United States securities and exchange commission logo





                             September 24, 2021

       Eli Casdin
       Chief Executive Officer and Director
       CM Life Sciences III Inc.
       c/o Corvex Management LP
       667 Madison Avenue
       New York, New York 10065

                                                        Re: CM Life Sciences
III Inc.
                                                            Registration
Statement on Form S-4
                                                            Filed August 25,
2021
                                                            File No. 333-259054

       Dear Mr. Casdin:

              We have reviewed your 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 amending your registration
statement and providing the
       requested information. 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 any amendment to your registration statement and
the information you
       provide in response to these comments, we may have additional comments.

       Form S-4, filed August 25, 2021

       Cover Page

   1.                                                   Please include on the
inside front cover page the information set forth in Item 2 of Form
                                                        S-4.
       Q: Following the Business Combination, will the Company's securities
continue to trade on a
       stock exchange?, page 14

   2.                                                   Given that the Nasdaq
listing condition is waivable, please revise to disclose that
                                                        shareholders will not
have certainty at the time they vote regarding whether the post-
                                                        combination company   s
common stock and warrants will be listed on a national securities
                                                        exchange following the
business combination. Also, revise the risk factor on page 116 to
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         reflect that the Nasdaq listing condition may be waived.
Q: Can the Initial Stockholders redeem their Founder Shares in connection with
consummation
of the Business Combination?, page 24

3.       We note that certain the Initial Stakeholders agreed to waive their
redemption rights.
         Please describe any consideration provided in exchange for this
agreement.
Cautionary Note Regarding Forward-Looking Statements, page 51

4.       We note your reliance upon the safe harbor for forward-looking
statements provided by
         the Private Securities Litigation Reform Act of 1995. However, it is
unclear whether this
         safe harbor is available for forward-looking statements made in
connection with a SPAC
         merger. Therefore, please qualify your assertion with a statement
indicating that there is
         uncertainty as to the availability of the safe harbor in connection
with a SPAC merger.
Risk Factors
Mr. Casdin, our chief executive officer and one of our directors, and his
affiliates have interests
in and relationships with EQRx..., page 119

5.       Please disclose the approximate dollar value of Mr. Casdin's interest
in the target based on
         the transaction value and recent trading prices, as compared to the
price paid. Please also
         highlight this information in your Questions and Answers and/or
Summary discussion.
Background of the Business Combination, page 187

6.       We note your disclosure on page 188 that the business combination
transactions with
         other potential targets were ultimately not pursued. Please expand
your disclosure to
         discuss in greater detail these other potential targets, including
their size and material
         attributes, the reasons they were not pursued, and whether you entered
into discussions
         with any of the other five potential target companies.
7.       Please provide further detail on how you initially selected Company A,
the potential terms
         discussed with Company A, the progress of those discussions, and the
factors and
         discussions surrounding the decision to cease discussions with Company
A. We also note
         that there is an overlap of CMLS III's discussions with Company A and
EQRx
         between April 26, 2021, when Mr. Casdin requested an updated EQRx
corporate
         presentation from Mr. Borisy, and May 27, 2021, when discussions with
Company A
         ceased and when Mr. Casdin discussed a business combination with Mr.
Borisy. Please
         discuss the overlap of these discussions, including when the CMLS III
Board became
         aware of Mr. Casdin's discussions, the considerations the Board
evaluated regarding Mr.
         Casdin's role as an interested party, and why EQRx was a more
attractive target
         acquisition as compared to Company A.
8.       We note that the initial LOI included the following terms: "(i) that
Mr. Casdin and one
         member from Softbank would join the board of directors of the combined
public
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         company, with up to two additional directors to be agreed upon between
the chief
         executive officers of CMLS III and EQRx; (ii) the pre-money equity
value of EQRx of
         $4 billion (including a $500 million earn-out based on post-closing
share price
         performance); and (iii) at least $1 billion would be raised via a
combination of a private
         investment in public equity and forward purchase agreements." Please
describe the basis
         for the initial valuation and how you came to it.
9.       Please reconcile the pre-money equity values of EQRx described in this
section with
         the $3.65 billion in aggregate consideration to be paid in the
transaction.
Opinion of Financial Advisor to CMLS III, page 199

