W. R. Berkley Corporation
US ˙ NYSE ˙ US0844231029

SecurityWRB / W. R. Berkley Corporation
InstitutionAmalgamated Bank
Latest Disclosed Ownership58,330 shares
Latest Disclosed Value $ 3,866
Amalgamated Bank reports 5.23% increase in ownership of WRB / W. R. Berkley Corporation

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 58,330 shares of W. R. Berkley Corporation (US:WRB) valued at $3,866,112 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 55,432 shares of W. R. Berkley Corporation. This represents a change in shares of 5.23% during the quarter. The current value of the position is $3,808,366 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)
2026-05-08 2026-03-31 13F WR BERKLEY COM 084423102 58,330 2,898 5.23 4 0.00 0.0296
2026-02-05 2025-12-31 13F WR BERKLEY COM 084423102 55,432 -2,791 -4.79 4 -25.00 0.0281
2025-10-29 2025-09-30 13F WR BERKLEY COM 084423102 58,223 -1,502 -2.51 4 0.00 0.0319
2025-08-04 2025-06-30 13F WR BERKLEY COM 084423102 59,725 463 0.78 4 0.00 0.0339
2025-04-25 2025-03-31 13F WR BERKLEY COM 084423102 59,262 17 0.03 4 33.33 0.0361
2025-02-04 2024-12-31 13F WR BERKLEY COM 084423102 59,245 469 0.80 3 0.00 0.0285
2024-10-30 2024-09-30 13F WR BERKLEY COM 084423102 58,776 7,811 15.33 3 -25.00 0.0275
2024-08-12 2024-06-30 13F WR BERKLEY COM 084423102 50,965 -2,039 -3.85 4 0.00 0.0341
2024-04-23 2024-03-31 13F WR BERKLEY COM 084423102 53,004 -123 -0.23 5 33.33 0.0401
2024-02-06 2023-12-31 13F WR BERKLEY COM 084423102 53,127 527 1.00 4 0.00 0.0300
2023-11-08 2023-09-30 13F WR BERKLEY COM 084423102 52,600 93 0.18 3 0.00 0.0284
2023-08-11 2023-06-30 13F WR BERKLEY COM 084423102 52,507 -2,322 -4.23 3 0.00 0.0253
2023-05-02 2023-03-31 13F WR BERKLEY COM 084423102 54,829 348 0.64 3 0.00 0.0291
2023-02-10 2022-12-31 13F WR BERKLEY COM 084423102 54,481 373 0.69 4 -99.91 0.0353
2022-11-09 2022-09-30 13F WR BERKLEY COM 084423102 54,108 -10,823 -16.67 3,494 -21.16 0.0337
2022-08-15 2022-06-30 13F WR BERKLEY COM 084423102 64,931 -3,519 -5.14 4,432 -2.76 0.0413
2022-08-25 2022-03-31 13F/A-1 WR BERKLEY COM 084423102 68,450 20,368 42.36 4,558 15.07 0.0354
2022-06-30 2022-03-31 13F WR BERKLEY COM 084423102 68,450 20,368 4,558 0.0362
2022-02-15 2021-12-31 13F/A-1 WR BERKLEY COM 084423102 48,082 -2,167 -4.31 3,961 7.72 0.0292
2022-02-15 2021-12-31 13F WR BERKLEY COM 084423102 48,082 -2,167 3,961 0.0292
2021-10-29 2021-09-30 13F WR BERKLEY COM 084423102 50,249 -1,361 -2.64 3,677 -4.27 0.0310
2021-08-16 2021-06-30 13F WR BERKLEY COM 084423102 51,610 33,721 188.50 3,841 184.94 0.0308
2021-05-13 2021-03-31 13F WR BERKLEY COM 084423102 17,889 -1,144 -6.01 1,348 6.65 0.0505
2021-02-12 2020-12-31 13F WR BERKLEY COM 084423102 19,033 10 0.05 1,264 8.68 0.0479
2020-10-30 2020-09-30 13F WR BERKLEY COM 084423102 19,023 -124 -0.65 1,163 6.02 0.0506
2020-08-10 2020-06-30 13F WR BERKLEY COM 084423102 19,147 -14,052 -42.33 1,097 -36.66 0.0508
2020-05-13 2020-03-31 13F WR BERKLEY COM 084423102 33,199 -792 -2.33 1,732 -26.27 0.0423
2020-02-13 2019-12-31 13F WR BERKLEY COM 084423102 33,991 4,352 14.68 2,349 9.72 0.0432
2019-11-13 2019-09-30 13F WR BERKLEY COM 084423102 29,639 -511 -1.69 2,141 7.70 0.0450
2019-08-14 2019-06-30 13F WR BERKLEY COM 084423102 30,150 11,078 58.09 1,988 23.02 0.0464
2019-05-15 2019-03-31 13F WR BERKLEY COM 084423102 19,072 395 2.11 1,616 17.10 0.0392
2019-02-15 2018-12-31 13F WR BERKLEY COM 084423102 18,677 -280 -1.48 1,380 -8.91 0.0391
2018-11-14 2018-09-30 13F WR BERKLEY COM 084423102 18,957 -55 -0.29 1,515 10.02 0.0375
2018-07-18 2018-06-30 13F WR BERKLEY COM 084423102 19,012 -56 -0.29 1,377 -0.65 0.0337
2018-05-22 2018-03-31 13F WR BERKLEY COM 084423102 19,068 -192 -1.00 1,386 0.43 0.0368
2018-02-13 2017-12-31 13F WR BERKLEY COM 084423102 19,260 1,100 6.06 1,380 13.86 0.0373
2017-11-09 2017-09-30 13F WR BERKLEY COM 084423102 18,160 -568 -3.03 1,212 -6.41 0.0377
2017-08-10 2017-06-30 13F WR BERKLEY COM 084423102 18,728 3,520 23.15 1,295 20.58 0.0424
2017-05-12 2017-03-31 13F WR BERKLEY COM 084423102 15,208 448 3.04 1,074 9.37 0.0535
2017-02-14 2016-12-31 13F WR BERKLEY COM 084423102 14,760 1,719 13.18 982 30.41 0.0444
2016-11-15 2016-09-30 13F/A-1 WR BERKLEY COM 084423102 13,041 -13 -0.10 753 -1.05 0.0437
2016-08-16 2016-06-30 13F WR BERKLEY COM 084423102 13,054 1,291 10.98 761 15.13 0.0440
2016-05-11 2016-03-31 13F WR BERKLEY COM 084423102 11,763 1,010 9.39 661 12.22 0.0644
2016-02-10 2015-12-31 13F WR BERKLEY COM 084423102 10,753 -706 -6.16 589 -5.46 0.0727
2015-11-04 2015-09-30 13F WR BERKLEY COM 084423102 11,459 101 0.89 623 5.59 0.0654
2015-07-10 2015-06-30 13F WR BERKLEY COM 084423102 11,358 11,358 590 0.0579
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.