X0306 4 2022-10-19 1 0000775368 ALLEGHANY CORP /DE Y 0001361747 Kirby Jefferson ALLEGHANY CORPORATION 1411 BROADWAY, 34TH FLOOR NEW YORK NY 10018 1 0 0 0 Common Stock 2022-10-19 4 D 0 93760.82 D 0 D Common Stock 2022-10-19 4 D 0 159097 D 0 I Held by trusts w. reporting person as co-trustee and beneficiary Common Stock 2022-10-19 4 D 0 23707 D 0 I Held by trust w. reporting person as co-trustee and beneficiaries as reporting person's descendants Common Stock 2022-10-19 4 D 0 24886 D 0 I Held by trusts w. reporting person as trustee and beneficiaries as reporting person's children Common Stock 2022-10-19 4 D 0 27586 D 0 I Held by trust w. reporting person as trustee and beneficiary Common Stock 2022-10-19 4 D 0 3853 D 0 I Held by trust w. reporting person as trustee and beneficiaries as reporting person's descendants Common Stock 2022-10-19 4 D 0 19 D 0 I Held by reporting person's spouse Common Stock 2022-10-19 4 D 0 182 D 0 I Held by reporting person's children sharing the same household Disposition pursuant to the merger (the "Merger") of O&M Acquisition Corp. with and into Alleghany Corporation ("Alleghany"), pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated as of March 20, 2022, by and among Alleghany, Berkshire Hathaway Inc. and O&M Acquisition Corp. At the effective time of the Merger, each share of Alleghany common stock was converted into the right to receive $848.02 in cash, without interest (the "Merger Consideration"). At the effective time of the Merger, each restricted stock unit that was not subject to any performance-based vesting requirements granted to non-employee directors under Alleghany's directors' stock plans ("Director RSU") was cancelled and converted into the right to receive an amount equal to the Merger Consideration at the time specified in the applicable plan and award agreement or applicable deferral election, subject to the terms set forth in the Merger Agreement. Includes 832.82 shares of Alleghany common stock underlying Mr. Kirby's Director RSUs. Reflects transfer of ownership from trust to personal holdings. Reflects that a child of the reporting person has left his household. /s/ Christopher K. Dalrymple, Attorney-in-Fact 2022-10-21