Exhibit 4.2(b)
APPOINTMENT, ASSIGNMENT AND ASSUMPTION AGREEMENT
THIS APPOINTMENT, ASSIGNMENT AND ASSUMPTION AGREEMENT (this Agreement) is entered into and effective as of
November 9, 2023 by and among EQRx, Inc., a Delaware corporation (the Company), Revolution Medicines, Inc. (Parent), Continental Stock Transfer & Trust Company, a New York corporation
(Continental) and Equiniti Trust Company, LLC, a New York limited liability trust company (Equiniti).
WHEREAS, the Company (formerly known as CM Life Sciences III Inc.) and Continental have previously entered into a warrant agreement,
dated as of April 6, 2021 (the Warrant Agreement) governing the terms of the Companys outstanding warrants (the Warrants) to purchase shares of the Companys common stock, par value $0.0001
per share (Company Common Stock); and
WHEREAS, pursuant to that certain merger agreement, dated as of
July 31, 2023 (the Merger Agreement), by and among the Company, Parent, Equinox Merger Sub I, Inc., a Delaware corporation and a wholly-owned subsidiary of Parent (Merger Sub I) and Equinox Merger Sub II
LLC, a Delaware limited liability company and wholly owned subsidiary of Parent (Merger Sub II), on the date hereof, the Company merged with and into Merger Sub I, with the Company surviving the merger and continuing as a wholly
owned subsidiary of Parent (the First Merger), and as soon as practicable after the First Merger and as the second step in a single integrated transaction with the First Merger, the Company will merge with and into Merger Sub II
(the Second Merger and collectively with the First Merger, the Merger), with Merger Sub II surviving the Second Merger and continuing as a wholly owned subsidiary of Parent; and
WHEREAS, by virtue of the Merger, and pursuant to Section 4.5 of the Warrant Agreement, at the Effective Time (as defined in the
Merger Agreement), the Warrants ceased to represent a warrant exercisable for Company Common Stock and became exercisable for the Merger Consideration (as defined in the Merger Agreement), and from and after the Effective Time, the Warrants relate
to the Parents common stock, par value $0.0001 per share; and
WHEREAS, effective upon the Effective Time, the Company wishes
to appoint Equiniti to serve as successor Warrant Agent under the Warrant Agreement; and
WHEREAS, in connection with and
effective upon such appointment, (i) Continental wishes to assign and transfer all of its rights, authority, powers, immunities, duties, interests and obligations as Warrant Agent under the Warrant Agreement, as hereby amended, to Equiniti, and
with immediate effect upon the effectiveness of such appointment and assignment, to resign its duties as Warrant Agent under the Warrant Agreement, (ii) Equiniti wishes to accept such appointment and to assume and accept all of such rights,
authority, powers, immunities, duties, interests and obligations as Warrant Agent under the Warrant Agreement, and (iii) the Company wishes to approve such assignment and assumption and such resignation with immediate effect upon the
effectiveness of such appointment and assignment.
NOW, THEREFORE, for good and valuable consideration, receipt of
which is hereby acknowledged, the parties hereby agree as follows:
1. Appointment of Successor Warrant Agent and Transfer
Agent. The Company hereby appoints Equiniti to serve as successor Warrant Agent under the Warrant Agreement, effective upon the Effective Time. Continental hereby (a) assigns and transfers, and Equiniti hereby accepts and
assumes, effective as of the Effective Time, all of Continentals rights, authority, powers, immunities, duties, interests and obligations in, and under the Warrant Agreement and Warrants, as Warrant Agent, and (b) resigns its duties