Document:

EX-10.4

 Exhibit 10.4 

DATADOG, INC. 

2019 EMPLOYEE STOCK PURCHASE PLAN 

ADOPTED BY THE BOARD OF DIRECTORS:
SEPTEMBER 6, 2019 
 APPROVED BY THE STOCKHOLDERS:
SEPTEMBER 6, 2019 
 IPO DATE:
                        , 2019 

1. GENERAL; PURPOSE. 

(a) The Plan provides a means by which Eligible Employees of the Company and certain designated Related Corporations may be given an
opportunity to purchase shares of Class A Common Stock. The Plan permits the Company to grant a series of Purchase Rights to Eligible Employees under an Employee Stock Purchase Plan. In addition, the Plan permits the Company to grant a series
of Purchase Rights to Eligible Employees that do not meet the requirements of an Employee Stock Purchase Plan. 
 (b) The Plan
includes two components: a 423 Component and a Non-423 Component. The Company intends (but makes no undertaking or representation to maintain) the 423 Component to qualify as an Employee Stock Purchase Plan.
The provisions of the 423 Component, accordingly, will be construed in a manner that is consistent with the requirements of Section 423 of the Code. Except as otherwise provided in the Plan or determined by the Board, the Non-423 Component will operate and be administered in the same manner as the 423 Component. 
 (c)
The Company, by means of the Plan, seeks to retain the services of such Employees, to secure and retain the services of new Employees and to provide incentives for such persons to exert maximum efforts for the success of the Company and its
Related Corporations. 
 2. ADMINISTRATION. 

(a) The Board or the Committee will administer the Plan. References herein to the Board shall be deemed to refer to the Committee except
where context dictates otherwise. 
 (b) The Board will have the power, subject to, and within the limitations of, the express
provisions of the Plan: 
 (i) To determine how and when Purchase Rights will be granted and the provisions of each Offering (which
need not be identical). 
 (ii) To designate from time to time (A) which Related Corporations of the Company will be eligible to
participate in the Plan, (B) whether such Related Corporations will participate in the 423 Component or the Non-423 Component, and (C) to the extent that the Company makes separate Offerings under
the 423 Component, in which Offering the Related Corporations in the 423 Component will participate. 
 (iii) To construe and
interpret the Plan and Purchase Rights, and to establish, amend and revoke rules and regulations for its administration. The Board, in the exercise of this power, may correct any defect, omission or inconsistency in the Plan, in a manner and to the
extent it deems necessary or expedient to make the Plan fully effective. 
  

 (iv) To settle all controversies regarding the Plan and Purchase Rights granted under
the Plan. 
 (v) To suspend or terminate the Plan at any time as provided in Section 12. 

(vi) To amend the Plan at any time as provided in Section 12. 

(vii) Generally, to exercise such powers and to perform such acts as it deems necessary or expedient to promote the best interests of
the Company and its Related Corporations and to carry out the intent that the Plan be treated as an Employee Stock Purchase Plan with respect to the 423 Component. 

(viii) To adopt such rules, procedures and sub-plans as are necessary or appropriate to permit
or facilitate participation in the Plan by Employees who are foreign nationals or employed or located outside the United States. Without limiting the generality of, and consistent with, the foregoing, the Board specifically is authorized to adopt
rules, procedures, and sub-plans regarding, without limitation, eligibility to participate in the Plan, the definition of eligible “earnings,” handling and making of Contributions, establishment of
bank or trust accounts to hold Contributions, payment of interest, conversion of local currency, obligations to pay payroll tax, determination of beneficiary designation requirements, withholding procedures and handling of share issuances, any of
which may vary according to applicable requirements, and which, if applicable to a Related Corporation designated for participation in the Non-423 Component, do not have to comply with the requirements of
Section 423 of the Code. 
 (c) The Board may delegate some or all of the administration of the Plan to a Committee or
Committees. If administration is delegated to a Committee, the Committee will have, in connection with the administration of the Plan, the powers theretofore possessed by the Board that have been delegated to the Committee, including the power to
delegate to a subcommittee any of the administrative powers the Committee is authorized to exercise (and references in this Plan to the Board will thereafter be to the Committee or subcommittee), subject, however, to such resolutions, not
inconsistent with the provisions of the Plan, as may be adopted from time to time by the Board. The Board may retain the authority to concurrently administer the Plan with the Committee and may, at any time, revest in the Board some or all of the
powers previously delegated. Whether or not the Board has delegated administration of the Plan to a Committee, the Board will have the final power to determine all questions of policy and expediency that may arise in the administration of the Plan.

 (d) All determinations, interpretations and constructions made by the Board in good faith will not be subject to review by any
person and will be final, binding and conclusive on all persons. 
 3. SHARES OF CLASS A
COMMON STOCK SUBJECT TO THE PLAN. 
 (a)
Subject to the provisions of Section 11(a) relating to Capitalization Adjustments, the maximum number of shares of Class A Common Stock that may be issued under the Plan will not exceed 6,725,000 shares of Class A Common Stock,
plus the number of shares of Class A Common Stock that are automatically added on January 1st of each year for a period of up to ten years, commencing on the first January 1 following
the year in which the IPO Date occurs and ending on (and including) January 1, 2029, in an amount equal to the lesser of (i) 1% of the total number of shares of Capital Stock outstanding on December 31st of the preceding calendar year, and (ii) 10,087,500 shares of Class A Common Stock. Notwithstanding the foregoing, the Board may act prior to the first day of any calendar year to provide that
there will be no January 1st increase in the share reserve for such calendar year or that the increase in the share reserve for such calendar year will be a lesser number of shares of Class A
Common Stock than would otherwise occur pursuant to the preceding sentence. For the avoidance of doubt, up to the 

  
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maximum number of shares of Class A Common Stock reserved under this Section 3(a) may be used to satisfy purchases of Class A Common Stock under the 423 Component and any remaining
portion of such maximum number of shares may be used to satisfy purchases of Class A Common Stock under the Non-423 Component. 

(b) If any Purchase Right granted under the Plan terminates without having been exercised in full, the shares of Class A Common
Stock not purchased under such Purchase Right will again become available for issuance under the Plan. 
 (c) The stock purchasable
under the Plan will be shares of authorized but unissued or reacquired Class A Common Stock, including shares repurchased by the Company on the open market. 

4. GRANT OF PURCHASE RIGHTS; OFFERING. 

(a) The Board may from time to time grant or provide for the grant of Purchase Rights to Eligible Employees under an Offering
(consisting of one or more Purchase Periods) on an Offering Date or Offering Dates selected by the Board. Each Offering will be in such form and will contain such terms and conditions as the Board will deem appropriate, and, with respect to the 423
Component, will comply with the requirement of Section 423(b)(5) of the Code that all Employees granted Purchase Rights will have the same rights and privileges. The terms and conditions of an Offering shall be incorporated by reference into
the Plan and treated as part of the Plan. The provisions of separate Offerings need not be identical, but each Offering will include (through incorporation of the provisions of this Plan by reference in the document comprising the Offering or
otherwise) the period during which the Offering will be effective, which period will not exceed 27 months beginning with the Offering Date, and the substance of the provisions contained in Sections 5 through 8, inclusive. 

(b) If a Participant has more than one Purchase Right outstanding under the Plan, unless he or she otherwise indicates in forms
delivered to the Company: (i) each form will apply to all of his or her Purchase Rights under the Plan, and (ii) a Purchase Right with a lower exercise price (or an earlier-granted Purchase Right, if different Purchase Rights have
identical exercise prices) will be exercised to the fullest possible extent before a Purchase Right with a higher exercise price (or a later-granted Purchase Right if different Purchase Rights have identical exercise prices) will be exercised. 

(c) The Board will have the discretion to structure an Offering so that if the Fair Market Value of a share of Class A Common Stock
on the first Trading Day of a new Purchase Period within that Offering is less than or equal to the Fair Market Value of a share of Class A Common Stock on the Offering Date for that Offering, then (i) that Offering will terminate
immediately as of that first Trading Day, and (ii) the Participants in such terminated Offering will be automatically enrolled in a new Offering beginning on the first Trading Day of such new Purchase Period. 

5. ELIGIBILITY. 
 (a)
Purchase Rights may be granted only to Employees of the Company or, as the Board may designate in accordance with Section 2(b), to Employees of a Related Corporation. Except as provided in Section 5(b) or as required by Applicable Law,
an Employee will not be eligible to be granted Purchase Rights unless, on the Offering Date, the Employee has been in the employ of the Company or the Related Corporation, as the case may be, for such continuous period preceding such Offering Date
as the Board may require, but in no event will the required period of continuous employment be equal to or greater than two years. In addition, the Board may (unless prohibited by law) provide that no Employee will be eligible to be granted Purchase
Rights under the Plan unless, on the Offering Date, such Employee’s customary employment with the Company or the Related Corporation is more than 20 hours per week and 

  
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more than five months per calendar year or such other criteria as the Board may determine consistent with Section 423 of the Code with respect to the 423 Component. The Board may also
exclude from participation in the Plan or any Offering Employees who are “highly compensated employees” (within the meaning of Section 423(b)(4)(D) of the Code) of the Company or a Related Corporation or a subset of such highly
compensated employees. 
 (b) The Board may provide that each person who, during the course of an Offering, first becomes an Eligible
Employee will, on a date or dates specified in the Offering which coincides with the day on which such person becomes an Eligible Employee or which occurs thereafter, receive a Purchase Right under that Offering, which Purchase Right will thereafter
be deemed to be a part of that Offering. Such Purchase Right will have the same characteristics as any Purchase Rights originally granted under that Offering, as described herein, except that: 

(i) the date on which such Purchase Right is granted will be the “Offering Date” of such Purchase Right for all purposes,
including determination of the exercise price of such Purchase Right; 
 (ii) the period of the Offering with respect to such Purchase
Right will begin on its Offering Date and end coincident with the end of such Offering; and 
 (iii) the Board may provide that if
such person first becomes an Eligible Employee within a specified period of time before the end of the Offering, he or she will not receive any Purchase Right under that Offering. 

