Mead Christopher E 4

4 · Arthur J. Gallagher & Co. · Filed Nov 25, 2025

Form 4

Period: 2025-11-21

VICE PRESIDENT

Transactions

Holdings

Common Stock
(indirect: By 401(k))
418.658
Phantom Stock
→ Common Stock (20,125.736 underlying)
20,125.736
Non-qualified Stock Option
Exercise: $70.74Exp: 2025-03-15→ Common Stock (0 underlying)
0
Non-qualified Stock Option
Exercise: $79.59Exp: 2026-03-14→ Common Stock (8,000 underlying)
8,000
Non-qualified Stock Option
Exercise: $158.56Exp: 2029-03-15→ Common Stock (8,420 underlying)
8,420
Non-qualified Stock Option
Exercise: $243.54Exp: 2031-03-01→ Common Stock (7,368 underlying)
7,368
Common Stock (restricted)
2,367
Non-qualified Stock Option
Exercise: $55.94Exp: 2024-05-01→ Common Stock (0 underlying)
0
Non-qualified Stock Option
Exercise: $86.17Exp: 2027-03-12→ Common Stock (11,090 underlying)
11,090
Non-qualified Stock Option
Exercise: $337.74Exp: 2032-03-01→ Common Stock (8,264 underlying)
8,264
Non-qualified Stock Option
Exercise: $127.90Exp: 2028-03-16→ Common Stock (11,725 underlying)
11,725
Non-qualified Stock Option
Exercise: $177.09Exp: 2030-03-15→ Common Stock (7,009 underlying)
7,009
Notional Stock Units
→ Common Stock (1,584.532 underlying)
1,584.532

Footnotes (10)

[F1]Each share of phantom stock represents a right to receive one share of Gallagher common stock.
[F10]The notional stock units become payable following the reporting person's separation from service with Gallagher.
[F2]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.
[F3]Granted on May 1, 2017.
[F4]One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.
[F5]Granted on March 15, 2018.
[F6]One-third of this stock option becomes exerciseable on each of the 3rd, 4th, and 5th anniversaries of the grant date.
[F7]One-third of this stock option becomes exercisable on each of the 3rd, 4th, and 5th anniversaries of the grant date.
[F8]Closing price of Gallagher common stock on February 28, 2025.
[F9]Each notional stock unit represents a right to receive one share of Gallagher common stock.

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