BERKLEY W R CORP

Insurer

CIK

11544

Location

Greenwich, CT

Portfolio Value

Mid $2,160,605,853

Diversification

Diversified

Filing Date

Global Rank

#1,520 / 8,818 ▲ 9

Top Industry

Shell Companies 48.9%

Period ended 4 months ago

Filed Aug 24, 2026 · 2mo

26 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type

Insurer

SEC filer profile, Oct 17, 2026

SIC code

6331

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, never from the firm's own description.

Style

Diversified active

Top 10 weight 42.4%, 32.2 effective positions, active share 93.3% against every 13F filer's combined book; it meets none of the index-like, systematic-like or concentrated tests

Turnover

Medium turnover

92.1% over the last four quarters (30% to under 100%)

Horizon

Horizon unknown

The value-weighted holding period is at least 8.7 quarters, but 0.3% of the book was already held when coverage starts

Closest benchmark: every 13F filer's combined book, active share 93.3%; sector active share 71.6% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

View clone backtest

Portfolio Concentration

317 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

11.6%

−2.4 pts

Top 5

31.6%

−2.3 pts

Top 10

43.9%

+1.0 pts

HHI

304

Diversified−56

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Financial Services	51.7%	$1,117,764,746	294
Energy	29.0%	$625,657,755	5
Technology	12.9%	$277,991,193	4
Consumer Cyclical	3.1%	$66,512,564	3
Healthcare	1.1%	$23,256,747	2
Unclassified	0.7%	$15,546,554	3
Real Estate	0.6%	$13,123,615	1
Utilities	0.5%	$11,543,919	2
Communication Services	0.3%	$6,675,578	1
Industrials	0.1%	$2,533,182	2