10.      Please clarify the criteria on which the companies identified in this
section were selected
         and whether any companies that also satisfied those criteria were
omitted from the
         analysis. Please also provide similar disclosure regarding the
companies selected for the
         Selected Precedent Transactions analysis.
11.      Please clarify whether the analyses considered the possibility that
the EQRx product
         candidates do not successfully complete clinical trials. If the
analysis did not consider this
         possibility, please explain why.
Certain EQRx Projected Financial Information, page 201

12.      Please revise to discuss all material assumptions used to develop the
projections, including
         which product candidates obtain regulatory approval, the markets in
which you received
         regulatory approval, the dates the respective products receive
regulatory approval in each
         market, when these products become commercially available, and any
assumptions about
         competition and related cost of sales and net income for 2026 and
2028. Additionally,
         discuss the possible impact if your assumptions are incorrect, and
identify the probabilities
         assigned to management   s assumptions. To the extent your projections
are based on
         multiple scenarios, discuss that fact, identify the various scenarios
used, and how each
         scenario was weighted.
EQRx's Business, page 251

13.      Please provide the basis for the statement that your focus on
validated targets will result
         in success rates ranging from five to seven out of every ten clinical
candidates. Please
         provide similar support for the statement in the founders' letter
regarding the improved
         success rate for your product candidates being something closer to
three or five out of ten.
The EQRx business opportunity, page 259

14.      Please the balance your discussion in this section and throughout the
prospectus where
         appropriate with prominent disclosure that you have no products
approved for commercial
         sale and have not generated any revenue to date and that your pricing
model is untested in
         the pharmaceutical industry. Please also disclose that there can be no
assurance that your
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         pricing model will achieve market acceptance or be able to compete
effectively with
         existing models or models introduced in the future.
15.      We note your statement regarding the global drug spend in 2021 is
estimated to be
         approximately $1 trillion. Please balance this disclosure and the
figure on page 260 with
         the size of the markets for the product candidates you are currently
developing.
Time for something new - time for "New Pharma", page 260

16.      Please delete the statement that your programs have the potential to
be equivalent or
         superior to other therapies in their class as this statement implies
an expectation of
         regulatory approval and is inappropriate given the stage of
development for your
         programs. Please revise similar statements that your products are
equally as good or
         better.
Business model innovation in other industries, page 265

17.      We note your comparison to other industries. Please balance the
disclosure in this section
         with the fact that your business model is untested in the
pharmaceutical industry, and that
         there can be no assurance that your business model will achieve market
acceptance or be
         able to compete effectively in the pharmaceutical industry.
Building a catalog of affordable medicines, page 270

18.      We note your projection that Aumolertinib (EQ143) and Sugemalimab
(EQ165, also
         known as CS1001) are targeting an expected $40 billion drug spend in
2026 and that
         Sugemalimab is expected to see an incremental $20 billion in drug
spend in 2026 beyond
         your initial indications. Please provide additional information
regarding your basis and the
         underlying assumptions of these projections.

19.      We note that you include multiple undisclosed programs in the
Pre-Clinical and Drug
         Engineering columns of your pipeline table. To the extent that these
programs are
         material, please identify the undisclosed product candidates in the
pipeline table. If they
         are not material, please remove them. Please also revise the pipeline
table to include
         columns for Phase 1, 2, and 3 clinical trials and indicate the phase
of development for
         aumolertinib, sugemalimab, lerociclib, EQ176 and EQ121. Please also
disclose whether
         you have INDs for each of these product candidates.
Additional information on our pipeline programs, page 276