(c) No Employee will be eligible for the grant of any Purchase Rights if, immediately after any such Purchase Rights are granted, such
Employee owns stock possessing five percent or more of the total combined voting power or value of all classes of stock of the Company or of any Related Corporation. For purposes of this Section 5(c), the rules of Section 424(d) of the
Code will apply in determining the stock ownership of any Employee, and stock which such Employee may purchase under all outstanding Purchase Rights and options will be treated as stock owned by such Employee. 

(d) As specified by Section 423(b)(8) of the Code, an Eligible Employee may be granted Purchase Rights only if such Purchase
Rights, together with any other rights granted under all Employee Stock Purchase Plans of the Company and any Related Corporations, do not permit such Eligible Employee’s rights to purchase stock of the Company or any Related Corporation to
accrue at a rate which, when aggregated, exceeds US $25,000 of Fair Market Value of such stock (determined at the time such rights are granted, and which, with respect to the Plan, will be determined as of their respective Offering Dates) for each
calendar year in which such rights are outstanding at any time. 
 (e) Officers of the Company and any designated Related Corporation,
if they are otherwise Eligible Employees, will be eligible to participate in Offerings under the Plan. Notwithstanding the foregoing, the Board may (unless prohibited by law) provide in an Offering that Employees who are highly compensated Employees
within the meaning of Section 423(b)(4)(D) of the Code will not be eligible to participate. 
 (f) Notwithstanding anything in
this Section 5 to the contrary, in the case of an Offering under the Non-423 Component, an Eligible Employee (or group of Eligible Employees) may be excluded from participation in the Plan or an Offering
if the Board has determined, in its sole discretion, that participation of such Eligible Employee(s) is not advisable or practical for any reason. 

  
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 6. PURCHASE RIGHTS; PURCHASE PRICE. 

(a) On each Offering Date, each Eligible Employee, pursuant to an Offering made under the Plan, will be granted a Purchase Right to
purchase up to that number of shares of Class A Common Stock purchasable either with a percentage or with a maximum dollar amount, as designated by the Board, but in either case not exceeding 15% of such Employee’s earnings (as defined by
the Board in each Offering) during the period that begins on the Offering Date (or such later date as the Board determines for a particular Offering) and ends on the date stated in the Offering, which date will be no later than the end of the
Offering. 
 (b) The Board will establish one or more Purchase Dates during an Offering on which Purchase Rights granted for that
Offering will be exercised and shares of Class A Common Stock will be purchased in accordance with such Offering. 
 (c) In
connection with each Offering made under the Plan, the Board may specify (i) a maximum number of shares of Class A Common Stock that may be purchased by any Participant on any Purchase Date during such Offering, (ii) a maximum
aggregate number of shares of Class A Common Stock that may be purchased by all Participants pursuant to such Offering and/or (iii) a maximum aggregate number of shares of Class A Common Stock that may be purchased by all Participants
on any Purchase Date under the Offering. If the aggregate purchase of shares of Class A Common Stock issuable upon exercise of Purchase Rights granted under the Offering would exceed any such maximum aggregate number, then, in the absence of
any Board action otherwise, a pro rata (based on each Participant’s accumulated Contributions) allocation of the shares of Class A Common Stock (rounded down to the nearest whole share) available will be made in as nearly a uniform manner
as will be practicable and equitable. 
 (d) The purchase price of shares of Class A Common Stock acquired pursuant to Purchase
Rights will be not less than the lesser of: 
 (i) an amount equal to 85% of the Fair Market Value of the shares of Class A
Common Stock on the Offering Date; or 
 (ii) an amount equal to 85% of the Fair Market Value of the shares of Class A Common
Stock on the applicable Purchase Date. 
 7. PARTICIPATION; WITHDRAWAL; TERMINATION. 

(a) An Eligible Employee may elect to participate in an Offering and authorize payroll deductions as the means of making Contributions
by completing and delivering to the Company, within the time specified in the Offering, an enrollment form provided by the Company. The enrollment form will specify the amount of Contributions not to exceed the maximum amount specified by the Board.
Each Participant’s Contributions will be credited to a bookkeeping account for such Participant under the Plan and will be deposited with the general funds of the Company except where Applicable Law requires that Contributions be deposited with
a third party. If permitted in the Offering, a Participant may begin such Contributions with the first payroll occurring on or after the Offering Date (or, in the case of a payroll date that occurs after the end of the prior Offering but before the
Offering Date of the next new Offering, Contributions from such payroll will be included in the new Offering). If permitted in the Offering, a Participant may thereafter reduce (including to zero) or increase his or her Contributions. If required
under Applicable Law or if specifically provided in the Offering, in addition to or instead of making Contributions by payroll deductions, a Participant may make Contributions through the payment by cash, check or wire transfer prior to a Purchase
Date. 

  
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 (b) During an Offering, a Participant may cease making Contributions and withdraw
from the Offering by delivering to the Company a withdrawal form provided by the Company. The Company may impose a deadline before a Purchase Date for withdrawing. Upon such withdrawal, such Participant’s Purchase Right in that Offering will
immediately terminate and the Company will distribute as soon as practicable to such Participant all of his or her accumulated but unused Contributions and such Participant’s Purchase Right in that Offering shall thereupon terminate. A
Participant’s withdrawal from that Offering will have no effect upon his or her eligibility to participate in any other Offerings under the Plan, but such Participant will be required to deliver a new enrollment form to participate in
subsequent Offerings. 
 (c) Unless otherwise required by Applicable Law, Purchase Rights granted pursuant to any Offering under the
Plan will terminate immediately if the Participant either (i) is no longer an Employee for any reason or for no reason (subject to any post-employment participation period required by law) or (ii) is otherwise no longer eligible to
participate. The Company will distribute as soon as practicable to such individual all of his or her accumulated but unused Contributions. 

(d) Unless otherwise determined by the Board, a Participant whose employment transfers or whose employment terminates with an immediate
rehire (with no break in service) by or between the Company and a Related Corporation that has been designated for participation in the Plan will not be treated as having terminated employment for purposes of participating in the Plan or an
Offering; however, if a Participant transfers from an Offering under the 423 Component to an Offering under the Non-423 Component, the exercise of the Participant’s Purchase Right will be qualified under
the 423 Component only to the extent such exercise complies with Section 423 of the Code. If a Participant transfers from an Offering under the Non-423 Component to an Offering under the 423 Component,
the exercise of the Purchase Right will remain non-qualified under the Non-423 Component. The Board may establish different and additional rules governing transfers
between separate Offerings within the 423 Component and between Offerings under the 423 Component and Offerings under the Non-423 Component. 

(e) During a Participant’s lifetime, Purchase Rights will be exercisable only by such Participant. Purchase Rights are not
transferable by a Participant, except by will, by the laws of descent and distribution, or, if permitted by the Company, by a beneficiary designation as described in Section 10. 

(f) Unless otherwise specified in the Offering or as required by Applicable Law, the Company will have no obligation to pay interest on
Contributions. 
 8. EXERCISE OF PURCHASE RIGHTS. 

(a) On each Purchase Date, each Participant’s accumulated Contributions will be applied to the purchase of shares of Class A
Common Stock, up to the maximum number of shares of Class A Common Stock permitted by the Plan and the applicable Offering, at the purchase price specified in the Offering. No fractional shares will be issued unless specifically provided for in
the Offering. 
 (b) Unless otherwise provided in the Offering, if any amount of accumulated Contributions remains in a
Participant’s account after the purchase of shares of Class A Common Stock on the final Purchase Date of an Offering, then such remaining amount will not roll over to the next Offering and will instead be distributed in full to such
Participant after the final Purchase Date of such Offering without interest (unless otherwise required by Applicable Law). 

  
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 (c) No Purchase Rights may be exercised to any extent unless the shares of
Class A Common Stock to be issued upon such exercise under the Plan are covered by an effective registration statement pursuant to the Securities Act and the Plan is in material compliance with all applicable U.S. federal and state, foreign and
other securities, exchange control and other laws applicable to the Plan. If on a Purchase Date the shares of Class A Common Stock are not so registered or the Plan is not in such compliance, no Purchase Rights will be exercised on such
Purchase Date, and the Purchase Date will be delayed until the shares of Class A Common Stock are subject to such an effective registration statement and the Plan is in material compliance, except that the Purchase Date will in no event be more
than 27 months from the Offering Date. If, on the Purchase Date, as delayed to the maximum extent permissible, the shares of Class A Common Stock are not registered and the Plan is not in material compliance with all Applicable Laws, as
determined by the Company in its sole discretion, no Purchase Rights will be exercised and all accumulated but unused Contributions will be distributed to the Participants without interest (unless the payment of interest is otherwise required by
Applicable Law). 
 9. COVENANTS OF THE COMPANY. 

