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                              May 1, 2020

       David Obstler
       Chief Financial Officer
       Datadog, Inc.
       620 8th Avenue, 45th Floor
       New York, NY 10018

                                                        Re: Datadog, Inc.
                                                            Form 10-K for the
Fiscal Year Ended December 31, 2019
                                                            Filed February 25,
2020
                                                            File No. 001-39051

       Dear Mr. Obstler:

              We have reviewed your filing 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 these comments within ten business days by
providing the requested
       information or advise us as soon as possible when you will respond. If
you do not believe our
       comments apply to your facts and circumstances, please tell us why in
your response.

                                                        After reviewing your
response to these comments, we may have additional comments.

       Form 10-K for the Fiscal Year Ended December 31, 2019

       Management's Discussion and Analysis of Financial Condition and Results
of Operations
       Factors Affecting Our Performance, page 38

   1.                                                   We note that your
results of operations are impacted, in part, by your ability to retain and
                                                        grow your existing
customers. Please tell us what measures are used to evaluate the
                                                        success of your
land-and-expand business model and what consideration you have given
                                                        to including a
quantified discussion of such metrics for each period presented. In this
                                                        regard, we note you
previously provided a dollar-based net retention rate. Refer to Item
                                                        303(a)(3) of Regulation
S-K and Section III.B.1 of SEC Release No. 33-8350. Refer also
                                                        to SEC Release
33-10751.
 David Obstler
FirstName LastNameDavid Obstler
Datadog, Inc.
Comapany NameDatadog, Inc.
May 1, 2020
Page 2
May 1, 2020 Page 2
FirstName LastName
2.       Please expand your disclosure to explain how management uses the
measure of the
         number of customers with ARR greater than $100,000 to analyze the
business and why
         disclosing this information is useful to investors. Also, to add
further context to such
         measure, please disclose the percentage of ARR generated from this
subset of customer
         for each period presented.
Results of Operations, page 42

3.       You state that revenue was primarily due to growth from existing
customers with the
         remaining attributable to new customers. Where a material change is
attributed to two or
         more factors, including any offsetting factors, please revise to
quantify the contribution of
         each identified factor and remove any vague terms such as "primarily"
in favor of specific
         quantification. Refer Section III.D of Release No. 33-6835.
        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.

       You may contact Eiko Yaoita Pyles, Staff Accountant, at 202-551-3587 or
Kathleen
Collins, Accounting Branch Chief, at 202-551-3499 with any questions.



                                                                Sincerely,

                                                                Division of
Corporation Finance
                                                                Office of
Technology