W. R. Berkley Corporation
US ˙ NYSE ˙ US0844231029

SecurityWRB / W. R. Berkley Corporation
InstitutionState Street Corp
Latest Disclosed Ownership14,405,410 shares
Latest Disclosed Value $ 954,790,575
State Street Corp reports 3.43% decrease in ownership of WRB / W. R. Berkley Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 14,405,410 shares of W. R. Berkley Corporation (US:WRB) valued at $954,790,575 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 14,916,433 shares of W. R. Berkley Corporation. This represents a change in shares of -3.43% during the quarter. The current value of the position is $955,222,737 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F BERKLEY W R COM 084423102 14,405,410 -511,023 -3.43 954,791 -8.71 0.0330
2026-02-13 2025-12-31 13F BERKLEY W R COM 084423102 14,916,433 -4,681 -0.03 1,045,940 -8.51 0.0351
2025-11-14 2025-09-30 13F BERKLEY W R COM 084423102 14,921,114 149,605 1.01 1,143,256 5.34 0.0396
2025-08-14 2025-06-30 13F BERKLEY W R COM 084423102 14,771,509 -229,263 -1.53 1,085,263 1.67 0.0407
2025-05-15 2025-03-31 13F BERKLEY W R COM 084423102 15,000,772 -109,208 -0.72 1,067,455 20.72 0.0440
2025-02-14 2024-12-31 13F BERKLEY W R COM 084423102 15,109,980 -11,021 -0.07 884,236 3.08 0.0349
2024-11-14 2024-09-30 13F BERKLEY W R COM 084423102 15,121,001 4,947,830 48.64 857,814 7.31 0.0349
2024-08-14 2024-06-30 13F BERKLEY W R COM 084423102 10,173,171 -274,034 -2.62 799,408 -13.48 0.0349
2024-05-15 2024-03-31 13F BERKLEY W R COM 084423102 10,447,205 -447,346 -4.11 923,951 19.92 0.0413
2024-02-14 2023-12-31 13F BERKLEY W R COM 084423102 10,894,551 -213,624 -1.92 770,463 8.24 0.0375
2023-11-14 2023-09-30 13F BERKLEY W R COM 084423102 11,108,175 316,858 2.94 711,825 10.75 0.0395
2023-08-14 2023-06-30 13F BERKLEY W R COM 084423102 10,791,317 515,657 5.02 642,731 0.46 0.0338
2023-05-15 2023-03-31 13F BERKLEY W R COM 084423102 10,275,660 -444,156 -4.14 639,763 -17.76 0.0361
2023-05-15 2022-12-31 13F/A-99 BERKLEY W R COM 084423102 10,719,816 -302,493 -2.74 777,937 9.12 0.0457
2023-05-15 2022-12-31 13F BERKLEY W R COM 084423102 10,719,816 -302,493 777,937 0.0457
2022-11-15 2022-09-30 13F BERKLEY W R COM 084423102 11,022,309 -45,137 -0.41 712,900 -6.43 0.0451
2022-08-15 2022-06-30 13F BERKLEY W R COM 084423102 11,067,446 -873,324 -7.31 761,897 -4.18 0.0457
2022-05-16 2022-03-31 13F BERKLEY W R COM 084423102 11,940,770 4,732,333 65.65 795,136 33.88 0.0393
2022-02-14 2021-12-31 13F BERKLEY W R COM 084423102 7,208,437 71,757 1.01 593,903 13.72 0.0282
2021-11-15 2021-09-30 13F BERKLEY W R COM 084423102 7,136,680 19,932 0.28 522,262 -2.22 0.0276
2021-08-16 2021-06-30 13F BERKLEY W R COM 084423102 7,116,748 84,894 1.21 534,111 0.80 0.0282
2021-07-09 2021-03-31 13F/A-1 BERKLEY W R COM 084423102 7,031,854 240,960 3.55 529,850 17.47 0.0304
2021-05-17 2021-03-31 13F BERKLEY W R COM 084423102 7,031,854 240,960 529,850 0.0304
2021-02-16 2020-12-31 13F BERKLEY W R COM 084423102 6,790,894 -560,800 -7.63 451,051 0.33 0.0276
2020-11-10 2020-09-30 13F BERKLEY W R COM 084423102 7,351,694 -411,046 -5.30 449,556 1.09 0.0307
2020-08-14 2020-06-30 13F BERKLEY W R COM 084423102 7,762,740 -415,494 -5.08 444,727 4.24 0.0323
2020-06-19 2020-03-31 13F/A-1 BERKLEY W R COM 084423102 8,178,234 -61,343 -0.74 426,658 -25.06 0.0373
2020-05-11 2020-03-31 13F BERKLEY W R COM 084423102 8,178,234 -61,343 426,658 37,469.1633
