Michael J. O'Sullivan, the See Remarks of $BRK.B, bought 483 shares of the company on 05-06-2026 for an estimated $225,623. This trade was reported by Quiver Quantitative using data from a recent SEC filing. This increased their holdings of this class of stock by approximately 380.3%. Following this trade, they now own 610 shares of this class of $BRK.B stock.
$BRK.B Insider Trading Activity
$BRK.B insiders have traded $BRK.B stock on the open market 2 times in the past 6 months. Of those trades, 2 have been purchases and 0 have been sales.
Here’s a breakdown of recent trading of $BRK.B stock by insiders over the last 6 months:
- MICHAEL J. O'SULLIVAN (See Remarks) has made 2 purchases buying 536 shares for an estimated $250,545 and 0 sales.
To track insider transactions, check out Quiver Quantitative's insider trading dashboard. You can access data on insider stock transactions through the Quiver Quantitative API.
$BRK.B Hedge Fund Activity
We have seen 2,023 institutional investors add shares of $BRK.B stock to their portfolio, and 2,150 decrease their positions in their most recent quarter.
Here are some of the largest recent moves:
- UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC removed 18,303,616 shares (-69.7%) from their portfolio in Q4 2025, for an estimated $9,200,312,582
- CANERECTOR INC removed 13,797,710 shares (-99.8%) from their portfolio in Q4 2025, for an estimated $6,935,418,931
- BLACKROCK, INC. added 6,572,332 shares (+5.7%) to their portfolio in Q4 2025, for an estimated $3,303,582,679
- J. STERN & CO. LLP added 4,893,596 shares (+50165.0%) to their portfolio in Q4 2025, for an estimated $2,459,766,029
- AUTO-OWNERS INSURANCE CO removed 4,846,444 shares (-99.8%) from their portfolio in Q1 2026, for an estimated $2,313,595,436
- CORIENT PRIVATE WEALTH LLC added 3,729,753 shares (+267.9%) to their portfolio in Q4 2025, for an estimated $1,874,760,345
- VANGUARD GROUP INC added 2,777,083 shares (+1.8%) to their portfolio in Q4 2025, for an estimated $1,395,900,769
To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Quiver Quantitative API.
$BRK.B Congressional Stock Trading
Members of Congress have traded $BRK.B stock 10 times in the past 6 months. Of those trades, 3 have been purchases and 7 have been sales.
Here’s a breakdown of recent trading of $BRK.B stock by members of Congress over the last 6 months:
- SENATOR TINA SMITH has traded it 2 times. They made 0 purchases and 2 sales worth up to $500,000 on 03/31, 01/27.
- REPRESENTATIVE GILBERT RAY CISNEROS, JR. has traded it 4 times. They made 1 purchase worth up to $15,000 on 11/18 and 3 sales worth up to $45,000 on 03/25, 03/16, 12/24.
- REPRESENTATIVE MARK ALFORD sold up to $15,000 on 03/16.
- REPRESENTATIVE AUGUST PFLUGER purchased up to $50,000 on 03/13.
- REPRESENTATIVE ROBERT BRESNAHAN sold up to $100,000 on 11/19.
- REPRESENTATIVE RICHARD MCCORMICK purchased up to $15,000 on 11/05.
To track congressional stock trading, check out Quiver Quantitative's congressional trading dashboard. You can access data on congressional stock trades through the Quiver Quantitative API.
This article is not financial advice. See Quiver Quantitative's disclaimers for more information.