20.      You make numerous references to the safety and efficacy of EQRx's
products throughout
         the disclosure. Efficacy and safety are determinations that are solely
within the authority
         of the FDA or similar foreign regulators. You may present clinical
trial end points and
         objective data resulting from trials without concluding efficacy, and
you may state that
         your product candidates are well tolerated if true. Please revise any
         statements referencing safety and efficacy as appropriate.
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21.      We note your discussions of multiple clinical trials, including those
testing Aumolertinib
         (EQ143), Sugemalimab (EQ165), Lerociclib (EQ132), EQ176, and EQ121.
Please expand
         your discussions of each of these clinical trials, to include:
             The primary and secondary endpoints of the trial;
             Whether or not the data from the trial was found to be
statistically significant
             (including the P-value); and
             Whether any SAEs or AEs have occurred that are linked to treatment
(and the nature
             and amount of any such SAEs or AEs).
Intellectual Property, page 287

22.      We note in your Patent Portfolio section that your Aumolertinib
(EQ143), Sugemalimab
         (EQ165), Lerociclib, EQ176, and EQ121 patent families also include
cases that are
         pending and granted in other major jurisdictions. Please revise this
section to specifically
         identify all material foreign jurisdictions where patents are granted
or patent applications
         are pending and also include the patent expiration dates and expected
expiration dates for
         pending patent applications for each material foreign jurisdiction.
Beneficial Ownership of the Securities, page 381

23.      We note that your disclosed potential ownership interest does not take
into account (a) the
         Public Warrants and Private Placement Warrants that will remain
outstanding
         immediately following the Business Combination and may be exercised
thereafter, (b) the
         Earn-Out Shares, (c) the issuance of any share upon completion of the
Business
         Combination under the 2021 Incentive Plan or the ESPP, or (d) the
portion of
         the Closing Merger Consideration that will be allocated to shares
underlying options to
         acquire EQRx stock (totaling, in aggregate, assuming full usage of
EQRx   s existing equity
         pool before completion of the Business Combination and after giving
effect to
         the estimated exchange ratio, 26,254,693 shares of CMLS III Class A
common stock) that
         may be exercised in the future. Please disclose the sponsor and its
affiliates    total potential
         ownership interest in the combined company, assuming exercise and
conversion of all
         securities.
Certain Material U.S. Federal Income Tax Considerations, page 391

24.      Please have counsel provide a tax opinion addressing the tax
consequences to U.S. holders
         of CMLS III Class A common stock who exercise redemption rights and
who hold shares
         at the time of the Business Combination. The tax opinion should
address and express a
         conclusion for each material federal tax consequence. For additional
guidance concerning
         assumptions and opinions subject to uncertainty, refer to Staff Legal
Bulletin No. 19.
Exhibits

25.      Please file the licensing and collaboration agreements with Hansoh and
the drug
         engineering collaboration agreements with Exscientia, AbCellera, and
Relay Therapeutics
         as exhibits to the registration statement or explain the basis for
your determination that
 Eli Casdin
CM Life Sciences III Inc.
September 24, 2021
Page 6
      they are not required to be filed.
        We remind you that the company and its management are responsible for
the accuracy
and adequacy of their disclosures, notwithstanding any review, comments, action
or absence of
action by the staff.

       Refer to Rules 460 and 461 regarding requests for acceleration. Please
allow adequate
time for us to review any amendment prior to the requested effective date of
the registration
statement.

       You may contact Kevin Vaughn at 202-551-3494 or Ibolya Ignat at
202-551-3636 if you
have questions regarding comments on the financial statements and related
matters. Please
contact Jordan Nimitz at 202-551-6001 or Christopher Edwards at 202-551-6761
with any other
questions.



                                                           Sincerely,
FirstName LastNameEli Casdin
                                                           Division of
Corporation Finance
Comapany NameCM Life Sciences III Inc.
                                                           Office of Life
Sciences
September 24, 2021 Page 6
cc:       Joel Rubinstein, Esq.
FirstName LastName