row 7 of the applicable cover sheet to this Schedule 13D for such Reporting Person;

(ii) sole power to dispose or direct the disposition of such shares of Common Stock, please see row 9 of the applicable cover sheet to this Schedule 13D for such Reporting Person; and

(iii) shared power to dispose or to direct the disposition of such shares of Common Stock, please see row 10 of the applicable cover sheet to this Schedule 13D for such Reporting Person.

(c) Except as described above, during the past 60 days, there were no transactions in shares of Common Stock, or any securities directly or indirectly convertible into or exchangeable for shares of Common Stock, by Mr. Ravichandran, any person or entity controlled by Mr. Ravichandran or any person or entity for which Mr. Ravichandran possesses voting or investment control over the securities thereof.

(d) Not applicable.

(e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

There are no contracts, arrangements, understandings or relationships (legal or otherwise) among each Reporting Person and any other person or entities with respect to any securities of the Issuer, except for the following:

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Schedule 13D

Item 7. Material to be Filed as Exhibits.

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Schedule 13D

Signature

After reasonable inquiry and to the best of the undersigned’s knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

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Exhibit 1.1

Endurance International Group Holdings, Inc.

Lock-Up Agreement

[Date]

Goldman, Sachs & Co.

Credit Suisse Securities (USA) LLC

Morgan Stanley & Co. LLC

As Representatives of the

        several Underwriters

c/o Goldman, Sachs & Co.

200 West Street

New York, NY 10282-2198

Ladies and Gentlemen:

The undersigned understands that you, as representatives (the “Representatives”), propose to enter into an Underwriting Agreement on behalf of the several Underwriters named in Schedule I to such agreement (collectively, the “Underwriters”), with WP Expedition Holdings L.P., a Delaware limited partnership (“Holdings L.P.”), or any entity, including without limitation any holding company, resulting from a reorganization, conversion or other restructuring of, or that is a successor in interest to, Holdings L.P. (Holdings L.P. or such entity, as the case may be, the “Company”), providing for a public offering of the common stock of the Company (the “Shares”) pursuant to a Registration Statement on Form S-1 to be filed with the Securities and Exchange Commission (the “SEC”) (such public offering, the “Offering”).

In consideration of the agreement by the Underwriters to offer and sell the Shares, and of other good and valuable consideration the receipt and sufficiency of which is hereby acknowledged, the undersigned agrees that, during the period specified in the following paragraph (the “Lock-Up Period”), the undersigned will not offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of any shares of common stock of the Company, or any options or warrants to purchase any shares of common stock of the Company, or any securities convertible into, exchangeable for or that represent the right to receive shares of common stock of the Company, whether now owned or hereinafter acquired, owned directly by the undersigned (including holding as a custodian) or with respect to which the undersigned has beneficial ownership within the rules and regulations of the SEC (collectively, the “Undersigned’s Shares”). The foregoing restriction is expressly agreed to preclude the undersigned from engaging in any hedging or other transaction which is designed to or which reasonably could be expected to lead to or result in a sale or disposition of the Undersigned’s Shares even if such Shares would be disposed of by someone other than the undersigned. Such prohibited hedging or other transactions would include without limitation any short sale or any purchase, sale or grant of any right (including without limitation any put or call option) with respect to any of the Undersigned’s Shares or with respect to any security that includes, relates to, or derives any significant part of its value from such Shares. If the undersigned is an officer or director of the Company, the undersigned further agrees that the foregoing provisions shall be equally applicable to any Company-directed Shares the undersigned may purchase in the Offering.

The initial Lock-Up Period will commence on the date set forth on the cover of the preliminary prospectus used in connection with the road show relating to the Offering and continue for 180 days after the Offering date set forth on the final prospectus used to sell the Shares (the “Public Offering Date”) pursuant to the Underwriting Agreement.

If the undersigned is an officer or director of the Company, (i) Goldman, Sachs & Co. agrees that, at least three business days before the effective date of any release or waiver of the foregoing restrictions in connection with a transfer of shares of common stock of the Company, Goldman, Sachs & Co. will notify the Company of the impending release or waiver, and (ii) the Company has agreed in the Underwriting Agreement to announce the impending release or waiver by press release through a major news service at least two business days before the effective date of the release or waiver. Any release or waiver granted by Goldman, Sachs & Co. hereunder to any such officer or director shall only be effective two business days after the publication date of such press release. The provisions of this paragraph will not apply if (a) the release or waiver is effected solely to permit a transfer not for consideration and (b) the transferee has agreed in writing to be bound by the same terms described in this letter to the extent and for the duration that such terms remain in effect at the time of the transfer.

Notwithstanding the foregoing, the foregoing restrictions shall not apply to: (i) transfers of the Undersigned’s Shares as a bona fide gift or gifts; (ii) transfers of the Undersigned’s Shares to any immediate family members of the undersigned or any trust for the direct or indirect benefit of the undersigned or the immediate family of the undersigned, or any limited partnership the partners of which are the undersigned and/or immediate family members of the undersigned; (iii) transfers of the Undersigned’s Shares by will or intestacy; (iv) transfers of the Undersigned’s Shares to limited or general partners, members, stockholders or affiliates (as defined under Rule 12b-2 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) of the undersigned or, in the case of a corporation, to a wholly-owned subsidiary of the undersigned; (v) the exercise of the undersigned’s option to purchase Shares granted prior to the date hereof under a stock incentive plan or stock purchase plan of the Company described in the final prospectus used to sell the Shares, or the disposition to the Company of the Undersigned’s Shares pursuant to any contractual relationship in effect on the date of the Underwriting Agreement that provides for the disposition; (vi) transfers of the Undersigned’s Shares acquired on the open market following the Public Offering Date; (vii) the establishment of a trading plan pursuant to Rule 10b5-1 under the Exchange Act for the transfer of Shares; provided that (A) such plan does not provide for the transfer of Shares during the Lock-Up Period and (B) any public announcement regarding the establishment of such plan specifies that no transfer of Shares is permitted during the Lock-Up Period; (viii) the sale of the Undersigned’s Shares to the Underwriters in connection with the Offering; or (ix) transfers of the Undersigned’s Shares with the prior written consent of Goldman, Sachs & Co. on behalf of the Underwriters; provided that, in the case of any transfer or distribution pursuant to clauses (i) through (iv) above, each donee, trustee, legatee, heir, distributee, or other transferee, as the case may be, shall agree to be bound in writing by the restrictions set forth herein and such transfer or distribution shall be a disposition for no value; provided further that, in the case of any transfer, distribution, exercise or disposition pursuant to clauses (i) through (vi) above, no filing under Section 16(a) of the Exchange Act during the Lock-Up Period shall be required or shall be voluntarily made in connection therewith.

