O'Sullivan Michael J.

See Remarks at BERKSHIRE HATHAWAY INC · on record since May 5, 2026
General Counsel at Snap Inc · on record since Sep 8, 2017

Insider trading activity of O'Sullivan Michael J.

Transactions on record: 214; since Sep 8, 2017

Open-market buys: 5; $500.6K

Open-market sells: 139; $60.7M

Companies traded: 2; last filing Aug 13, 2026

Figures computed from official regulatory filings — .

Companies where O'Sullivan Michael J. has traded

BERKSHIRE HATHAWAY INC5 tx · $500.6K · Aug 13, 2026
Snap Inc209 tx · $60.7M · Nov 19, 2025

Track record of O'Sullivan Michael J.

Statistical track record

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Open-market buys: 5

Last buy: Aug 12, 2026

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Transaction history of O'Sullivan Michael J.

Co-insiders of O'Sullivan Michael J.

Abel GregoryBERKSHIRE HATHAWAY INC
Andersen DerekSnap Inc
BILL & MELINDA GATES FOUNDATION TRUSTBERKSHIRE HATHAWAY INC
Briers Zachary MSnap Inc
BUFFETT HOWARDBERKSHIRE HATHAWAY INC

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
BERKSHIRE HATHAWAY INCListing on record	Aug 13, 2026	Buy	43	513.61 USD	$22.1K	conv 37	SEC
BERKSHIRE HATHAWAY INCListing on record	Aug 13, 2026	Buy	45	510.64 USD	$23K	conv 39	SEC
BERKSHIRE HATHAWAY INCListing on record	Aug 13, 2026	Buy	400	512.52 USD	$205K	conv 56	SEC
BERKSHIRE HATHAWAY INCListing on record	May 6, 2026	Buy	483	467.13 USD	$225.6K	conv 80First in 12mo	SEC
BERKSHIRE HATHAWAY INCListing on record	May 6, 2026	Buy	53	470.22 USD	$24.9K	conv 53First in 12mo	SEC
Snap IncListing on record	Nov 19, 2025	Other	60,094	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Nov 19, 2025	Sell	-70,882	8.34 USD	$591.2K		SEC
Snap IncListing on record	Nov 19, 2025	Other	-60,094	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Nov 4, 2025	Sell	-24,000	7.73 USD	$185.5K		SEC
Snap IncListing on record	Oct 2, 2025	Sell	-24,000	7.86 USD	$188.6K		SEC
Snap IncListing on record	Sep 18, 2025	Other	13,200	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Sep 18, 2025	Other	-13,200	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Sep 18, 2025	Sell	-14,290	7.58 USD	$108.3K		SEC
Snap IncListing on record	Aug 29, 2025	Sell	-24,000	7.16 USD	$171.8K		SEC
Snap IncListing on record	Aug 20, 2025	Other	-62,270	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Aug 20, 2025	Other	62,270	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Aug 20, 2025	Sell	-68,705	7.18 USD	$493.3K		SEC
Snap IncListing on record	Aug 4, 2025	Sell	-24,000	9.57 USD	$229.7K		SEC
Snap IncListing on record	Jul 2, 2025	Sell	-24,000	8.71 USD	$209K		SEC
Snap IncListing on record	Jun 18, 2025	Sell	-14,297	8.04 USD	$114.9K		SEC
Snap IncListing on record	Jun 18, 2025	Other	13,194	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Jun 18, 2025	Other	-13,194	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Jun 3, 2025	Sell	-24,000	8.15 USD	$195.6K		SEC
Snap IncListing on record	May 19, 2025	Other	62,130	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	May 19, 2025	Sell	-68,845	8.59 USD	$591.4K		SEC

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
BERKSHIRE HATHAWAY INCListing on record	Aug 13, 2026	Buy	43	513.61 USD	$22.1K	conv 37	SEC
BERKSHIRE HATHAWAY INCListing on record	Aug 13, 2026	Buy	45	510.64 USD	$23K	conv 39	SEC
BERKSHIRE HATHAWAY INCListing on record	Aug 13, 2026	Buy	400	512.52 USD	$205K	conv 56	SEC
BERKSHIRE HATHAWAY INCListing on record	May 6, 2026	Buy	483	467.13 USD	$225.6K	conv 80First in 12mo	SEC
BERKSHIRE HATHAWAY INCListing on record	May 6, 2026	Buy	53	470.22 USD	$24.9K	conv 53First in 12mo	SEC
Snap IncListing on record	Nov 19, 2025	Other	60,094	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Nov 19, 2025	Sell	-70,882	8.34 USD	$591.2K		SEC
Snap IncListing on record	Nov 19, 2025	Other	-60,094	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Nov 4, 2025	Sell	-24,000	7.73 USD	$185.5K		SEC
Snap IncListing on record	Oct 2, 2025	Sell	-24,000	7.86 USD	$188.6K		SEC
Snap IncListing on record	Sep 18, 2025	Other	13,200	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Sep 18, 2025	Other	-13,200	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Sep 18, 2025	Sell	-14,290	7.58 USD	$108.3K		SEC
Snap IncListing on record	Aug 29, 2025	Sell	-24,000	7.16 USD	$171.8K		SEC
Snap IncListing on record	Aug 20, 2025	Other	-62,270	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Aug 20, 2025	Other	62,270	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Aug 20, 2025	Sell	-68,705	7.18 USD	$493.3K		SEC
Snap IncListing on record	Aug 4, 2025	Sell	-24,000	9.57 USD	$229.7K		SEC
Snap IncListing on record	Jul 2, 2025	Sell	-24,000	8.71 USD	$209K		SEC
Snap IncListing on record	Jun 18, 2025	Sell	-14,297	8.04 USD	$114.9K		SEC
Snap IncListing on record	Jun 18, 2025	Other	13,194	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Jun 18, 2025	Other	-13,194	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	Jun 3, 2025	Sell	-24,000	8.15 USD	$195.6K		SEC
Snap IncListing on record	May 19, 2025	Other	62,130	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Snap IncListing on record	May 19, 2025	Sell	-68,845	8.59 USD	$591.4K		SEC