The Company will seek to obtain from each U.S. federal or state, foreign or other regulatory commission or agency having jurisdiction over the
Plan such authority as may be required to grant Purchase Rights and issue and sell shares of Class A Common Stock thereunder unless the Company determines, in its sole discretion, that doing so would cause the Company to incur costs that are
unreasonable. If, after commercially reasonable efforts, the Company is unable to obtain the authority that counsel for the Company deems necessary for the grant of Purchase Rights or the lawful issuance and sale of Class A Common Stock under
the Plan, and at a commercially reasonable cost, the Company will be relieved from any liability for failure to grant Purchase Rights and/or to issue and sell Class A Common Stock upon exercise of such Purchase Rights. 

10. DESIGNATION OF BENEFICIARY. 

(a) The Company may, but is not obligated to, permit a Participant to submit a form designating a beneficiary who will receive any
shares of Class A Common Stock and/or Contributions from the Participant’s account under the Plan if the Participant dies before such shares and/or Contributions are delivered to the Participant. The Company may, but is not obligated to,
permit the Participant to change such designation of beneficiary. Any such designation and/or change must be on a form approved by the Company. 

(b) If a Participant dies, and in the absence of a valid beneficiary designation, the Company will deliver any shares of Class A
Common Stock and/or Contributions to the executor or administrator of the estate of the Participant. If no executor or administrator has been appointed (to the knowledge of the Company), the Company, in its sole discretion, may deliver such shares
of Class A Common Stock and/or Contributions, without interest (unless the payment of interest is otherwise required by Applicable Law), to the Participant’s spouse, dependents or relatives, or if no spouse, dependent or relative is known
to the Company, then to such other person as the Company may designate. 
 11. ADJUSTMENTS UPON CHANGES
IN CLASS A COMMON STOCK; CORPORATE TRANSACTIONS. 

(a) In the event of a Capitalization Adjustment, the Board will appropriately and proportionately adjust: (i) the class(es) and
maximum number of securities subject to the Plan pursuant to Section 3(a), (ii) the class(es) and maximum number of securities by which the share reserve is to increase automatically each year pursuant to Section 3(a), (iii) the class(es)
and number of securities subject to, and the purchase price applicable to outstanding Offerings and Purchase Rights, and (iv) the class(es) and number of securities that are the subject of the purchase limits under each ongoing Offering. The
Board will make these adjustments, and its determination will be final, binding and conclusive. 

  
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 (b) In the event of a Corporate Transaction, then: (i) any surviving corporation
or acquiring corporation (or the surviving or acquiring corporation’s parent company) may assume or continue outstanding Purchase Rights or may substitute similar rights (including a right to acquire the same consideration paid to the
stockholders in the Corporate Transaction) for outstanding Purchase Rights, or (ii) if any surviving or acquiring corporation (or its parent company) does not assume or continue such Purchase Rights or does not substitute similar rights
for such Purchase Rights, then the Participants’ accumulated Contributions will be used to purchase shares of Class A Common Stock (rounded down to the nearest whole share) within ten business days prior to the Corporate Transaction under
the outstanding Purchase Rights, and the Purchase Rights will terminate immediately after such purchase. 
 12. AMENDMENT,
TERMINATION OR SUSPENSION OF THE PLAN. 

(a) The Board may amend the Plan at any time in any respect the Board deems necessary or advisable. However, except as provided in
Section 11(a) relating to Capitalization Adjustments, stockholder approval will be required for any amendment of the Plan for which stockholder approval is required by Applicable Law. 

(b) The Board may suspend or terminate the Plan at any time. No Purchase Rights may be granted under the Plan while the Plan is
suspended or after it is terminated. 
 Any benefits, privileges, entitlements and obligations under any outstanding Purchase Rights granted
before an amendment, suspension or termination of the Plan will not be materially impaired by any such amendment, suspension or termination except (i) with the consent of the person to whom such Purchase Rights were granted, (ii) as
necessary to comply with any laws, listing requirements, or governmental regulations (including, without limitation, the provisions of Section 423 of the Code and the regulations and other interpretive guidance issued thereunder relating to
Employee Stock Purchase Plans) including without limitation any such regulations or other guidance that may be issued or amended after the date the Plan is adopted by the Board, or (iii) as necessary to obtain or maintain favorable tax,
listing, or regulatory treatment. To be clear, the Board may amend outstanding Purchase Rights without a Participant’s consent if such amendment is necessary to ensure that the Purchase Right and/or the Plan complies with the requirements of
Section 423 of the Code with respect to the 423 Component or with respect to other Applicable Laws. Notwithstanding anything in the Plan or any Offering Document to the contrary, the Board will be entitled to: (i) establish the exchange
ratio applicable to amounts withheld in a currency other than U.S. dollars; (ii) permit Contributions in excess of the amount designated by a Participant in order to adjust for mistakes in the Company’s processing of properly completed
Contribution elections; (iii) establish reasonable waiting and adjustment periods and/or accounting and crediting procedures to ensure that amounts applied toward the purchase of Class A Common Stock for each Participant properly
correspond with amounts withheld from the Participant’s Contributions; (iv) amend any outstanding Purchase Rights or clarify any ambiguities regarding the terms of any Offering to enable the Purchase Rights to qualify under and/or comply
with Section 423 of the Code with respect to the 423 Component; and (v) establish other limitations or procedures as the Board determines in its sole discretion advisable that are consistent with the Plan. The actions of the Board pursuant
to this paragraph will not be considered to alter or impair any Purchase Rights granted under an Offering as they are part of the initial terms of each Offering and the Purchase Rights granted under each Offering. 

13. TAX QUALIFICATION; TAX WITHHOLDING. 

(a) Although the Company may endeavor to (i) qualify a Purchase Right for special tax treatment under the laws of the United States
or jurisdictions outside of the United States or (ii) avoid adverse tax treatment, the Company makes no representation to that effect and expressly disavows any covenant to maintain special or to avoid unfavorable tax treatment, notwithstanding
anything to the contrary in this Plan. The Company will be unconstrained in its corporate activities without regard to the potential negative tax impact on Participants. 

  
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 (b) Each Participant will make arrangements, satisfactory to the Company and any
applicable Related Corporation, to enable the Company or the Related Corporation to fulfill any withholding obligation for Tax-Related Items. Without limitation to the foregoing, in the Company’s sole
discretion and subject to Applicable Law, such withholding obligation may be satsified in whole or in part by (i) withholding from the Participant’s salary or any other cash payment due to the Participant from the Company or a Related
Corporation; (ii) withholding from the proceeds of the sale of shares of Class A Common Stock acquired under the Plan, either through a voluntary sale or a mandatory sale arranged by the Company; or (iii) any other method deemed
acceptable by the Board. 
 14. EFFECTIVE DATE OF PLAN. 

The Plan will become effective immediately prior to and contingent upon the IPO Date. No Purchase Rights will be exercised unless and until the
Plan has been approved by the stockholders of the Company, which approval must be within 12 months before or after the date the Plan is adopted (or if required under Section 12(a) above, materially amended) by the Board. 

15. MISCELLANEOUS PROVISIONS. 

(a) Proceeds from the sale of shares of Class A Common Stock pursuant to Purchase Rights will constitute general funds of the
Company. 
 (b) A Participant will not be deemed to be the holder of, or to have any of the rights of a holder with respect to, shares
of Class A Common Stock subject to Purchase Rights unless and until the Participant’s shares of Class A Common Stock acquired upon exercise of Purchase Rights are recorded in the books of the Company (or its transfer agent). 

(c) The Plan and Offering do not constitute an employment contract. Nothing in the Plan or in the Offering will in any way alter the at
will nature of a Participant’s employment, if applicable, or be deemed to create in any way whatsoever any obligation on the part of any Participant to continue in the employ of the Company or a Related Corporation, or on the part of the
Company or a Related Corporation to continue the employment of a Participant. 
 (d) The provisions of the Plan will be governed by
the laws of the State of Delaware without resort to that state’s conflicts of laws rules. 
 (e) If any particular provision of
the Plan is found to be invalid or otherwise unenforceable, such provision will not affect the other provisions of the Plan, but the Plan will be construed in all respects as if such invalid provision were omitted. 

(f) If any provision of the Plan does not comply with Applicable Law, such provision shall be construed in such a manner as to comply
with Applicable Law. 

  
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 16. DEFINITIONS. 

As used in the Plan, the following definitions will apply to the capitalized terms indicated below: 

(a) “423 Component” means the part of the Plan, which excludes the
Non-423 Component, pursuant to which Purchase Rights that satisfy the requirements for an Employee Stock Purchase Plan may be granted to Eligible Employees. 

(b) “Applicable Law” means shall mean any applicable securities, federal, state, foreign, material local or
municipal or other law, statute, constitution, principle of common law, resolution, ordinance, code, edict, decree, rule, listing rule, regulation, judicial decision, ruling or requirement issued, enacted, adopted, promulgated, implemented or
otherwise put into effect by or under the authority of any Governmental Body (or under the authority of the NASDAQ Stock Market or the Financial Industry Regulatory Authority). 

(c) “Board” means the Board of Directors of the Company. 

(d) “Capital Stock” means the Class A Common Stock and the Class B Common Stock. 

