OBSTLER DAVID M (Chief Financial Officer) sold 24K shares of DATADOG, INC. on the open market

Open‑market sale worth $5.46M. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 26 sales

OBSTLER DAVID M

Filed: 9/16/2026ACC: 0001561550-26-000315

InsiderOBSTLER DAVID MCIK 1120741

→

IssuerDATADOG, INC.CIK 1561550

Officer· Chief Financial Officer

Since Sep 2019

-24K

Net shares

Net seller

$5.46M

Total sold

Open market trades

0B · 26S

Total transactions

24K acquired · 48K disposed

Non-Derivative Transactions28

Class A Common Stock

Indirect

C · Conversion

+12K

Price / share

—

Trade value

—

% of position

New position

9/14/2026

0.00→12K

Class A Common Stock

Indirect

S · Sale

−798.00

Price / share

$221.24

Trade value

$176.55K

% of position

6.7%

9/14/2026

12K→11.20K

Class A Common Stock

Indirect

S · Sale

−1.62K

Price / share

$222.17

Trade value

$360.80K

% of position

14.5%

9/14/2026

11.20K→9.58K

Class A Common Stock

Indirect

S · Sale

−738.00

Price / share

$223.12

Trade value

$164.66K

% of position

7.7%

9/14/2026

9.58K→8.84K

Class A Common Stock

Indirect

S · Sale

−545.00

Price / share

$224.34

Trade value

$122.27K

% of position

6.2%

9/14/2026

8.84K→8.29K

Class A Common Stock

Indirect

S · Sale

−1.18K

Price / share

$225.13

Trade value

$266.11K

% of position

14.2%

9/14/2026

8.29K→7.11K

Class A Common Stock

Indirect

S · Sale

−190.00

Price / share

$226.19

Trade value

$42.98K

% of position

2.7%

9/14/2026

7.11K→6.92K

Class A Common Stock

Indirect

S · Sale

−169.00

Price / share

$227.72

Trade value

$38.48K

% of position

2.4%

9/14/2026

6.92K→6.75K

Class A Common Stock

Indirect

S · Sale

−360.00

Price / share

$228.59

Trade value

$82.29K

% of position

5.3%

9/14/2026

6.75K→6.39K

Class A Common Stock

Indirect

S · Sale

−2.87K

Price / share

$229.92

Trade value

$660.56K

% of position

44.9%

9/14/2026

6.39K→3.52K

Class A Common Stock

Indirect

S · Sale

−1.69K

Price / share

$230.51

Trade value

$389.33K

% of position

48.0%

9/14/2026

3.52K→1.83K

Class A Common Stock

Indirect

S · Sale

−724.00

Price / share

$231.53

Trade value

$167.63K

% of position

39.5%

9/14/2026

1.83K→1.11K

Class A Common Stock

Indirect

S · Sale

−918.00

Price / share

$232.71

Trade value

$213.63K

% of position

82.9%

9/14/2026

1.11K→190.00

Class A Common Stock

Indirect

S · Sale

−190.00

Price / share

$233.30

Trade value

$44.33K

% of position

New position

9/14/2026

190.00→0.00

Class A Common Stock

Indirect

C · Conversion

+12K

Price / share

—

Trade value

—

% of position

New position

9/14/2026

0.00→12K

Class A Common Stock

Indirect

S · Sale

−786.00

Price / share

$221.24

Trade value

$173.89K

% of position

6.6%

9/14/2026

12K→11.21K

Class A Common Stock

Indirect

S · Sale

−1.64K

Price / share

$222.16

Trade value

$363.24K

% of position

14.6%

9/14/2026

11.21K→9.58K

Class A Common Stock

Indirect

S · Sale

−725.00

Price / share

$223.12

Trade value

$161.76K

% of position

7.6%

9/14/2026

9.58K→8.85K

Class A Common Stock

Indirect

S · Sale

−525.00

Price / share

$224.34

Trade value

$117.78K

% of position

5.9%

9/14/2026

8.85K→8.33K

Class A Common Stock

Indirect

S · Sale

−1.17K

Price / share

$225.13

Trade value

$263.18K

% of position

14.0%

9/14/2026

8.33K→7.16K

Class A Common Stock

Indirect

S · Sale

−181.00

Price / share

$226.19

Trade value

$40.94K

% of position

2.5%

9/14/2026

7.16K→6.98K

Class A Common Stock

Indirect

S · Sale

−163.00

Price / share

$227.72

Trade value

$37.12K

% of position

2.3%

9/14/2026

6.98K→6.82K

Class A Common Stock

Indirect

S · Sale

−358.00

Price / share

$228.60

Trade value

$81.84K

% of position

5.3%

9/14/2026

6.82K→6.46K

Class A Common Stock

Indirect

S · Sale

−2.94K

Price / share

$229.92

