Fairfield, Bush & Co. reports 4.28% increase in ownership of WRB / W. R. Berkley Corporation

W. R. Berkley Corporation

US ˙ NYSE ˙ US0844231029

Security	WRB / W. R. Berkley Corporation
Institution	Fairfield, Bush & Co.
Latest Disclosed Ownership	15,993 shares
Latest Disclosed Value	$ 1,060,016

On May 12, 2026 - Fairfield, Bush & Co. filed a 13F-HR form disclosing ownership of 15,993 shares of W. R. Berkley Corporation (US:WRB) valued at $1,060,016 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 15,336 shares of W. R. Berkley Corporation. This represents a change in shares of 4.28% during the quarter. The current value of the position is $1,044,183 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-12	2026-03-31	13F	BERKLEY W R CORP COM	Stock	084423102	15,993	657	4.28	1,060	-1.40	0.5885
2026-02-13	2025-12-31	13F	BERKLEY W R CORP COM	Stock	084423102	15,336	-125	-0.81	1,075	-9.21	0.5673
2025-11-14	2025-09-30	13F	BERKLEY W R CORP COM	Stock	084423102	15,461	73	0.47	1,185	4.78	0.6082
2025-08-15	2025-06-30	13F	BERKLEY W R CORP COM	Stock	084423102	15,388	-1,286	-7.71	1,131	-4.72	0.6391
2025-05-13	2025-03-31	13F	BERKLEY W R CORP COM	Stock	084423102	16,674	-875	-4.99	1,187	15.59	0.7526
2025-02-13	2024-12-31	13F	BERKLEY W R CORP COM	Stock	084423102	17,549	-100	-0.57	1,027	2.50	0.6039
2024-11-12	2024-09-30	13F	BERKLEY W R CORP COM	Stock	084423102	17,649	5,424	44.37	1,001	4.27	0.5955
2024-08-15	2024-06-30	13F	BERKLEY W R CORP COM	Stock	084423102	12,225	600	5.16	961	-6.61	0.5756
2024-05-15	2024-03-31	13F	BERKLEY W R CORP COM	Stock	084423102	11,625	-2,250	-16.22	1,028	4.79	0.6095
2024-02-13	2023-12-31	13F	BERKLEY W R CORP COM	Stock	084423102	13,875	585	4.40	981	16.37	0.5754
2023-11-15	2023-09-30	13F	BERKLEY W R CORP COM	Stock	084423102	13,290	1,525	12.96	844	20.43	0.5513
2023-08-15	2023-06-30	13F	BERKLEY W R CORP COM	Stock	084423102	11,765	2,175	22.68	701	17.25	0.1929
2023-05-15	2023-03-31	13F	BERKLEY W R CORP COM	Stock	084423102	9,590	2,215	30.03	597	11.59	0.2103
2023-02-14	2022-12-31	13F	BERKLEY W R CORP COM	Stock	084423102	7,375	-1,050	-12.46	535	-1.65	0.3533
2022-11-07	2022-09-30	13F	BERKLEY W R CORP COM	Stock	084423102	8,425	-300	-3.44	544	-8.72	0.3841
2022-08-09	2022-06-30	13F	BERKLEY W R CORP COM	Stock	084423102	8,725	-300	-3.32	596	-0.83	0.3504
2022-05-12	2022-03-31	13F/A-1	BERKLEY W R CORP COM	Stock	084423102	9,025	-926	-9.31	601	-26.71	0.3014
2022-05-06	2022-03-31	13F	BERKLEY W R CORP COM	Stock	084423102	9,025	-926		601		0.2831
2022-05-12	2021-12-31	13F/A-1	BERKLEY W R CORP COM	Stock	084423102	9,951	-2,537	-20.32	820	-10.28	0.3942
2022-02-09	2021-12-31	13F	BERKLEY W R CORP COM	Stock	084423102	9,951	-2,537		820		0.3916
2021-11-08	2021-09-30	13F	BERKLEY W R CORP COM	Stock	084423102	12,488	400	3.31	914	1.56	0.2970
2021-08-02	2021-06-30	13F	W.R. Berkley	COM	084423102	12,088	-2,250	-15.69	900	-16.67	0.2446
2021-05-14	2021-03-31	13F	W.R. Berkley	COM	084423102	14,338	-1,465	-9.27	1,080	2.86	0.3083
2021-02-12	2020-12-31	13F	W.R. Berkley	COM	084423102	15,803	-2,000	-11.23	1,050	-3.58	0.3062