(e) “Capitalization Adjustment” means any change that is made in, or other events that occur with respect to,
the Class A Common Stock subject to the Plan or subject to any Purchase Right after the date the Plan is adopted by the Board without the receipt of consideration by the Company through merger, consolidation, reorganization, recapitalization,
reincorporation, stock dividend, dividend in property other than cash, large nonrecurring cash dividend, stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure or other similar equity
restructuring transaction, as that term is used in Financial Accounting Standards Board Accounting Standards Codification Topic 718 (or any successor thereto). Notwithstanding the foregoing, the conversion of any convertible securities of the
Company will not be treated as a Capitalization Adjustment. 
 (f) “Class A Common
Stock” means the Class A common stock of the Company. 
 (g) “Class B
Common Stock” means the Class B common stock of the Company. 
 (h) “Code” means the
U.S. Internal Revenue Code of 1986, as amended, including any applicable regulations and guidance thereunder. 
 (i)
“Committee” means a committee of one or more members of the Board to whom authority has been delegated by the Board in accordance with Section 2(c). 

(j) “Company” means Datadog, Inc., a Delaware corporation. 

(k) “Contributions” means the payroll deductions and other additional payments specifically provided for in the
Offering that a Participant contributes to fund the exercise of a Purchase Right. A Participant may make additional payments into his or her account if specifically provided for in the Offering, and then only if the Participant has not already had
the maximum permitted amount withheld during the Offering through payroll deductions. 
 (l) “Corporate
Transaction” means the consummation, in a single transaction or in a series of related transactions, of any one or more of the following events: 

(i) a sale or other disposition of all or substantially all, as determined by the Board in its sole discretion, of the
consolidated assets of the Company and its subsidiaries; 
 (ii) a sale or other disposition of more than 50% of the outstanding
securities of the Company; 

  
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 (iii) a merger, consolidation or similar transaction following which the Company is
not the surviving corporation; or 
 (iv) a merger, consolidation or similar transaction following which the Company is the surviving
corporation but the shares of Capital Stock outstanding immediately preceding the merger, consolidation or similar transaction are converted or exchanged by virtue of the merger, consolidation or similar transaction into other property, whether in
the form of securities, cash or otherwise. 
 (m) “Director” means a member of the Board. 

(n) “Eligible Employee” means an Employee who meets the requirements set forth in the document(s)
governing the Offering for eligibility to participate in the Offering, provided that such Employee also meets the requirements for eligibility to participate set forth in the Plan. 

(o) “Employee” means any person, including an Officer or Director, who is “employed” for
purposes of Section 423(b)(4) of the Code by the Company or a Related Corporation. However, service solely as a Director, or payment of a fee for such services, will not cause a Director to be considered an “Employee” for purposes of
the Plan. 
 (p) “Employee Stock Purchase Plan” means a plan that grants Purchase Rights intended to be
options issued under an “employee stock purchase plan,” as that term is defined in Section 423(b) of the Code. 
 (q)
“Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended and the rules and regulations promulgated thereunder. 

(r) “Fair Market Value” means, as of any date, the value of the Class A Common Stock determined as follows:

 (i) If the Class A Common Stock is listed on any established stock exchange or traded on any established market, the Fair
Market Value of a share of Class A Common Stock will be the closing sales price for such stock as quoted on such exchange or market (or the exchange or market with the greatest volume of trading in the Class A Common Stock) on the date of
determination, as reported in such source as the Board deems reliable. Unless otherwise provided by the Board, if there is no closing sales price for the Class A Common Stock on the date of determination, then the Fair Market Value will be the
closing sales price on the last preceding date for which such quotation exists. 
 (ii) In the absence of such markets for the
Class A Common Stock, the Fair Market Value will be determined by the Board in good faith in compliance with Applicable Laws and regulations and in a manner that complies with Sections 409A of the Code 

(iii) Notwithstanding the foregoing, for any Offering that commences on the IPO Date, the Fair Market Value of the shares of
Class A Common Stock on the Offering Date will be the price per share at which shares are first sold to the public in the Company’s initial public offering as specified in the final prospectus for that initial public offering. 

(s) “Governmental Body” means any: (a) nation, state, commonwealth, province,
territory, county, municipality, district or other jurisdiction of any nature; (b) federal, state, local, municipal, foreign or other government; (c) governmental or regulatory body, or quasi-governmental body of any nature (including any
governmental division, department, administrative agency or bureau, commission, authority, instrumentality, official, ministry, fund, foundation, center, organization, unit, body or entity and any court or other tribunal, and for the avoidance of
doubt, any tax authority) or other body exercising similar powers or authority; or (d) self-regulatory organization (including the NASDAQ Stock Market and the Financial Industry Regulatory Authority). 

  
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 (t) “IPO Date” means the date of the underwriting
agreement between the Company and the underwriters managing the initial public offering of the Class A Common Stock, pursuant to which the Class A Common Stock is priced for the initial public offering. 

(u) “Non-423 Component” means the part of the Plan, which excludes the
423 Component, pursuant to which Purchase Rights that are not intended to satisfy the requirements for an Employee Stock Purchase Plan may be granted to Eligible Employees. 

(v) “Offering” means the grant to Eligible Employees of Purchase Rights, with the exercise of those
Purchase Rights automatically occurring at the end of one or more Purchase Periods. The terms and conditions of an Offering will generally be set forth in the “Offering Document” approved by the Board for that Offering. 

(w) “Offering Date” means a date selected by the Board for an Offering to commence. 

(x) “Officer” means a person who is an officer of the Company or a Related Corporation within the
meaning of Section 16 of the Exchange Act. 
 (y) “Participant” means an Eligible Employee who
holds an outstanding Purchase Right. 
 (z) “Plan” means this Datadog, Inc. 2019 Employee Stock
Purchase Plan, as amended from time to time, including both the 423 Component and the Non-423 Component. 

(aa) “Purchase Date” means one or more dates during an Offering selected by the Board on which Purchase
Rights will be exercised and on which purchases of shares of Class A Common Stock will be carried out in accordance with such Offering. 

(bb) “Purchase Period” means a period of time specified within an Offering, generally beginning on the Offering
Date or on the first Trading Day following a Purchase Date, and ending on a Purchase Date. An Offering may consist of one or more Purchase Periods. 

(cc) “Purchase Right” means an option to purchase shares of Class A Common Stock granted pursuant to
the Plan. 
 (dd) “Related Corporation” means any “parent corporation” or “subsidiary
corporation” of the Company whether now or subsequently established, as those terms are defined in Sections 424(e) and (f), respectively, of the Code. 

(ee) “Securities Act” means the U.S. Securities Act of 1933, as amended. 

(ff) “Tax-Related Items” means any income tax, social insurance, payroll
tax, fringe benefit tax, payment on account or other tax-related items arising out of or in relation to a Participant’s participation in the Plan, including, but not limited to, the exercise of a Purchase
Right and the receipt of shares of Class A Common Stock or the sale or other disposition of shares of Class A Common Stock acquired under the Plan. 

  
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 (gg) “Trading Day” means any day on which the
exchange(s) or market(s) on which shares of Class A Common Stock are listed, including but not limited to the NYSE, Nasdaq Global Select Market, the Nasdaq Global Market, the Nasdaq Capital Market or any successors thereto, is open for trading.

  
 13EX-10.5

 Exhibit 10.5 

DATADOG, INC. 

INDEMNIFICATION AGREEMENT 

This INDEMNIFICATION AGREEMENT (this “Agreement”) is dated as of
                    , 20     and is between Datadog, Inc., a Delaware corporation (the “Company”), and
                     (“Indemnitee”). 

RECITALS 

A.    Indemnitee’s service to the Company substantially benefits the Company. 

B.    Individuals are reluctant to serve as directors or officers of corporations or in certain other capacities
unless they are provided with adequate protection through insurance or indemnification against the risks of claims and actions against them arising out of such service. 

C.    Indemnitee does not regard the protection currently provided by applicable law, the Company’s governing
documents and any insurance as adequate under the present circumstances, and Indemnitee may not be willing to serve as a director or officer without additional protection. 

D.    In order to induce Indemnitee to continue to provide services to the Company, it is reasonable, prudent and
necessary for the Company to contractually obligate itself to indemnify, and to advance expenses on behalf of, Indemnitee as permitted by applicable law. 

E.    This Agreement is a supplement to and in furtherance of the indemnification provided in the Company’s
certificate of incorporation and bylaws, and any resolutions adopted pursuant thereto, and this Agreement shall not be deemed a substitute therefor, nor shall this Agreement be deemed to limit, diminish or abrogate any rights of Indemnitee
thereunder. 
 AGREEMENT 

The parties agree as follows: 

1.    Definitions. 

(a)    “Beneficial Owner” shall have the meaning given to such term in Rule 13d-3 under the Securities Exchange Act of 1934, as amended; provided, however, that “Beneficial Owner” shall exclude any Person otherwise becoming a Beneficial Owner solely by reason of (i) the
stockholders of the Company approving a merger of the Company with another Person, or entering into tender or support agreements relating thereto, provided such merger was approved by the Company’s board of directors, or (ii) the
Company’s board of directors approving a sale of securities by the Company to such Person. 
 (b)    A
“Change in Control” shall be deemed to occur upon the earliest to occur after the date of this Agreement of any of the following events: 

(i)    Acquisition of Stock by Third Party. Any Person (as defined below) becomes the Beneficial Owner (as
defined below), directly or indirectly, of securities of the Company representing 50% or more of the combined voting power of the Company’s then outstanding securities; 

  
 1 

 (ii)    Change in Board Composition. During any period of
two consecutive years (not including any period prior to the execution of this Agreement), individuals who at the beginning of such period constituted the Company’s board of directors and any Approved Directors cease for any reason to
constitute a majority of the members of the Company’s board of directors. “Approved Directors” means new directors whose election or nomination by the board of directors was approved by a vote of at least two thirds of
the directors then still in office who either were directors at the beginning of such two-year period or whose election or nomination for election was previously so approved; or 

(iii)    Corporate Transactions. The effective date of a merger or consolidation of the Company with any
other entity, other than a merger or consolidation that would result in the voting securities of the Company outstanding immediately prior to such merger or consolidation continuing to represent (either by remaining outstanding or by being converted
into voting securities of the surviving entity) more than 50% of the combined voting power of the voting securities of the surviving entity outstanding immediately after such merger or consolidation and with the power to elect a majority of the
board of directors or other governing body of such surviving entity. 
 (c)    “Corporate
Status” describes the status of a person who is or was a director, trustee, general partner, managing member, officer, employee, agent or fiduciary of the Company or any other Enterprise. 

