GALLAGHER J PATRICK JR 4

4 · Arthur J. Gallagher & Co. · Filed Mar 4, 2026

Insider Transaction Report

Form 4

Period: 2026-03-02

Arthur J. Gallagher & Co.AJG

GALLAGHER J PATRICK JR

DirectorCEO

Transactions

Exercise/Conversion
Common Stock
2026-03-02$79.59/sh+44,050$3,505,940→ 123,904.934 total
Sale
Common Stock
[F1][F2]
2026-03-02$230.31/sh−27,450$6,322,064→ 96,454.934 total
Gift
Common Stock
2026-03-03−1,350→ 95,104.934 total
Gift
Common Stock
[F3]
2026-03-03−1,350→ 270,175 total(indirect: By Spouse)
Gift
Common Stock
[F4]
2026-03-03+600→ 219,955 total(indirect: By Trust)
Discretionary Transaction
Notional Stock Units
[F6][F7][F8]
2026-03-03$225.23/sh+91,769.428$20,669,228→ 153,072.954 total
Exercise: $0.00→ Common Stock (91,769.428 underlying)
Exercise/Conversion
Non-qualified Stock Option
[F9]
2026-03-02−44,050→ 0 total
Exercise: $79.59Exp: 2026-03-14→ Common Stock (44,050 underlying)

Holdings

Common Stock
[F5]
(indirect: By Trust)
5,328
Common Stock
(indirect: By Corporation)
255,965
Common Stock
(indirect: By Trust)
66,703
Common Stock
(indirect: By 401(k))
418.702
Phantom Stock
[F10][F11]
→ Common Stock (136,060.984 underlying)
136,060.984
Non-qualified Stock Option
[F9]
Exercise: $86.17Exp: 2027-03-12→ Common Stock (68,550 underlying)
68,550
Non-qualified Stock Option
[F9]
Exercise: $127.90Exp: 2028-03-16→ Common Stock (76,975 underlying)
76,975
Non-qualified Stock Option
[F9]
Exercise: $158.56Exp: 2029-03-15→ Common Stock (35,825 underlying)
35,825
Non-qualified Stock Option
[F12]
Exercise: $177.09Exp: 2030-03-15→ Common Stock (30,029 underlying)
30,029
Non-qualified Stock Option
[F13]
Exercise: $243.54Exp: 2031-03-01→ Common Stock (27,210 underlying)
27,210
Non-qualified Stock Option
[F9]
Exercise: $337.74Exp: 2032-03-01→ Common Stock (22,727 underlying)
22,727
Non-qualified Stock Option
[F14]
Exercise: $228.20Exp: 2033-03-01→ Common Stock (48,449 underlying)
48,449

Footnotes (14)

[F1]Covers tax obligations and the exercise price relating to the exercise of expiring stock options.
[F10]Each share of phantom stock represents a right to receive one share of Gallagher common stock.
[F11]These shares represent awards under the Age 62 Plan, a nonqualified deferred compensation plan of the Company, which have been deemed invested in Company common stock at the election of the reporting person. Participants vest in these awards when they attain age 62, or after a one-year period for participants who have attained age 61.
[F12]One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.
[F13]One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.
[F14]One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.
[F2]The price reported is an average weighted price. The shares were sold in multiple transactions at prices ranging from $230.210 to $230.780. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
[F3]Shares held in revocable trust of which my spouse is sole Trustee and as to which I disclaim beneficial ownership.
[F4]Held in trust for benefit of children.
[F5]Shares held in trust for the benefit of my children of which I am sole Trustee.
[F6]Each notional stock unit represents a right to receive one share of Gallagher common stock.
[F7]The reporting person moved $20,669,228.36 in assets that he holds in the company's Supplemental Savings and Thrift Plan, a nonqualified deferred compensation plan, into the investment option representing Gallagher common stock, which is a discretionary transaction by the reporting person.
[F8]The notional stock units become payable following the reporting person's separation from service with Gallagher.
[F9]One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.

Signature

/s/ Monica Norzagaray, by power of attorney|2026-03-04

Documents

1 file

4
form4.xmlPrimary
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