2020-11-18	2020-09-30	13F	W.R. Berkley	COM	084423102	17,803	1,900	11.95	1,089	19.54	0.3478
2020-08-13	2020-06-30	13F	W.R. Berkley	COM	084423102	15,903	-287	-1.77	911	7.81	0.3250
2020-05-13	2020-03-31	13F	W.R. Berkley	COM	084423102	16,190	-400	-2.41	845	-26.27	0.3512
2020-02-12	2019-12-31	13F	W.R. Berkley	COM	084423102	16,590	1,700	11.42	1,146	6.51	0.4218
2019-11-13	2019-09-30	13F	W.R. Berkley	COM	084423102	14,890	-1,501	-9.16	1,076	-0.46	0.3719
2019-08-13	2019-06-30	13F	W.R. Berkley	COM	084423102	16,391	4,128	33.66	1,081	4.04	0.3683
2019-05-15	2019-03-31	13F	W.R. Berkley	COM	084423102	12,263	-1,440	-10.51	1,039	2.57	0.3449
2019-02-11	2018-12-31	13F	W.R. Berkley	COM	084423102	13,703	-97	-0.70	1,013	-8.16	0.3485
2018-11-13	2018-09-30	13F	W.R. Berkley	COM	084423102	13,800	40	0.29	1,103	10.74	0.3096
2018-08-16	2018-06-30	13F	W.R. Berkley	COM	084423102	13,760	0	0.00	996	-0.40	0.2928
2018-05-09	2018-03-31	13F	W.R. Berkley	COM	084423102	13,760	-1,098	-7.39	1,000	-6.10	0.2904
2018-02-22	2017-12-31	13F	W.R. Berkley	COM	084423102	14,858	-35	-0.24	1,065	7.14	0.2935
2017-11-14	2017-09-30	13F	W.R. Berkley	COM	084423102	14,893	-58	-0.39	994	-3.87	0.3106
2017-08-15	2017-06-30	13F/A-1	W.R. Berkley	COM	084423102	14,951	1,670	12.57	1,034	10.23	0.3315
2017-08-15	2017-06-30	13F	W.R. Berkley	COM	084423102	14,951			1,034
2017-05-08	2017-03-31	13F	W.R. Berkley	COM	084423102	13,281	1,075	8.81	938	15.52	0.2925
2017-02-15	2016-12-31	13F	Berkley , W.R.	COM	084423102	12,206	0	0.00	812	15.18	0.2639
2016-11-15	2016-09-30	13F	Berkley , W.R.	COM	084423102	12,206	0	0.00	705	-3.56	0.2284
2016-08-15	2016-06-30	13F	Berkley , W.R.	COM	084423102	12,206	153	1.27	731	7.98	0.2536
2016-05-13	2016-03-31	13F	W.R. Berkley	COM	084423102	12,053	-120	-0.99	677	1.65	0.2420
2016-02-12	2015-12-31	13F	W.R. Berkley	COM	084423102	12,173	-400	-3.18	666	-2.63	0.2330
2015-11-13	2015-09-30	13F	W.R. Berkley	COM	084423102	12,573	-801	-5.99	684	-1.58	0.3005
2015-08-14	2015-06-30	13F	W.R. Berkley	COM	084423102	13,374	-650	-4.63	695	-1.84	0.2090
2015-05-15	2015-03-31	13F	W.R. Berkley	COM	084423102	14,024	-240	-1.68	708	-3.15	0.2065
2015-02-13	2014-12-31	13F	W.R. Berkley	COM	084423102	14,264	-1,425	-9.08	731	-2.53	0.2095
2014-11-13	2014-09-30	13F	W.R. Berkley	COM	084423102	15,689	0	0.00	750	3.16	0.2154
2014-08-15	2014-06-30	13F	W.R. Berkley	COM	084423102	15,689	100	0.64	727	12.02	0.2134
2014-05-05	2014-03-31	13F/A-1	W.R. Berkley	COM	084423102	15,589	-40	-0.26	649	-4.28	0.3057
2014-05-05	2014-03-31	13F	W.R. Berkley	COM	084423102	649			649
2014-02-14	2013-12-31	13F	W.R. Berkley	COM	084423102	15,629	0	0.00	678	1.35	0.3030
2013-11-13	2013-09-30	13F/A-1	W.R. Berkley	COM	084423102	15,629	-3,765	-19.41	669	-15.53	0.2023
2013-11-13	2013-09-30	13F	Xilinx	COM	084423102	16,670			781
2013-08-15	2013-06-30	13F/A-1	W.R. Berkley	COM	084423102	19,394	19,394		792		0.4041
2013-08-15	2013-06-30	13F	W.R. Berkley	COM	084423102	19,394			792,439

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.