Form of Amendment No. 1 to each Forward Purchase Agreement

Exhibit 10.15

AMENDMENT NO. 1 TO

FORWARD PURCHASE AGREEMENT

This first amendment (the “Amendment”) to that certain Forward Purchase Agreement (the “Agreement”) entered into as of October 5, 2017, between One Madison Corporation, a Cayman Islands exempted company (the “Company”), the party listed as the purchaser on the signature page hereof (the “Purchaser”) and, solely for the purposes of Section 7 of the Agreement, One Madison Group LLC (the “Sponsor”), is entered into as of [__], 2017 pursuant to Section 10(l) of the Agreement. Capitalized terms that are used herein, except as otherwised defined herein, shall have the meanings ascribed to them in the Agreement. In consideration of the mutual promises and covenants contained herein, the Company, the Sponsor and the Purchaser hereby agree as follows:

Section 4 of the Agreement shall be amended and restated in its entirety as follows:

“4.   Right of First Refusal. Subject to the terms and conditions of this Section 4, if, in connection with or prior to the Business Combination Closing, the Company proposes to issue any equity securities, or securities convertible into, exchangeable or exercisable for equity securities (including working capital loans to the Company to finance transaction costs in connection with an intended initial Business Combination to the extent they may be convertible at the option of the lender into warrants of the post-Business Combination entity (“Working Capital Loans”)), other than the Public Units (and their component Class A Shares (the “Public Shares”) and Public Warrants) and Excluded Securities (as defined below) (“New Equity Securities”), or offer or seek commitments for any New Equity Securities to backstop any such capital raise, the Company shall first make an offer of the New Equity Securities to the Purchaser in accordance with the following provisions of this Section 4:

(a) Offer Notice.

(i) The Company shall give written notice (the “Offering Notice”) to the Purchaser and the other Forward Contract Parties stating its bona fide intention to offer the New Equity Securities and specifying the number of New Equity Securities and the material terms and conditions, including the price, pursuant to which the Company proposes to offer the New Equity Securities and the applicable pro rata share of such New Equity Securities offered to the Purchaser pursuant to such Offering Notice.

(ii) The Offering Notice shall constitute the Company’s offer to sell the New Equity Securities to the Purchaser and the other Forward Contract Parties, which offer shall be irrevocable for a period of ten (10) Business Days (the “ROFR Notice Period”).

(b) Exercise of Right of First Refusal.

(i) Upon receipt of the Offering Notice, the Purchaser shall have until the end of the ROFR Notice Period to accept the Company’s offer to purchase all (but not less than all) of its pro rata share of the New Equity Securities, based on the number of Forward Purchase Shares the Purchaser has agreed to purchase hereunder out of the sum of (A) the total number of Class A Shares that the Purchaser and other Forward Contract Parties have agreed to purchase at the FPS Closing plus (B) the number of Public Shares beneficially owned or held, directly or indirectly, by entities affiliated with The Blackstone Group L.P. (the “BSOF Entities”) at the time of receipt of the Offering Notice (which number shall not exceed the Ownership Cap for purposes of this calculation), by delivering a written notice (a “ROFR Notice”) to the Company stating that it accepts the Company’s offer to purchase such New Equity Securities on the terms specified in the Offering Notice. Any ROFR Notice so delivered shall be binding upon delivery and irrevocable by the Purchaser. As used herein, the “Ownership Cap” shall initially mean 4,000,000 Class A Shares; provided, that if the actual number of Public Units offered and sold in the IPO is less than 30,000,000 (without regard to any exercise of the over-allotment option), then the Ownership Cap shall be automatically reduced on a pro rata basis.

