October 16, 2019

Mark A. Goldsmith
Chief Executive Officer
Revolution Medicines, Inc.
700 Saginaw Drive
Redwood City, CA 94063

       Re: Revolution Medicines, Inc.
           Draft Registration Statement on Form S-1
           Submitted September 19, 2019
           CIK No. 0001628171

Dear Dr. Goldsmith:

       We have reviewed your draft registration statement and have the
following comments. In
some of our comments, we may ask you to provide us with information so we may
better
understand your disclosure.

       Please respond to this letter by providing the requested information and
either submitting
an amended draft registration statement or publicly filing your registration
statement on
EDGAR. If you do not believe our comments apply to your facts and circumstances
or do not
believe an amendment is appropriate, please tell us why in your response.

      After reviewing the information you provide in response to these comments
and your
amended draft registration statement or filed registration statement, we may
have additional
comments.

Draft Registration Statement on Form S-1

Prospectus Summary
Overview, page 1

1.     Please revise here and throughout to avoid conclusory statements
regarding your product
       candidates and the results of your clinical tests and preclinical
studies by describing how
       you conducted the tests, the number of tests conducted and the range of
results observed.
       For example, we note your disclosure on page 1 that RMC-4630 is a
"potent and selective
       inhibitor of SHP2," your statement on page 4 regarding your "ability to
inhibit various
       oncogenic RAS(ON) mutants" and your statement on page 108 that you have
"substantial
       preclinical evidence that SHP2 is a central node that can be targeted to
disrupt signaling
       pathways that may involve activation of multiple RTKs."
 Mark A. Goldsmith
FirstName LastNameMark A. Goldsmith
Revolution Medicines, Inc.
Comapany NameRevolution Medicines, Inc.
October 16, 2019
Page 2
October 16, 2019 Page 2
FirstName LastName
2.       We note your disclosure on page 1 and throughout regarding your "deep"
pipeline and
         your "deep differentiated pipeline." Please balance this disclosure
here and throughout by
         disclosing that you have only one product candidate that is in
clinical testing and that all
         of your other potential product candidates are in the preclinical and
development stage.
         Similarly, please balance your disclosure on page 3 that you believe
that RMC-4630 is
         well positioned to become the backbone of targeted therapy
combinations for the
         treatment of various RAS-dependent tumors and your disclosure on page
109, which
         describes how each category of your product candidates acts to inhibit
cancer cells, by
         addressing your early stage of clinical testing, preclinical studies
and the development of
         product candidates.
3.       Please revise your pipeline chart to include a column for each
clinical stage. In this
         regard, we note that you have combined Phases 1 and 2 into a single
column.
4.       Please revise to include a brief definition here of what you mean by
"frontier cancer
         targets."
Implications of being an emerging growth company, page 6

5.       Please provide us with copies of all written communications, as
defined in Rule 405 under
         the Securities Act, that you, or anyone authorized to do so on your
behalf, present to
         potential investors in reliance on Section 5(d) of the Securities Act,
whether or not they
         retain copies of the communications.
Risk Factors
Risks related to our common stock and this offering
Our amended and restated certificate of incorporation will provide for an
exclusive forum, page
65

6.       We note that your forum selection provision identifies the Court of
Chancery of the State
         of Delaware as the exclusive forum for certain litigation, including
any "proceeding
         brought on [y]our behalf." Please disclose whether this provision
applies to actions
         arising under the Securities Act or Exchange Act. In that regard, we
note that Section 27
         of the Exchange Act creates exclusive federal jurisdiction over all
suits brought to enforce
         any duty or liability created by the Exchange Act or the rules and
regulations thereunder,
         and Section 22 of the Securities Act creates concurrent jurisdiction
for federal and state
         courts over all suits brought to enforce any duty or liability created
by the Securities Act
         or the rules and regulations thereunder. If the provision applies to
Securities Act claims,
         please also revise your prospectus to state that there is uncertainty
as to whether a court
         would enforce such provision and that investors cannot waive
compliance with the federal
         securities laws and the rules and regulations thereunder. If this
provision does not apply
         to actions arising under the Securities Act or Exchange Act, please
also ensure that the
         exclusive forum provision in the governing documents states this
clearly, or tell us how
         you will inform investors in future filings that the provision does
not apply to any actions
         arising under the Securities Act or Exchange Act. In addition, we note
that, on page 65,
 Mark A. Goldsmith
FirstName LastNameMark A. Goldsmith
Revolution Medicines, Inc.
Comapany NameRevolution Medicines, Inc.
October 16, 2019
October 16, 2019 Page 3
Page 3
FirstName LastName
         you state that your amended and restated certificate of incorporation
will provide for an
         exclusive forum in the Court of Chancery of the State of Delaware and
in the U.S. federal
         district courts, and, on page 179, you identify only the Court of
Chancery of the State of
         Delaware as the exclusive forum. Please revise for consistency.
Use of Proceeds, page 70