(d)    “DGCL” means the General Corporation Law of the State of Delaware. 

(e)    “Disinterested Director” means a director of the Company who is not and was not a
party to the Proceeding in respect of which indemnification is sought by Indemnitee. 

(f)    “Enterprise” means the Company and any other corporation, partnership, limited
liability company, joint venture, trust, employee benefit plan or other enterprise of which Indemnitee is or was serving at the request of the Company as a director, trustee, general partner, managing member, officer, employee, agent or fiduciary.

 (g)    “Expenses” include all reasonably and actually incurred attorneys’ fees,
retainers, court costs, transcript costs, fees and costs of experts, witness fees, travel expenses, duplicating costs, printing and binding costs, telephone charges, postage, delivery service fees, and all other disbursements or expenses of the
types customarily incurred in connection with prosecuting, defending, preparing to prosecute or defend, investigating, being or preparing to be a witness in, or otherwise participating in, a Proceeding. Expenses also include (i) Expenses
incurred in connection with any appeal resulting from any Proceeding, including without limitation the premium, security for, and other costs relating to any cost bond, supersede as bond or other appeal bond or their equivalent, and (ii) for
purposes of Section 10(d), Expenses incurred by Indemnitee in connection with the interpretation, enforcement or defense of Indemnitee’s rights under this Agreement or under any directors’ and officers’ liability insurance
policies maintained by the Company. Expenses, however, shall not include amounts paid in settlement by Indemnitee or the amount of judgments or fines against Indemnitee. 

(h)     “Independent Counsel” means a law firm, or a partner or member of a law firm, that
is experienced in matters of corporation law and neither presently is, nor in the past five years has been, retained to represent (i) the Company, any Enterprise or Indemnitee in any matter material to any such party (other than as Independent
Counsel with respect to matters concerning Indemnitee under this Agreement, or other indemnitees under similar indemnification agreements), or (ii) any other party to the Proceeding giving rise to a claim for indemnification hereunder.
Notwithstanding the foregoing, the term Independent Counsel shall not include any person who, under the applicable standards of professional conduct then prevailing, would have a conflict of interest in representing either the Company or Indemnitee
in an action to determine Indemnitee’s rights under this Agreement. 

  
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 (i)    “Person” shall have the meaning
used for such term in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended; provided, however, that Person shall exclude (i) the Company, (ii) any trustee or other fiduciary holding securities under an employee
benefit plan of the Company, and (iii) any corporation owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of stock of the Company. 

(j)    “Proceeding” means any threatened, pending or completed action, suit, arbitration,
mediation, alternate dispute resolution mechanism, investigation, inquiry, administrative hearing or proceeding, whether brought in the right of the Company or otherwise and whether of a civil, criminal, administrative or investigative nature,
whether formal or informal, including any appeal therefrom and including without limitation any such Proceeding pending as of the date of this Agreement, in which Indemnitee was, is or will be involved as a party, a potential party, a non-party witness or otherwise by reason of (i) the fact that Indemnitee is or was a director or officer of the Company, (ii) any action taken by Indemnitee or any action or inaction on Indemnitee’s
part while acting as a director or officer of the Company, or (iii) the fact that he or she is or was serving at the request of the Company as a director, trustee, general partner, managing member, officer, employee, agent or fiduciary of the
Company or any other Enterprise, in each case whether or not serving in such capacity at the time any liability or Expense is incurred for which indemnification or advancement of expenses can be provided under this Agreement. 

(k)    “to the fullest extent permitted by applicable law” means to the fullest extent
permitted by all applicable laws, including without limitation: (i) the fullest extent permitted by DGCL as of the date of this Agreement and (ii) the fullest extent authorized or permitted by any amendments to or replacements of the DGCL
adopted after the date of this Agreement that increase the extent to which a corporation may indemnify its officers and directors. 

(l)    In connection with any Proceeding relating to an employee benefit plan: references to
“fines” shall include any excise taxes assessed on a person with respect to any employee benefit plan; references to “serving at the request of the Company” shall include any service as a director,
officer, employee or agent of the Company which imposes duties on, or involves services by, such director, officer, employee or agent with respect to an employee benefit plan, its participants or beneficiaries; and a person who acted in good faith
and in a manner he or she reasonably believed to be in the best interests of the participants and beneficiaries of an employee benefit plan shall be deemed to have acted in a manner “not opposed to the best interests of the
Company” as referred to in this Agreement. 
 2.    Indemnity in Third-Party Proceedings. The
Company shall indemnify Indemnitee in accordance with the provisions of this Section 2 if Indemnitee is, or is threatened to be made, a party to or witness or other participant in any Proceeding, other than a Proceeding by or in the right of
the Company to procure a judgment in its favor. Pursuant to this Section 2, Indemnitee shall be indemnified to the fullest extent permitted by applicable law against all Expenses, judgments, fines and amounts paid in settlement actually and
reasonably incurred by Indemnitee or on his or her behalf in connection with such Proceeding or any claim, issue or matter therein, if Indemnitee acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the best
interests of the Company and, with respect to any criminal action or proceeding, had no reasonable cause to believe that his or her conduct was unlawful. 

3.    Indemnity in Proceedings by or in the Right of the Company. The Company shall indemnify Indemnitee in
accordance with the provisions of this Section 3 if Indemnitee is, or is threatened to be made, a party to or a witness or other participant in any Proceeding by or in the right of the Company to procure a judgment in its favor. Pursuant to
this Section 3, Indemnitee shall be indemnified to the fullest 

  
 3 

 
extent permitted by applicable law against all Expenses incurred by Indemnitee or on his or her behalf in connection with such Proceeding or any claim, issue or matter therein, if Indemnitee
acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of the Company. No indemnification for Expenses shall be made under this Section 3 in respect of any claim, issue or matter as to
which Indemnitee shall have been adjudged by a court of competent jurisdiction to be liable to the Company, unless and only to the extent that the Delaware Court of Chancery or any court in which the Proceeding was brought shall determine upon
application that, despite the adjudication of liability but in view of all the circumstances of the case, Indemnitee is fairly and reasonably entitled to indemnification for such expenses as the Delaware Court of Chancery or such other court shall
deem proper. 
 4.    Indemnification for Expenses of a Party Who is wholly or partly Successful. To the
extent that Indemnitee is a party to, and is successful (on the merits or otherwise) in defense of, any Proceeding or any claim, issue or matter therein, the Company shall indemnify Indemnitee against all Expenses incurred by Indemnitee or on
Indemnitee’s behalf in connection therewith. For purposes of this Section 4, the termination of any claim, issue or matter in such a Proceeding by dismissal, with or without prejudice, shall be deemed to be a successful result as to such
claim, issue or matter. 
 5.    Exclusions. Notwithstanding any provision in this Agreement, the Company
shall not be obligated under this Agreement to make any indemnity in connection with any Proceeding (or any part of any Proceeding): 

(a)    for which payment has actually been made to or on behalf of Indemnitee under any statute, insurance policy,
indemnity provision, vote or otherwise, except with respect to any excess beyond the amount paid; 
 (b)    for
an accounting or disgorgement of profits pursuant to Section 16(b) of the Securities Exchange Act of 1934, as amended, or similar provisions of federal, state or local statutory law or common law, if Indemnitee is held liable therefor
(including pursuant to any settlement arrangements); 
 (c)    for any reimbursement of the Company by Indemnitee
of any bonus or other incentive-based or equity-based compensation or of any profits realized by Indemnitee from the sale of securities of the Company, as required in each case under the Securities Exchange Act of 1934, as amended (including any
such reimbursements that arise from an accounting restatement of the Company pursuant to Section 304 of the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”), or the payment to the Company of profits arising from the
purchase and sale by Indemnitee of securities in violation of Section 306 of the Sarbanes-Oxley Act), if Indemnitee is held liable therefor (including pursuant to any settlement arrangements); 

(d)    initiated by Indemnitee, including any Proceeding (or any part of any Proceeding) initiated by Indemnitee
against the Company or its directors, officers, employees, agents or other indemnitees, unless (i) the Company’s board of directors authorized the Proceeding (or the relevant part of the Proceeding) prior to its initiation, (ii) the
Company provides the indemnification, in its sole discretion, pursuant to the powers vested in the Company under applicable law, (iii) otherwise authorized in Section 10(d) or (iv) otherwise required by applicable law; provided, for
the avoidance of doubt, Indemnitee shall not be deemed for purposes of this paragraph, to have initiated any Proceeding (or any part of a Proceeding) by reason of (i) having asserted any affirmative defenses in connection with a claim not
initiated by Indemnitee or (ii) having made any counterclaim (whether permissive or mandatory) in connection with any claim not initiated by Indemnitee; or 

(e)    if prohibited by the DGCL or other applicable law. 

