13F filing · Sep 30, 2023

Berkshire Hathaway portfolio · Sep 30, 2023

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Berkshire Hathaway

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Hedge fundBerkshire Hathaway

Portfolio managerWarren Buffett

Performance · Latest Q—

AUM (13F)$1.7BReported long U.S. value

# of holdings1Filed 5/15/2024

13F

Mar 2026LatestDec 2025Sep 2025Jun 2025Mar 2025Dec 2024Sep 2024Jun 2024

Top Holdings

Stocks concentration

CHUBBCHUBB LIMITED

Weight100.0%

Est. gain—

Ownership · 5QLatest activityEst. entryPrice · 3M

CHUBB LIMITEDCUSIP H1467J104

100.00%8.14M$1.7B

NEW+8.14M shares

—Estimate pending for this holding

—

Methodology13F filings report quarter-end positions, not trade fills. Estimated entry prices reconstruct rolling cost basis from share changes and Yahoo quarter-average closes. Performance is a derived prior-book return, not licensed fund NAV. Options and unresolved CUSIPs are excluded from estimates.

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Frequently asked questions

What did Berkshire Hathaway hold in Sep 30, 2023?

Berkshire Hathaway reported 1 long holdings for Sep 30, 2023 in its 13F filing on Insider Deck.

What did Berkshire Hathaway buy last quarter?

Open the trades lens on the Berkshire Hathaway filing for Sep 30, 2023 to see adds, trims, new positions, and exits versus the prior report.

What is Berkshire Hathaway's largest position?

In the Sep 30, 2023 filing, one of the largest reported positions is CHUBB LIMITED.