WR伯克利公司
MX ˙ BMV ˙ US0844231029
SecurityMX:WRB / W. R. Berkley Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership2,705,395 shares
Latest Disclosed Value $ 179,313,581
Northern Trust Corp reports 6.33% decrease in ownership of WRB / W. R. Berkley Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 2,705,395 shares of W. R. Berkley Corporation (MX:WRB) valued at $179,313,581 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,888,270 shares of W. R. Berkley Corporation. This represents a change in shares of -6.33% 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)
2026-05-14 2026-03-31 13F BERKLEY W R COM 084423102 2,705,395 -182,875 -6.33 179,314 -11.46 0.0049
2026-02-17 2025-12-31 13F BERKLEY W R COM 084423102 2,888,270 -124,775 -4.14 202,525 -12.27 0.0053
2025-11-14 2025-09-30 13F BERKLEY W R COM 084423102 3,013,045 -68,110 -2.21 230,860 1.98 0.0295
2025-08-13 2025-06-30 13F BERKLEY W R COM 084423102 3,081,155 -156,208 -4.83 226,372 -1.74 0.0311
2025-05-13 2025-03-31 13F BERKLEY W R COM 084423102 3,237,363 -42,327 -1.29 230,371 20.03 0.0342
2025-02-14 2024-12-31 13F BERKLEY W R COM 084423102 3,279,690 560,370 20.61 191,927 24.41 0.0272
2024-11-13 2024-09-30 13F BERKLEY W R COM 084423102 2,719,320 773,139 39.73 154,267 0.87 0.0253
2024-08-14 2024-06-30 13F BERKLEY W R COM 084423102 1,946,181 612 0.03 152,931 -11.12 0.0258
2024-05-14 2024-03-31 13F BERKLEY W R COM 084423102 1,945,569 -95,873 -4.70 172,066 19.18 0.0297
2024-02-13 2023-12-31 13F BERKLEY W R COM 084423102 2,041,442 39,594 1.98 144,371 13.59 0.0261
2023-11-13 2023-09-30 13F BERKLEY W R COM 084423102 2,001,848 98,500 5.18 127,097 12.12 0.0246
2023-08-11 2023-06-30 13F BERKLEY W R COM 084423102 1,903,348 -96,492 -4.82 113,363 -8.95 0.0218
2023-05-15 2023-03-31 13F BERKLEY W R COM 084423102 1,999,840 22,545 1.14 124,510 -13.23 0.0247
2023-02-13 2022-12-31 13F BERKLEY W R COM 084423102 1,977,295 -11,922 -0.60 143,492 11.70 0.0301
2022-11-14 2022-09-30 13F BERKLEY W R COM 084423102 1,989,217 -40,820 -2.01 128,464 -7.29 0.0293
2022-08-12 2022-06-30 13F BERKLEY W R COM 084423102 2,030,037 -74,202 -3.53 138,570 -1.11 0.0297
2022-05-13 2022-03-31 13F BERKLEY W R COM 084423102 2,104,239 634,811 43.20 140,122 15.74 0.0247
2022-02-08 2021-12-31 13F BERKLEY W R COM 084423102 1,469,428 4,639 0.32 121,066 12.94 0.0198
2021-11-15 2021-09-30 13F BERKLEY W R COM 084423102 1,464,789 -17,479 -1.18 107,194 -2.84 0.0190
2021-08-13 2021-06-30 13F BERKLEY W R COM 084423102 1,482,268 -70,349 -4.53 110,326 -5.70 0.0194
2021-05-12 2021-03-31 13F BERKLEY W R COM 084423102 1,552,617 -150,591 -8.84 116,990 3.41 0.0218
2021-02-11 2020-12-31 13F BERKLEY W R COM 084423102 1,703,208 -65,844 -3.72 113,127 4.58 0.0220
2020-11-16 2020-09-30 13F BERKLEY W R COM 084423102 1,769,052 15,568 0.89 108,177 7.68 0.0237
2020-08-14 2020-06-30 13F BERKLEY W R COM 084423102 1,753,484 32,290 1.88 100,457 11.87 0.0238
