Item 9B. Other Information.

Rule 10b5-1 Trading Plans

The following Section 16 officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted "Rule 10b5-1 trading arrangements," as defined in Regulation S-K, Item 408, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act:

• John Doyle, our Chief Executive Officer, adopted a trading plan on December 2, 2025, which provides for the exercise and sale of an aggregate of 66,623 options. The plan's maximum length is until December 1, 2026, subject to early termination for certain specified events set forth in the plan.

• Paul Beswick, our Senior Vice President and Chief Information Officer, adopted a new trading plan on December 8, 2025, which provides for the sale of up to 7,920 shares subject to performance stock units ("PSUs"), excluding any shares withheld by the Company to satisfy its income tax withholding obligations in connection with the net settlement of equity awards. The plan’s maximum length is until December 7, 2026, subject to early termination for certain specified events set forth in the plan.

• Dean Klisura, our President and Chief Executive Officer of Guy Carpenter and Vice Chair, Marsh, adopted a new trading plan on December 10, 2025, which provides for the (1) sale of up to 10,662 shares subject to PSUs, excluding any shares withheld by the Company to satisfy its income tax withholding obligations in connection with the net settlement of equity awards and (2) exercise and sale of 10,516 stock options. The plan’s maximum length is until December 8, 2026, subject to early termination for certain specified events set forth in the plan.

• Mark McGivney, our Chief Financial Officer, adopted a new trading plan on December 8, 2025, which provides for the (1) sale of up to 20,410 shares subject to PSUs, excluding any shares withheld by the Company to satisfy its income tax withholding obligations in connection with the net settlement of equity awards and (2) exercise and sale of 67,421 stock options. The plan’s maximum length is until December 7, 2026, subject to early termination for certain specified events set forth in the plan.

• Stacy Mills, our Vice President and Controller, adopted a new trading plan on December 8, 2025, which provides for the (1) sale of up to 1,524 shares subject to PSUs, (2) sale of 1,381 shares subject to restricted stock units ("RSUs"), in each case excluding any shares withheld by the Company to satisfy its income tax withholding obligations in connection with the net settlement of equity awards and (3) exercise and sale of 4,207 stock options. The plan’s maximum length is until December 7, 2026, subject to early termination for certain specified events set forth in the plan.

The actual number of shares subject to PSUs that may be sold pursuant to each plan described above is subject to satisfaction of the applicable performance conditions and may vary from the number above.

PART III