Form of First Amendment to the Series A Certificate of Designations

FIRST AMENDMENT TO THE

CERTIFICATE OF DESIGNATIONS

Pursuant to Section 151 of the General

Corporation Law of the State of Delaware

SERIES A REDEEMABLE CONVERTIBLE PREFERRED STOCK

(Par Value $0.0001 Per Share)

U.S. Well Services, Inc. (the “Corporation”), a corporation organized and existing under and by virtue of the provisions of the General Corporation Law of the State of Delaware (the “General Corporation Law”), hereby certifies that, pursuant to the authority expressly granted to and vested in the Board of Directors of the Corporation (the “Board of Directors”) by the Second Amended and Restated Certificate of Incorporation of the Corporation (as amended from time to time in accordance with its terms and the General Corporation Law, the “Certificate of Incorporation”), which authorizes the Board of Directors, by resolution, to provide out of the unissued shares of the preferred stock (the “Preferred Stock”) for one or more series of Preferred Stock and to establish from time to time the number of shares to be included in each such series and to fix the voting rights (if any), designations, powers, preferences and relative, participating, optional, special and other rights (if any) of each such series and any qualifications, limitations and restrictions thereof, and in accordance with the provisions of Section 151 of the General Corporation Law, the Board of Directors duly adopted on June 21, 2022 the following recitals and resolutions:

WHEREAS, the Board of Directors previously fixed the rights, preferences, restrictions and other matters relating to a Series A Redeemable Convertible Preferred Stock (hereinafter referred to as the “Series A Preferred Stock”), consisting of up to 55,000 shares of the Series A Preferred Stock which the Corporation has the authority to issue, as set forth in that certain Certificate of Designations of the Series A Preferred Stock dated May 24, 2019 (the “Certificate of Designations”);

WHEREAS, pursuant to Section 7.14(b) of the Purchase Agreement among the Corporation and the purchasers party thereto dated May 23, 2019, such parties agreed not to treat the Series A Preferred Stock as “preferred stock” within the meaning of Section 305 of the Internal Revenue Code of 1986, as amended, and U.S. Treasury Regulation § 1.305-5 for U.S. federal income tax and withholding tax purposes;

WHEREAS, on June 21, 2022, the Corporation, ProFrac Holding Corp., a Delaware corporation (“Parent”), and Thunderclap Merger Sub I, Inc., a Delaware corporation and an indirect subsidiary of Parent (“Merger Sub Inc”), have entered into an Agreement and Plan of Merger (as the same may be amended from time to time, the “Merger Agreement”), providing for, among other things, the merger of Merger Sub Inc. with and into the Corporation, with the Corporation surviving the merger as the surviving corporation pursuant to the terms and conditions of the Merger Agreement.