For purposes of this Lock-Up Agreement, “immediate family” shall mean any relationship by blood, marriage or adoption, not more remote than first cousin. The undersigned now has, and, except as contemplated by clauses (i) through (ix) above, for the duration of this Lock-Up Agreement will have, good and marketable title to the Undersigned’s Shares, free and clear of all liens, encumbrances, and claims whatsoever. The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the Undersigned’s Shares except in compliance with the foregoing restrictions.

2

In the event that during the Lock-Up Period, Goldman, Sachs & Co. (or in the case of shares of common stock of the Company held by Goldman Sachs & Co. and its affiliates, Credit Suisse Securities (USA) LLC) (as applicable, the “Releasing Underwriter”), waives any prohibition on the transfer of shares of common stock of the Company held by any person or entity that beneficially owns 5% or more of the outstanding shares of common stock of the Company, the Releasing Underwriter shall be deemed to have also waived the prohibitions set forth in this Lock-Up Agreement that would otherwise have applied to the undersigned on the same terms as and with respect to the same percentage of the Undersigned’s Shares as the relative percentage of aggregate shares held by such party receiving the waiver which are subject to such waiver. In the event that, as a result of this paragraph, any of the Undersigned’s Shares are released from the restrictions imposed by this Lock-Up Agreement, the Releasing Underwriter shall use its commercially reasonable efforts to notify the undersigned within three (3) business days of the percentage of shares of Common Stock held by the undersigned that has been released; provided, that the failure to give such notice shall not give rise to any claim or liability against the Releasing Underwriter or the Underwriters.

The undersigned understands that the Company and the Underwriters are relying upon this Lock-Up Agreement in proceeding toward consummation of the Offering. The undersigned further understands that this Lock-Up Agreement is irrevocable and shall be binding upon the undersigned’s heirs, legal representatives, successors, and assigns.

This Lock-Up Agreement and related restrictions shall automatically terminate and be of no further force or effect upon the earliest to occur, if any, of (a) the Representatives, on behalf of the Underwriters, on the one hand, or the Company, on the other hand, advising the other in writing prior to the execution of the Underwriting Agreement that they have or it has determined not to proceed with the Offering, (b) the termination of the Underwriting Agreement before the sale of any Shares to the Underwriters, (c) the registration statement filed with the SEC with respect to the Offering is withdrawn and (d) in the event that the Underwriting Agreement has not been executed by December 31, 2013, provided that the Company may by written notice to the undersigned prior to December 31, 2013 extend such date for a period of up to an additional three months.

[Signature Page Follows]

3

[Signature Page to Lock-Up Agreement]

Exhibit 10.4

Hari Ravichandran Top Up Restricted Stock Unit Agreement

ENDURANCE INTERNATIONAL GROUP HOLDINGS, INC.

Restricted Stock Unit Agreement

This Restricted Stock Unit Agreement (this “Agreement”) is made as of the Agreement Date between Endurance International Group Holdings, Inc., a Delaware corporation (the “Company”), and the Recipient.

NOTICE OF GRANT

This Agreement includes this Notice of Grant and the following Exhibits, which are expressly incorporated by reference in their entirety herein:

Exhibit A – General Terms and Conditions

Exhibit B – Definitions

Exhibit C – 2013 Stock Incentive Plan

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the Agreement Date.

Hari Ravichandran Top Up Restricted Stock Unit Agreement

Restricted Stock Unit Agreement

EXHIBIT A

GENERAL TERMS AND CONDITIONS

The terms and conditions of the award of the right to receive shares of common stock, $0.0001 par value per share, of the Company (the “Common Stock”) made to the Recipient (the “Restricted Stock Units”), as set forth on the cover page of this Agreement, are as follows. This Restricted Stock Unit Agreement shall be subject to, and shall incorporate the terms and conditions of the 2013 Stock Incentive Plan (the “Plan”) as if the Restricted Stock Units were granted pursuant thereto, provided that, to the extent that there is an inconsistency between the Plan and this Agreement, this Agreement shall prevail.

1. Issuance of Restricted Stock Units.

(a) The Restricted Stock Units are granted to the Recipient, effective as of the Agreement Date (as set forth on the Notice of Grant), in consideration of employment and other services rendered and to be rendered by the Recipient to the Company. Each Restricted Stock Unit represents the right to receive one share of Common Stock, subject to the terms and conditions set forth in the cover page of this Agreement, these terms and conditions and the Plan.

(b) The Recipient agrees that the Restricted Stock Units shall be subject to the forfeiture provisions set forth in Section 3 of this Agreement and the restrictions on transfer set forth in Section 4 of this Agreement

2. Vesting Schedule; Delivery. The Restricted Stock Units shall vest in accordance with Vesting Table set forth in the Notice of Grant (the “Vesting Table”). Any fractional number of Restricted Stock Units resulting from the application of the percentages in the Vesting Table shall be rounded down to the nearest whole number of Restricted Stock Units. For the avoidance of doubt, 41.6667% of the Restricted Stock Units are vested as of the Agreement Date.

Notwithstanding the foregoing, if within the one-year period following a Change in Control Event, the Recipient’s employment with the Company is terminated by the Company without Cause or by the Recipient for Good Reason, then all remaining unvested Restricted Stock Units shall become fully vested and free from all forfeiture restrictions as of the date of such termination. “Change In Control Event”, “Cause” and “Good Reason” are defined in Exhibit B.