2020-02-06 2019-12-31 13F BERKLEY W R COM 084423102 8,239,577 1,618,558 24.45 569,355 18.88 0.0390
2019-11-14 2019-09-30 13F BERKLEY W R COM 084423102 6,621,019 39,912 0.61 478,935 9.40 0.0357
2019-08-14 2019-06-30 13F BERKLEY W R COM 084423102 6,581,107 2,305,157 53.91 437,781 20.64 0.0326
2019-05-15 2019-03-31 13F BERKLEY W R COM 084423102 4,275,950 318,991 8.06 362,882 24.08 0.0283
2019-02-12 2018-12-31 13F W R BERKLEY COM 084423102 3,956,959 172,183 4.55 292,459 -3.33 0.0266
2018-11-09 2018-09-30 13F BERKLEY Common equity shares 084423102 3,784,776 101,424 2.75 302,532 13.43 0.0232
2018-08-14 2018-06-30 13F BERKLEY Common equity shares 084423102 3,683,352 -252,471 -6.41 266,709 -6.79 0.0223
2018-05-15 2018-03-31 13F BERKLEY Common equity shares 084423102 3,935,823 -65,510 -1.64 286,138 -0.19 0.0243
2018-02-14 2017-12-31 13F BERKLEY Common equity shares 084423102 4,001,333 18,855 0.47 286,695 7.86 0.0231
2017-11-14 2017-09-30 13F BERKLEY Common equity shares 084423102 3,982,478 122,830 3.18 265,794 -0.45 0.0229
2017-08-14 2017-06-30 13F BERKLEY Common equity shares 084423102 3,859,648 -39,095 -1.00 266,984 -3.05 0.0236
2017-05-15 2017-03-31 13F BERKLEY Common equity shares 084423102 3,898,743 94,402 2.48 275,369 8.83 0.0246
2017-02-09 2016-12-31 13F BERKLEY Common equity shares 084423102 3,804,341 -15,667 -0.41 253,033 14.68 0.0238
2017-01-13 2016-09-30 13F/A-1 BERKLEY Common equity shares 084423102 3,820,008 -25,710 -0.67 220,651 -4.25 0.0222
2016-11-14 2016-09-30 13F BERKLEY Common equity shares 084423102 3,809,634 220,051
2016-08-12 2016-06-30 13F BERKLEY Common equity shares 084423102 3,845,718 -83,346 -2.12 230,444 4.36 0.0248
2016-05-20 2016-03-31 13F/A-1 BERKLEY Common equity shares 084423102 3,929,064 74,823 1.94 220,818 4.64 0.0239
2016-05-12 2016-03-31 13F BERKLEY Common equity shares 084423102 3,929,064 220,818
2016-02-16 2015-12-31 13F BERKLEY Common equity shares 084423102 3,854,241 33,133 0.87 211,020 1.57 0.0231
2015-11-16 2015-09-30 13F BERKLEY Common equity shares 084423102 3,821,108 45,203 1.20 207,757 5.95 0.0242
2015-08-13 2015-06-30 13F BERKLEY Common equity shares 084423102 3,775,905 -40,075 -1.05 196,088 1.74 0.0210
2015-05-15 2015-03-31 13F BERKLEY Common equity shares 084423102 3,815,980 -4,442 -0.12 192,742 -1.58 0.0198
2015-02-11 2014-12-31 13F BERKLEY Common equity shares 084423102 3,820,422 4,007 0.10 195,837 7.36 0.0195
2014-11-12 2014-09-30 13F/A-1 BERKLEY Common equity shares 084423102 3,816,415 -10,393 -0.27 182,418 2.93 0.0196
2014-11-10 2014-09-30 13F BERKLEY Common equity shares 084423102 3,816,415 182,418
2014-08-12 2014-06-30 13F BERKLEY Common equity shares 084423102 3,826,808 -9,098 -0.24 177,229 11.01 0.0191
2014-05-15 2014-03-31 13F/A-1 BERKLEY Common equity shares 084423102 3,835,906 -162,207 -4.06 159,650 -7.97 0.0181
2014-05-13 2014-03-31 13F BERKLEY Common equity shares 084423102 3,836,785 159,687
2014-02-06 2013-12-31 13F/A-1 BERKLEY Common equity shares 084423102 3,998,113 -36,741 -0.91 173,473 0.31 0.0193
2014-02-06 2013-12-31 13F BERKLEY Common equity shares 084423102 3,971,684 149,892
2013-11-12 2013-09-30 13F BERKLEY Common equity shares 084423102 4,034,854 -30,544 -0.75 172,929 4.11 0.0213
2013-08-08 2013-06-30 13F BERKLEY Common equity shares 084423102 4,065,398 4,065,398 166,103 0.0217
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.