LE-QUOC ALEXIS (President & CTO) sold 8.1% of their position (43.22K shares) of DATADOG, INC. on the open market

Open‑market sale worth $10.90M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 8 sales

LE-QUOC ALEXIS

Filed: 9/25/2026ACC: 0001561550-26-000320

InsiderLE-QUOC ALEXISCIK 1783984

→

IssuerDATADOG, INC.CIK 1561550

DirectorOfficer· President & CTO

Since Sep 2019

-43.22K

Net shares

Net seller

$10.90M

Total sold

Open market trades

0B · 8S

Total transactions

43.22K acquired · 86.45K disposed

Non-Derivative Transactions9

Class A Common Stock

Direct

C · Conversion

+43.22K

Price / share

—

Trade value

—

% of position

8.9%

9/23/2026

488.03K→531.26K

Class A Common Stock

Direct

S · Sale

−645.00

Price / share

$249.21

Trade value

$160.74K

% of position

0.1%

9/23/2026

531.26K→530.61K

Class A Common Stock

Direct

S · Sale

−1.37K

Price / share

$250.55

Trade value

$343.76K

% of position

0.3%

9/23/2026

530.61K→529.24K

Class A Common Stock

Direct

S · Sale

−22.01K

Price / share

$251.45

Trade value

$5.53M

% of position

4.2%

9/23/2026

529.24K→507.23K

Class A Common Stock

Direct

S · Sale

−9.63K

Price / share

$252.36

Trade value

$2.43M

% of position

1.9%

9/23/2026

507.23K→497.60K

Class A Common Stock

Direct

S · Sale

−5.35K

Price / share

$253.32

Trade value

$1.35M

% of position

1.1%

9/23/2026

497.60K→492.25K

Class A Common Stock

Direct

S · Sale

−2K

Price / share

$254.35

Trade value

$508.70K

% of position

0.4%

9/23/2026

492.25K→490.25K

Class A Common Stock

Direct

S · Sale

−1.60K

Price / share

$255.59

Trade value

$408.95K

% of position

0.3%

9/23/2026

490.25K→488.65K

Class A Common Stock

Direct

S · Sale

−620.00

Price / share

$256.15

Trade value

$158.81K

% of position

0.1%

9/23/2026

488.65K→488.03K

Total

Net shares

+0.00

Net value

-$10.90M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	9/23/2026	C · Conversion	+43.22K	—	—	8.9%	488.03K	531.26K
Class A Common Stock Direct	9/23/2026	S · Sale	−645.00	$249.21	$160.74K	0.1%	531.26K	530.61K
Class A Common Stock Direct	9/23/2026	S · Sale	−1.37K	$250.55	$343.76K	0.3%	530.61K	529.24K
Class A Common Stock Direct	9/23/2026	S · Sale	−22.01K	$251.45	$5.53M	4.2%	529.24K	507.23K
Class A Common Stock Direct	9/23/2026	S · Sale	−9.63K	$252.36	$2.43M	1.9%	507.23K	497.60K
Class A Common Stock Direct	9/23/2026	S · Sale	−5.35K	$253.32	$1.35M	1.1%	497.60K	492.25K
Class A Common Stock Direct	9/23/2026	S · Sale	−2K	$254.35	$508.70K	0.4%	492.25K	490.25K
Class A Common Stock Direct	9/23/2026	S · Sale	−1.60K	$255.59	$408.95K	0.3%	490.25K	488.65K
Class A Common Stock Direct	9/23/2026	S · Sale	−620.00	$256.15	$158.81K	0.1%	488.65K	488.03K
Total			+0.00		-$10.90M

Derivative Transactions1

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

43.22K shares

−43.22K

Strike price

Held after

2.16M

Exercisable

—

9/23/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Class B Common Stock Direct	Class A Common Stock43.22K shares	9/23/2026	C · Conversion	−43.22K		—	2.16M

Non-Derivative Holdings (Post-Transaction)1

Class A Common Stock

Indirect

Shares owned169.00

Total

169.00 indirect169.00

Security Title	Shares Owned	Ownership Type
Class A Common Stock	169.00	Indirect
Total	169.00	169.00 indirect

Derivative Holdings (Post-Transaction)1

Class B Common Stock

Indirect

Underlying security

Class A Common Stock

Underlying shares

6.15M

Shares owned

6.15M

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

6.15M

Owned

6.15M

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Class B Common Stock Indirect	Class A Common Stock		—	—	6.15M	6.15M
Total					6.15M	6.15M