The Common Stock represented by vested Restricted Stock Units shall be delivered to the Recipient upon the earliest to occur of: (i) October 30, 2016; (ii) 30 days following the death of the Recipient; (iii) 30 days following the Recipient becoming disabled within the meaning of Section 409A of the Internal Revenue Code of 1986, as amended and the guidance issued thereunder (“Section 409A”); (iv) upon the closing of a “change in control event” within the meaning of Section 409A and (v) three days following the Recipient’s “separation from service” within the meaning of Section 409A; provided that, solely to the extent that the Common Stock

is delivered to the Recipient upon the Recipient’s separation from service, the shares of Common Stock shall not be delivered until the date that is six months plus one day following such separation from service to the extent required to avoid adverse taxation under Section 409A. Except as set forth in the preceding sentence, neither the Company nor the Recipient may accelerate or defer delivery of the Common Stock unless specifically permitted or required by Section 409A. When delivered, the Common Stock will initially be issued by the Company in book entry form only, in the name of the Recipient. Following such delivery, the Company shall, if requested by the Recipient, issue and deliver to the Recipient a certificate representing the vested Common Stock.

3. Forfeiture of Unvested Restricted Stock Units Upon Service Termination.

In the event that the Recipient ceases to be an employee of the Company or such other entity the service providers of which are eligible to receive an award under the Plan (each such entity, a “Participating Entity”) for any reason or no reason, with or without cause, all of the Restricted Stock Units that are unvested as of the time of such service termination shall be forfeited immediately and automatically to the Company, without the payment of any consideration to the Recipient, effective as of such termination of service. The Recipient shall have no further rights with respect to any Restricted Stock Units that are so forfeited. If the Recipient is providing service to a Participating Entity, any references in this Agreement to service with the Company shall instead be deemed to refer to service with such Participating Entity.

4. Restrictions on Transfer. The Recipient shall not sell, assign, transfer, pledge, hypothecate or otherwise encumber, by operation of law or otherwise (collectively “transfer”) any Restricted Stock Units, or any interest therein, until such Restricted Stock Units have vested and the Common Stock represented by such Units has been delivered pursuant to Section 2 hereof.

5. Rights as a Shareholder.

The Recipient shall have no rights as a shareholder with respect to the Restricted Stock Units until the Common Stock represented by such Units is delivered to the Recipient, except that to the extent that any dividends are paid with respect to the Common Stock represented by such Restricted Stock Units, whether vested or unvested, prior to delivery of the Common Stock pursuant to Section 2 hereof, such dividends shall accrue for the benefit of the Recipient and shall be paid to the Recipient at the time that the Common Stock is delivered to the Recipient pursuant to Section 2 hereof.

6. Tax Matters.

(a) Acknowledgments; No Section 83(b) Election. The Recipient acknowledges that he or she is responsible for obtaining the advice of the Recipient’s own tax advisors with respect to the grant of the Restricted Stock Units and the Recipient is relying solely on such advisors and not on any statements or representations of the Company or any of its agents with respect to the tax consequences relating to the Restricted Stock Units. The Recipient understands that the Recipient (and not the Company) shall be responsible for the Recipient’s tax

liability that may arise in connection with the acquisition, vesting and/or disposition of the Restricted Stock Units and the Common Stock represented thereby. The Recipient understands that no election under Section 83(b) of the Internal Revenue Code of 1986 (the “Code”) is available with respect to the Restricted Stock Units.

(b) Withholding. The Recipient acknowledges and agrees that the Company has the right to deduct from payments of any kind otherwise due to the Recipient the amount of any withholding taxes required to be withheld with respect to the actions contemplated by this Agreement in any manner permitted by the Plan.

7. Agreement in Connection with Initial Public Offering. The Recipient agrees, in connection with the initial underwritten public offering of the Common Stock pursuant to a registration statement under the Securities Act, (i) not to (a) offer, pledge, announce the intention to sell, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any other securities of the Company convertible into or exercisable or exchangeable for shares of Common Stock or (b) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of shares of Common Stock or other securities of the Company, whether any transaction described in clause (a) or (b) is to be settled by delivery of securities, in cash or otherwise, during the period beginning on the date of the filing of such registration statement with the Securities and Exchange Commission and ending 180 days after the date of the final prospectus relating to the offering (plus up to an additional 34 days to the extent requested by the managing underwriters for such offering in order to address Rule 2711(f) of the National Association of Securities Dealers, Inc. or any similar successor provision), and (ii) to execute any agreement reflecting clause (i) above as may be requested by the Company or the managing underwriters at the time of such offering. The Company may impose stop-transfer instructions with respect to the shares of Common Stock or other securities subject to the foregoing restriction until the end of the “lock-up” period.

8. Miscellaneous.

(a) Authority of Board. In making any decisions or taking any actions with respect to the matters covered by this Agreement, the Company’s Board of Directors (the “Board”) or any one or more of the committees or subcommittees of the Board to which the Board delegates its powers in accordance with the terms of the Plan shall have all of the authority and discretion, and shall be subject to all of the protections, provided for in the Plan. All decisions and actions by the Board or any one or more of its committees or subcommittees to which its powers have been delegated with respect to this Agreement shall be made in its discretion and shall be final and binding on the Recipient.

(b) No Right to Continued Service. The Recipient acknowledges and agrees that, notwithstanding the fact that the vesting of the Restricted Stock Units is contingent upon his or her continued service with the Company, this Agreement does not constitute an express or implied promise of continued service or confer upon the Recipient any rights with respect to continued service by the Company.

(c) Governing Law. This Agreement shall be construed, interpreted and enforced in accordance with the internal laws of the State of Delaware, without regard to any applicable conflicts of law provisions.

(d) Recipient’s Acknowledgments. The Recipient acknowledges that he or she has read this Agreement, has received and read the Plan, and understands the terms and conditions of this Agreement and the Plan.