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
FACT	FACT II Acquisition Corp.	+827,695	1,153,140	$12,257,878
CRAC	Crown Reserve Acquisition Corp. I	+765,710	1,217,433	$12,308,247
QSEA	Quartzsea Acquisition Corp	+688,641	1,094,190	$11,510,878
—		+638,649	3,265,181	$37,288,367
NPAC	New Providence Acquisition Corp. III	+534,113	1,179,542	$12,244,825
PAA	Plains All American Pipeline LP	+500,000	3,184,307	$70,882,673
GTERA	Globa Terra Acquisition Corp	+498,843	1,561,028	$16,094,198
JACS	Jackson Acquisition Co II	+497,474	927,836	$9,872,175
DRDB	Roman DBDR Acquisition Corp. II	+475,757	2,276,587	$23,983,844
VLOS	Velos Acquisition I Corp.	+466,050	1,429,725	$15,483,921
SZZL	Sizzle Acquisition Corp. II	+446,680	843,448	$8,738,121
—		+442,054	2,211,677	$22,846,623
SBXDF	SilverBox Corp IV	+415,554	1,930,127	$20,864,672
LCCC	Lakeshore Acquisition III Corp.	+376,629	687,425	$7,156,094
QUMS	Quantumsphere Acquisition Corp	+372,862	881,402	$9,007,928
ONEN	ONE Nuclear Energy Inc.	+372,814	1,101,473	$11,510,392
SDHI	Siddhi Acquisition Corp (Cayman Islands)	+353,368	826,986	$8,617,194
TAVI	Tavia Acquisition Corp.	+331,470	548,331	$5,853,433
AEXA	American Exceptionalism Acquisition Corp. A	+326,620	747,779	$8,838,747
EGHA	EGH Acquisition Corp.	+302,332	409,369	$4,212,407
TACH	Titan Acquisition Corp.	+282,584	778,984	$8,109,223
PCAP	ProCap Acquisition Corp	+272,445	700,182	$7,197,870
CEPO	Cantor Equity Partners I, Inc.	+222,210	1,444,647	$12,756,233
POLE	Andretti Acquisition Corp. II	+220,738	683,233	$7,344,754
SSAC	SPACSphere Acquisition Corp.	+195,633	768,983	$7,674,450
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
—		−1,706,077	104,360	$1,136,480
CUB	Lionheart Holdings	−718,197	198,776	$2,140,817
PGAC	PANTAGES CAPITAL ACQUISITION Corp	−625,795	248,616	$2,642,788
TACO	Berto Acquisition Corp.	−596,599	1,225,999	$12,860,729
GIXXR	GigCapital9 Corp.	−482,431	400,000	$114,020
GPAT	GP-Act III Acquisition Corp.	−349,759	497,064	$5,403,085
RFAMR	RF Acquisition Corp III	−281,057	52,000	$6,500
BXBL	BOXABL Inc.	−254,784	61,244	$618,564
MACI	Melar Acquisition Corp. I	−203,047	795,916	$8,659,566
—		−179,255	49,282	$508,590
PTORW	Praetorian Acquisition Corp.	−155,174	110,056	$41,821
HVIIR	ONE Nuclear Energy Inc.	−153,600	94,950	$33,527
KTWOR	K2 Capital Acquisition Corp	−141,070	57,890	$12,484
EMISR	Emmis Acquisition Corp.	−108,216	89,612	$12,541
ZKPW	Lafayette Digital Acquisition Corp. I	−103,522	58,092	$18,009
XSLLW	Xsolla SPAC 1	−99,480	360,615	$80,994
FGIIW	FG Imperii Acquisition Corp.	−96,050	400,000	$117,360
LWACW	LightWave Acquisition Corp.	−85,578	10,029	$2,962
RANG	Range Capital Acquisition Corp.	−79,788	497,293	$5,318,548
TONT	Graf Global Corp.	−79,182	223,937	$2,429,716
LAFAR	LaFayette Acquisition Corp.	−75,263	70,423	$6,778
