W. R. Berkley Corporation
MX ˙ BMV ˙ US0844231029
SecurityMX:WRB / W. R. Berkley Corporation
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership6,405 shares
Latest Disclosed Value $ 424,524
Quadrant Capital Group Llc reports 6.67% decrease in ownership of WRB / W. R. Berkley Corporation

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 6,405 shares of W. R. Berkley Corporation (MX:WRB) valued at $424,524 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 6,863 shares of W. R. Berkley Corporation. This represents a change in shares of -6.67% during the quarter.

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)
2026-05-13 2026-03-31 13F/A-1 BERKLEY W R COM 084423102 6,405 -458 -6.67 425 -11.85 0.0127
2026-05-11 2026-03-31 13F BERKLEY W R COM 084423102 6,405 -458 49 0.0369
2026-02-12 2025-12-31 13F BERKLEY W R COM 084423102 6,863 66 0.97 481 -7.50 0.0145
2025-11-13 2025-09-30 13F BERKLEY W R COM 084423102 6,797 617 9.98 521 14.54 0.0169
2025-08-13 2025-06-30 13F BERKLEY W R COM 084423102 6,180 14 0.23 454 3.65 0.0163
2025-05-13 2025-03-31 13F BERKLEY W R COM 084423102 6,166 2,805 83.46 439 123.47 0.0163
2025-02-13 2024-12-31 13F BERKLEY W R COM 084423102 3,361 -234 -6.51 197 -3.45 0.0135
2024-11-12 2024-09-30 13F BERKLEY W R COM 084423102 3,595 1,192 49.60 204 7.98 0.0142
2024-08-12 2024-06-30 13F BERKLEY W R COM 084423102 2,403 202 9.18 189 -3.09 0.0140
2024-05-15 2024-03-31 13F BERKLEY W R COM 084423102 2,201 -49 -2.18 195 22.01 0.0154
2024-02-08 2023-12-31 13F BERKLEY W R COM 084423102 2,250 144 6.84 159 19.55 0.0137
2023-11-14 2023-09-30 13F BERKLEY W R COM 084423102 2,106 481 29.60 134 38.54 0.0134
2023-08-10 2023-06-30 13F BERKLEY W R COM 084423102 1,625 82 5.31 97 0.00 0.0096
2023-05-11 2023-03-31 13F BERKLEY W R COM 084423102 1,543 595 62.76 96 41.18 0.0100
2023-02-13 2022-12-31 13F BERKLEY W R COM 084423102 948 70 7.97 69 19.30 0.0078
2022-11-10 2022-09-30 13F BERKLEY W R COM 084423102 878 96 12.28 57 7.55 0.0075
2022-08-09 2022-06-30 13F BERKLEY W R COM 084423102 782 9 1.16 53 3.92 0.0071
2022-05-06 2022-03-31 13F BERKLEY W R COM 084423102 773 261 50.98 51 21.43 0.0062
2022-02-01 2021-12-31 13F BERKLEY W R COM 084423102 512 -35 -6.40 42 5.00 0.0050
2021-11-12 2021-09-30 13F BERKLEY W R COM 084423102 547 7 1.30 40 0.00 0.0056
2021-08-09 2021-06-30 13F BERKLEY W R COM 084423102 540 -55 -9.24 40 -11.11 0.0058
2021-05-12 2021-03-31 13F BERKLEY W R COM 084423102 595 378 174.19 45 221.43 0.0073
2021-02-16 2020-12-31 13F BERKLEY W R COM 084423102 217 0 0.00 14 7.69 0.0026
2020-11-13 2020-09-30 13F BERKLEY W R COM 084423102 217 -32 -12.85 13 -7.14 0.0028
2020-08-13 2020-06-30 13F BERKLEY W R COM 084423102 249 33 15.28 14 27.27 0.0031
2020-05-15 2020-03-31 13F WR Berkley Com 084423102 216 78 56.52 11 57.14 0.0018
2020-03-19 2019-12-31 13F/A-1 WR Berkley Com 084423102 138 24 21.05 7 16.67 0.0008
2020-02-03 2019-12-31 13F WR Berkley Com 084423102 138 24 7 23.6539
2019-10-24 2019-09-30 13F WR Berkley COM 084423102 114 0 0.00 6 0.00 0.0009
2019-07-24 2019-06-30 13F WR Berkley COM 084423102 114 37 48.05 6 20.00 0.0009
2019-04-29 2019-03-31 13F WR Berkley COM 084423102 77 0 0.00 5 66.67 0.0009
2019-01-17 2018-12-31 13F WR Berkley COM 084423102 77 0 0.00 3 -40.00 0.0008
2018-10-29 2018-09-30 13F WR Berkley COM 084423102 77 0 0.00 5 66.67 0.0014
2018-08-08 2018-06-30 13F WR Berkley COM 084423102 77 0 0.00 3 0.00 0.0011
2018-05-10 2018-03-31 13F WR Berkley COM 084423102 77 0 0.00 3 0.00 0.0011
2018-01-31 2017-12-31 13F WR Berkley COM 084423102 77 0 0.00 3 0.00 0.0012
2017-10-13 2017-09-30 13F WR Berkley COM 084423102 77 27 54.00 3 200.00 0.0012
2017-08-14 2017-06-30 13F WR Berkley COM 084423102 50 0 0.00 1 -50.00 0.0004
2017-04-10 2017-03-31 13F WR Berkley COM 084423102 50 27 117.39 2 100.00 0.0009
2017-01-11 2016-12-31 13F WR Berkley COM 084423102 23 0 0.00 1 0.00 0.0005
2016-10-25 2016-09-30 13F WR Berkley COM 084423102 23 0 0.00 1 0.00 0.0007
2016-07-28 2016-06-30 13F WR Berkley COM 084423102 23 23 1 0.0007
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.