ADAGE CAPITAL PARTNERS GP, L.L.C.

Position in BRK-B — Berkshire Hathaway Inc

CIK 1165408 Boston, MA

Back to BRK-B Full portfolio

Position in BRK-B

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$808,164,376

+$4,177,472 QoQ

Shares Held

1,615,069

-3.7% QoQ

Ownership

0.115%

of shares outstanding

% of Portfolio

1.14%

of 13F equity value

Holder Rank

#76

of 4,965 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in BRK-B Over Time

Shares Held

Position Value (USD)

Position in Insurance - Diversified

Financial Services · as of Jun 30, 2026

ADAGE CAPITAL PARTNERS GP, L.L.C. holds $887,988,639 across 3 Insurance - Diversified names. BRK-B ranks #1 (91.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BRK-B	Berkshire Hathaway Inc This page	1,615,069	$808,164,376
2	AIG	American International Group, Inc.	862,538	$64,284,957
3	ACGL	Arch Capital Group Ltd.	160,100	$15,539,306

All Filings in BRK-B

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26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$808,164,376	1,615,069	-3.7%	Shares	Sole	2026-08-14
2026-03-31	$803,986,904	1,677,769	+2.1%	Shares	Sole	2026-05-15
2025-12-31	$826,089,692	1,643,469	-0.1%	Shares	Sole	2026-02-17
2025-09-30	$827,243,085	1,645,469	-1.0%	Shares	Sole	2025-11-14
2025-06-30	$807,244,327	1,661,783	+4.7%	Shares	Sole	2025-08-14
2025-03-31	$845,507,498	1,587,569	-13.4%	Shares	Sole	2025-05-15
2024-12-31	$830,623,361	1,832,473	+5.1%	Shares	Sole	2025-02-14
2024-09-30	$802,404,856	1,743,373	-2.9%	Shares	Sole	2024-11-14
2024-06-30	$730,243,425	1,795,092	-0.6%	Shares	Sole	2024-08-14
2024-03-31	$759,750,119	1,806,692	-3.0%	Shares	Sole	2024-05-15
2023-12-31	$664,589,187	1,863,369	+11.8%	Shares	Sole	2024-02-14
2023-09-30	$583,588,940	1,665,969	-1.1%	Shares	Sole	2023-11-14
2023-06-30	$574,439,734	1,684,574	-5.5%	Shares	Other	2023-08-14
2023-03-31	$550,650,846	1,783,369	+1.6%	Shares	Sole	2023-05-15
2022-12-31	$542,295,264	1,755,569	-3.6%	Shares	Sole	2023-02-14
2022-09-30	$486,035,144	1,820,220	+1.1%	Shares	Sole	2022-11-14
2022-06-30	$491,533,468	1,800,357	-0.9%	Shares	Sole	2022-08-15
2022-03-31	$640,896,558	1,816,034	+7.7%	Shares	Sole	2022-05-16
2021-12-31	$504,254,231	1,686,469	-2.4%	Shares	Sole	2022-02-14
2021-09-30	$471,768,328	1,728,469	-0.5%	Shares	Sole	2021-11-15
2021-06-30	$482,766,216	1,737,069	-4.1%	Shares	Sole	2021-08-16
2021-03-31	$462,801,532	1,811,569	+2.5%	Shares	Sole	2021-05-17
2020-12-31	$409,637,541	1,766,669	-12.6%	Shares	Sole	2021-02-16
2020-09-30	$430,217,374	2,020,369	+18.7%	Shares	Sole	2020-11-16
2020-06-30	$303,889,890	1,702,369	-17.0%	Shares	Sole	2020-08-14
2020-03-31	$374,814,115	2,050,069	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.