Sec Form 4/A Filing - Horning Sandra @ Revolution Medicines, Inc. - 2024-06-20

FORM 4/A Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Horning Sandra 2. Issuer Name and Ticker or Trading Symbol Revolution Medicines, Inc. [ RVMD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O REVOLUTION MEDICINES, INC., 700 SAGINAW DR 3. Date of Earliest Transaction (MM/DD/YY) 06/20/2024 (Street) REDWOOD CITY, CA94063 4. If Amendment, Date Original Filed (MM/DD/YY) 06/24/2024 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 06/20/2024 A 2,945 A $ 0 93,432 ( 1 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 37.54 06/20/2024 A 10,248 ( 2 ) 06/19/2034 Common Stock 10,248 $ 0 10,248 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Horning Sandra C/O REVOLUTION MEDICINES, INC. 700 SAGINAW DR REDWOOD CITY, CA94063 X Signatures /s/ Jack Anders, as Attorney-in-fact for Sandra Horning 06/28/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 11,695 restricted stock units ("RSUs"). ( 2 )Shares subject to the Stock Option shall vest in full on the earlier of (i) the first anniversary of June 20, 2024 or (ii) immediately prior to the Issuer's annual meeting of stockholders following the date of grant, subject to the Reporting Person continuing in service through the vesting date.

Remarks: On June 24, 2024, the Reporting Person filed a Form 4 that inadvertently reported incorrect amounts for the RSU and Stock Option awards granted to the Reporting Person on June 20, 2024. The correct amounts and footnote information are reflected in this amendment.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.