BSAAR	BEST SPAC I Acquisition Corp.	−71,752	91,786	$15,200
KFIIR	K&F Growth Acquisition Corp. II	−64,346	332,574	$42,752
SZZLR	Sizzle Acquisition Corp. II	−60,067	30,197	$5,765
SPKLF	Spark I Acquisition Corp	−59,368	31,058	$389,778
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
MSFT	Microsoft Corp	149,400	$55,729,188
NVDA	Nvidia Corp	124,800	$24,971,232
TSM	Taiwan Semiconductor Manufacturing Co Ltd	49,700	$23,735,229
PFE	Pfizer Inc	965,537	$23,250,130
TSLA	Tesla, Inc.	50,000	$21,030,000
AMZN	Amazon Com Inc	50,000	$11,917,000
BREZ	Breeze Acquisition Corp. II	557,070	$5,520,563
SUMA	SUMA Acquisition Corp	546,810	$5,407,950
FMAC	Future Money Acquisition Corp	540,732	$5,396,505
QLEP	Quantum Leap Acquisition Corp	496,600	$4,931,238
CTAA	Clearthink 1 Acquisition Corp.	497,000	$4,925,270
OHAC	Oceanhawk Acquisition Corp.	472,530	$4,678,047
SAGU	Shreya Acquisition Group	447,352	$4,424,311
ATLQ	JAB Acquisition Corp I	397,720	$3,989,132
PAAC	Proem Acquisition Corp. I	397,720	$3,953,336
TRGS	TRG Latin America Acquisitions Corp.	397,600	$3,932,264
GSRV	GSR V Acquisition Corp.	387,193	$3,883,546
ILLU	Illumination Acquisition Corp. I	323,049	$3,198,185
PONO	Pono Capital Four, Inc.	298,260	$2,970,669
MTNE	CH4 Natural Solutions Corp	297,960	$2,934,906
ARCL	ARC Group Acquisition I Corp.	285,833	$2,824,030
SHOT	RMG ML Sports Holdings	273,433	$2,731,596
IDACU	Iron Dome Acquisition I Corp.	256,800	$2,593,680
GHXI	Gores Holdings XI, Inc.	248,552	$2,520,317
WLII	Willow Lane Acquisition Corp. II	245,700	$2,513,511
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
—		2,321,633	$26,721,996
—		2,229,948	$22,990,764
—		1,877,833	$19,773,769
HDRN	Hadron Energy, Inc.	1,735,682	$18,485,013
—		1,466,215	$16,113,703
—		1,303,583	$13,922,266
ALF	Centurion Acquisition Corp.	1,157,544	$12,455,173
SIMA	SIM Acquisition Corp. I	912,286	$9,779,705
—		661,663	$7,066,561
TMS	Teamshares Inc	647,661	$6,735,674
SUMAU	SUMA Acquisition Corp	546,810	$5,479,036
FMACU	Future Money Acquisition Corp	540,732	$5,401,912
CTAAU	Clearthink 1 Acquisition Corp.	497,000	$4,970,000
BACC	Blue Acquisition Corp	441,650	$4,509,246
BSAA	BEST SPAC I Acquisition Corp.	437,808	$4,491,910
FAC	Factorial Energy Inc.	393,552	$4,035,875
FVN	Future Vision II Acquisition Corp.	371,104	$3,987,512
PAACU	Proem Acquisition Corp. I	397,720	$3,981,177
TRGSU	TRG Latin America Acquisitions Corp.	397,600	$3,956,120
ILLUU	Illumination Acquisition Corp. I	323,050	$3,204,656
ENHA	Enhanced Group Inc.	306,725	$3,119,393
PONOU	Pono Capital Four, Inc.	298,260	$2,976,634
WLIIU	Willow Lane Acquisition Corp. II	245,702	$2,481,590
BCAR	D. Boral ARC Acquisition I Corp.	226,854	$2,295,762
ATII	Archimedes Tech SPAC Partners II Co.	208,065	$2,165,956
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

