W. R. Berkley Corporation
US ˙ NYSE ˙ US0844231029

SecurityWRB / W. R. Berkley Corporation
InstitutionTrexquant Investment LP
Latest Disclosed Ownership169,329 shares
Latest Disclosed Value $ 11,223,126
Trexquant Investment LP reports 71.96% increase in ownership of WRB / W. R. Berkley Corporation

On May 15, 2026 - Trexquant Investment LP filed a 13F-HR form disclosing ownership of 169,329 shares of W. R. Berkley Corporation (US:WRB) valued at $11,223,126 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 98,470 shares of W. R. Berkley Corporation. This represents a change in shares of 71.96% during the quarter. The current value of the position is $11,610,890 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 169,329 70,859 71.96 11,223 62.56 0.0806
2026-02-17 2025-12-31 13F BERKLEY W R COM 084423102 98,470 98,470 6,905 0.0616
2025-11-14 2025-09-30 13F BERKLEY W R COM 084423102 0 -75,867 -100.00 0 -100.00
2025-08-12 2025-06-30 13F BERKLEY W R COM 084423102 75,867 -85,343 -52.94 5,574 -51.42 0.0629
2025-05-14 2025-03-31 13F BERKLEY W R COM 084423102 161,210 62,315 63.01 11,472 98.22 0.1335
2025-02-12 2024-12-31 13F BERKLEY W R COM 084423102 98,895 98,895 5,787 0.0675
2024-08-13 2024-06-30 13F BERKLEY W R COM 084423102 0 -22,248 -100.00 0 -100.00
2024-05-14 2024-03-31 13F BERKLEY W R COM 084423102 22,248 -43,417 -66.12 1,968 -57.64 0.0392
2024-02-09 2023-12-31 13F BERKLEY W R COM 084423102 65,665 4,928 8.11 4,644 20.41 0.1045
2023-11-13 2023-09-30 13F BERKLEY W R COM 084423102 60,737 14,695 31.92 3,856 40.63 0.0967
2023-08-11 2023-06-30 13F BERKLEY W R COM 084423102 46,042 -15,783 -25.53 2,742 -28.76 0.0719
2023-05-15 2023-03-31 13F BERKLEY W R COM 084423102 61,825 57,003 1,182.14 3,849 1,002.87 0.1057
2023-02-13 2022-12-31 13F BERKLEY W R COM 084423102 4,822 4,822 350 0.0099
2022-11-14 2022-09-30 13F BERKLEY W R COM 084423102 0 -55,110 -100.00 0 -100.00
2022-08-11 2022-06-30 13F BERKLEY W R COM 084423102 55,110 40,790 284.85 3,762 294.34 0.1686
2022-05-13 2022-03-31 13F BERKLEY W R COM 084423102 14,320 14,320 954 0.0448
2022-02-11 2021-12-31 13F BERKLEY W R COM 084423102 0 -4,997 -100.00 0 -100.00
2021-11-12 2021-09-30 13F BERKLEY W R COM 084423102 4,997 -10,684 -68.13 366 -68.64 0.0291
2021-08-12 2021-06-30 13F BERKLEY W R COM 084423102 15,681 10,949 231.38 1,167 226.89 0.0985
2021-05-13 2021-03-31 13F BERKLEY W R COM 084423102 4,732 -1,801 -27.57 357 -17.74 0.0327
2021-02-11 2020-12-31 13F BERKLEY W R COM 084423102 6,533 -9,164 -58.38 434 -54.79 0.0460
2020-11-06 2020-09-30 13F BERKLEY W R COM 084423102 15,697 15,697 960 0.0618
2020-08-07 2020-06-30 13F BERKLEY W R COM 084423102 0 -22,717 -100.00 0 -100.00
2020-05-08 2020-03-31 13F BERKLEY W R COM 084423102 22,717 -21,291 -48.38 1,185 -61.03 0.0860
2020-02-12 2019-12-31 13F BERKLEY W R COM 084423102 44,008 30,863 234.79 3,041 220.44 0.1799
2020-02-18 2019-09-30 13F/A-1 BERKLEY W R COM 084423102 13,145 13,145 949 0.0820
2019-11-08 2019-09-30 13F BERKLEY W R COM 084423102 13,145 13,145 949 81,962.6824
2018-05-03 2018-03-31 13F BERKLEY W R COM 084423102 0 -5,681 -100.00 0 -100.00
2018-02-08 2017-12-31 13F BERKLEY W R COM 084423102 5,681 5,681 407 0.0447
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.