  
 4 

 6.    Advances of Expenses. The Company shall advance the
Expenses incurred by Indemnitee in connection with any Proceeding prior to its final disposition, and such advancement shall be made as soon as reasonably practicable, but in any event no later than 30 days, after the receipt by the Company of a
written statement or statements requesting such advances from time to time (which shall include invoices received by Indemnitee in connection with such Expenses but, in the case of invoices in connection with legal services, any references to legal
work performed or to expenditure made that would cause Indemnitee to waive any privilege accorded by applicable law shall not be included with the invoice). Advances shall be unsecured and interest free and made without regard to Indemnitee’s
ability to repay such advances. Indemnitee hereby undertakes to repay any advance to the extent that it is ultimately determined that Indemnitee is not entitled to be indemnified by the Company, except, with respect to advances of expenses
made pursuant to Section 10(c), in which case Indemnitee makes the undertaking provided in Section 10(c). This Section 6 shall not apply to the extent advancement is prohibited by law and shall not apply to any Proceeding (or any part
of any Proceeding) for which indemnity is not permitted under this Agreement, but shall apply to any Proceeding (or any part of any Proceeding) referenced in Section 5(b) or 5(c) prior to a determination that Indemnitee is not entitled to be
indemnified by the Company. 
 7.    Procedures for Notification and Defense of Claim. 

(a)    Indemnitee shall notify the Company in writing of any matter with respect to which Indemnitee intends to seek
indemnification or advancement of Expenses as soon as reasonably practicable following the receipt by Indemnitee of notice thereof. The written notification to the Company shall include, in reasonable detail, a description of the nature of the
Proceeding and the facts underlying the Proceeding. The failure by Indemnitee to notify the Company will not relieve the Company from any liability that it may have to Indemnitee hereunder or otherwise than under this Agreement, and any delay in so
notifying the Company shall not constitute a waiver by Indemnitee of any rights, except to the extent that such failure or delay materially prejudices the Company. 

(b)    If, at the time of the receipt of a notice of a Proceeding pursuant to the terms hereof, the Company has
directors’ and officers’ liability insurance in effect that may be applicable to the Proceeding, the Company shall give prompt notice of the commencement of the Proceeding to the insurers in accordance with the procedures set forth in the
applicable policies. The Company shall thereafter take all commercially reasonable action to cause such insurers to pay, on behalf of Indemnitee, all amounts payable as a result of such Proceeding in accordance with the terms of such policies. 

(c)    In the event the Company may be obligated to make any indemnity in connection with a Proceeding, the Company
shall be entitled to assume the defense of such Proceeding with counsel approved by Indemnitee, which approval shall not be unreasonably withheld, conditioned or delayed, upon the delivery to Indemnitee of written notice of its election to do so.
After delivery of such notice, approval of such counsel by Indemnitee and the retention of such counsel by the Company, the Company will not be liable to Indemnitee for any fees or expenses of counsel subsequently incurred by Indemnitee with respect
to the same Proceeding. Notwithstanding the Company’s assumption of the defense of any such Proceeding, the Company shall be obligated to pay the fees and expenses of Indemnitee’s separate counsel to the extent (i) the employment of
separate counsel by Indemnitee is authorized by the Company, (ii) counsel for the Company shall have reasonably concluded that there is a conflict of interest between the Company and Indemnitee in the conduct of any such defense such that
Indemnitee needs to be separately represented, (iii) the Company is not financially or legally able to perform its indemnification obligations, or (iv) the Company shall not have retained, or shall not continue to retain, counsel to defend
such Proceeding. Regardless of any provision in this Agreement, Indemnitee shall have the right to employ counsel in any Proceeding at Indemnitee’s personal expense. The Company shall not be entitled, without the consent of Indemnitee, to
assume the defense of any claim brought by or in the right of the Company. 

  
 5 

 (d)    Indemnitee shall give the Company such information and
cooperation in connection with the Proceeding as may be reasonably appropriate. 
 (e)    The Company shall not
be liable to indemnify Indemnitee for any settlement of any Proceeding (or any part thereof) effected without the Company’s prior written consent, which shall not be unreasonably withheld, conditioned or delayed. The Company acknowledges that a
settlement or other disposition short of final judgment may be successful if it permits a party to avoid expense, delay, distraction, disruption and uncertainty. In the event that any action, claim or proceeding to which Indemnitee is a party is
resolved in a settlement to which the Company has given its prior written consent, such settlement shall be treated as a success on the merits in the settled action, suit or proceeding. 

(f)    The Company shall not settle any Proceeding (or any part thereof) in a manner that imposes any penalty or
liability on Indemnitee not paid by the Company without Indemnitee’s prior written consent, which shall not be unreasonably withheld, conditioned or delayed. 

8.    Procedures upon Application for Indemnification. 

(a)    To obtain indemnification, Indemnitee shall submit to the Company a written request, including therein or
therewith such documentation and information as is reasonably available to Indemnitee and as is reasonably necessary to determine whether and to what extent Indemnitee is entitled to indemnification following the final disposition of the Proceeding.
Any delay in providing the request will not relieve the Company from its obligations under this Agreement, except to the extent such failure is prejudicial. 

(b)    Upon written request by Indemnitee for indemnification pursuant to Section 8(a), a determination with
respect to Indemnitee’s entitlement thereto shall be made as follows, provided that a Change in Control shall not have occurred: (i) by a majority vote of the Disinterested Directors, even though less than a quorum of the Company’s
board of directors; (ii) by a committee of Disinterested Directors designated by a majority vote of the Disinterested Directors, even though less than a quorum of the Company’s board of directors; (iii) if there are no such
Disinterested Directors or, if a majority of Disinterested Directors so direct, by Independent Counsel in a written opinion to the Company’s board of directors, a copy of which shall be delivered to Indemnitee; or (iv) if so directed by
the Company’s board of directors, by the stockholders of the Company. If a Change in Control shall have occurred, a determination with respect to Indemnitee’s entitlement to indemnification shall be made by Independent Counsel in a written
opinion to the Company’s board of directors, a copy of which shall be delivered to Indemnitee. If it is determined that Indemnitee is entitled to indemnification, payment to Indemnitee shall be made within ten days after such determination.
Indemnitee shall cooperate with the person, persons or entity making the determination with respect to Indemnitee’s entitlement to indemnification, including providing to such person, persons or entity upon reasonable advance request any
documentation or information that is not privileged or otherwise protected from disclosure and that is reasonably available to Indemnitee and reasonably necessary to such determination. Any costs or expenses (including attorneys’ fees and
disbursements) actually and reasonably incurred by Indemnitee in so cooperating with the person, persons or entity making such determination shall be borne by the Company, to the extent permitted by applicable law. 

(c)    In the event the determination of entitlement to indemnification is to be made by Independent Counsel
pursuant to Section 8(b), the Independent Counsel shall be selected as provided in this Section 8(c). If a Change in Control shall not have occurred, the Independent Counsel shall be selected by the Company’s board of directors, and
the Company shall give written notice to Indemnitee advising him or her of the identity of the Independent Counsel so selected. If a Change in Control shall have occurred, the Independent Counsel shall be selected by Indemnitee (unless Indemnitee
shall request that 

  
 6 

 
such selection be made by the Company’s board of directors, in which event the preceding sentence shall apply), and Indemnitee shall give written notice to the Company advising it of the
identity of the Independent Counsel so selected. In either event, Indemnitee or the Company, as the case may be, may, within ten days after such written notice of selection shall have been given, deliver to the Company or to Indemnitee, as the case
may be, a written objection to such selection; provided, however, that such objection may be asserted only on the ground that the Independent Counsel so selected does not meet the requirements of “Independent Counsel” as defined in
Section 1, and the objection shall set forth with particularity the factual basis of such assertion. Absent a proper and timely objection, the person so selected shall act as Independent Counsel. If such written objection is so made and
substantiated, the Independent Counsel so selected may not serve as Independent Counsel unless and until such objection is withdrawn or a court has determined that such objection is without merit. If, within 20 days after the later of
(i) submission by Indemnitee of a written request for indemnification pursuant to Section 8(a) and (ii) the final disposition of the Proceeding, the parties have not agreed upon an Independent Counsel, either the Company or Indemnitee
may petition a court of competent jurisdiction for resolution of any objection that shall have been made by the Company or Indemnitee to the other’s selection of Independent Counsel and for the appointment as Independent Counsel of a person
selected by the court or by such other person as the court shall designate, and the person with respect to whom all objections are so resolved or the person so appointed shall act as Independent Counsel under Section 8(b). Upon the due
commencement of any judicial proceeding or arbitration pursuant to Section 10(a), the Independent Counsel shall be discharged and relieved of any further responsibility in such capacity (subject to the applicable standards of professional
conduct then prevailing). 
 (d)    The Company shall pay the reasonable fees and expenses of any Independent
Counsel and to fully indemnify such counsel against any and all Expenses, claims, liabilities and damages arising out of or relating to this Agreement or its engagement pursuant hereto. 

