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Stock Option Plans | 3 Months Ended
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Mar. 31, 2026
Share-Based Payment Arrangement [Abstract] |
Stock Option Plans | Stock Option Plans On May 10, 2022, stockholders approved the Arthur J. Gallagher & Co. 2022 Long-Term Incentive Plan (which we refer to as the LTIP). For details on the LTIP, please refer to Note 8 in our Annual Report on Form 10-K for the year ended December 31, 2025. As of March 31, 2026, 1.5 million shares were available for restricted stock, restricted stock units, and performance unit awards settled with stock. Stock option grants and compensation expense (in millions):
| Three-month period ended March 31
| 2026 |  | 2025
Grant date | March 1, 2026 |  | March 1, 2025
Stock options granted | 1.5 |  |  | 0.8 |
Stock option compensation expense | $ | 20 |  |  | $ | 18 |
Stock option grants vest ratable over three years and expire seven years from the date of grant, or earlier in the event of certain employment terminations. Options granted to executive officers are not subject to forfeiture upon departure after attaining age 62. Fair value of stock options at the date of grant is estimated using the Black-Scholes model with the following weighted average assumptions:
| Three-month period ended March 31
| 2026 |  | 2025
Expected dividend yield | 1.2 | % |  | 0.8 | %
Expected risk-free interest rate | 3.6 | % |  | 4.1 | %
Volatility | 22.3 | % |  | 25.4 | %
Expected life (in years) | 5.5 |  | 5.5
The weighted average fair value per option for all options granted during the three-month periods ended March 31, 2026 and 2025, as determined on the grant date using the Black-Scholes option pricing model, was $54.96 and $98.27, respectively. The following is a summary of our stock option activity and related information for 2026 (in millions, except exercise price and year data):
| Three-month period ended March 31, 2026
| Shares Under Option |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Beginning balance | 6.7 |  | $ | 177.48 |  |  |  |  |
Granted | 1.5 |  | 228.20 |  |  |  |  |
Exercised | (0.5) |  | 95.43 |  |  |  |  |
Forfeited or canceled | (0.1) |  | 187.95 |  |  |  |  |
Ending balance | 7.6 |  | $ | 192.31 |  |  | 4.07 |  | $ | 323 |
Exercisable at end of period | 3.1 |  | $ | 132.32 |  |  | 2.22 |  | $ | 259 |
Ending unvested and expected to vest | 4.1 |  | $ | 231.76 |  |  | 5.25 |  | $ | 61 |
Options with respect to 8.2 million shares (less any shares of restricted stock issued under the LTIP - see Note 10 to these unaudited consolidated financial statements) were available for grant under the LTIP at March 31, 2026. The total intrinsic value of options exercised was $60 million and $162 million for the three-month periods ended March 31, 2026 and 2025, respectively. As of March 31, 2026, we had approximately $194 million of total unrecognized compensation expense related to nonvested options. We expect to recognize that cost over a weighted average period of approximately four years. Options outstanding and exercisable at March 31, 2026 (in millions, except exercise price and year data):
|  |  |  |  |  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Term (in years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$ | 86.17 |  |  | — |  |  | $ | 86.17 |  |  | 0.7 |  |  | 0.95 |  | $ | 86.17 |  |  | 0.7 |  |  | $ | 86.17 |
127.90 |  |  | — |  |  | 127.90 |  |  | 1.1 |  |  | 1.96 |  | 127.90 |  |  | 1.1 |  |  | 127.90 |
156.85 |  |  | — |  |  | 156.85 |  |  | 0.7 |  |  | 2.84 |  | 156.85 |  |  | 0.4 |  |  | 156.85 |
158.56 |  |  | — |  |  | 161.14 |  |  | 0.9 |  |  | 2.96 |  | 158.64 |  |  | 0.6 |  |  | 158.57 |
177.09 |  |  | — |  |  | 202.13 |  |  | 1.0 |  |  | 3.96 |  | 177.71 |  |  | 0.3 |  |  | 177.09 |
228.20 |  |  | — |  |  | 228.20 |  |  | 1.5 |  |  | 6.92 |  | 228.20 |  |  | — |  |  | — |
238.88 |  |  | — |  |  | 243.54 |  |  | 0.9 |  |  | 4.92 |  | 243.54 |  |  | — |  |  | — |
337.74 |  |  | — |  |  | 347.44 |  |  | 0.8 |  |  | 5.92 |  | 337.75 |  |  | — |  |  | — |
$ | 86.17 |  |  | — |  |  | $ | 347.44 |  |  | 7.6 |  |  | 4.07 |  | $ | 192.31 |  |  | 3.1 |  |  | $ | 132.32 |

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