EXHIBIT B

DEFINITIONS

“Change in Control Event” shall mean the occurrence of one or more of the following events:

1. the acquisition by an individual, entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) (a “Person”) of beneficial ownership of any capital stock of the Company if, after such acquisition, such Person beneficially owns (within the meaning of Rule 13d-3 under the Exchange Act) 50% or more of either (x) the then-outstanding shares of common stock of the Company (the “Outstanding Company Common Stock”) or (y) the combined voting power of the then-outstanding securities of the Company entitled to vote generally in the election of directors (the “Outstanding Company Voting Securities”); provided, however, that for purposes of this subsection (1), the following acquisitions shall not constitute a Change in Control Event: (I) any acquisition directly from the Company (excluding an acquisition pursuant to the exercise, conversion or exchange of any security exercisable for, convertible into or exchangeable for common stock or voting securities of the Company, unless the Person exercising, converting or exchanging such security acquired such security directly from the Company or an underwriter or agent of the Company) or (II) any acquisition by any corporation pursuant to a Business Combination (as defined below) which complies with clauses (x) and (y) of subsection (3) of this definition; or

2. a change in the composition of the Board that results in the Continuing Directors (as defined below) no longer constituting a majority of the Board (or, if applicable, the Board of Directors of a successor corporation to the Company), where the term “Continuing Director” means at any date a member of the Board (x) who was a member of the Board on the date of the initial adoption of the Plan by the Board or (y) who was nominated or elected subsequent to such date by at least a majority of the directors who were Continuing Directors at the time of such nomination or election or whose election to the Board was recommended or endorsed by at least a majority of the directors who were Continuing Directors at the time of such nomination or election; provided, however, that there shall be excluded from this clause (y) any individual whose initial assumption of office occurred as a result of an actual or threatened election contest with respect to the election or removal of directors or other actual or threatened solicitation of proxies or consents, by or on behalf of a person other than the Board; or

3. the consummation of a merger, consolidation, reorganization, recapitalization or share exchange involving the Company or a sale or other disposition of all or substantially all of the assets of the Company (a “Business Combination”), unless, immediately following such Business Combination, each of the following two conditions is satisfied: (x) all or substantially all of the individuals and entities who were the beneficial owners of the Outstanding Company Common Stock and Outstanding Company Voting Securities immediately prior to such Business Combination beneficially own, directly or indirectly, more than 50% of the then-outstanding shares of common stock and the combined voting power of the then-outstanding securities entitled to vote generally in the election of directors, respectively, of the resulting or acquiring corporation in such Business Combination (which shall include, without limitation, a corporation which as a result of such transaction owns the Company or substantially all of the Company’s

assets either directly or through one or more subsidiaries) (such resulting or acquiring corporation is referred to herein as the “Acquiring Corporation”) in substantially the same proportions as their ownership of the Outstanding Company Common Stock and Outstanding Company Voting Securities, respectively, immediately prior to such Business Combination and (y) no Person (excluding any employee benefit plan (or related trust) maintained or sponsored by the Company or by the Acquiring Corporation) beneficially owns, directly or indirectly, 50% or more of the then-outstanding shares of common stock of the Acquiring Corporation, or of the combined voting power of the then-outstanding securities of such corporation entitled to vote generally in the election of directors (except to the extent that such ownership existed prior to the Business Combination); or

4. the liquidation or dissolution of the Company.

“Cause” shall have the meaning set forth in the employment agreement between the Recipient and the Company.

“Good Reason” shall have the meaning set forth in the employment agreement between the Recipient and the Company.

EXHIBIT C

2013 STOCK INCENTIVE PLAN

[Intentionally omitted]

ENDURANCE INTERNATIONAL GROUP HOLDINGS, INC.

Amendment No. 1 to Top Up Restricted Stock Unit Agreement

This Amendment No. 1 (this “Amendment”), dated as of December 12, 2013, amends that certain Top Up Restricted Stock Unit Agreement (the “Agreement”), dated as of October 25, 2013, by and between Endurance International Group Holdings, Inc., a Delaware corporation (the “Company”) and Hari Ravichandran (the “Recipient”).

WHEREAS, the Company and the Recipient desire to amend the Agreement, as set forth herein;

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and the Recipient hereby agree as follows:

“(b) Withholding. The Recipient acknowledges and agrees that the Company has the right to deduct from payments of any kind otherwise due to the Recipient the amount of any withholding taxes required to be withheld with respect to the actions contemplated by this Agreement in any manner permitted by the Plan. The Recipient agrees and acknowledges that the following automatic sale provisions shall apply:

(i) Upon the delivery of the Common Stock pursuant to Section 2 hereof, the Company shall sell, or arrange for the sale of, such number of the shares as is sufficient to generate net proceeds sufficient to satisfy the Company’s minimum statutory withholding obligations with respect to the income recognized by the Recipient upon the delivery of the Common Stock (based on minimum statutory withholding rates for federal and state tax purposes, including payroll taxes, that are applicable to such income), and the Company shall retain such net proceeds in satisfaction of such tax withholding obligations.

(ii) The Recipient hereby appoints the Chief Legal Officer and the Secretary of the Company, and each of them acting singly, his or her attorney in fact, to sell the Recipient’s shares in accordance with this Section 6. The Recipient agrees to execute and deliver such documents, instruments and certificates as may reasonably be required in connection with the sale of the shares pursuant to this Section 6.

(iii) The Recipient represents to the Company that, as of the date hereof, he or she is not aware of any material nonpublic information about the Company or the Common Stock. The Recipient and the Company have structured this Agreement to constitute a “binding contract” relating to the sale of Common Stock pursuant to this Section 6, consistent with the affirmative defense to liability under Section 10(b) of the Securities Exchange Act of 1934 under Rule 10b5-1(c) promulgated under such Act.”

2. Except as amended hereby, the Agreement shall remain in full force and effect. From and after the date of this Amendment, all references in the Agreement to “the Agreement” shall be deemed to be references to the Agreement as amended hereby.

3. This Amendment may be executed in counterparts, each of which shall be deemed to be an original.

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date written above.

Exhibit 10.5

Hari Ravichandran IPO Date Restricted Stock Unit Agreement

ENDURANCE INTERNATIONAL GROUP HOLDINGS, INC.

Restricted Stock Unit Agreement

2013 Stock Incentive Plan

This Restricted Stock Unit Agreement (this “Agreement”) is made as of the Agreement Date between Endurance International Group Holdings, Inc., a Delaware corporation (the “Company”), and the Recipient.

NOTICE OF GRANT

This Agreement includes this Notice of Grant and the following Exhibits, which are expressly incorporated by reference in their entirety herein:

Exhibit A – General Terms and Conditions

Exhibit B – Definitions

Exhibit C – 2013 Stock Incentive Plan

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the Agreement Date.

