Michael J. O'sullivan: insider trades filed with the SEC | OQRO
Reporting person on SEC Form 4
Michael J. O'sullivan
See Remarks
Disclosures on record
5
Companies involved
1
Their past purchases, 90 days after disclosure
1 buy, median +4.0% vs S&P 500, beat it 1 of 1 time.
Average +4.0% vs S&P 500. Each buy is one disclosure of open-market purchases in one company on one filing date, filed May 6, 2026 to May 6, 2026, measured from the first close after the filing. Past results, not a forecast.
Stock since the trade -1.9% · S&P 500 -1.1% · to Oct 1Traded 1 day after resultsStock within 4% of its 52-week high
708 → 1,108 shares held+56% of their stake
Berkshire Hathaway's See Remarks spent $205K of their very own money to buy Berkshire Hathaway shares. Their pile of Berkshire Hathaway shares grew by 57%.
Stock since the trade -1.9% · S&P 500 -1.1% · to Oct 1Traded 1 day after resultsStock within 4% of its 52-week high
663 → 708 shares held+7% of their stake
Berkshire Hathaway's See Remarks spent $23K of their very own money to buy Berkshire Hathaway shares. Their pile of Berkshire Hathaway shares grew by 7%.
Stock since the trade +6.5% · S&P 500 +4.1% · to Oct 1Traded 1 day before resultsStock within 3% of its 52-week low
127 → 610 shares held+380% of their stake
Berkshire Hathaway's See Remarks spent $226K of their very own money to buy Berkshire Hathaway shares. Their pile of Berkshire Hathaway shares grew by 380%.
Stock since the trade +6.5% · S&P 500 +4.1% · to Oct 1Traded 1 day before resultsStock within 3% of its 52-week low
610 → 663 shares held+9% of their stake
Berkshire Hathaway's See Remarks spent $25K of their very own money to buy Berkshire Hathaway shares. Their pile of Berkshire Hathaway shares grew by 9%.