ZAGORSKI MARK (Chief Executive Officer) exercised options at DOUBLEVERIFY HOLDINGS, INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 5 exercises

ZAGORSKI MARK

Filed: 9/17/2026ACC: 0001819928-26-000096

InsiderZAGORSKI MARKCIK 1709574

→

IssuerDOUBLEVERIFY HOLDINGS, INC.CIK 1819928

DirectorOfficer· Chief Executive Officer

Since Apr 2021

-40.43K

Net shares

Net seller

$419.2K

Total sold

Open market trades

0B · 0S

Total transactions

60.82K acquired · 101.25K disposed

Non-Derivative Transactions10

Common Stock

Direct

M · Option Exercise

+22.92K

Price / share

—

Trade value

—

% of position

3.9%

9/15/2026

580.36K→603.28K

Common Stock

Direct

F · Tax Withholding

−11.70K

Price / share

$13.50

Trade value

$157.96K

% of position

1.9%

9/15/2026

603.28K→591.58K

Common Stock

Direct

M · Option Exercise

+12.12K

Price / share

—

Trade value

—

% of position

2.0%

9/15/2026

591.58K→603.70K

Common Stock

Direct

F · Tax Withholding

−6.19K

Price / share

$13.50

Trade value

$83.55K

% of position

1.0%

9/15/2026

603.70K→597.51K

Common Stock

Direct

M · Option Exercise

+15.22K

Price / share

—

Trade value

—

% of position

2.5%

9/15/2026

597.51K→612.73K

Common Stock

Direct

F · Tax Withholding

−7.77K

Price / share

$13.50

Trade value

$104.89K

% of position

1.3%

9/15/2026

612.73K→604.96K

Common Stock

Direct

M · Option Exercise

+2.76K

Price / share

—

Trade value

—

% of position

0.5%

9/15/2026

604.96K→607.72K

Common Stock

Direct

F · Tax Withholding

−1.41K

Price / share

$13.50

Trade value

$19.01K

% of position

0.2%

9/15/2026

607.72K→606.31K

Common Stock

Direct

M · Option Exercise

+7.80K

Price / share

—

Trade value

—

% of position

1.3%

9/15/2026

606.31K→614.12K

Common Stock

Direct

F · Tax Withholding

−3.98K

Price / share

$13.50

Trade value

$53.77K

% of position

0.6%

9/15/2026

614.12K→610.13K

Total

Net shares

+29.77K

Net value

-$419.19K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	9/15/2026	M · Option Exercise	+22.92K	—	—	3.9%	580.36K	603.28K
Common Stock Direct	9/15/2026	F · Tax Withholding	−11.70K	$13.50	$157.96K	1.9%	603.28K	591.58K
Common Stock Direct	9/15/2026	M · Option Exercise	+12.12K	—	—	2.0%	591.58K	603.70K
Common Stock Direct	9/15/2026	F · Tax Withholding	−6.19K	$13.50	$83.55K	1.0%	603.70K	597.51K
Common Stock Direct	9/15/2026	M · Option Exercise	+15.22K	—	—	2.5%	597.51K	612.73K
Common Stock Direct	9/15/2026	F · Tax Withholding	−7.77K	$13.50	$104.89K	1.3%	612.73K	604.96K
Common Stock Direct	9/15/2026	M · Option Exercise	+2.76K	—	—	0.5%	604.96K	607.72K
Common Stock Direct	9/15/2026	F · Tax Withholding	−1.41K	$13.50	$19.01K	0.2%	607.72K	606.31K
Common Stock Direct	9/15/2026	M · Option Exercise	+7.80K	—	—	1.3%	606.31K	614.12K
Common Stock Direct	9/15/2026	F · Tax Withholding	−3.98K	$13.50	$53.77K	0.6%	614.12K	610.13K
Total			+29.77K		-$419.19K

Derivative Transactions6

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

22.92K shares

−22.92K

Strike price

Held after

206.24K

Exercisable

—

9/15/2026

Performance Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

12.12K shares

−12.12K

Strike price

Held after

60.60K

Exercisable

—

9/15/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

15.22K shares

−15.22K

Strike price

Held after

136.97K

Exercisable

—

9/15/2026

Performance Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

2.76K shares

−2.76K

Strike price

Held after

2.76K

Exercisable

—

9/15/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

7.80K shares

−7.80K

Strike price

Held after

39.01K

Exercisable

—

9/15/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

9.38K shares

−9.38K

Strike price

Held after

9.38K

Exercisable

—

9/15/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Units Direct	Common Stock22.92K shares	9/15/2026	M · Option Exercise	−22.92K	—	206.24K
Performance Stock Units Direct	Common Stock12.12K shares	9/15/2026	M · Option Exercise	−12.12K	—	60.60K
Restricted Stock Units Direct	Common Stock15.22K shares	9/15/2026	M · Option Exercise	−15.22K	—	136.97K
Performance Stock Units Direct	Common Stock2.76K shares	9/15/2026	M · Option Exercise	−2.76K	—	2.76K
Restricted Stock Units Direct	Common Stock7.80K shares	9/15/2026	M · Option Exercise	−7.80K	—	39.01K
Restricted Stock Units Direct	Common Stock9.38K shares	9/15/2026	M · Option Exercise	−9.38K	—	9.38K