WR 버클리 공사
MX ˙ BMV ˙ US0844231029
SecurityMX:WRB / W. R. Berkley Corporation
InstitutionOsterweis Capital Management Inc
Latest Disclosed Ownership6,331 shares
Latest Disclosed Value $ 419,619
Osterweis Capital Management Inc ownership in WRB / W. R. Berkley Corporation

On May 15, 2026 - Osterweis Capital Management Inc filed a 13F-HR form disclosing ownership of 6,331 shares of W. R. Berkley Corporation (MX:WRB) valued at $419,619 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 6,331 shares of W. R. Berkley Corporation. This represents a change in shares of 0.00% 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)
2026-05-15 2026-03-31 13F BERKLEY W R COM 084423102 6,331 0 0.00 420 -5.42 0.0164
2026-02-17 2025-12-31 13F BERKLEY W R COM 084423102 6,331 0 0.00 444 -8.66 0.0188
2025-11-14 2025-09-30 13F BERKLEY W R COM 084423102 6,331 0 0.00 485 4.30 0.0219
2025-08-14 2025-06-30 13F BERKLEY W R COM 084423102 6,331 1,041 19.68 465 23.67 0.0223
2025-06-05 2025-03-31 13F/A-1 BERKLEY W R COM 084423102 5,290 0 0.00 376 21.68 0.0186
2025-05-14 2025-03-31 13F BERKLEY W R COM 084423102 5,290 0 3,764 0.0149
2025-06-05 2024-12-31 13F/A-1 BERKLEY W R COM 084423102 5,290 0 0.00 310 3.00 0.0144
2025-02-13 2024-12-31 13F BERKLEY W R COM 084423102 5,290 0 0 0.0144
2024-11-14 2024-09-30 13F BERKLEY W R COM 084423102 5,290 1,763 49.99 300 8.30 0.0152
2024-08-14 2024-06-30 13F BERKLEY W R COM 084423102 3,527 0 0.00 277 -10.93 0.0143
2024-05-15 2024-03-31 13F BERKLEY W R COM 084423102 3,527 0 0.00 312 24.90 0.0183
2024-02-14 2023-12-31 13F BERKLEY W R COM 084423102 3,527 0 0.00 249 11.66 0.0158
2023-11-14 2023-09-30 13F BERKLEY W R COM 084423102 3,527 0 0.00 224 6.19 0.0164
2023-08-14 2023-06-30 13F BERKLEY W R COM 084423102 3,527 0 0.00 210 -4.11 0.0139
2023-05-15 2023-03-31 13F BERKLEY W R COM 084423102 3,527 -140 -3.82 220 -17.67 0.0149
2023-02-14 2022-12-31 13F BERKLEY W R COM 084423102 3,667 0 0.00 266 12.24 0.0193
2022-11-14 2022-09-30 13F BERKLEY W R COM 084423102 3,667 0 0.00 237 -5.20 0.0178
2022-08-15 2022-06-30 13F BERKLEY W R COM 084423102 3,667 -1 -0.03 250 2.46 0.0187
2022-05-16 2022-03-31 13F BERKLEY W R COM 084423102 3,668 1,223 50.02 244 21.39 0.0134
2022-02-14 2021-12-31 13F BERKLEY W R COM 084423102 2,445 2,445 201 0.0101
2021-05-14 2021-03-31 13F BERKLEY W R COM 084423102 0 -3,378 -100.00 0 -100.00
2021-02-12 2020-12-31 13F BERKLEY W R COM 084423102 3,378 0 0.00 224 8.21 0.0134
2020-11-13 2020-09-30 13F BERKLEY W R COM 084423102 3,378 3,378 207 0.0140
2020-05-15 2020-03-31 13F BERKLEY W R COM 084423102 0 -3,863 -100.00 0 -100.00
2020-02-14 2019-12-31 13F BERKLEY W R COM 084423102 3,863 0 0.00 267 -4.30 0.0185
2019-11-14 2019-09-30 13F BERKLEY W R COM 084423102 3,863 118 3.15 279 12.96 0.0203
2019-08-14 2019-06-30 13F BERKLEY W R COM 084423102 3,745 1,248 49.98 247 16.51 0.0174
2019-05-15 2019-03-31 13F BERKLEY W R COM 084423102 2,497 0 0.00 212 14.59 0.0133
2019-02-13 2018-12-31 13F W R BERKLEY COM 084423102 2,497 2,497 0.00 185 81.37 0.0142
2013-11-14 2013-09-30 13F BERKLEY W R COM 084423102 0 -2,497 -100.00 0 -100.00
2013-08-15 2013-06-30 13F BERKLEY W R COM 084423102 2,497 2,497 102 0.0038
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.