Joinder to Sponsor Agreement. Transferee hereby agrees to be bound by:

Joinder to Letter Agreement. Transferee hereby agrees to be bound by paragraph 6(b), paragraph 7(a) (subject to paragraph 7(c)) and paragraphs 11 through 16 of the Letter Agreement; in each case, to the same extent as if Transferee were an original party to the Letter Agreement (but solely for the purpose of the provisions of the Letter Agreement specified above and solely with respect to the Transferee Conversion Shares).

“Joinder Agreement” means a joinder agreement in the form of [Exhibit L].

“Joinder Agreement” means a Joinder Agreement in substantially the form of Exhibit E.

“Joinder” means a joinder agreement substantially in the form of Exhibit J-11] to this Agreement.

“Lender Joinder Agreement” means a joinder agreement in form and substance reasonably satisfactory to the Administrative Agent delivered in connection with [Section 5.13].

“Joinder Agreement” means a joinder agreement substantially in the form of [Exhibit D] executed and delivered in accordance with the provisions of Section 6.13.

“Loan Documents” means this Agreement, each Note, each Issuer Document, each Guarantor Joinder Agreement, each Co-[[Consolidated Parties:Organization]] Joinder Agreement and the Fee Letter.

SECTION # This Joinder may be executed in counterparts, each of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Joinder shall become effective when the Joint First Lien Collateral Agent, each First Lien Collateral Agent and First Lien Representative shall have received a counterpart of this Joinder that bears the signatures of the New Representative and the New Collateral Agent. Delivery of an executed signature page to this Joinder by facsimile transmission or other electronic means shall be effective as delivery of a manually signed counterpart of this Joinder.

Joinder – Crestview Investor I JOINDER TO SPONSOR AGREEMENT AND LETTER AGREEMENT This Joinder to Sponsor Agreement and Letter Agreement, dated as of July 3, 2019 (this “Joinder”), is executed by Crestview III USWS, L.P., a Delaware limited partnership (“Transferee”), in favor of U.S. Well Services, Inc., a Delaware corporation (formerly Matlin & Partners Acquisition Corporation) (the “Company”), pursuant to [Section 3(d)] of the Sponsor Agreement (as defined below) and paragraph 7(c) of the Letter Agreement (as defined below). Each capitalized term used and not otherwise defined in this Joinder has the meaning given to such term in the Sponsor Agreement.