Hari Ravichandran IPO Date Restricted Stock Unit Agreement

Restricted Stock Unit Agreement

2013 Stock Incentive Plan

EXHIBIT A

GENERAL TERMS AND CONDITIONS

The terms and conditions of the award of the right to receive shares of common stock, $0.0001 par value per share, of the Company (the “Common Stock”) made to the Recipient (the “Restricted Stock Units”), as set forth on the cover page of this Agreement, and subject to the terms and conditions set forth in the 2013 Stock Incentive Plan (the “Plan”), are as follows:

1. Issuance of Restricted Stock Units.

(a) The Restricted Stock Units are granted to the Recipient, effective as of the Agreement Date (as set forth on the Notice of Grant), in consideration of employment and other services rendered and to be rendered by the Recipient to the Company. Each Restricted Stock Unit represents the right to receive one share of Common Stock, subject to the terms and conditions set forth in the cover page of this Agreement, these terms and conditions and the Plan.

(b) The Recipient agrees that the Restricted Stock Units shall be subject to the forfeiture provisions set forth in Section 3 of this Agreement and the restrictions on transfer set forth in Section 4 of this Agreement

2. Vesting Schedule; Delivery. The Restricted Stock Units shall vest in accordance with Vesting Table set forth in the Notice of Grant (the “Vesting Table”). Any fractional number of Restricted Stock Units resulting from the application of the percentages in the Vesting Table shall be rounded down to the nearest whole number of Restricted Stock Units.

Notwithstanding the foregoing, if within the one-year period following a Change in Control Event, the Recipient’s employment with the Company is terminated by the Company without Cause or by the Recipient for Good Reason, then all remaining unvested Restricted Stock Units shall become fully vested and free from all forfeiture restrictions as of the date of such termination. “Change In Control Event”, “Cause” and “Good Reason” are defined in Exhibit B.

The Common Stock represented by vested Restricted Stock Units shall be delivered to the Recipient upon the earliest to occur of: (i) 30 days following the fourth anniversary of the Agreement Date; (ii) 30 days following the death of the Recipient; (iii) 30 days following the Recipient becoming disabled within the meaning of Section 409A of the Internal Revenue Code of 1986, as amended and the guidance issued thereunder (“Section 409A”); (iv) upon the closing of a “change in control event” within the meaning of Section 409A and (v) three days following the Recipient’s “separation from service” within the meaning of Section 409A; provided that, solely to the extent that the Common Stock is delivered to the Recipient upon the Recipient’s separation from service, the shares of Common Stock shall not be delivered until the date that is six months plus one day following such separation from service to the extent required to avoid adverse taxation under Section 409A. Except as set forth in the preceding sentence, neither the

Company nor the Recipient may accelerate or defer delivery of the Common Stock unless specifically permitted or required by Section 409A. When delivered, the Common Stock will initially be issued by the Company in book entry form only, in the name of the Recipient. Following such delivery, the Company shall, if requested by the Recipient, issue and deliver to the Recipient a certificate representing the vested Common Stock.

3. Forfeiture of Unvested Restricted Stock Units Upon Service Termination.

In the event that the Recipient ceases to be an employee of the Company or such other entity the service providers of which are eligible to receive an award under the Plan (each such entity, a “Participating Entity”) for any reason or no reason, with or without cause, all of the Restricted Stock Units that are unvested as of the time of such service termination shall be forfeited immediately and automatically to the Company, without the payment of any consideration to the Recipient, effective as of such termination of service. The Recipient shall have no further rights with respect to any Restricted Stock Units that are so forfeited. If the Recipient is providing service to a Participating Entity, any references in this Agreement to service with the Company shall instead be deemed to refer to service with such Participating Entity.

4. Restrictions on Transfer. The Recipient shall not sell, assign, transfer, pledge, hypothecate or otherwise encumber, by operation of law or otherwise (collectively “transfer”) any Restricted Stock Units, or any interest therein, until such Restricted Stock Units have vested and the Common Stock represented by such Units has been delivered pursuant to Section 2 hereof.

5. Rights as a Shareholder.

The Recipient shall have no rights as a shareholder with respect to the Restricted Stock Units until the Common Stock represented by such Units is delivered to the Recipient, except that to the extent that any dividends are paid with respect to the Common Stock represented by such Restricted Stock Units, whether vested or unvested, prior to delivery of the Common Stock pursuant to Section 2 hereof, such dividends shall accrue for the benefit of the Recipient and shall be paid to the Recipient at the time that the Common Stock is delivered to the Recipient pursuant to Section 2 hereof.

6. Tax Matters.

(a) Acknowledgments; No Section 83(b) Election. The Recipient acknowledges that he or she is responsible for obtaining the advice of the Recipient’s own tax advisors with respect to the grant of the Restricted Stock Units and the Recipient is relying solely on such advisors and not on any statements or representations of the Company or any of its agents with respect to the tax consequences relating to the Restricted Stock Units. The Recipient understands that the Recipient (and not the Company) shall be responsible for the Recipient’s tax liability that may arise in connection with the acquisition, vesting and/or disposition of the Restricted Stock Units and the Common Stock represented thereby. The Recipient understands that no election under Section 83(b) of the Internal Revenue Code of 1986 (the “Code”) is available with respect to the Restricted Stock Units.

(b) Withholding. The Recipient acknowledges and agrees that the Company has the right to deduct from payments of any kind otherwise due to the Recipient the amount of any withholding taxes required to be withheld with respect to the actions contemplated by this Agreement in any manner permitted by the Plan.

7. Agreement in Connection with Initial Public Offering. The Recipient agrees, in connection with the initial underwritten public offering of the Common Stock pursuant to a registration statement under the Securities Act, (i) not to (a) offer, pledge, announce the intention to sell, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any other securities of the Company convertible into or exercisable or exchangeable for shares of Common Stock or (b) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of shares of Common Stock or other securities of the Company, whether any transaction described in clause (a) or (b) is to be settled by delivery of securities, in cash or otherwise, during the period beginning on the date of the filing of such registration statement with the Securities and Exchange Commission and ending 180 days after the date of the final prospectus relating to the offering (plus up to an additional 34 days to the extent requested by the managing underwriters for such offering in order to address Rule 2711(f) of the National Association of Securities Dealers, Inc. or any similar successor provision), and (ii) to execute any agreement reflecting clause (i) above as may be requested by the Company or the managing underwriters at the time of such offering. The Company may impose stop-transfer instructions with respect to the shares of Common Stock or other securities subject to the foregoing restriction until the end of the “lock-up” period.