2020-05-14 2020-03-31 13F BERKLEY W R COM 084423102 1,721,194 32,934 1.95 89,794 -23.03 0.0258
2020-02-14 2019-12-31 13F BERKLEY W R COM 084423102 1,688,260 4,962 0.29 116,658 -4.05 0.0261
2019-11-13 2019-09-30 13F BERKLEY W R COM 084423102 1,683,298 36,502 2.22 121,584 11.98 0.0291
2019-08-13 2019-06-30 13F BERKLEY W R COM 084423102 1,646,796 412,178 33.39 108,574 3.80 0.0258
2019-05-13 2019-03-31 13F BERKLEY W R COM 084423102 1,234,618 191,803 18.39 104,597 35.71 0.0258
2019-02-12 2018-12-31 13F W R BERKLEY COM 084423102 1,042,815 50,370 5.08 77,075 -2.84 0.0216
2018-11-14 2018-09-30 13F W R BERKLEY COM 084423102 992,445 -185,644 -15.76 79,326 -7.01 0.0194
2018-09-18 2018-06-30 13F/A-1 W R BERKLEY COM 084423102 1,178,089 -2,966 -0.25 85,305 -0.65 0.0217
2018-08-14 2018-06-30 13F W R BERKLEY COM 084423102 1,185,991 4,936 85,877
2018-05-09 2018-03-31 13F W R BERKLEY COM 084423102 1,181,055 3,279 0.28 85,863 1.75 0.0223
2018-02-14 2017-12-31 13F BERKLEY W R COM 084423102 1,177,776 -38,122 -3.14 84,389 3.99 0.0214
2017-11-13 2017-09-30 13F BERKLEY W R COM 084423102 1,215,898 -15,133 -1.23 81,149 -4.70 0.0211
2017-08-11 2017-06-30 13F BERKLEY W R COM 084423102 1,231,031 -7,825 -0.63 85,151 -2.68 0.0238
2017-05-12 2017-03-31 13F BERKLEY W R COM 084423102 1,238,856 86,839 7.54 87,500 14.20 0.0252
2017-02-13 2016-12-31 13F BERKLEY W R COM 084423102 1,152,017 268,902 30.45 76,620 50.21 0.0235
2016-11-09 2016-09-30 13F BERKLEY W R COM 084423102 883,115 20,107 2.33 51,009 -1.36 0.0159
2016-08-12 2016-06-30 13F BERKLEY W R COM 084423102 863,008 32,510 3.91 51,711 10.79 0.0168
2016-08-19 2016-03-31 13F/A-1 BERKLEY W R COM 084423102 830,498 23,741 2.94 46,674 5.67 0.0155
2016-05-13 2016-03-31 13F BERKLEY W R COM 084423102 830,498 46,674
2016-02-12 2015-12-31 13F BERKLEY W R COM 084423102 806,757 -104,268 -11.45 44,170 -10.83 0.0146
2015-11-12 2015-09-30 13F BERKLEY W R COM 084423102 911,025 -33,793 -3.58 49,532 0.95 0.0165
2015-08-13 2015-06-30 13F BERKLEY W R COM 084423102 944,818 -24,955 -2.57 49,065 0.17 0.0333
2015-05-14 2015-03-31 13F BERKLEY W R COM 084423102 969,773 -20,036 -2.02 48,982 -3.46 0.0147
2015-02-12 2014-12-31 13F BERKLEY W R COM 084423102 989,809 -43,518 -4.21 50,738 2.73 0.0153
2014-11-13 2014-09-30 13F BERKLEY W R COM 084423102 1,033,327 16,849 1.66 49,392 4.92 0.0155
2014-08-14 2014-06-30 13F BERKLEY W R COM 084423102 1,016,478 -4,435 -0.43 47,074 10.79 0.0147
2014-05-14 2014-03-31 13F BERKLEY W R COM 084423102 1,020,913 -112,578 -9.93 42,491 -13.61 0.0134
2014-02-21 2013-12-31 13F/A-1 BERKLEY W R COM 084423102 1,133,491 28,445 2.57 49,183 3.84 0.0158
2014-02-12 2013-12-31 13F BERKLEY W R COM 084423102 1,133,491 49,183
2013-11-13 2013-09-30 13F BERKLEY W R COM 084423102 1,105,046 -26,043 -2.30 47,363 2.48 0.0167
2013-08-09 2013-06-30 13F BERKLEY W R COM 084423102 1,131,089 1,131,089 46,216 0.0167
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.