(ii) If the Purchaser does not deliver a ROFR Notice during the ROFR Notice Period, the Purchaser shall be deemed to have waived all of the Purchaser’s rights to purchase the New Equity Securities offered pursuant to the Offering Notice under this Section 4. Thereafter, the Company shall, within five (5) Business Days after the expiration of the ROFR Notice Period, give an Offering Notice to all other Forward Contract Parties and the BSOF Entities who have delivered a ROFR Notice to the Company during the ROFR Notice Period accepting the Company’s initial offer to purchase the New Equity Securities, informing them that they have the right to increase the number of New Equity Securities that they have accepted pursuant to the initial ROFR Notice. Each such Forward Contract Party and the BSOF Entities shall then have two (2) Business Days (the “Subsequent Offering Period”) in which to accept such second offer, by giving notice of acceptance (the “Subsequent ROFR Notice”) to the Company prior to the expiration of the Subsequent Offering Period, as to the BSOF Entities’ and such Forward Contract Party’s pro rata share (based on the formula set forth in clause (i) above) of the Purchaser’s portion of the New Equity Securities not accepted pursuant to the initial Offering Notice to the Purchaser.

(iii) If any Forward Contract Party or the BSOF Entities does not deliver the Subsequent Offer Notice to the Company prior to the expiration of the Subsequent Offering Period, such Forward Contract Party or the BSOF Entities shall be deemed to have waived all of such party’s rights to purchase New Equity Securities in such second offer by the Company. The Company shall thereafter be free to sell or enter into an agreement to sell the Purchaser’s pro rata portion of such New Equity Securities to any third party (including any other Forward Contract Parties who accepted such second offer or the BSOF Entities) without any further obligation to the Purchaser pursuant to this Section 4 within the ninety (90) day period thereafter (and with respect to an agreement to sell, consummate such sale at any time thereafter) on terms and conditions not more favorable to the third party than those set forth in any Offering Notice. If the Company does not sell or enter into an agreement to sell the Purchaser’s pro rata portion of the New Equity Securities within such period, the rights provided hereunder shall be deemed to be revived and the New Equity Securities shall not be offered to any third party unless first re-offered to the Purchaser in accordance with this Section 4.

(c) Excluded Securities. For purposes hereof, the term “Excluded Securities” means Class B Shares (and Class A Shares and/or Class C Shares for which such Class B Shares are convertible) issued to the Sponsor prior to the IPO, private placement warrants issued by the Company to the Forward Contract Parties or the BSOF Entities in connection with the IPO for $1.00 per warrant for an aggregate of $8,000,000 (or $8,900,000 if the underwriters’ over-allotment option is exercised in full) and which have the same exercise price as the Warrants (“Private Placement Warrants”) issued pursuant to a private placement agreement between the Forward Contract Parties and the Company (the “Private Placement Warrant Agreement”), warrants issued upon the conversion of Working Capital Loans, any securities issued by the Company as consideration to any seller in the Business Combination, any Class A Shares, Class B Shares (and Class A Shares and/or Class C Shares for which such Class B Shares are convertible), Class C Shares (and Class A Shares for which such Class C Shares are convertible) and Forward Purchase Warrants issued pursuant to this Agreement, the Forward Contracts or that certain strategic partnership agreement between the Company, the Sponsor and the BSOF Entities.

(d) Additional Private Placements. Notwithstanding anything to the contrary contained herein, prior to the IPO, the Company will not issue or agree to issue any securities (other than Forward Purchase Securities in the amounts set forth in Section 3(l), Private Placement Warrants and the Public Units) without the Purchaser’s prior written consent.”

Upon and after the effectiveness of this Amendment, each reference in the Agreement to “this Agreement”, “hereunder”, “hereof” or words of like import referring to the Agreement shall mean and be a reference to the Agreement as modified and amended hereby.

This Amendment may be executed in one or more counterparts, all of which when taken together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to the other party, it being understood that both parties need not sign the same counterpart. In the event that any signature is delivered by facsimile transmission or any other form of electronic delivery, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such signature page were an original thereof.

This Amendment and the rights and obligations of the parties hereunder shall be construed in accordance with and governed by the laws of Delaware applicable to contracts wholly performed within the borders of such state, without giving effect to the conflict of law principles thereof.

This Amendment is the joint product of the Company, the Sponsor and the Purchaser and each provision hereof has been subject to the mutual consultation, negotiation and agreement of such parties and shall not be construed for or against any party hereto. IN WITNESS WHEREOF, the undersigned have executed this Agreement to be effective as of the date first set forth above.