8. Miscellaneous.

(a) Authority of Board. In making any decisions or taking any actions with respect to the matters covered by this Agreement, the Company’s Board of Directors (the “Board”) or any one or more of the committees or subcommittees of the Board to which the Board delegates its powers in accordance with the terms of the Plan shall have all of the authority and discretion, and shall be subject to all of the protections, provided for in the Plan. All decisions and actions by the Board or any one or more of its committees or subcommittees to which its powers have been delegated with respect to this Agreement shall be made in its discretion and shall be final and binding on the Recipient.

(b) No Right to Continued Service. The Recipient acknowledges and agrees that, notwithstanding the fact that the vesting of the Restricted Stock Units is contingent upon his or her continued service with the Company, this Agreement does not constitute an express or implied promise of continued service or confer upon the Recipient any rights with respect to continued service by the Company.

(c) Governing Law. This Agreement shall be construed, interpreted and enforced in accordance with the internal laws of the State of Delaware, without regard to any applicable conflicts of law provisions.

(d) Recipient’s Acknowledgments. The Recipient acknowledges that he or she has read this Agreement, has received and read the Plan, and understands the terms and conditions of this Agreement and the Plan.

EXHIBIT B

DEFINITIONS

“Change in Control Event” shall mean the occurrence of one or more of the following events:

1. the acquisition by an individual, entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) (a “Person”) of beneficial ownership of any capital stock of the Company if, after such acquisition, such Person beneficially owns (within the meaning of Rule 13d-3 under the Exchange Act) 50% or more of either (x) the then-outstanding shares of common stock of the Company (the “Outstanding Company Common Stock”) or (y) the combined voting power of the then-outstanding securities of the Company entitled to vote generally in the election of directors (the “Outstanding Company Voting Securities”); provided, however, that for purposes of this subsection (1), the following acquisitions shall not constitute a Change in Control Event: (I) any acquisition directly from the Company (excluding an acquisition pursuant to the exercise, conversion or exchange of any security exercisable for, convertible into or exchangeable for common stock or voting securities of the Company, unless the Person exercising, converting or exchanging such security acquired such security directly from the Company or an underwriter or agent of the Company) or (II) any acquisition by any corporation pursuant to a Business Combination (as defined below) which complies with clauses (x) and (y) of subsection (3) of this definition; or

2. a change in the composition of the Board that results in the Continuing Directors (as defined below) no longer constituting a majority of the Board (or, if applicable, the Board of Directors of a successor corporation to the Company), where the term “Continuing Director” means at any date a member of the Board (x) who was a member of the Board on the date of the initial adoption of the Plan by the Board or (y) who was nominated or elected subsequent to such date by at least a majority of the directors who were Continuing Directors at the time of such nomination or election or whose election to the Board was recommended or endorsed by at least a majority of the directors who were Continuing Directors at the time of such nomination or election; provided, however, that there shall be excluded from this clause (y) any individual whose initial assumption of office occurred as a result of an actual or threatened election contest with respect to the election or removal of directors or other actual or threatened solicitation of proxies or consents, by or on behalf of a Person other than the Board; or

3. the consummation of a merger, consolidation, reorganization, recapitalization or share exchange involving the Company or a sale or other disposition of all or substantially all of the assets of the Company (a “Business Combination”), unless, immediately following such Business Combination, each of the following two conditions is satisfied: (x) all or substantially all of the individuals and entities who were the beneficial owners of the Outstanding Company Common Stock and Outstanding Company Voting Securities immediately prior to such Business Combination beneficially own, directly or indirectly, more than 50% of the then-outstanding shares of common stock and the combined voting power of the then-outstanding securities entitled to vote generally in the election of directors, respectively, of the resulting or acquiring corporation in such Business Combination (which shall include, without limitation, a corporation which as a result of such transaction owns the Company or substantially all of the Company’s

assets either directly or through one or more subsidiaries) (such resulting or acquiring corporation is referred to herein as the “Acquiring Corporation”) in substantially the same proportions as their ownership of the Outstanding Company Common Stock and Outstanding Company Voting Securities, respectively, immediately prior to such Business Combination and (y) no Person (excluding any employee benefit plan (or related trust) maintained or sponsored by the Company or by the Acquiring Corporation) beneficially owns, directly or indirectly, 50% or more of the then-outstanding shares of common stock of the Acquiring Corporation, or of the combined voting power of the then-outstanding securities of such corporation entitled to vote generally in the election of directors (except to the extent that such ownership existed prior to the Business Combination); or

4. the liquidation or dissolution of the Company.

“Cause” shall have the meaning set forth in the employment agreement between the Recipient and the Company.

“Good Reason” shall have the meaning set forth in the employment agreement between the Recipient and the Company.

EXHIBIT C

2013 STOCK INCENTIVE PLAN

[Intentionally omitted]

ENDURANCE INTERNATIONAL GROUP HOLDINGS, INC.

Amendment No. 1 to IPO Date Restricted Stock Unit Agreement

This Amendment No. 1 (this “Amendment”), dated as of December 12, 2013, amends that certain IPO Date Restricted Stock Unit Agreement (the “Agreement”), dated as of October 25, 2013, by and between Endurance International Group Holdings, Inc., a Delaware corporation (the “Company”) and Hari Ravichandran (the “Recipient”).

WHEREAS, the Company and the Recipient desire to amend the Agreement, as set forth herein;

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and the Recipient hereby agree as follows:

“(b) Withholding. The Recipient acknowledges and agrees that the Company has the right to deduct from payments of any kind otherwise due to the Recipient the amount of any withholding taxes required to be withheld with respect to the actions contemplated by this Agreement in any manner permitted by the Plan. The Recipient agrees and acknowledges that the following automatic sale provisions shall apply:

(i) Upon the delivery of the Common Stock pursuant to Section 2 hereof, the Company shall sell, or arrange for the sale of, such number of the shares as is sufficient to generate net proceeds sufficient to satisfy the Company’s minimum statutory withholding obligations with respect to the income recognized by the Recipient upon the delivery of the Common Stock (based on minimum statutory withholding rates for federal and state tax purposes, including payroll taxes, that are applicable to such income), and the Company shall retain such net proceeds in satisfaction of such tax withholding obligations.

