W. R. Berkley Corporation
MX ˙ BMV ˙ US0844231029
SecurityMX:WRB / W. R. Berkley Corporation
InstitutionBnp Paribas Arbitrage, Sa
Latest Disclosed Ownership582,155 shares
Latest Disclosed Value $ 38,585,233
Bnp Paribas Arbitrage, Sa reports 0.12% increase in ownership of WRB / W. R. Berkley Corporation

On May 12, 2026 - Bnp Paribas Arbitrage, Sa filed a 13F-HR form disclosing ownership of 582,155 shares of W. R. Berkley Corporation (MX:WRB) valued at $38,585,233 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 581,456 shares of W. R. Berkley Corporation. This represents a change in shares of 0.12% 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)
2026-05-12 2026-03-31 13F W R Berkley Equity 084423102 582,155 699 0.12 38,585 -5.36 0.0019
2026-02-10 2025-12-31 13F W R Berkley Equity 084423102 581,456 107,392 22.65 40,772 12.25 0.0185
2025-11-13 2025-09-30 13F W R Berkley Equity 084423102 474,064 154,758 48.47 36,323 54.83 0.0194
2025-08-14 2025-06-30 13F W R Berkley Equity 084423102 319,306 -408,688 -56.14 23,459 -54.72 0.0134
2025-05-14 2025-03-31 13F W R Berkley Equity 084423102 727,994 99,324 15.80 51,804 40.81 0.0305
2025-02-14 2024-12-31 13F W R Berkley Equity 084423102 628,670 -33,289 -5.03 36,790 -2.03 0.0206
2024-11-13 2024-09-30 13F W R Berkley Equity 084423102 661,959 342,344 107.11 37,553 49.52 0.0252
2024-08-13 2024-06-30 13F W R Berkley Equity 084423102 319,615 72,848 29.52 25,115 15.08 0.0205
2024-05-01 2024-03-31 13F W R Berkley Equity 084423102 246,767 -23,803 -8.80 21,824 14.06 0.0192
2024-02-14 2023-12-31 13F/A-2 W R Berkley Equity 084423102 270,570 172,398 175.61 19,135 207.03 0.0217
2024-02-07 2023-12-31 13F/A-1 W R Berkley Equity 084423102 270,570 172,398 19,135 0.0027
2024-02-07 2023-12-31 13F W R Berkley Equity 084423102 270,570 19,135
2023-11-14 2023-09-30 13F W R Berkley Equity 084423102 98,172 -114,074 -53.75 6,233 -50.70 0.0080
2023-08-09 2023-06-30 13F W R Berkley Equity 084423102 212,246 58,716 38.24 12,641 32.26 0.0158
2023-05-12 2023-03-31 13F W R BERKLEY EQUITY 084423102 153,530 1,193 0.78 9,559 -13.54 0.0134
2023-02-14 2022-12-31 13F W R Berkley Equity 084423102 152,337 89,017 140.58 11,055 170.36 0.0170
2022-11-16 2022-09-30 13F/A-1 W R Berkley Equity 084423102 63,320 -205,890 -76.48 4,089 -77.75 0.0065
2022-11-15 2022-09-30 13F W R Berkley Equity 084423102 63,320 -205,890 4,089 0.0010
2022-08-12 2022-06-30 13F W R Berkley Equity 084423102 269,210 141,027 110.02 18,376 115.30 0.0287
2022-05-18 2022-03-31 13F/A-1 W R Berkley Equity 084423102 128,183 38,296 42.60 8,536 15.26 0.0115
2022-02-09 2021-12-31 13F W R BERKLEY EQUITY 084423102 89,887 -162,900 -64.44 7,406 -59.97 0.0105
2021-11-16 2021-09-30 13F/A-1 W R BERKLEY EQUITY 084423102 252,787 -73,959 -22.64 18,499 -23.94 0.0262
2021-11-12 2021-09-30 13F WR BERKLEY EQUITY 084423102 89,596 -237,150 5,479 0.0000
2021-08-10 2021-06-30 13F W R BERKLEY EQUITY 084423102 326,746 292,128 843.86 24,320 832.48 0.0322
2021-05-07 2021-03-31 13F W R BERKLEY EQUITY 084423102 34,618 -522 -1.49 2,608 11.79 0.0038
2021-02-10 2020-12-31 13F WR BERKLEY EQUITY 084423102 35,140 -54,456 -60.78 2,334 -57.41 0.0043
2020-10-30 2020-09-30 13F WR BERKLEY EQUITY 084423102 89,596 11,734 15.07 5,479 22.83 0.0078
