Asset Management One Co., Ltd.

Position in BRK-B — Berkshire Hathaway Inc

CIK 1068855 TOKYO, M0

Back to BRK-B Full portfolio

Position in BRK-B

as of Jun 30, 2026 · filed Jul 28, 2026 Compact

Position Value

$310,036,640

+$26,161,915 QoQ

Shares Held

619,590

+4.6% QoQ

Ownership

0.044%

of shares outstanding

% of Portfolio

0.92%

of 13F equity value

Holder Rank

#164

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

Asset Management One Co., Ltd. holds $360,200,229 across 4 Insurance - Diversified names. BRK-B ranks #1 (86.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BRK-B	Berkshire Hathaway Inc This page	619,590	$310,036,640
2	AIG	American International Group, Inc.	236,102	$17,596,682
3	HIG	Hartford Insurance Group, Inc.	129,191	$17,120,391
4	ACGL	Arch Capital Group Ltd.	159,144	$15,446,516

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	$310,036,640	619,590	+4.6%	Shares	Defined	2026-07-28
2026-03-31	$283,874,725	592,393	-0.6%	Shares	Defined	2026-05-08
2025-12-31	$299,524,108	595,890	+1.6%	Shares	Defined	2026-01-27
2025-09-30	$294,938,956	586,663	+1.9%	Shares	Defined	2025-10-22
2025-06-30	$279,797,690	575,988	+1.7%	Shares	Defined	2025-07-31
2025-03-31	$301,610,705	566,320	+7.3%	Shares	Defined	2025-04-23
2024-12-31	$239,253,422	527,827	+1.5%	Shares	Defined	2025-01-30
2024-09-30	$239,427,252	520,200	+3.5%	Shares	Defined	2024-10-30
2024-06-30	$204,398,694	502,455	+0.4%	Shares	Defined	2024-07-18
2024-03-31	$210,471,101	500,502	-4.3%	Shares	Defined	2024-05-02
2023-12-31	$186,502,150	522,913	+0.0%	Shares	Defined	2024-01-24
2023-09-30	$183,116,522	522,742	-0.2%	Shares	Defined	2023-10-19
2023-06-30	$178,690,820	524,020	-1.7%	Shares	Defined	2023-07-31
2023-03-31	$164,580,894	533,021	+2.2%	Shares	Defined	2023-04-25
2022-12-31	$161,117,606	521,585	-2.7%	Shares	Defined	2023-02-06
2022-09-30	$143,098,154	535,908	-1.9%	Shares	Defined	2022-11-04
2022-06-30	$149,106,596	546,138	-3.5%	Shares	Defined	2022-07-29
2022-03-31	$199,799,643	566,149	-6.5%	Shares	Defined	2022-05-13
2021-12-31	$180,987,391	605,309	-1.4%	Shares	Defined	2022-02-09
2021-09-30	$167,528,115	613,791	-8.4%	Shares	Defined	2021-11-02
2021-06-30	$186,304,227	670,352	+1.2%	Shares	Defined	2021-08-03
2021-03-31	$169,289,750	662,660	-4.2%	Shares	Defined	2021-05-14
2020-12-31	$160,402,796	691,779	-0.3%	Shares	Defined	2021-02-12
2020-09-30	$147,818,050	694,177	-3.6%	Shares	Defined	2020-11-13
2020-06-30	$128,532,912	720,032	+4.3%	Shares	Defined	2020-08-14
2020-03-31	$126,247,405	690,518	—	Shares	Defined	2020-05-14
No filing history on record for this holder in this stock.