September 18, 2019

David M. Epstein
Chief Executive Officer
Black Diamond Therapeutics, Inc.
139 Main Street
Cambridge, MA 02142

       Re: Black Diamond Therapeutics, Inc.
           Draft Registration Statement on Form S-1
           Submitted August 23, 2019
           File No. 377-02808

Dear Dr. Epstein:

       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

Our pipleline, page 3

1.     Please refer to the "Discovery," "Optimization" and "IND-enabling"
columns. Please
       advise how "IND-enabling" differs from pre-clinical. Additionally,
please advise what is
       the difference between "Discovery" and "Optimization." To the extent you
retain these
       columns rather than just "Discovery" and "Pre-Clinical" columns, please
add detailed
       footnotes to the table to explain each development phase clearly so that
investors can
       appreciate the differences between the phases.
 David M. Epstein
FirstName LastNameDavid M.Inc.
Black Diamond Therapeutics, Epstein
Comapany 18, 2019
September NameBlack Diamond Therapeutics, Inc.
September 18, 2019 Page 2
Page 2
FirstName LastName
2.       For the BDTX-189 row in the pipeline table, please remove the "in
progress" bar from the
         Phase 1 column. In this regard, we note you disclose that you plan to
start a combined
         Phase 1/2 clinical trial in the first half of 2020, which implies that
Phase 1 testing has not
         yet commenced for this drug candidate. Please make a conforming
revision to the
         pipeline table in the business section of the prospectus.
Our BDTX-189 program, page 4

3.       Please refer to the included chart. We note your comparison to
approved drugs, erlotinib
         and osimertinib. Please tell us on what basis you believe you are able
to make these
         comparisons given your pre-clinical stage and the lack of any
head-to-head clinical trials
         or, alternatively, delete these comparisons.
Implications of being an emerging growth company, page 8

4.       Please supplementally 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.
Use of proceeds, page 87

5.       We note that the net proceeds will be used to fund the clinical
development of BDTX-189
         to include your planned Phase 1/2 clinical trial. Please revise your
disclosure to specify
         how far in the clinical development you expect to reach with the net
proceeds.
Critical accounting policies and significant judgments and estimates
Stock-based compensation
Determination of the fair value of common stock, page 108

6.       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 stock
leading up to the
         initial public offering and the estimated offering price. This
information will help facilitate
         our review of your accounting for equity issuances including stock
compensation and
         beneficial conversion features.
Choice of forum, page 181

7.       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 "derivative
         action." Please disclose whether this provision applies to actions
arising under the
         Securities Act. In that regard, we note that 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
 David M. Epstein
Black Diamond Therapeutics, Inc.
September 18, 2019
Page 3
         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.
General

8.       Please provide us mockups of any pages that include any additional
pictures or graphics
         to be presented, including any accompanying captions. Please keep in
mind, in
         scheduling your printing and distribution of the preliminary
prospectus, that we may have
         comments after our review of these materials.
       You may contact Sasha Parikh at 202-551-3627 or Kevin Vaughn at
202-551-3494 if you
have questions regarding comments on the financial statements and related
matters. Please
contact Donald Field at 202-551-3680 or Dietrich King at 202-551-8071 with any
other
questions.



FirstName LastNameDavid M. Epstein                            Sincerely,
Comapany NameBlack Diamond Therapeutics, Inc.
                                                              Division of
Corporation Finance
September 18, 2019 Page 3                                     Office of
Healthcare & Insurance
FirstName LastName