STOCK TITAN

Datadog, Inc. (DDOG) family trust converts and sells 12,500 shares

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Datadog, Inc. director Michael James Callahan reported that The Callahan-Thernstrom Family Trust converted 12,500 shares of Class B Common Stock into 12,500 Class A shares on August 4, 2026, then sold those 12,500 Class A shares at $287.4700 per share under a Rule 10b5-1 plan dated March 13, 2026. Following these transactions, the trust holds 85,542 Class B shares, and Callahan directly holds 20,684 Class A shares.

Positive

  • None.

Negative

  • None.
Insider Callahan Michael James
Role Director
Sold 12,500 shs ($3.59M)
Approx. gross sale proceeds $3.59M
Type Security Shares Price Value
Conversion Class B Common Stock F1, F2 12,500 $0.00 $0.00
Conversion Class A Common Stock F1, F2 12,500 $0.00 $0.00
Sale Class A Common Stock F3, F2 12,500 $287.47 $3.59M
holding Class A Common Stock -- -- --
Holdings After Transaction: Class B Common Stock — 85,542 shares (Indirect, By Trust); Class A Common Stock — 14,996 shares (Indirect, By Trust); Class A Common Stock — 20,684 shares (Direct)
Footnotes (3)
  1. F1. 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.
  2. F2. The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee.
  3. F3. Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.
Shares converted 12500.0000 shares Class B Common Stock converted into Class A Common Stock on August 4, 2026
Shares sold 12500.0000 shares Class A Common Stock sold by The Callahan-Thernstrom Family Trust on August 4, 2026
Sale price $287.4700 per share Price for the 12,500 Class A shares sold on August 4, 2026
Trust Class B holdings 85542.0000 shares Class B Common Stock held by The Callahan-Thernstrom Family Trust after transactions
Direct Class A holdings 20684.0000 shares Class A Common Stock held directly by Michael James Callahan after transactions
Net shares sold 12500 shares Net buy/sell shares across reported transactions (net-sell direction)
Rule 10b5-1 plan regulatory
"Shares sold pursuant to a 10b5-1 plan dated March 13, 2026."
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
Class B Common Stock financial
"Each share of Class B Common Stock is convertible at any time at the option"
A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.
Permitted Transfers regulatory
"except for certain "Permitted Transfers" as defined in the Issuer's amended"
amended and restated certificate of incorporation regulatory
"as defined in the Issuer's amended and restated certificate of incorporation"
A company’s amended and restated certificate of incorporation is an updated version of its foundational legal charter that replaces the older document and folds in all changes into one clear copy; it spells out corporate structure, classes of stock, shareholder rights and key governance rules. Investors care because it can change who controls the company, how votes are counted, what claims shareholders have on assets or dividends, and can introduce or remove protections against takeovers—like updating a house title after a major renovation to show who owns what and under what rules.

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google
Add on Google
Learn about SEC filing dates

FAQ

What insider transactions did Datadog (DDOG) director Michael James Callahan report?

Michael James Callahan reported that his family trust converted 12,500 Class B shares into 12,500 Class A shares, then sold those 12,500 Class A shares at $287.4700 per share on August 4, 2026, under a Rule 10b5-1 trading plan.

How many Datadog (DDOG) shares were sold and at what price?

The Callahan-Thernstrom Family Trust sold 12,500 Datadog Class A Common shares at $287.4700 per share. These shares came from a same-day conversion of Class B Common Stock into Class A Common Stock on August 4, 2026.

Were the Datadog (DDOG) share sales made under a Rule 10b5-1 plan?

Yes. The 12,500 Datadog Class A shares were sold pursuant to a Rule 10b5-1 plan dated March 13, 2026. The filing’s Rule 10b5-1 checkbox is marked as affirmed, indicating the transactions occurred under a pre-arranged trading plan.

What Datadog (DDOG) shareholdings remain after Callahan’s reported transactions?

After the reported transactions, The Callahan-Thernstrom Family Trust holds 85,542 shares of Datadog Class B Common Stock, and Michael James Callahan directly holds 20,684 shares of Datadog Class A Common Stock, according to the Form 4 holdings information.

What is the difference between Datadog (DDOG) Class A and Class B shares in this filing?

Each share of Datadog Class B Common Stock is convertible into one Class A share at any time and has no expiration. Class B shares also automatically convert to Class A upon certain transfers, the holder’s death, or the tenth anniversary of Datadog’s IPO.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Callahan Michael James

(Last)(First)(Middle)
C/O DATADOG, INC.
620 8TH AVENUE, 45TH FLOOR

(Street)
NEW YORK NEW YORK 10018

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Datadog, Inc. [ DDOG ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/04/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Class A Common Stock08/04/2026C(1)12,500A$027,496IBy Trust(2)
Class A Common Stock08/04/2026S(3)12,500D$287.4714,996IBy Trust(2)
Class A Common Stock20,684D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Class B Common Stock(1)08/04/2026C12,500 (1) (1)Class A Common Stock12,500$085,542IBy Trust(2)
Explanation of Responses:
1. 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.
2. The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee.
3. Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.
Remarks:
/s/ Kerry Acocella, Attorney-in-Fact08/06/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)