X0306 4 2022-10-19 1 0000775368 ALLEGHANY CORP /DE Y 0001401851 Chippendale Ian H ALLEGHANY CORPORATION 1411 BROADWAY, 34TH FLOOR NEW YORK NY 10018 1 0 0 0 Common Stock 2022-10-19 4 D 0 2765.51 D 0 D Phantom Units 2022-10-19 4 D 0 1707 D Common Stock 1707 0 D 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. Represents number of shares of Alleghany common stock underlying Mr. Chippendale's Director RSUs. 1-for-1. Disposition pursuant to the Merger; each Phantom Unit is settled in cash. /s/ Christopher K. Dalrymple, Attorney-in-Fact 2022-10-21