BLOOM MARK H.

PrivateCIK: 1795399

Location

MCLEAN, VA

BLOOM MARK H. (Vice 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

BLOOM MARK H.

Filed: 8/18/2026ACC: 0000354190-26-000193

InsiderBLOOM MARK H.CIK 1795399

→

IssuerARTHUR J. GALLAGHER & CO.CIK 354190

Officer· Vice President

Since May 2022

-606.81

Net shares

Net seller

$152.4K

Total sold

0

Open market trades

0B · 0S

3

Total transactions

1.28K acquired · 1.89K disposed

Non-Derivative Transactions2

Common Stock

Direct

M · Option Exercise

Shares

+1.28K

Price / share

—

Trade value

—

% of position

34.2%

8/16/2026

3.74K→5.02K

Common Stock

Direct

F · Tax Withholding

Shares

−606.81

Price / share

$251.21

Trade value

$152.44K

% of position

12.1%

8/16/2026

5.02K→4.42K

Total

Net shares

+673.67

Net value

-$152.44K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/16/2026	M · Option Exercise	+1.28K	—	—	34.2%	3.74K	5.02K
Common Stock Direct	8/16/2026	F · Tax Withholding	−606.81	$251.21	$152.44K	12.1%	5.02K	4.42K
Total			+673.67		-$152.44K

Derivative Transactions1

Phantom Stock

Direct

M · Option Exercise

Converts to

Common Stock

1.28K shares

Shares

−1.28K

Strike price

Held after

6.02K

Exercisable

—

8/16/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Phantom Stock Direct	Common Stock1.28K shares	8/16/2026	M · Option Exercise	−1.28K		—	6.02K

Non-Derivative Holdings (Post-Transaction)1

Common Stock

Indirect

Shares owned193.26

Total

193.26 indirect193.26

Security Title	Shares Owned	Ownership Type
Common Stock	193.26	Indirect
Total	193.26	193.26 indirect

Derivative Holdings (Post-Transaction)6

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

4.67K

Shares owned

4.67K

Exercise price

177.09

Expiration

—

Exercise window

—

Notional Stock Units

Direct

Underlying security

Common Stock

Underlying shares

962.25

Shares owned

962.25

Exercise price

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

13.33K

Shares owned

13.33K

Exercise price

228.20

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

4.90K

Shares owned

4.90K

Exercise price

158.56

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

6.89K

Shares owned

6.89K

Exercise price

337.74

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

5.78K

Shares owned

5.78K

Exercise price

243.54

Expiration

—

Exercise window

—

Total

Underlying

36.53K

Owned

36.53K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Non-qualified Stock Option Direct	Common Stock	177.09	—	—	4.67K	4.67K
Notional Stock Units Direct	Common Stock		—	—	962.25	962.25
Non-qualified Stock Option Direct	Common Stock	228.20	—	—	13.33K	13.33K
Non-qualified Stock Option Direct	Common Stock	158.56	—	—	4.90K	4.90K
Non-qualified Stock Option Direct	Common Stock	337.74	—	—	6.89K	6.89K
Non-qualified Stock Option Direct	Common Stock	243.54	—	—	5.78K	5.78K
Total					36.53K	36.53K