GALLAGHER THOMAS JOSEPH (President) exercised options at ARTHUR J. GALLAGHER & CO.

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

M · 1 exercise

GALLAGHER THOMAS JOSEPH

Filed: 4/2/2026ACC: 0000354190-26-000124

InsiderGALLAGHER THOMAS JOSEPHCIK 1589933

→

IssuerARTHUR J. GALLAGHER & CO.CIK 354190

Officer· President

Since Mar 2026

-76.38

Net shares

Net seller

$16.5K

Total sold

Open market trades

0B · 0S

Total transactions

76.38 acquired · 152.76 disposed

Non-Derivative Transactions2

Common Stock

Direct

M · Option Exercise

+76.38

Price / share

$215.95

Trade value

$16.49K

% of position

0.0%

3/31/2026

323.39K→323.47K

Common Stock

Direct

F · Tax Withholding

−76.38

Price / share

$215.95

Trade value

$16.49K

% of position

0.0%

3/31/2026

323.47K→323.39K

Total

Net shares

+0.00

Net value

$0.00

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/31/2026	M · Option Exercise	+76.38	$215.95	$16.49K	0.0%	323.39K	323.47K
Common Stock Direct	3/31/2026	F · Tax Withholding	−76.38	$215.95	$16.49K	0.0%	323.47K	323.39K
Total			+0.00		$0.00

Derivative Transactions1

Phantom Stock

Direct

M · Option Exercise

Converts to

Common Stock

76.38 shares

−76.38

Strike price

Held after

20.21K

Exercisable

—

3/31/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Phantom Stock Direct	Common Stock76.38 shares	3/31/2026	M · Option Exercise	−76.38		—	20.21K

Non-Derivative Holdings (Post-Transaction)5

Common Stock

Indirect

Shares owned62.30K

Common Stock

Indirect

Shares owned491.14

Common Stock

Indirect

Shares owned96.71K

Common Stock

Indirect

Shares owned119.70K

Common Stock

Indirect

Shares owned31.99K

Total

311.19K indirect311.19K

Security Title	Shares Owned	Ownership Type
Common Stock	62.30K	Indirect
Common Stock	491.14	Indirect
Common Stock	96.71K	Indirect
Common Stock	119.70K	Indirect
Common Stock	31.99K	Indirect
Total	311.19K	311.19K indirect

Derivative Holdings (Post-Transaction)8

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

14.88K

Shares owned

14.88K

Exercise price

337.74

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

12.74K

Shares owned

12.74K

Exercise price

177.09

Expiration

—

Exercise window

—

Notional Stock Units

Direct

Underlying security

Common Stock

Underlying shares

11.45K

Shares owned

11.45K

Exercise price

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

22.22K

Shares owned

22.22K

Exercise price

228.20

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

31.34K

Shares owned

31.34K

Exercise price

86.17

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

32.90K

Shares owned

32.90K

Exercise price

127.90

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

15.31K

Shares owned

15.31K

Exercise price

158.56

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

15.07K

Shares owned

15.07K

Exercise price

243.54

Expiration

—

Exercise window

—

Total

Underlying

155.90K

Owned

155.90K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Non-qualified Stock Option Direct	Common Stock	337.74	—	—	14.88K	14.88K
Non-qualified Stock Option Direct	Common Stock	177.09	—	—	12.74K	12.74K
Notional Stock Units Direct	Common Stock	0	—	—	11.45K	11.45K
Non-qualified Stock Option Direct	Common Stock	228.20	—	—	22.22K	22.22K
Non-qualified Stock Option Direct	Common Stock	86.17	—	—	31.34K	31.34K
Non-qualified Stock Option Direct	Common Stock	127.90	—	—	32.90K	32.90K
Non-qualified Stock Option Direct	Common Stock	158.56	—	—	15.31K	15.31K
Non-qualified Stock Option Direct	Common Stock	243.54	—	—	15.07K	15.07K
Total					155.90K	155.90K