W. R. Berkley Corporation
MX ˙ BMV ˙ US0844231029
SecurityMX:WRB / W. R. Berkley Corporation
InstitutionAsset Management Group, Inc.
Latest Disclosed Ownership54,992 shares
Latest Disclosed Value $ 3,644,892
Asset Management Group, Inc. reports 1.39% decrease in ownership of WRB / W. R. Berkley Corporation

On May 15, 2026 - Asset Management Group, Inc. filed a 13F-HR form disclosing ownership of 54,992 shares of W. R. Berkley Corporation (MX:WRB) valued at $3,644,892 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 55,767 shares of W. R. Berkley Corporation. This represents a change in shares of -1.39% 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.

Upgrade to unlock premium data and export to Excel .

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 54,992 -775 -1.39 3,645 -6.80 0.5873
2026-02-17 2025-12-31 13F BERKLEY W R COM 084423102 55,767 -871 -1.54 3,910 -9.89 0.6325
2025-11-14 2025-09-30 13F BERKLEY W R COM 084423102 56,638 -664 -1.16 4,340 3.09 0.7099
2025-08-12 2025-06-30 13F BERKLEY W R COM 084423102 57,302 -177 -0.31 4,210 2.91 0.7339
2025-05-14 2025-03-31 13F BERKLEY W R COM 084423102 57,479 -7,089 -10.98 4,090 8.26 0.7558
2025-02-14 2024-12-31 13F BERKLEY W R COM 084423102 64,568 86 0.13 3,779 3.28 0.6718
2024-11-12 2024-09-30 13F BERKLEY W R COM 084423102 64,482 19,499 43.35 3,658 3.51 0.6406
2024-08-13 2024-06-30 13F BERKLEY W R COM 084423102 44,983 -61 -0.14 3,535 -11.27 0.6584
2024-05-15 2024-03-31 13F BERKLEY W R COM 084423102 45,044 -908 -1.98 3,984 22.59 0.7478
2024-02-14 2023-12-31 13F BERKLEY W R COM 084423102 45,952 -720 -1.54 3,250 9.65 0.6511
2023-11-14 2023-09-30 13F BERKLEY W R COM 084423102 46,672 84 0.18 2,963 6.81 0.6518
2023-08-14 2023-06-30 13F BERKLEY W R COM 084423102 46,588 -433 -0.92 2,775 -5.23 0.5890
2023-05-15 2023-03-31 13F BERKLEY W R COM 084423102 47,021 -238 -0.50 2,928 -14.64 0.6528
2023-02-14 2022-12-31 13F BERKLEY W R COM 084423102 47,259 -418 -0.88 3,430 11.37 0.8058
2022-11-14 2022-09-30 13F BERKLEY W R COM 084423102 47,677 -833 -1.72 3,079 -7.01 0.7690
2022-08-15 2022-06-30 13F BERKLEY W R COM 084423102 48,510 0 0.00 3,311 2.51 0.7944
2022-05-16 2022-03-31 13F BERKLEY W R COM 084423102 48,510 15,601 47.41 3,230 19.14 0.6758
2022-02-14 2021-12-31 13F BERKLEY W R COM 084423102 32,909 -844 -2.50 2,711 9.76 0.5329
2021-11-15 2021-09-30 13F BERKLEY W R COM 084423102 33,753 -4,762 -12.36 2,470 -13.85 0.5070
2021-08-16 2021-06-30 13F Berkley W R SK 084423102 38,515 -2,697 -6.54 2,867 -7.67 0.5930
2021-05-17 2021-03-31 13F Berkley W R SK 084423102 41,212 -664 -1.59 3,105 11.65 0.6722
2021-02-16 2020-12-31 13F Berkley W R SK 084423102 41,876 69 0.17 2,781 8.80 0.6762
