First Amendment to Asset Purchase Agreement by and between Adamas Pharmaceuticals, Inc. and Osmotica Pharmaceutical US LLC

This Amendment No. 1 to Asset Purchase Agreement (“Amendment”) is entered into on April 27, 2021 (the “Amendment Effective Date”) by and between Adamas Pharmaceuticals, Inc. (“Adamas”), and Osmotica Pharmaceutical US LLC, Osmotica, Kereskedelmi és Szolgáltató KFT, and Osmotica Holdings US LLC (collectively, “Osmotica”).

WHEREAS, Adamas and Osmotica entered into an Asset Purchase Agreement which was signed on December 1, 2020 and which closed on January 4, 2021 (the “Agreement”);

WHEREAS, Adamas and Company wish to amend the Agreement, effective as of the Amendment Effective Date, as set forth in this Amendment;

NOW, THEREFORE, the Parties agree as follows:

1.Definitions. All capitalized terms used herein and not otherwise defined in this Amendment will have the meanings ascribed to them in the Agreement.

2.Amendment to Section 1.2. Section 1.2 (Additional Batches of Product) is hereby replaced in its entirety with the following:

3.Assignment. Adamas Pharmaceuticals, Inc. assigned all of its rights and obligations under the Agreement to its Affiliate, Adamas Pharma, LLC, on January 4, 2021, as permitted under Section 10.8 (Assignment) of the Agreement, and Adamas Pharma, LLC accepted the assignment of all such rights and obligations as of January 4, 2021. This Amendment formalizes that assignment.

4.No Further Modification. Except as expressly modified and amended in this Amendment, the Agreement will remain in full force and effect in accordance with its terms.

5.Headings. The section headings in this Amendment are inserted only as a matter of convenience, and in no way define, limit, or interpret the scope of this Amendment or of any particular section hereof.

6.Miscellaneous. This Amendment may be executed in multiple counterparts, each of which will be deemed an original and all of which will constitute one and the same instrument. No agreement hereafter made will be affected to change, modify, or discharge this Amendment, in whole or in part, unless such agreement is in writing and signed by or on behalf of the Party against whom the enforcement of the change, modification, or discharge is sought. This Amendment will be binding on the Parties and their respective representatives, successors, and permitted assigns. Each person whose signature appears below represents and warrants that he or she has the authority to bind the entity on whose behalf he or she has executed this Amendment. A signature on behalf of one Party delivered to the other Party electronically, as by facsimile or via electronic mail, will be binding just as if delivered in person as an original signature.

IN WITNESS WHEREOF, the Parties have executed this Amendment by causing it to be signed by their duly authorized representatives.