(ii) The Recipient hereby appoints the Chief Legal Officer and the Secretary of the Company, and each of them acting singly, his or her attorney in fact, to sell the Recipient’s shares in accordance with this Section 6. The Recipient agrees to execute and deliver such documents, instruments and certificates as may reasonably be required in connection with the sale of the shares pursuant to this Section 6.

(iii) The Recipient represents to the Company that, as of the date hereof, he or she is not aware of any material nonpublic information about the Company or the Common Stock. The Recipient and the Company have structured this Agreement to constitute a “binding contract” relating to the sale of Common Stock pursuant to this Section 6, consistent with the affirmative defense to liability under Section 10(b) of the Securities Exchange Act of 1934 under Rule 10b5-1(c) promulgated under such Act.”

2. Except as amended hereby, the Agreement shall remain in full force and effect. From and after the date of this Amendment, all references in the Agreement to “the Agreement” shall be deemed to be references to the Agreement as amended hereby.

3. This Amendment may be executed in counterparts, each of which shall be deemed to be an original.

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date written above.

Exhibit 10.6

Hari Ravichandran Option Agreement

ENDURANCE INTERNATIONAL GROUP HOLDINGS, INC.

Stock Option Agreement

2013 Stock Incentive Plan

This Stock Option Agreement (this “Agreement”) is made between Endurance International Group Holdings, Inc., a Delaware corporation (the “Company”), and the Participant.

NOTICE OF GRANT

This Agreement includes this Notice of Grant and the following Exhibits, which are expressly incorporated by reference in their entirety herein:

Exhibit A – General Terms and Conditions

Exhibit B – Definitions

Exhibit C – 2013 Stock Incentive Plan

IN WITNESS WHEREOF, the parties hereto have executed this Agreement.

Stock Option Agreement

2013 Stock Incentive Plan

EXHIBIT A

GENERAL TERMS AND CONDITIONS

For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follows:

1. Grant of Option. This Agreement evidences the grant by the Company, on the grant date (the “Grant Date”) set forth in the Notice of Grant that forms part of this Agreement (the “Notice of Grant”), to the Participant of an option to purchase, in whole or in part, on the terms provided herein and in the Company’s 2013 Stock Incentive Plan (the “Plan”), the number of shares set forth in the Notice of Grant (the “Shares”) of common stock, $0.0001 par value per share, of the Company (“Common Stock”) at the exercise price per Share set forth in the Notice of Grant (the “Exercise Price”). Unless earlier terminated, this option shall expire at the time set forth in the Notice of Grant (the “Final Exercise Date”).

It is intended that the option evidenced by this Agreement shall not be an incentive stock option as defined in Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the “Code”). Except as otherwise indicated by the context, the term “Participant”, as used in this option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms.

2. Vesting Schedule.

This option will become exercisable (“vest”) in accordance with the Vesting Table set forth in the Notice of Grant.

The right of exercise shall be cumulative so that to the extent the option is not exercised in any period to the maximum extent permissible it shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of the Final Exercise Date or the termination of this option under Section 3 hereof or the Plan.

Notwithstanding the foregoing, if within the one-year period following a Change in Control Event, the Participant’s employment with the Company is terminated by the Company without Cause or by the Participant for Good Reason, then the remaining unvested portion of the option shall become fully vested and exercisable as of the date of such termination. “Change In Control Event”, “Cause” and “Good Reason” are defined in Exhibit B.

3. Exercise of Option.

(a) Form of Exercise. Each election to exercise this option shall be accompanied by a notice of exercise in the form designated by the Company or its designee, or by such other notification, including electronic notification, as may be permitted by the Company or its designee and in all cases accompanied by payment in full in the manner provided in the Plan, which for purposes of this Agreement shall include a “net exercise” pursuant to Section 5(f)(4) of the Plan. The Participant may purchase less than the number of Shares covered hereby, provided that no partial exercise of this option may be for any fractional share.

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(b) Continuous Relationship with the Company Required. Except as otherwise provided in this Section 3, this option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an employee of the Company or any other entity (a “Participating Entity”) the service providers of which are eligible to receive an award under the Plan (an “Eligible Participant”). If the Participant provides services to a Participating Entity, any references in this Agreement to service with the Company shall instead be deemed to refer to service with such Participating Entity.

(c) Termination of Relationship with the Company. If the Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraphs (d), (e) and (f) below or expressly set forth in another agreement between the Participant and the Company, the right to exercise this option shall terminate one year after such cessation (but in no event after the Final Exercise Date), provided that this option shall be exercisable only to the extent that the Participant was entitled to exercise this option on the date of such cessation. Notwithstanding the foregoing, if the Participant, prior to the Final Exercise Date, violates the non-competition or confidentiality provisions of any employment contract, confidentiality and nondisclosure agreement or other agreement between the Participant and the Company, the right to exercise this option shall terminate immediately upon such violation.

(d) Exercise Period Upon Disability. If the Participant ceases to be an Eligible Participant by reason of becoming disabled (within the meaning of Section 22(e)(3) of the Code) prior to the Final Exercise Date and the Company has not terminated such relationship for Cause, then, except as expressly set forth in another agreement between the Participant and the Company, this option shall be exercisable, within the period of three years following such cessation (but in no event after the Final Exercise Date), by the Participant, provided that this option shall be exercisable only to the extent that this option was exercisable by the Participant on the date of such cessation.

(e) Exercise Period Upon Death. If the Participant ceases to be an Eligible Participant by reason of his or her death prior to the Final Exercise Date and the Company has not terminated such relationship for Cause, or the Participant dies within the ninety (90)-day period following cessation of service with the Company other than for Cause, then, except as expressly set forth in another agreement between the Participant and the Company, this option shall be exercisable, within the period of three years following the date of death of the Participant (but in no event after the Final Exercise Date), by the Participant’s authorized transferee, provided that this option shall be exercisable only to the extent that this option was exercisable by the Participant on the date of his or her death.

(f) Termination for Cause. If, prior to the Final Exercise Date, the Participant’s service is terminated by the Company for Cause, then, except as expressly set forth in another agreement between the Participant and the Company, the right to exercise this option shall terminate immediately upon the effective date of such termination of service. The Participant’s service shall be considered to have been terminated for Cause if the Company determines, within 30 days after the Participant’s resignation, that termination for Cause was warranted.

