Trade Summary

Yesterday, O'Sullivan Michael J., serving as See Remarks at Berkshire Hathaway Inc (BRK), purchased 536 shares at $467.44 per share, for a total transaction value of $250,545.00. Following this transaction, O'Sullivan Michael J. now holds 663 shares of BRK.

This purchase represents a 422.00% increase in O'Sullivan Michael J.'s stake in the company. This is considered a high-conviction trade given the significant change in ownership.

The trade was executed on Wednesday, May 6, 2026 and publicly disclosed via SEC Form 4 filing on Wednesday, May 6, 2026, meaning the disclosure happened on the same day as the trade.