2020-11-16 2020-09-30 13F Berkley W R SK 084423102 41,807 -795 -1.87 2,556 4.71 0.7470
2020-08-14 2020-06-30 13F Berkley W R SK 084423102 42,602 0 0.00 2,441 9.81 0.7713
2020-05-15 2020-03-31 13F Berkley W R SK 084423102 42,602 -2,762 -6.09 2,223 -29.09 0.8385
2020-02-14 2019-12-31 13F Berkley W R SK 084423102 45,364 129 0.29 3,135 -4.04 0.9485
2019-11-14 2019-09-30 13F Berkley W R SK 084423102 45,235 -1,195 -2.57 3,267 6.73 1.1202
2019-08-14 2019-06-30 13F Berkley W R SK 084423102 46,430 12,532 36.97 3,061 6.58 1.0870
2019-05-15 2019-03-31 13F Berkley W R SK 084423102 33,898 0 0.00 2,872 14.65 1.0417
2019-02-14 2018-12-31 13F Berkley W R SK 084423102 33,898 -526 -1.53 2,505 -8.98 1.0287
2018-11-13 2018-09-30 13F Berkley W R SK 084423102 34,424 -193 -0.56 2,752 9.77 0.9317
2018-08-14 2018-06-30 13F Berkley W R SK 084423102 34,617 -6,795 -16.41 2,507 -16.74 0.8754
2018-05-15 2018-03-31 13F Berkley W R SK 084423102 41,412 0 0.00 3,011 1.48 1.0786
2018-02-14 2017-12-31 13F Berkley W R SK 084423102 41,412 -1,342 -3.14 2,967 4.00 1.0686
2017-11-14 2017-09-30 13F Berkley W R SK 084423102 42,754 -1,107 -2.52 2,853 -5.97 1.0697
2017-08-14 2017-06-30 13F Berkley W R SK 084423102 43,861 -3,535 -7.46 3,034 -9.38 1.1729
2017-05-15 2017-03-31 13F Berkley W R SK 084423102 47,396 -1,128 -2.32 3,348 3.75 1.3250
2017-02-14 2016-12-31 13F Berkley W R SK 084423102 48,524 -2,188 -4.31 3,227 10.17 1.3249
2016-11-14 2016-09-30 13F Berkley W R SK 084423102 50,712 -289 -0.57 2,929 -4.16 1.2174
2016-08-15 2016-06-30 13F Berkley W R SK 084423102 51,001 -1,429 -2.73 3,056 3.70 1.3254
2016-05-16 2016-03-31 13F Berkley W R SK 084423102 52,430 0 0.00 2,947 2.65 1.3069
2016-02-16 2015-12-31 13F Berkley W R SK 084423102 52,430 -2,335 -4.26 2,871 -3.59 1.3030
2015-11-16 2015-09-30 13F Berkley W R SK 084423102 54,765 -2,058 -3.62 2,978 0.91 1.3953
2015-08-14 2015-06-30 13F Berkley W R SK 084423102 56,823 84 0.15 2,951 2.97 1.3305
2015-05-15 2015-03-31 13F Berkley W R SK 084423102 56,739 8,607 17.88 2,866 16.17 1.3290
2015-02-17 2014-12-31 13F Berkley W R SK 084423102 48,132 169 0.35 2,467 7.59 1.2421
2014-11-14 2014-09-30 13F Berkley W R SK 084423102 47,963 90 0.19 2,293 3.43 1.2243
2014-08-14 2014-06-30 13F Berkley W R SK 084423102 47,873 7,162 17.59 2,217 30.87 1.1968
2014-05-15 2014-03-31 13F Berkley W R SK 084423102 40,711 19,213 89.37 1,694 81.56 0.9733
2014-02-14 2013-12-31 13F Berkley W R SK 084423102 21,498 101 0.47 933 1.74 0.5683
2013-11-14 2013-09-30 13F Berkley W R SK 084423102 21,397 51 0.24 917 5.16 0.5972
2013-08-14 2013-06-30 13F Berkley W R SK 084423102 21,346 21,346 872 0.5992
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.