9.    Presumptions and Effect of Certain Proceedings. 

(a)    In making a determination with respect to entitlement to indemnification hereunder, the person, persons or
entity making such determination shall, to the fullest extent not prohibited by law, presume that Indemnitee is entitled to indemnification under this Agreement, and the Company shall, to the fullest extent not prohibited by law, have the burden of
proof to overcome that presumption by clear and convincing evidence. 
 (b)    The termination of any Proceeding
or of any claim, issue or matter therein, by judgment, order, settlement or conviction, or upon a plea of nolo contendere or its equivalent, shall not (except as otherwise expressly provided in this Agreement) of itself adversely
affect the right of Indemnitee to indemnification or create a presumption that Indemnitee did not act in good faith and in a manner that he or she reasonably believed to be in or not opposed to the best interests of the Company or, with respect to
any criminal Proceeding, that Indemnitee had reasonable cause to believe that his or her conduct was unlawful. 

(c)    For purposes of any determination of good faith, Indemnitee shall be deemed to have acted in good faith to
the extent Indemnitee relied in good faith on (i) the records or books of account of the Enterprise, including financial statements, (ii) information supplied to Indemnitee by the officers of the Enterprise in the course of their duties,
(iii) the advice of legal counsel for the Enterprise or its board of directors or counsel selected by any committee of the board of directors or (iv) information or records given or reports made to the Enterprise by an independent
certified public accountant, an appraiser, investment banker or other expert selected with reasonable care by the Enterprise or its board of directors or any committee of the board of directors. The provisions of this Section 11(c) shall not be
deemed to be exclusive or to limit in any way the other circumstances in which Indemnitee may be deemed to have met the applicable standard of conduct set forth in this Agreement. 

  
 7 

 (d)    Neither the knowledge, actions nor failure to act of any
other director, officer, agent or employee of the Enterprise shall be imputed to Indemnitee for purposes of determining the right to indemnification under this Agreement. 

10.    Remedies of Indemnitee. 

(a)    Subject to Section 10(e), in the event that (i) a determination is made pursuant to Section 9
that Indemnitee is not entitled to indemnification under this Agreement, (ii) advancement of Expenses is not timely made pursuant to Section 6 or 10(d), (iii) no determination of entitlement to indemnification shall have been made pursuant
to Section 8 within 30 days after the later of the receipt by the Company of the request for indemnification or the final disposition of the Proceeding, (iv) payment of indemnification pursuant to this Agreement is not made (A) within
ten days after a determination has been made that Indemnitee is entitled to indemnification or (B) with respect to indemnification pursuant to Sections 4, 5 and 10(d), within 30 days after receipt by the Company of a written request therefor,
or (v) the Company or any other person or entity takes or threatens to take any action to declare this Agreement void or unenforceable, or institutes any litigation or other action or proceeding designed to deny, or to recover from, Indemnitee
the benefits provided or intended to be provided to Indemnitee hereunder, Indemnitee shall be entitled to an adjudication by a court of competent jurisdiction of his or her entitlement to such indemnification or advancement of Expenses.
Alternatively, Indemnitee, at his or her option, may seek an award in arbitration with respect to his or her entitlement to such indemnification or advancement of Expenses, to be conducted by a single arbitrator pursuant to the Commercial
Arbitration Rules of the American Arbitration Association. Indemnitee shall commence such proceeding seeking an adjudication or an award in arbitration within 12 months following the date on which Indemnitee first has the right to commence such
proceeding pursuant to this Section 10(a); provided, however, that the foregoing clause shall not apply in respect of a proceeding brought by Indemnitee to enforce his or her rights under Section 4. The Company shall not oppose
Indemnitee’s right to seek any such adjudication or award in arbitration in accordance with this Agreement. 

(b)    Neither (i) the failure of the Company, its board of directors, any committee or subgroup of the board
of directors, Independent Counsel or stockholders to have made a determination that indemnification of Indemnitee is proper in the circumstances because Indemnitee has met the applicable standard of conduct, nor (ii) an actual determination by
the Company, its board of directors, any committee or subgroup of the board of directors, Independent Counsel or stockholders that Indemnitee has not met the applicable standard of conduct, shall create a presumption that Indemnitee has or has not
met the applicable standard of conduct. In the event that a determination shall have been made pursuant to Section 8 that Indemnitee is not entitled to indemnification, any judicial proceeding or arbitration commenced pursuant to this
Section 10 shall be conducted in all respects as a de novo trial, or arbitration, on the merits, and Indemnitee shall not be prejudiced by reason of that adverse determination. In any judicial proceeding or arbitration commenced pursuant
to this Section 10, the Company shall, to the fullest extent not prohibited by law, have the burden of proving Indemnitee is not entitled to indemnification or advancement of Expenses, as the case may be, and the burden of proof shall be by
clear and convincing evidence. 
 (c)    To the fullest extent not prohibited by law, the Company shall be
precluded from asserting in any judicial proceeding or arbitration commenced pursuant to this Section 10 that the procedures and presumptions of this Agreement are not valid, binding and enforceable and shall stipulate in any such court or
before any such arbitrator that the Company is bound by all the provisions of this Agreement. If a determination shall have been made pursuant to Section 10 that Indemnitee is entitled to indemnification, the Company shall be bound by such
determination in any judicial proceeding or 

  
 8 

 
arbitration commenced pursuant to this Section 10, absent (i) a misstatement by Indemnitee of a material fact, or an omission of a material fact necessary to make Indemnitee’s
statements not materially misleading, in connection with the request for indemnification, or (ii) a prohibition of such indemnification under applicable law. 

(d)    To the extent not prohibited by law, the Company shall indemnify Indemnitee against all Expenses incurred by
Indemnitee in connection with any action for indemnification or advancement of Expenses from the Company under this Agreement, any other agreement, the Company’s certificate of incorporation or bylaws or under any directors’ and
officers’ liability insurance policies maintained by the Company to the extent Indemnitee is successful in such action, and, if requested by Indemnitee, shall (as soon as reasonably practicable, but in any event no later than 30 days, after
receipt by the Company of a written request therefor) advance such Expenses to Indemnitee, subject to the provisions of Section 6. Indemnitee hereby undertakes to repay such advances to the extent the Indemnitee is ultimately unsuccessful in
such action or arbitration. 
 (e)    Notwithstanding anything in this Agreement to the contrary, no
determination as to entitlement to indemnification shall be required to be made prior to the final disposition of the Proceeding. 

11.    Contribution. To the fullest extent permissible under applicable law, if the indemnification provided
for in this Agreement is unavailable to Indemnitee, the Company, in lieu of indemnifying Indemnitee, shall contribute to the amounts incurred by Indemnitee, whether for Expenses, judgments, fines or amounts paid or to be paid in settlement, in
connection with any claim relating to an indemnifiable event under this Agreement, in such proportion as is deemed fair and reasonable in light of all of the circumstances of such Proceeding in order to reflect (i) the relative benefits
received by the Company and Indemnitee as a result of the events and transactions giving rise to such Proceeding; and (ii) the relative fault of Indemnitee and the Company (and its other directors, officers, employees and agents) in connection
with such events and transactions. 
 12.    Non-exclusivity. The
rights of indemnification and to receive advancement of Expenses as provided by this Agreement shall not be deemed exclusive of any other rights to which Indemnitee may at any time be entitled under applicable law, the Company’s certificate of
incorporation or bylaws, any agreement, a vote of stockholders or a resolution of directors, or otherwise. To the extent that a change in Delaware law, whether by statute or judicial decision, permits greater indemnification or advancement of
Expenses than would be afforded currently under the Company’s certificate of incorporation and bylaws and this Agreement, it is the intent of the parties hereto that Indemnitee shall enjoy by this Agreement the greater benefits so afforded by
such change, subject to the restrictions expressly set forth herein or therein. Except as expressly set forth herein, no right or remedy herein conferred is intended to be exclusive of any other right or remedy, and every other right and remedy
shall be cumulative and in addition to every other right and remedy given hereunder or now or hereafter existing at law or in equity or otherwise. Except as expressly set forth herein, the assertion or employment of any right or remedy hereunder, or
otherwise, shall not prevent the concurrent assertion or employment of any other right or remedy. 

13.    Primary Responsibility. The Company acknowledges that to the extent Indemnitee is serving as a
director on the Company’s board of directors at the request or direction of a private equity or venture capital fund or other entity and/or certain of its affiliates (collectively, the “Secondary Indemnitors”),
Indemnitee may have certain rights to indemnification and advancement of expenses provided by such Secondary Indemnitors. The Company agrees that, as between the Company and the Secondary Indemnitors, the Company is primarily responsible for amounts
required to be indemnified or advanced under the Company’s certificate of incorporation or bylaws or this Agreement and any obligation of the Secondary Indemnitors to provide indemnification or advancement for the same amounts is

  
 9 

 
secondary to those Company obligations. To the extent not in contravention of any insurance policy or policies providing liability or other insurance for the Company or any director, trustee,
general partner, managing member, officer, employee, agent or fiduciary of the Company or any other Enterprise, the Company waives any right of contribution or subrogation against the Secondary Indemnitors with respect to the liabilities for which
the Company is primarily responsible under this Section 13. In the event of any payment by the Secondary Indemnitors of amounts otherwise required to be indemnified or advanced by the Company under the Company’s certificate of
incorporation or bylaws or this Agreement, the Secondary Indemnitors shall be subrogated to the extent of such payment to all of the rights of recovery of Indemnitee for indemnification or advancement of expenses under the Company’s certificate
of incorporation or bylaws or this Agreement or, to the extent such subrogation is unavailable and contribution is found to be the applicable remedy, shall have a right of contribution with respect to the amounts paid. The Secondary Indemnitors are
express third-party beneficiaries of the terms of this Section 13. 
 14.    No Duplication of
Payments. Subject to Section 13, the Company shall not be liable under this Agreement to make any payment of amounts otherwise indemnifiable hereunder (or for which advancement is provided hereunder) if and to the extent that Indemnitee has
otherwise actually received payment for such amounts under any insurance policy, contract, agreement or otherwise. 

