Walter D. Bay

CIK: 0001410235

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)3 (11.1%)

Position reduction

Option Exercises (M)10 (37.0%)

Derivative conversions

Awards (A)5 (18.5%)

Compensation grants

Other (G, F, J, C, D, …)9 (33.3%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

AJG

Arthur J. Gallagher & Co.

Officer

Discretionary Trading P&L

Holdings

Transaction History (27 total)

AJG
Arthur J. Gallagher & Co.
Aug 24, 2026
Sale(S)
Direct
12K shares at avg. $270.08$3.2M
AJG
Arthur J. Gallagher & Co.
Mar 31, 2026
Exercise(M)
Direct
1.4K shares at avg. $215.95$306K
AJG
Arthur J. Gallagher & Co.
Mar 31, 2026
Tax Payment(F)
Direct
627 shares at avg. $215.95$135K
AJG
Arthur J. Gallagher & Co.
Mar 15, 2026
Tax Payment(F)
Direct
2.4K shares at avg. $207.93$501K
AJG
Arthur J. Gallagher & Co.
Mar 15, 2026
Award(A)
Direct
7.1K shares-
AJG
Arthur J. Gallagher & Co.
Mar 15, 2026
Exercise(M)
Direct
7.1K shares-
AJG
Arthur J. Gallagher & Co.
Mar 15, 2026
Exercise(M)
Direct
7.1K shares-
AJG
Arthur J. Gallagher & Co.
Mar 4, 2026
Award(A)
Phantom Stock
Direct
2K shares at avg. $227.01-
AJG
Arthur J. Gallagher & Co.
Mar 1, 2026
Award(A)
Non-qualified Stock Option
Direct
17K shares-
AJG
Arthur J. Gallagher & Co.
Dec 19, 2025
Gift(G)
Direct
1.7K shares-
AJG
Arthur J. Gallagher & Co.
Dec 19, 2025
Sale(S)
Direct
15.9K shares at avg. $255.00$4.0M
AJG
Arthur J. Gallagher & Co.
Dec 19, 2025
Exercise(M)
Direct
15.9K shares at avg. $79.59$1.3M
AJG
Arthur J. Gallagher & Co.
Mar 31, 2025
Tax Payment(F)
Direct
79 shares at avg. $345.24$27K
AJG
Arthur J. Gallagher & Co.
Mar 31, 2025
Exercise(M)
Direct
79 shares-
AJG
Arthur J. Gallagher & Co.
Mar 15, 2025
Exercise(M)
Direct
7.2K shares-
AJG
Arthur J. Gallagher & Co.
Mar 15, 2025
Tax Payment(F)
Direct
3.1K shares at avg. $325.24$1.0M
AJG
Arthur J. Gallagher & Co.
Mar 15, 2025
Award(A)
Direct
7.2K shares-
AJG
Arthur J. Gallagher & Co.
Mar 15, 2025
Exercise(M)
Direct
7.2K shares-
AJG
Arthur J. Gallagher & Co.
Mar 12, 2025
Tax Payment(F)
Direct
945 shares at avg. $325.75$308K
AJG
Arthur J. Gallagher & Co.
Mar 12, 2025
Exercise(M)
Direct
2.3K shares-
AJG
Arthur J. Gallagher & Co.
Mar 12, 2025
Exercise(M)
Direct
2.3K shares-
AJG
Arthur J. Gallagher & Co.
Mar 10, 2025
Discretionary(I)
Phantom Stock
Direct
1.4K shares at avg. $321.23-
AJG
Arthur J. Gallagher & Co.
Mar 1, 2025
Award(A)
Non-qualified Stock Option
Direct
11.4K shares-
AJG
Arthur J. Gallagher & Co.
Feb 13, 2025
Sale(S)
Direct
10K shares at avg. $326.62$3.3M
AJG
Arthur J. Gallagher & Co.
Feb 5, 2025
Exercise(M)
Direct
94.7K shares-