2020-08-06 2020-06-30 13F WR BERKLEY EQUITY 084423102 77,862 -76,132 -49.44 4,461 -44.48 0.0079
2020-05-13 2020-03-31 13F WR BERKLEY EQUITY 084423102 153,994 -52,793 -25.53 8,034 -43.78 0.0165
2020-02-12 2019-12-31 13F WR BERKLEY EQUITY 084423102 206,787 84,823 69.55 14,289 62.20 0.0260
2019-11-07 2019-09-30 13F WR BERKLEY EQUITY 084423102 121,964 71,493 141.65 8,809 164.77 0.0156
2019-07-30 2019-06-30 13F WR BERKLEY EQUITY 084423102 50,471 30,027 146.87 3,328 92.09 0.0066
2019-04-25 2019-03-31 13F WR BERKLEY EQUITY 084423102 20,444 -4,470 -17.94 1,732 -5.92 0.0037
2019-02-12 2018-12-31 13F WR BERKLEY EQUITY 084423102 24,914 -13,508 -35.16 1,841 -40.05 0.0043
2018-11-07 2018-09-30 13F WR BERKLEY EQUITY 084423102 38,422 5,736 17.55 3,071 29.80 0.0045
2018-07-25 2018-06-30 13F WR BERKLEY EQUITY 084423102 32,686 11,026 50.90 2,367 50.32 0.0039
2018-05-11 2018-03-31 13F WR BERKLEY EQUITY 084423102 21,660 -20,137 -48.18 1,575 -47.43 0.0029
2018-03-05 2017-12-31 13F/A-1 WR BERKLEY EQUITY 084423102 41,797 2,390 6.06 2,995 13.84 0.0053
2018-02-01 2017-12-31 13F WR BERKLEY EQUITY 084423102 41,797 2,390 2,995
2017-11-03 2017-09-30 13F BERKLEY W R STOCK 084423102 39,407 -9,958 -20.17 2,630 -22.96 0.0064
2017-08-03 2017-06-30 13F BERKLEY W R STOCK 084423102 49,365 13,625 38.12 3,415 35.26 0.0103
2017-05-03 2017-03-31 13F BERKLEY W R STOCK 084423102 35,740 -4,107 -10.31 2,524 -4.75 0.0067
2017-02-14 2016-12-31 13F BERKLEY W R STOCK 084423102 39,847 9,500 31.30 2,650 51.26 0.0124
2016-10-05 2016-09-30 13F * BERKLEY W R CORP COM STOCK 084423102 30,347 -36,602 -54.67 1,753 -56.32 0.0072
2016-07-06 2016-06-30 13F * BERKLEY W R CORP COM STOCK 084423102 66,949 40,289 151.12 4,012 167.76 0.0181
2016-04-22 2016-03-31 13F * BERKLEY W R CORP COM STOCK 084423102 26,660 1,599 6.38 1,498 9.18 0.0063
2016-04-19 2015-12-31 13F/A-1 * BERKLEY W R CORP COM STOCK 084423102 25,061 25,061 0.00 1,372 0.0067
2016-02-10 2015-12-31 13F * BERKLEY W R CORP COM STOCK 084423102 25,061 1,372
2015-11-13 2015-09-30 13F BERKLEY W R CORP COM STOCK 084423102 0 -18,559 -100.00 0 -100.00
2015-08-14 2015-06-30 13F BERKLEY W R CORP COM STOCK 084423102 18,559 -5,370 -22.44 964 -20.28 0.0027
2015-05-15 2015-03-31 13F * BERKLEY W R CORP COM STOCK 084423102 23,929 17,165 253.77 1,209 249.13 0.0033
2015-03-10 2014-12-31 13F/A-1 * BERKLEY W R CORP COM STOCK 084423102 6,764 -14,382 -68.01 347 -65.74 0.0012
2015-02-11 2014-12-31 13F * BERKLEY W R CORP COM STOCK 084423102 6,764 347
2014-11-12 2014-09-30 13F * BERKLEY W R CORP COM STOCK 084423102 21,146 6,636 45.73 1,011 50.52 0.0009
2014-08-14 2014-06-30 13F/A-1 * BERKLEY W R CORP COM STOCK 084423102 14,510 -20,305 -58.32 672 -56.43 0.0006
2014-08-14 2014-06-30 13F BERKLEY W R CORP COM STOCK 084423102 14,510 672
2014-05-13 2014-03-31 13F BERKLEY W R STOCK 084423102 34,815 9,868 39.56 1,540 42.33 0.0012
2014-04-02 2013-12-31 13F/A-1 BERKLEY W R STOCK 084423102 24,947 7,630 44.06 1,082 45.82 0.0008
2014-02-12 2013-12-31 13F BERKLEY W R STOCK 084423102 24,947 1,082
2013-11-13 2013-09-30 13F BERKLEY W R STOCK 084423102 17,317 -11,406 -39.71 742 -36.74 0.0005
2013-08-13 2013-06-30 13F BERKLEY W R STOCK 084423102 28,723 28,723 1,174 0.0008
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.