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Exhibit 10.39
AMENDMENT NO. 1 TO MASTER SERVICES AGREEMENT

This amendment (the "Amendment") to the Master Services Agreement by and between X4 Pharmaceuticals, Inc., a Delaware corporation with a business address at 784 Memorial Drive, Suite 140, Cambridge, MA 02139 ("X4"), and Aptuit (Oxford) Limited, incorporated in England and Wales, having an address at 111 Innovation Drive, Milton Park, Abingdon, Oxfordshire, OX14 4RZ, England (the "Company"), dated February 19, 2016 (the "Agreement"), incorporated by reference herein, is effective on 23rd November 2016 (the "Effective Date").

RECITALS

WHEREAS, X4 and Company wish to add the Affiliates of Company (as listed in Annex A hereto) to the Agreement such that they can provide Services under the Agreement, effective 23rd November 2016; and

WHEREAS, this Amendment sets out and/or refers to the additional terms and conditions upon which such change shall be undertaken.

Now, THEREFORE, in consideration of the foregoing and the mutual covenants and promises contained in this Amendment, the parties hereto agree as follows:

1.  Defined terms in the Agreement shall have the same meaning in this Amendment.

2. With X4's prior written consent, the Company may use the Services of its corporate Affiliates to fulfil Aptuit's obligations under the Agreement. Any Affiliate so used shall be subject to all of the terms and conditions applicable to the Company under the Agreement and entitled to all rights and protections afforded to the Company under the Agreement. For the avoidance  of doubt, a fully executed Statement of Work clearly stating the intention to use Company's Affiliates shall suffice for the aforementioned prior written consent.

3. Save as otherwise expressly referred to in this Amendment the terms and conditions of the Agreement shall apply in all other respects and remain in full force and effect.

[Remainder of Page Intentionally Left Blank]

IN WITNESS WHEREOF, the parties hereto have executed this AMENDMENT on the Effective Date.

									
	X4 PHARMACEUTICALS, INC.
		APTUIT (OXFORD) LIMITED

			
	By: /s/ John Celebi		By: /s/ Petra Dieterich
	Printed Name: John Celebi		Printed Name: Petra Dieterich
	Title: Chief Operating Officer		Title: Senior Director API, Head of SiteDocument

Exhibit 4.6

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934

Throughout this exhibit, references to the "Company," "we," "our," and "us" refer to Extraction Oil & Gas, Inc. The following summary of terms of our common stock, $0.01 par value per share (the "common stock") is based upon our amended and restated certificate of incorporation (the "certificate of incorporation") and bylaws (the "bylaws"). This summary is not complete and is subject to, and qualified in its entirety by reference to, the certificate of incorporation and bylaws. For a complete description of the terms and provisions of the common stock, refer to the certificate of incorporation and bylaws, which are filed as exhibits to our Annual Report on Form 10-K. We encourage you to read these documents and the applicable portion of the Delaware General Corporation Law, as amended (the "DGCL"), carefully.

Common Stock

Our authorized capital stock consists of 900,000,000 shares of common stock and 50,000,000 shares of preferred stock, $0.01 par value per share.

Except as provided by law or in a preferred stock designation, holders of common stock are entitled to one vote for each share held of record on all matters submitted to a vote of the stockholders, will have the exclusive right to vote for the election of directors and do not have cumulative voting rights. Except as otherwise required by law, holders of common stock are not entitled to vote on any amendment to the certificate of incorporation (including any certificate of designations relating to any series of preferred stock) that relates solely to the terms of any outstanding series of preferred stock if the holders of such affected series are entitled, either separately or together with the holders of one or more other such series, to vote thereon pursuant to the certificate of incorporation (including any certificate of designations relating to any series of preferred stock) or pursuant to the DGCL. Subject to prior rights and preferences that may be applicable to any outstanding shares or series of preferred stock, holders of common stock are entitled to receive ratably in proportion to the shares of common stock held by them such dividends (payable in cash, stock or otherwise), if any, as may be declared from time to time by our board of directors out of funds legally available for dividend payments. All outstanding shares of common stock are fully paid and non-assessable. The holders of common stock have no preferences or rights of conversion, exchange, preemption or other subscription rights. There are no redemption or sinking fund provisions applicable to the common stock. In the event of any voluntary or involuntary liquidation, dissolution or winding-up of our affairs, holders of common stock will be entitled to share ratably in our assets in proportion to the shares of common stock held by then that are remaining after payment or provision for payment of all of our debts and obligations and after distribution in full of preferential amounts to be distributed to holders of outstanding shares of preferred stock, if any.

Anti-Takeover Effects of Provisions of Our Certificate of Incorporation, our Bylaws and Delaware Law

Some provisions of Delaware law, our certificate of incorporation and our bylaws contain provisions that could make the following transactions more difficult: acquisitions of us by means of a tender offer, a proxy contest or otherwise; or removal of our incumbent officers and directors. These provisions may also have the effect of preventing changes in our management. It is possible that these provisions could make it more difficult to accomplish or could deter transactions that stockholders may otherwise consider to be in their best interest or in our best interests, including transactions that might result in a premium over the market price for our shares.

