STATE OF WISCONSIN INVESTMENT BOARD
Position in BRK-B — Berkshire Hathaway Inc
CIK 854157
MADISON, WI
Position in BRK-B
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$356,071,476
-$6,222,056 QoQ
Shares Held
743,054
+3.1% QoQ
Ownership
0.053%
of shares outstanding
% of Portfolio
0.95%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in BRK-B Over Time
Shares Held
Position Value (USD)
Position in Insurance - Diversified
Financial Services · as of Mar 31, 2026STATE OF WISCONSIN INVESTMENT BOARD holds $435,739,972 across 6 Insurance - Diversified names. BRK-B ranks #1 (81.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | BRK-B |
Berkshire Hathaway Inc
This page
|
743,054 | $356,071,476 | |
| 2 | AIG |
American International Group, Inc.
|
334,387 | $25,162,621 | |
| 3 | HIG |
Hartford Insurance Group, Inc.
|
158,717 | $21,463,299 | |
| 4 | ACGL |
Arch Capital Group Ltd.
|
215,505 | $20,686,324 | |
| 5 | SLF |
Sun Life Financial Inc
|
174,700 | $10,929,232 | |
| 6 | PLGO |
Pelagos Insurance Capital Ltd
|
74,674 | $1,427,020 |
All Filings in BRK-B
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25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $356,071,476 | 743,054 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $362,293,532 | 720,767 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $359,412,345 | 714,907 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $349,370,641 | 719,210 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $399,812,066 | 750,708 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $333,632,664 | 736,041 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $355,659,471 | 772,736 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $302,801,580 | 744,350 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $321,383,251 | 764,252 | Shares | Sole | 2024-05-14 | |
| 2023-12-31 | $287,062,794 | 804,864 | Shares | Sole | 2024-02-12 | |
| 2023-09-30 | $261,004,676 | 745,089 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $239,865,879 | 703,419 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $221,746,263 | 718,160 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $208,712,300 | 675,663 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $196,404,424 | 735,542 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $247,961,951 | 908,219 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $337,384,430 | 956,007 | Shares | Sole | 2022-05-13 | |
| 2021-12-31 | $293,361,757 | 981,143 | Shares | Sole | 2022-02-11 | |
| 2021-09-30 | $264,144,781 | 967,776 | Shares | Sole | 2021-11-12 | |
| 2021-06-30 | $267,960,736 | 964,165 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $248,288,482 | 971,889 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $231,198,736 | 997,105 | Shares | Sole | 2021-02-03 | |
| 2020-09-30 | $306,264,574 | 1,438,267 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $255,917,826 | 1,433,633 | Shares | Sole | 2020-08-12 | |
| 2020-03-31 | $245,124,568 | 1,340,724 | Shares | Sole | 2020-05-06 | |
| No filing history on record for this holder in this stock. | ||||||