OBSTLER DAVID M (Chief Financial Officer) sold 16K shares of DATADOG, INC. on the open market

Open‑market sale worth $3.86M. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

OBSTLER DAVID M

Filed: 9/23/2026ACC: 0001561550-26-000318

InsiderOBSTLER DAVID MCIK 1120741

→

IssuerDATADOG, INC.CIK 1561550

Officer· Chief Financial Officer

Since Sep 2019

-16K

Net shares

Net seller

$3.86M

Total sold

Open market trades

0B · 3S

Total transactions

6K acquired · 22K disposed

Non-Derivative Transactions5

Class A Common Stock

Direct

S · Sale

−10K

Price / share

$241.25

Trade value

$2.41M

% of position

2.6%

9/21/2026

378.07K→368.07K

Class A Common Stock

Indirect

C · Conversion

+3K

Price / share

—

Trade value

—

% of position

New position

9/21/2026

0.00→3K

Class A Common Stock

Indirect

S · Sale

−3K

Price / share

$241.25

Trade value

$723.75K

% of position

New position

9/21/2026

3K→0.00

Class A Common Stock

Indirect

C · Conversion

+3K

Price / share

—

Trade value

—

% of position

New position

9/21/2026

0.00→3K

Class A Common Stock

Indirect

S · Sale

−3K

Price / share

$241.25

Trade value

$723.75K

% of position

New position

9/21/2026

3K→0.00

Total

Net shares

−10K

Net value

-$3.86M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	9/21/2026	S · Sale	−10K	$241.25	$2.41M	2.6%	378.07K	368.07K
Class A Common Stock Indirect	9/21/2026	C · Conversion	+3K	—	—	New position	0.00	3K
Class A Common Stock Indirect	9/21/2026	S · Sale	−3K	$241.25	$723.75K	New position	3K	0.00
Class A Common Stock Indirect	9/21/2026	C · Conversion	+3K	—	—	New position	0.00	3K
Class A Common Stock Indirect	9/21/2026	S · Sale	−3K	$241.25	$723.75K	New position	3K	0.00
Total			−10K		-$3.86M

Derivative Transactions2

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

3K shares

−3K

Strike price

Held after

31.20K

Exercisable

—

9/21/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

3K shares

−3K

Strike price

Held after

31.20K

Exercisable

—

9/21/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Class B Common Stock Indirect	Class A Common Stock3K shares	9/21/2026	C · Conversion	−3K		—	31.20K
Class B Common Stock Indirect	Class A Common Stock3K shares	9/21/2026	C · Conversion	−3K		—	31.20K

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)1

Class B Common Stock

Direct

Underlying security

Class A Common Stock

Underlying shares

8.10K

Shares owned

8.10K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

8.10K

Owned

8.10K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Class B Common Stock Direct	Class A Common Stock		—	—	8.10K	8.10K
Total					8.10K	8.10K