David M. Obstler - 21 Sep 2026 Form 4 Insider Report for Datadog, Inc. (DDOG)

Reporting relationship: Chief Financial Officer
Issuer ticker: DDOG
Reported as of: 21 Sep 2026
Net transaction value: -$3,860,000
SEC form: 4
Accepted by SEC: 23 Sep 2026, 16:50:04 UTC
Prior SEC filing: 16 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Kerry Acocella, Attorney-in-Fact

Key filing fact

David M. Obstler filed Form 4 for Datadog, Inc. (DDOG) on 23 Sep 2026.

Key facts

This page summarizes David M. Obstler's Form 4 filing for Datadog, Inc. (DDOG).
7 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 23 Sep 2026, 16:50.

Change

Previous filing in this sequence was filed on 16 Sep 2026.
Current net transaction value: -$3,860,000.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001120741 Primary reporting owner

OBSTLER DAVID M

Relationship: Chief Financial Officer
Address: C/O DATADOG, INC., 620 8TH AVENUE, 45TH FLOOR, NEW YORK
Signature: /s/ Kerry Acocella, Attorney-in-Fact
Signature date: 23 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DDOG transaction

Class A Common Stock

Sale

Transaction value: $2,412,500
Shares: -10,000
Change %: -2.6%
Price: $241.25
Shares after: 368,067
Date: 21 Sep 2026
Ownership: Direct
Footnotes: F1

DDOG transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,000
Change %
Price: $0.000000^*
Shares after: 3,000
Date: 21 Sep 2026
Ownership: By Trust
Footnotes: F2, F3

DDOG transaction

Class A Common Stock

Sale

Transaction value: $723,750
Shares: -3,000
Change %: -100%
Price: $241.25
Shares after: 0
Date: 21 Sep 2026
Ownership: By Trust
Footnotes: F1, F3

DDOG transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,000
Change %
Price: $0.000000^*
Shares after: 3,000
Date: 21 Sep 2026
Ownership: By Trust
Footnotes: F2, F4

DDOG transaction

Class A Common Stock

Sale

Transaction value: $723,750
Shares: -3,000
Change %: -100%
Price: $241.25
Shares after: 0
Date: 21 Sep 2026
Ownership: By Trust
Footnotes: F1, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

DDOG transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares: -3,000
Change %: -8.8%
Price: $0.000000^*
Shares after: 31,198
Date: 21 Sep 2026
Ownership: By Trust
Underlying class: Class A Common Stock
Underlying amount: 3,000
Exercise price
Footnotes: F2, F3

DDOG transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares: -3,000
Change %: -8.8%
Price: $0.000000^*
Shares after: 31,199
Date: 21 Sep 2026
Ownership: By Trust
Underlying class: Class A Common Stock
Underlying amount: 3,000
Exercise price
Footnotes: F2, F4

DDOG holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 8,103
Date: 21 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 8,103
Exercise price
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 4 footnotes

Footnote F1

Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.

Footnote F2

Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock.

Footnote F3

Shares are held directly by Obstler Children 2019 Trust FBO the Reporting Person's other child, of which the Reporting Person's spouse is Trustee. See Footnote 4.

Footnote F4

Shares are held directly by Obstler Children 2019 Trust FBO the Reporting Person's child, of which the Reporting Person's spouse is Trustee. Obstler Children 2019 Trust FBO the Reporting Person's child and Obstler Children 2019 Trust FBO the Reporting Person's other child are separate trusts for the benefit of the Reporting Person's children with substantially identical terms.