15.    Insurance. To the extent that the Company maintains an insurance policy or policies providing
liability insurance for directors, trustees, general partners, managing members, officers, employees, agents or fiduciaries of the Company or any other Enterprise, Indemnitee shall be covered by such policy or policies to the same extent as the most
favorably-insured persons under such policy or policies in a comparable position. 
 16.    Subrogation.
Subject to Section 13, in the event of any payment under this Agreement, the Company shall be subrogated to the extent of such payment to all of the rights of recovery of Indemnitee, who shall execute all papers required and take all action
necessary to secure such rights, including execution of such documents as are necessary to enable the Company to bring suit to enforce such rights. 

17.    Services to the Company. Indemnitee agrees to serve as a director or officer of the Company or, at
the request of the Company, as a director, trustee, general partner, managing member, officer, employee, agent or fiduciary of another Enterprise, for so long as Indemnitee is duly elected or appointed or until Indemnitee tenders his or her
resignation or is removed from such position. Indemnitee may at any time and for any reason resign from such position (subject to any other contractual obligation or any obligation imposed by operation of law), in which event the Company shall have
no obligation under this Agreement to continue Indemnitee in such position. This Agreement shall not be deemed an employment contract between the Company (or any of its subsidiaries or any Enterprise) and Indemnitee. Indemnitee specifically
acknowledges that any employment with the Company (or any of its subsidiaries or any Enterprise) is at will, and Indemnitee may be discharged at any time for any reason, with or without cause, with or without notice, except as may be otherwise
expressly provided in any executed, written employment contract between Indemnitee and the Company (or any of its subsidiaries or any Enterprise), any existing formal severance policies adopted by the Company’s board of directors or, with
respect to service as a director or officer of the Company, the Company’s certificate of incorporation or bylaws or the DGCL. No such document shall be subject to any oral modification thereof. 

18.    Duration. This Agreement shall continue until and terminate upon the later of (a) ten years
after the date that Indemnitee shall have ceased to serve as a director or officer of the Company or as a director, trustee, general partner, managing member, officer, employee, agent or fiduciary of any other Enterprise, as applicable; or
(b) one year after the final termination of any Proceeding, including any appeal, then pending in respect of which Indemnitee is granted rights of indemnification or advancement of Expenses hereunder and of any Proceeding commenced by
Indemnitee pursuant to Section 10 relating thereto. 

  
 10 

 19.    Successors. This Agreement shall be binding upon
the Company and its successors and assigns, including any direct or indirect successor, by purchase, merger, consolidation or otherwise, to all or substantially all of the business or assets of the Company, and shall inure to the benefit of
Indemnitee and Indemnitee’s heirs, executors and administrators. Further, the Company shall require and cause any successor (whether direct or indirect by purchase, merger, consolidation or otherwise) to all or substantially all of the business
or assets of the Company, by written agreement, expressly to assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform if no such succession had taken place. 

20.    Severability. Nothing in this Agreement is intended to require or shall be construed as requiring the
Company to do or fail to do any act in violation of applicable law. The Company’s inability, pursuant to court order or other applicable law, to perform its obligations under this Agreement shall not constitute a breach of this Agreement. If
any provision or provisions of this Agreement shall be held to be invalid, illegal or unenforceable for any reason whatsoever: (i) the validity, legality and enforceability of the remaining provisions of this Agreement (including without
limitation, each portion of any section of this Agreement containing any such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby and
shall remain enforceable to the fullest extent permitted by law; (ii) such provision or provisions shall be deemed reformed to the extent necessary to conform to applicable law and to give the maximum effect to the intent of the parties hereto;
and (iii) to the fullest extent possible, the provisions of this Agreement (including, without limitation, each portion of any section of this Agreement containing any such provision held to be invalid, illegal or unenforceable, that is not
itself invalid, illegal or unenforceable) shall be construed so as to give effect to the intent manifested thereby. 

21.    Enforcement. The Company expressly confirms and agrees that it has entered into this Agreement and
assumed the obligations imposed on it hereby in order to induce Indemnitee to serve as a director or officer of the Company, and the Company acknowledges that Indemnitee is relying upon this Agreement in serving as a director or officer of the
Company. 
 22.    Entire Agreement. This Agreement constitutes the entire agreement between the parties
hereto with respect to the subject matter hereof and supersedes all prior agreements and understandings, oral, written and implied, between the parties hereto with respect to the subject matter hereof; provided, however, that this
Agreement is a supplement to and in furtherance of the Company’s certificate of incorporation and bylaws and applicable law. 

23.    Modification and Waiver. No supplement, modification or amendment to this Agreement shall be binding
unless executed in writing by the parties hereto. No amendment, alteration or repeal of this Agreement shall adversely affect any right of Indemnitee under this Agreement in respect of any action taken or omitted by such Indemnitee in his or her
Corporate Status prior to such amendment, alteration or repeal. No waiver of any of the provisions of this Agreement shall constitute or be deemed a waiver of any other provision of this Agreement nor shall any waiver constitute a continuing waiver.

 24.    Notices. All notices and other communications required or permitted hereunder shall be in
writing and shall be mailed by registered or certified mail, postage prepaid, sent by facsimile or electronic mail or otherwise delivered by hand, messenger or courier service addressed: 

(a)    if to Indemnitee, to Indemnitee’s address, facsimile number or electronic mail address as shown on the
signature page of this Agreement or in the Company’s records, as may be updated in accordance with the provisions hereof; or 

  
 11 

 (b)    if to the Company, to 620 8th Ave, 45th Floor, New York, NY 10018, Attention: General Counsel or at such other current address as the Company shall have furnished to
Indemnitee. 
 Each such notice or other communication shall for all purposes of this Agreement be treated as effective or having been given
(i) if delivered by hand, messenger or courier service, when delivered (or if sent via a nationally-recognized overnight courier service, freight prepaid, specifying next-business-day delivery, one
business day after deposit with the courier), or (ii) if sent via mail, at the earlier of its receipt or five days after the same has been deposited in a regularly-maintained receptacle for the deposit of the United States mail, addressed and
mailed as aforesaid, or (iii) if sent via facsimile, upon confirmation of facsimile transfer or, if sent via electronic mail, upon confirmation of delivery when directed to the relevant electronic mail address, if sent during normal business
hours of the recipient, or if not sent during normal business hours of the recipient, then on the recipient’s next business day. 

25.    Applicable Law and Consent to Jurisdiction. This Agreement shall be governed by, and construed and
enforced in accordance with, the laws of the State of Delaware, without regard to its conflict of laws rules. Except with respect to any arbitration commenced by Indemnitee pursuant to Section 10(a), the Company and Indemnitee hereby
irrevocably and unconditionally (i) agree that any action or proceeding arising out of or in connection with this Agreement shall be brought only in the Delaware Court of Chancery, and not in any other state or federal court in the United
States of America or any court in any other country, (ii) consent to submit to the exclusive jurisdiction of the Delaware Court of Chancery for purposes of any action or proceeding arising out of or in connection with this Agreement,
(iii) appoint, to the extent such party is not otherwise subject to service of process in the State of Delaware, The Corporation Trust Company, Wilmington, Delaware as its agent in the State of Delaware as such party’s agent for acceptance
of legal process in connection with any such action or proceeding against such party with the same legal force and validity as if served upon such party personally within the State of Delaware, (iv) waive any objection to the laying of venue of
any such action or proceeding in the Delaware Court of Chancery, and (v) waive, and agree not to plead or to make, any claim that any such action or proceeding brought in the Delaware Court of Chancery has been brought in an improper or
inconvenient forum. 
 26.    Counterparts. This Agreement may be executed in one or more counterparts,
each of which shall for all purposes be deemed to be an original but all of which together shall constitute one and the same Agreement. This Agreement may also be executed and delivered by facsimile signature and in counterparts, each of which shall
for all purposes be deemed to be an original but all of which together shall constitute one and the same Agreement. Only one such counterpart signed by the party against whom enforceability is sought needs to be produced to evidence the existence of
this Agreement. 
 27.    Captions. The headings of the paragraphs of this Agreement are inserted for
convenience only and shall not be deemed to constitute part of this Agreement or to affect the construction thereof. 
 (signature page
follows) 

  
 12 

 The parties are signing this Indemnification Agreement as of the date stated in the
introductory sentence. 
  

			
	DATADOG, INC.

 
			
		
	By:	 	  

		
	Name:	 	
		
	Title:	 	

 
			
	
	  

	[INDEMNITEE NAME]

 
			
		
	Address:	 	  

		
		 	  

  
 13

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