317 tracked positions · $2,160,605,853 total · filing declares 2 positions · $78,434,132 · as of Jun 30, 2026

All sectors Communication Services Consumer Cyclical Energy Financial Services Healthcare Industrials Real Estate Technology Utilities

Showing 1–50 of 317 positions by value · page 1 of 7

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	Held (qtrs)	Est. cost/share	% of Portfolio
EPD	Enterprise Products Partners L.P. Energy	Held	6,825,000	0	$250,887,000	−2.9%	20	$26.23	11.61%
ET	Energy Transfer LP Energy	Held	8,250,000	0	$157,740,000	−0.9%	20	unpriced	7.30%
MSFT	Microsoft Corp PUT + SHARES Technology	NEW	298,800	NEW	$111,458,376	NEW	1	$404.60	5.16%
KMI	Kinder Morgan, Inc. Energy	Held	2,837,206	0	$90,705,475	−4.7%	23	$14.24	4.20%
PAA	Plains All American Pipeline LP Energy	Added	3,184,307	+500,000	$70,882,673	+18.3%	4	$18.36	3.28%
ON	On Semiconductor Corp Technology	Held	731,118	0	$69,119,895	+52.7%	17	$58.46	3.20%
WES	Western Midstream Partners, LP Energy	Held	1,266,970	0	$55,442,607	+6.3%	4	$39.73	2.57%
NVDA	Nvidia Corp PUT + SHARES Technology	NEW	249,600	NEW	$49,942,464	NEW	1	$205.61	2.31%
TSM	Taiwan Semiconductor Manufacturing Co Ltd PUT + SHARES Technology	NEW	99,400	NEW	$47,470,458	NEW	1	$405.79	2.20%
PGR	Progressive Corp Financial Services	Held	207,589	0	$45,347,817	+10.2%	3	$216.46	2.10%
TSLA	Tesla, Inc. PUT + SHARES Consumer Cyclical	NEW	100,000	NEW	$42,060,000	NEW	1	$397.72	1.95%
		Added	3,265,181	+638,649	$37,288,367	+25.7%	8	$10.76	1.73%
DRDB	Roman DBDR Acquisition Corp. II Financial Services	Added	2,276,587	+475,757	$23,983,844	+27.2%	6	$10.42	1.11%
AMZN	Amazon Com Inc PUT + SHARES Consumer Cyclical	NEW	100,000	NEW	$23,834,000	NEW	1	$251.01	1.10%
PFE	Pfizer Inc Healthcare	NEW	965,537	NEW	$23,250,130	NEW	1	$26.16	1.08%
GBLI	Global Indemnity Group, LLC Financial Services	Held	919,661	0	$23,019,114	−8.1%	18	$26.14	1.07%
		Added	2,211,677	+442,054	$22,846,623	+26.4%	5	unpriced	1.06%
SBXDF	SilverBox Corp IV Financial Services	Added	1,930,127	+415,554	$20,864,672	+28.7%	7	$10.59	0.97%
EVAC	EQV Ventures Acquisition Corp. II Financial Services	Added	1,880,883	+29,408	$19,147,388	+2.5%	4	$9.94	0.89%
LPAA	Launch One Acquisition Corp. Financial Services	Added	1,675,043	+187,918	$18,157,466	+14.0%	8	unpriced	0.84%
KCHV	Kochav Defense Acquisition Corp. Financial Services	Held	1,690,352	0	$17,528,950	+1.2%	4	$10.04	0.81%
MCGA	Yorkville Acquisition Corp. Financial Services	Held	1,645,570	0	$16,801,269	+1.0%	4	$10.20	0.78%
GTERA	Globa Terra Acquisition Corp Financial Services	Added	1,561,028	+498,843	$16,094,198	+48.4%	4	$10.09	0.74%
VLOS	Velos Acquisition I Corp. Financial Services	Added	1,429,725	+466,050	$15,483,921	+49.6%	8	unpriced	0.72%
JOE	ST JOE Co Real Estate	Held	209,542	0	$13,123,615	−0.3%	7	$51.74	0.61%
GIW	GigCapital8 Corp. Financial Services	Held	1,289,470	0	$12,983,673	+1.0%	3	$9.91	0.60%
TACO	Berto Acquisition Corp. Financial Services	Reduced	1,225,999	-596,599	$12,860,729	−31.2%	5	unpriced	0.60%
XRPN	Armada Acquisition Corp. II Financial Services	Held	1,233,735	0	$12,855,518	+1.1%	5	unpriced	0.59%
CEPO	Cantor Equity Partners I, Inc. Financial Services	Added	1,444,647	+222,210	$12,756,233	−0.6%	6	$10.44	0.59%
CRAC	Crown Reserve Acquisition Corp. I Financial Services	Added	1,217,433	+765,710	$12,308,247	+172.2%	3	unpriced	0.57%
FACT	FACT II Acquisition Corp.	Added	1,153,140	+827,695	$12,257,878	+258.7%	7	unpriced	0.57%
NPAC	New Providence Acquisition Corp. III Financial Services	Added	1,179,542	+534,113	$12,244,825	+84.9%	5	unpriced	0.57%
KFII	K&F Growth Acquisition Corp. II Financial Services	Added	1,124,156	+49,301	$11,859,845	+5.8%	6	unpriced	0.55%
QSEA	Quartzsea Acquisition Corp Financial Services	Added	1,094,190	+688,641	$11,510,878	+173.7%	5	$10.32	0.53%
ONEN	ONE Nuclear Energy Inc. Utilities	Added	1,101,473	+372,814	$11,510,392	+52.6%	6	$10.14	0.53%
COPL	Copley Acquisition Corp Financial Services	Added	1,084,469	+56,845	$11,311,011	+6.7%	5	unpriced	0.52%
		Added	1,060,952	+79,856	$11,150,605	+9.3%	6	unpriced	0.52%
JACS	Jackson Acquisition Co II Financial Services	Added	927,836	+497,474	$9,872,175	+116.6%	6	$10.39	0.46%
FGII	FG Imperii Acquisition Corp. Financial Services	Held	992,100	0	$9,851,553	+0.3%	2	unpriced	0.46%
CHAR	Charlton Aria Acquisition Corp Financial Services	Held	878,975	0	$9,492,930	+2.1%	7	unpriced	0.44%
XSLL	Xsolla SPAC 1 Financial Services	Held	920,190	0	$9,109,881	+0.7%	2	unpriced	0.42%
LPBB	Launch Two Acquisition Corp. Financial Services	Added	847,934	+31,217	$9,089,852	+4.8%	7	unpriced	0.42%
QUMS	Quantumsphere Acquisition Corp Financial Services	Added	881,402	+372,862	$9,007,928	+75.0%	3	$10.08	0.42%
RFAI	RF Acquisition Corp II Financial Services	Added	814,851	+48,426	$8,987,806	+7.6%	8	$10.67	0.42%
SOUL	Soulpower Acquisition Corp. Financial Services	Held	866,764	0	$8,971,007	+1.0%	5	unpriced	0.42%
AEXA	American Exceptionalism Acquisition Corp. A Financial Services	Added	747,779	+326,620	$8,838,747	+93.8%	4	unpriced	0.41%
GIX	GigCapital9 Corp. Financial Services	Held	882,431	0	$8,762,539	+1.0%	2	unpriced	0.41%
SZZL	Sizzle Acquisition Corp. II Financial Services	Added	843,448	+446,680	$8,738,121	+114.2%	5	$10.16	0.40%
MACI	Melar Acquisition Corp. I Financial Services	Reduced	795,916	-203,047	$8,659,566	−19.5%	8	$10.40	0.40%
SDHI	Siddhi Acquisition Corp (Cayman Islands) Financial Services	Added	826,986	+353,368	$8,617,194	+76.0%	5	unpriced	0.40%

Showing the top 50 of 317 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.