Joint Filer Information

Name:	Deerfield Mgmt, L.P., Deerfield Mgmt IV, L.P., Deerfield Management Company, L.P., Deerfield Private Design Fund IV, L.P. and Deerfield Partners, L.P.
Address:	780 Third Avenue, 37th Floor New York, NY 10017
Designated Filer:	James E. Flynn
Issuer and Ticker Symbol:	Revolution Medicines, Inc. [RVMD]
Date of Event Requiring Statement:	February 18, 2020

The undersigned, Deerfield Mgmt, L.P., Deerfield Mgmt IV, L.P., Deerfield Management Company, L.P., Deerfield Private Design Fund IV, L.P. and Deerfield Partners, L.P. are jointly filing the attached Statement of Changes in Beneficial Ownership on Form 4 with James E. Flynn with respect to the beneficial ownership of securities of Revolution Medicines, Inc..

DEERFIELD MGMT, L.P. By: J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact	DEERFIELD PRIVATE DESIGN FUND IV, L.P. By: Deerfield Mgmt IV, L.P., General Partner By: J.E. Flynn Capital IV, LLC, General Partner By: /s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact
DEERFIELD MGMT IV, L.P. By: J.E. Flynn Capital IV, LLC, General Partner By: /s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact
DEERFIELD MANAGEMENT COMPANY, L.P. By: Flynn Management LLC, General Partner By: /s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact
DEERFIELD PARTNERS, L.P. By: Deerfield Mgmt, L.P., General Partner By: J.E. Flynn Capital, LLC, General Partner By: /s/ Jonathan Isler Jonathan Isler, Attorney-In-Fact