Trade value

$674.81K

% of position

45.4%

9/14/2026

6.46K→3.52K

Class A Common Stock

Indirect

S · Sale

−1.73K

Price / share

$230.51

Trade value

$398.55K

% of position

49.1%

9/14/2026

3.52K→1.79K

Class A Common Stock

Indirect

S · Sale

−713.00

Price / share

$231.53

Trade value

$165.08K

% of position

39.7%

9/14/2026

1.79K→1.08K

Class A Common Stock

Indirect

S · Sale

−899.00

Price / share

$232.71

Trade value

$209.20K

% of position

83.2%

9/14/2026

1.08K→182.00

Class A Common Stock

Indirect

S · Sale

−182.00

Price / share

$233.30

Trade value

$42.46K

% of position

New position

9/14/2026

182.00→0.00

Total

Net shares

+0.00

Net value

-$5.46M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Indirect	9/14/2026	C · Conversion	+12K	—	—	New position	0.00	12K
Class A Common Stock Indirect	9/14/2026	S · Sale	−798.00	$221.24	$176.55K	6.7%	12K	11.20K
Class A Common Stock Indirect	9/14/2026	S · Sale	−1.62K	$222.17	$360.80K	14.5%	11.20K	9.58K
Class A Common Stock Indirect	9/14/2026	S · Sale	−738.00	$223.12	$164.66K	7.7%	9.58K	8.84K
Class A Common Stock Indirect	9/14/2026	S · Sale	−545.00	$224.34	$122.27K	6.2%	8.84K	8.29K
Class A Common Stock Indirect	9/14/2026	S · Sale	−1.18K	$225.13	$266.11K	14.2%	8.29K	7.11K
Class A Common Stock Indirect	9/14/2026	S · Sale	−190.00	$226.19	$42.98K	2.7%	7.11K	6.92K
Class A Common Stock Indirect	9/14/2026	S · Sale	−169.00	$227.72	$38.48K	2.4%	6.92K	6.75K
Class A Common Stock Indirect	9/14/2026	S · Sale	−360.00	$228.59	$82.29K	5.3%	6.75K	6.39K
Class A Common Stock Indirect	9/14/2026	S · Sale	−2.87K	$229.92	$660.56K	44.9%	6.39K	3.52K
Class A Common Stock Indirect	9/14/2026	S · Sale	−1.69K	$230.51	$389.33K	48.0%	3.52K	1.83K
Class A Common Stock Indirect	9/14/2026	S · Sale	−724.00	$231.53	$167.63K	39.5%	1.83K	1.11K
Class A Common Stock Indirect	9/14/2026	S · Sale	−918.00	$232.71	$213.63K	82.9%	1.11K	190.00
Class A Common Stock Indirect	9/14/2026	S · Sale	−190.00	$233.30	$44.33K	New position	190.00	0.00
Class A Common Stock Indirect	9/14/2026	C · Conversion	+12K	—	—	New position	0.00	12K
Class A Common Stock Indirect	9/14/2026	S · Sale	−786.00	$221.24	$173.89K	6.6%	12K	11.21K
Class A Common Stock Indirect	9/14/2026	S · Sale	−1.64K	$222.16	$363.24K	14.6%	11.21K	9.58K
Class A Common Stock Indirect	9/14/2026	S · Sale	−725.00	$223.12	$161.76K	7.6%	9.58K	8.85K
Class A Common Stock Indirect	9/14/2026	S · Sale	−525.00	$224.34	$117.78K	5.9%	8.85K	8.33K
Class A Common Stock Indirect	9/14/2026	S · Sale	−1.17K	$225.13	$263.18K	14.0%	8.33K	7.16K
Class A Common Stock Indirect	9/14/2026	S · Sale	−181.00	$226.19	$40.94K	2.5%	7.16K	6.98K
Class A Common Stock Indirect	9/14/2026	S · Sale	−163.00	$227.72	$37.12K	2.3%	6.98K	6.82K
Class A Common Stock Indirect	9/14/2026	S · Sale	−358.00	$228.60	$81.84K	5.3%	6.82K	6.46K
Class A Common Stock Indirect	9/14/2026	S · Sale	−2.94K	$229.92	$674.81K	45.4%	6.46K	3.52K
Class A Common Stock Indirect	9/14/2026	S · Sale	−1.73K	$230.51	$398.55K	49.1%	3.52K	1.79K
Class A Common Stock Indirect	9/14/2026	S · Sale	−713.00	$231.53	$165.08K	39.7%	1.79K	1.08K
Class A Common Stock Indirect	9/14/2026	S · Sale	−899.00	$232.71	$209.20K	83.2%	1.08K	182.00
Class A Common Stock Indirect	9/14/2026	S · Sale	−182.00	$233.30	$42.46K	New position	182.00	0.00
Total			+0.00		-$5.46M

Derivative Transactions2

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

12K shares

−12K

Strike price

Held after

34.20K

Exercisable

—

9/14/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

12K shares

−12K

Strike price

Held after

34.20K

Exercisable

—

9/14/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Class B Common Stock Indirect	Class A Common Stock12K shares	9/14/2026	C · Conversion	−12K		—	34.20K
Class B Common Stock Indirect	Class A Common Stock12K shares	9/14/2026	C · Conversion	−12K		—	34.20K

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