These provisions are expected to discourage coercive takeover practices and inadequate takeover bids. These provisions are also designed to encourage persons seeking to acquire control of us to first negotiate with us. We believe that the benefits of increased protection and our potential ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire or restructure us outweigh the disadvantages of discouraging these proposals because, among other things, negotiation of these proposals could result in an improvement of their terms.

Delaware Law

Section 203 of the DGCL prohibits a Delaware corporation, including those whose securities are listed for trading on the NASDAQ, from engaging in any business combination with any interested stockholder for a period of three years following the date that the stockholder became an interested stockholder, unless:

•the transaction is approved by the board of directors before the date the interested stockholder attained that status;

•upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced; or

•on or after such time the business combination is approved by the board of directors and authorized at a meeting of stockholders by at least two-thirds of the outstanding voting stock that is not owned by the interested stockholder.

We have elected to not be subject to the provisions of Section 203 of the DGCL.

Certificate of Incorporation and Bylaws

Provisions of our certificate of incorporation and bylaws may delay or discourage transactions involving an actual or potential change in control or change in our management, including transactions in which stockholders might otherwise receive a premium for their shares, or transactions that our stockholders might otherwise deem to be in their best interests. Therefore, these provisions could adversely affect the price of our common stock.

Among other things, our certificate of incorporation and bylaws:

•establish advance notice procedures with regard to stockholder proposals relating to the nomination of candidates for election as directors or new business to be brought before meetings of our stockholders. These procedures provide that notice of stockholder proposals must be timely given in writing to our corporate secretary prior to the meeting at which the action is to be taken. Generally, to be timely, notice must be received at our principal executive offices not less than 90 days nor more than 120 days prior to the first anniversary date of the annual meeting for the preceding year. Our bylaws specify the requirements as to form and content of all stockholders’ notices. These requirements may preclude stockholders from bringing matters before the stockholders at an annual or special meeting;

•provide our board of directors the ability to authorize undesignated preferred stock. This ability makes it possible for our board of directors to issue, without stockholder approval, preferred stock with voting or other rights or preferences that could impede the success of any attempt to change control of us. These and other provisions may have the effect of deferring hostile takeovers or delaying changes in control or management of our company;

•provide that subject to the rights of the holders of any series of preferred stock to elect directors under specified circumstances, the authorized number of directors may be changed only by resolution of the board of directors;

•provide that all vacancies, including newly created directorships, may, except as otherwise required by law or, if applicable, the rights of holders of a series of preferred stock, be filled by the affirmative vote of a majority of directors then in office, even if less than a quorum;

•provide that any action required or permitted to be taken by the stockholders must be effected at a duly called annual or special meeting of stockholders and may not be effected by any consent in writing in lieu of a meeting of such stockholders, subject to the rights of the holders of any series of preferred stock with respect to such series;

•provide our certificate of incorporation and bylaws may be amended by the affirmative vote of the holders of at least two-thirds of our then outstanding common stock;

•provide that special meetings of our stockholders may only be called by the board of directors (pursuant to a resolution adopted by a majority of the board), the chief executive officer or the chairman of the board;

•provide for our board of directors to be divided into three classes of directors, with each class as nearly equal in number as possible, serving staggered three year terms, other than directors which may be elected by holders of preferred stock, if any. This system of electing and removing directors may tend to discourage a third party from making a tender offer or otherwise attempting to obtain control of us, because it generally makes it more difficult for stockholders to replace a majority of the directors;

•provide that we renounce any interest in the business opportunities of (i) Yorktown or any of its officers, directors, employees, partners, affiliates and (ii) any portfolio company in which such entities or persons have an equity interest (other than us and our subsidiaries) (other than our directors that are presented business opportunities in their capacity as our directors) and that they have no obligation to offer us those investments or opportunities; and

•provide that our bylaws can be amended or repealed at any regular or special meeting of stockholders or by the board of directors.

Forum Selection

Our certificate of incorporation provides that unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware will, to the fullest extent permitted by applicable law, be the sole and exclusive forum for:

•any derivative action or proceeding brought on our behalf;

•any action asserting a claim for a breach of a fiduciary duty owed by any of our directors, officers, employees or agents to us or our stockholders;

•any action asserting a claim against us arising pursuant to any provision of the DGCL, our certificate of incorporation or our bylaws; or

•any action asserting a claim against us that is governed by the internal affairs doctrine, in each such case subject to such Court of Chancery having personal jurisdiction over the indispensable parties named as defendants therein.

Our certificate of incorporation also provides that any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock will be deemed to have notice of and to have consented to this forum selection provision. However, it is possible that a court could find our forum selection provision to be inapplicable or unenforceable.

The choice of forum provisions summarized above are not intended to apply to claims for which federal law creates exclusive jurisdiction, including the Exchange Act. We further note that the Securities Act creates concurrent jurisdiction for federal and state courts over all suits brought to enforce any duty or liability created under the Securities Act, so there is uncertainty as to whether a court would enforce the forum selection provision with respect to claims under the Securities Act, and in any event, our stockholders cannot waive compliance with federal securities laws and the rules and regulations thereunder. Stockholders may be subject to increased costs to bring these claims, and choice of forum provisions could have the effect of discouraging claims or limiting investors' ability to bring claims in a judicial forum that they find favorable.

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