		Type	Shares	Price		Ownership
Aug 24, 2026	AJG Arthur J. Gallagher & Co.	Sale(S)	12,000	$270.08	$3,240,972	Direct
Mar 31, 2026	AJG Arthur J. Gallagher & Co.	Exercise(M)	1,415	$215.95	$305,589	Direct
Mar 31, 2026	AJG Arthur J. Gallagher & Co.	Tax Payment(F)	627	$215.95	$135,401	Direct
Mar 15, 2026	AJG Arthur J. Gallagher & Co.	Tax Payment(F)	2,411	$207.93	$501,319	Direct
Mar 15, 2026	AJG Arthur J. Gallagher & Co.	Award(A)	7,090	-	$0	Direct
Mar 15, 2026	AJG Arthur J. Gallagher & Co.	Exercise(M)	7,090	-	$0	Direct
Mar 15, 2026	AJG Arthur J. Gallagher & Co.	Exercise(M)	7,090	-	$0	Direct
Mar 4, 2026	AJG Arthur J. Gallagher & Co.	Award(A) Phantom Stock	1,982	$227.01	-	Direct
Mar 1, 2026	AJG Arthur J. Gallagher & Co.	Award(A) Non-qualified Stock Option	16,952	-	-	Direct
Dec 19, 2025	AJG Arthur J. Gallagher & Co.	Gift(G)	1,724	-	-	Direct
Dec 19, 2025	AJG Arthur J. Gallagher & Co.	Sale(S)	15,850	$255.00	$4,041,750	Direct
Dec 19, 2025	AJG Arthur J. Gallagher & Co.	Exercise(M)	15,850	$79.59	$1,261,502	Direct
Mar 31, 2025	AJG Arthur J. Gallagher & Co.	Tax Payment(F)	79	$345.24	$27,189	Direct
Mar 31, 2025	AJG Arthur J. Gallagher & Co.	Exercise(M)	79	-	-	Direct
Mar 15, 2025	AJG Arthur J. Gallagher & Co.	Exercise(M)	7,180	-	-	Direct
Mar 15, 2025	AJG Arthur J. Gallagher & Co.	Tax Payment(F)	3,108	$325.24	$1,010,846	Direct
Mar 15, 2025	AJG Arthur J. Gallagher & Co.	Award(A)	7,180	-	-	Direct
Mar 15, 2025	AJG Arthur J. Gallagher & Co.	Exercise(M)	7,180	-	-	Direct
Mar 12, 2025	AJG Arthur J. Gallagher & Co.	Tax Payment(F)	945	$325.75	$307,834	Direct
Mar 12, 2025	AJG Arthur J. Gallagher & Co.	Exercise(M)	2,250	-	-	Direct
Mar 12, 2025	AJG Arthur J. Gallagher & Co.	Exercise(M)	2,250	-	-	Direct
Mar 10, 2025	AJG Arthur J. Gallagher & Co.	Discretionary(I) Phantom Stock	1,401	$321.23	-	Direct
Mar 1, 2025	AJG Arthur J. Gallagher & Co.	Award(A) Non-qualified Stock Option	11,350	-	-	Direct
Feb 13, 2025	AJG Arthur J. Gallagher & Co.	Sale(S)	10,000	$326.62	$3,266,200	Direct
Feb 5, 2025	AJG Arthur J. Gallagher & Co.	Exercise(M)	94,732	-	-	Direct

1-25 of 27 transactions

About Bay Walter D.

Bay Walter D. (SEC CIK 0001410235) files insider reports with the SEC as General Counsel of Arthur J. Gallagher & Co. (AJG).

Signal8 holds 14 ownership filings by Bay Walter D., all Form 4s, filed between Dec 11, 2024 and Aug 26, 2026. Those filings report 27 transactions, from Dec 10, 2024 to Aug 24, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Bay Walter D.'s filings is in ROLLING MEADOWS, IL.

Recent filings by Bay Walter D.

Aug 24, 2026: Open-market sale of AJG shares (Form 4, code S).
Mar 31, 2026: Option exercise of AJG shares (Form 4, code M).
Mar 31, 2026: Tax withholding of AJG shares (Form 4, code F).
Mar 15, 2026: Tax withholding of AJG shares (Form 4, code F).
Mar 15, 2026: Grant or award of AJG shares (Form 4, code A).

Other insiders filing for Arthur J. Gallagher & Co. (AJG)

Koreyva Kyle Graham, Chief Accounting Officer
CARY RICHARD C, Controller, CAO
Gallagher Patrick Murphy, Chief Operating Officer
GALLAGHER J PATRICK JR, CEO
Hudson Scott R, Vice President
Miskel Christopher C., Director

How to read Form 4 transaction codes