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4. Tax Matters. No Shares will be issued pursuant to the exercise of this option unless and until the Participant pays to the Company, or makes provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option.

5. Transfer Restrictions. This option may not be sold, assigned, transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution, and, during the lifetime of the Participant, this option shall be exercisable only by the Participant. The terms of this Agreement shall be binding upon the executors, administrators, heirs, successors and assigns of the Participant.

6. Agreement in Connection with Initial Public Offering. The Participant agrees, in connection with the initial underwritten public offering of the Common Stock pursuant to a registration statement under the Securities Act, (i) not to (a) offer, pledge, announce the intention to sell, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any other securities of the Company or (b) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of shares of Common Stock or other securities of the Company, whether any transaction described in clause (a) or (b) is to be settled by delivery of securities, in cash or otherwise, during the period beginning on the date of the filing of such registration statement with the Securities and Exchange Commission and ending 180 days after the date of the final prospectus relating to the offering (plus up to an additional 34 days to the extent requested by the managing underwriters for such offering in order to address Rule 2711(f) of the National Association of Securities Dealers, Inc. or any similar successor provision), and (ii) to execute any agreement reflecting clause (i) above as may be requested by the Company or the managing underwriters at the time of such offering. The Company may impose stop-transfer instructions with respect to the shares of Common Stock or other securities subject to the foregoing restriction until the end of the “lock-up” period.

7. Miscellaneous.

(a) No Rights to Service. The Participant acknowledges and agrees that the grant of the this option and its vesting pursuant to Section 2 do not constitute an express or implied promise of continued service with the Company for the vesting period of the option, or for any period.

(b) Entire Agreement. This Agreement and the Plan constitute the entire agreement between the parties, and supersede all prior agreements and understandings, relating to the subject matter of this Agreement; provided that any separate employment or severance agreement between the Company and the Participant that includes terms relating to the acceleration of vesting of equity awards shall not be superseded by this Agreement. In the event of a conflict between the terms and provisions of the Plan and the terms and provisions of this Agreement, the Plan terms and provisions shall prevail.

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(c) Governing Law. This Agreement shall be construed, interpreted and enforced in accordance with the internal laws of the State of Delaware, without regard to any applicable conflict of law principles.

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EXHIBIT B

DEFINITIONS

“Change in Control Event” shall mean the occurrence of one or more of the following events:

(1) the acquisition by an individual, entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934, and amended (the “Exchange Act”)) (a “Person”) of beneficial ownership of any capital stock of the Company if, after such acquisition, such Person beneficially owns (within the meaning of Rule 13d-3 under the Exchange Act) 50% or more of either (x) the then-outstanding shares of common stock of the Company (the “Outstanding Company Common Stock”) or (y) the combined voting power of the then-outstanding securities of the Company entitled to vote generally in the election of directors (the “Outstanding Company Voting Securities”); provided, however, that for purposes of this subsection (1), the following acquisitions shall not constitute a Change in Control Event: (I) any acquisition directly from the Company (excluding an acquisition pursuant to the exercise, conversion or exchange of any security exercisable for, convertible into or exchangeable for common stock or voting securities of the Company, unless the Person exercising, converting or exchanging such security acquired such security directly from the Company or an underwriter or agent of the Company) or (II) any acquisition by any corporation pursuant to a Business Combination (as defined below) which complies with clauses (x) and (y) of subsection (3) of this definition; or

(2) a change in the composition of the Board that results in the Continuing Directors (as defined below) no longer constituting a majority of the Board (or, if applicable, the Board of Directors of a successor corporation to the Company), where the term “Continuing Director” means at any date a member of the Board (x) who was a member of the Board on the date of the initial adoption of the Plan by the Board or (y) who was nominated or elected subsequent to such date by at least a majority of the directors who were Continuing Directors at the time of such nomination or election or whose election to the Board was recommended or endorsed by at least a majority of the directors who were Continuing Directors at the time of such nomination or election; provided, however, that there shall be excluded from this clause (y) any individual whose initial assumption of office occurred as a result of an actual or threatened election contest with respect to the election or removal of directors or other actual or threatened solicitation of proxies or consents, by or on behalf of a person other than the Board; or

(3) the consummation of a merger, consolidation, reorganization, recapitalization or share exchange involving the Company or a sale or other disposition of all or substantially all of the assets of the Company (a “Business Combination”), unless, immediately following such Business Combination, each of the following two conditions is satisfied: (x) all or substantially all of the individuals and entities who were the beneficial owners of the Outstanding Company Common Stock and Outstanding Company Voting Securities immediately prior to such Business Combination beneficially own, directly or indirectly, more than 50% of the then-outstanding shares of common stock and the combined voting power of the then-outstanding securities entitled to vote generally in the election of directors, respectively, of the resulting or acquiring corporation in such Business Combination (which shall include, without limitation, a corporation

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which as a result of such transaction owns the Company or substantially all of the Company’s assets either directly or through one or more subsidiaries) (such resulting or acquiring corporation is referred to herein as the “Acquiring Corporation”) in substantially the same proportions as their ownership of the Outstanding Company Common Stock and Outstanding Company Voting Securities, respectively, immediately prior to such Business Combination and (y) no Person (excluding any employee benefit plan (or related trust) maintained or sponsored by the Company or by the Acquiring Corporation) beneficially owns, directly or indirectly, 50% or more of the then-outstanding shares of common stock of the Acquiring Corporation, or of the combined voting power of the then-outstanding securities of such corporation entitled to vote generally in the election of directors (except to the extent that such ownership existed prior to the Business Combination); or

(4) the liquidation or dissolution of the Company.

“Cause” shall have the meaning set forth in the employment agreement between the Participant and the Company.

“Good Reason” shall have the meaning set forth in the employment agreement between the Participant and the Company.

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EXHIBIT C

2013 STOCK INCENTIVE PLAN

[Intentionally omitted]

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Exhibit 99.1

Joint Filing Agreement

Each of the undersigned hereby expresses his, her or its agreement that the attached Schedule 13D (and any amendments thereto) relating to the Common Stock of Endurance International Group Holdings, Inc. is filed on behalf of each of the undersigned.