O'Sullivan Michael J.

See Remarks · BERKSHIRE HATHAWAY INC

Every open-market stock purchase O'Sullivan Michael J. has reported to the SEC on Form 4 that met our signal bar, parsed straight from the filings. This page tracks where how the prices paid compare to where the stock trades now.

Total bought

$475.7K

Open-market buys

Companies

Last buy

Aug 12, 2026

Where the buys stand today

BRK.B
BERKSHIRE HATHAWAY INC
4 purchases totalling $475.7K at an average of $489.90 per share. See all insider buying in BRK.B →
Avg price paid
$489.90
Latest price
—
Market cap
Unknown

All reported buys

Date	Ticker	Shares	Price	Value	Filing
Aug 12, 2026	BRK.B	45	$510.64	$23.0K	SEC ↗
Aug 12, 2026	BRK.B	400	$512.52	$205.0K	SEC ↗
Aug 12, 2026	BRK.B	43	$513.61	$22.1K	SEC ↗
May 6, 2026	BRK.B	483	$467.13	$225.6K	SEC ↗

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About this data

Figures are parsed from O'Sullivan Michael J.'s Form 4 filings on SEC EDGAR (CIK 1713777) and cover open-market purchases (transaction code P) — grants, option exercises, and sales are excluded, which is why totals here can differ from raw filing counts. Every row links to its source document.

This page is informational and reflects public filing data. It is not investment advice.