7.       Please revise to disclose an estimate of how far in the development of
your multiple RAS
         programs the proceeds from this offering will allow you to reach.
Also, please disclose
         the total estimated cost of each of the specified purposes for which
the net proceeds are
         intended to be used, and, if material amounts of other funds are
necessary to accomplish
         the specified purposes, provide an estimate of the amounts of such
other funds and the
         sources thereof.
Capitalization, page 73

8.       Please revise to disclose the appropriate short-term nature of the
marketable securities
         included in your capitalization table as of September 30, 2019, or
remove as necessary. If
         material, also include disclosure of your accounting and policy for
such securities in your
         pending unaudited interim financial statements as of September 30,
2019.
Management's discussion and analysis of financial condition and results of
operations
Critical accounting policies, significant judgments, and use of estimates
Stock-based compensation, page 99

9.       Once you have an estimated offering price or range, please explain to
us the reasons for
         any differences between the recent valuations of your common shares
leading up to the
         initial public offer and the estimated offering price. This
information will help facilitate
         our review of your accounting for equity issuances including stock
compensation.
Business
Our pipeline
Our SHP2 inhibitor, RMC-4630, page 111

10.      On page 111, please disclose the type of animal tested, the length of
the test, the exact
         number of animals in each test, the dose the animals received in each
test, and whether
         graphs (a) through (d) show the average or mean results. Similarly,
please identify the
         animals tested in the studies described on pages 112 to 115. Also,
please disclose the
         number of mice tested in Figure 7 on page 116. In addition, in your
discussion of these
         studies and throughout the prospectus, please remove your assessments
that the studies
         were effective or that your product candidates are or will be
effective as only the FDA and
         foreign government equivalent regulators have the authority to
determine whether the
         product candidate is effective or safe.
 Mark A. Goldsmith
Revolution Medicines, Inc.
October 16, 2019
Page 4
Our RAS(ON) portfolio
Our RAS (ON) inhibitor programs, page 120

11.      Please tell us how many times you tested the inhibitors in the studies
described in Figures
         13 to 20 on pages 122 to 127 and whether the graphs demonstrate the
average or mean of
         the studies conducted. In addition, please revise to remove
comparisons of your inhibitors
         to other inhibitors unless you have conducted a head-to-head clinical
trial. In this regard,
         we note your comparison of RMC-5552 to other mTOR active site
inhibitors on
         page 127. Also, in Figure 21, please disclose the number of mice
tested and whether the
         results observed were statistically significant.
Collaboration agreement with Sanofi, page 128

12.      We note that you are responsible for 20% of the expenses associated
with the
         identification, validation and optimization of SHP2 inhibitors for
2018-2020 pursuant to
         the research plan and budget under the collaboration agreement with
Sanofi. Please
         provide quantitative information regarding these costs, and revise
your prospectus
         summary and throughout to clarify that you are responsible for 20% of
the costs
         associated with the identification, validation and optimization of
SHP2 inhibitors for 2018
         to 2020. In addition, please describe the material terms of the
Quality Agreement and
         Clinical Supply Agreement with Sanofi or tell us why you believe this
is not necessary. In
         this regard, we note your disclosure on page 171.
Financial Statements
Notes to Financial Statements
7. Acquisition of Warp Drive, page F-22

13.      Provide us your consideration of whether disaggregating the $55.8
million in-process
         research and development asset by individual programs would provide
useful information,
         if such information is available.
       You may contact Bonnie Baynes at 202-551-4924 or Lisa Vanjoske at
202-551-3614 if
you have questions regarding comments on the financial statements and related
matters. Please
contact Sonia Bednarowski at 202-551-3666 or Dietrich King at 202-551-8071 with
any other
questions.



FirstName LastNameMark A. Goldsmith                            Sincerely,
Comapany NameRevolution Medicines, Inc.
                                                               Division of
Corporation Finance
October 16, 2019 Page 4                                        Office of Life
Sciences
FirstName LastName