BAY WALTER D. (General Counsel) sold 14.4% of their position (12K shares) of ARTHUR J. GALLAGHER & CO. on the open market

Open‑market sale worth $3.24M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

BAY WALTER D.

Filed: 8/26/2026ACC: 0000354190-26-000199

InsiderBAY WALTER D.CIK 1410235

→

IssuerARTHUR J. GALLAGHER & CO.CIK 354190

Officer· General Counsel

Since Mar 2026

-12K

Net shares

Net seller

$3.24M

Total sold

Open market trades

0B · 1S

Total transactions

12K disposed

Non-Derivative Transactions1

Common Stock

Direct

S · Sale

−12K

Price / share

$270.08

Trade value

$3.24M

% of position

14.4%

8/24/2026

83.29K→71.29K

Total

Net shares

−12K

Net value

-$3.24M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/24/2026	S · Sale	−12K	$270.08	$3.24M	14.4%	83.29K	71.29K
Total			−12K		-$3.24M

Derivative Transactions0

No derivative transactions reported

Non-Derivative Holdings (Post-Transaction)1

Common Stock

Indirect

Shares owned491.13

Total

491.13 indirect491.13

Security Title	Shares Owned	Ownership Type
Common Stock	491.13	Indirect
Total	491.13	491.13 indirect

Derivative Holdings (Post-Transaction)9

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

17.63K

Shares owned

17.63K

Exercise price

86.17

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

16.95K

Shares owned

16.95K

Exercise price

228.20

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

24.50K

Shares owned

24.50K

Exercise price

127.90

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

11.40K

Shares owned

11.40K

Exercise price

158.56

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

11.35K

Shares owned

11.35K

Exercise price

337.74

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

10.88K

Shares owned

10.88K

Exercise price

243.54

Expiration

—

Exercise window

—

Non-qualified Stock Option

Direct

Underlying security

Common Stock

Underlying shares

9.45K

Shares owned

9.45K

Exercise price

177.09

Expiration

—

Exercise window

—

Phantom Stock

Direct

Underlying security

Common Stock

Underlying shares

4.01K

Shares owned

4.01K

Exercise price

Expiration

—

Exercise window

—

Notional Stock Units

Direct

Underlying security

Common Stock

Underlying shares

5.83K

Shares owned

5.83K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

112.01K

Owned

112.01K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Non-qualified Stock Option Direct	Common Stock	86.17	—	—	17.63K	17.63K
Non-qualified Stock Option Direct	Common Stock	228.20	—	—	16.95K	16.95K
Non-qualified Stock Option Direct	Common Stock	127.90	—	—	24.50K	24.50K
Non-qualified Stock Option Direct	Common Stock	158.56	—	—	11.40K	11.40K
Non-qualified Stock Option Direct	Common Stock	337.74	—	—	11.35K	11.35K
Non-qualified Stock Option Direct	Common Stock	243.54	—	—	10.88K	10.88K
Non-qualified Stock Option Direct	Common Stock	177.09	—	—	9.45K	9.45K
Phantom Stock Direct	Common Stock		—	—	4.01K	4.01K
Notional Stock Units Direct	Common Stock	0	—	—	5.83K	5.83K
Total					112.01K	112.01K