W.R. Berkley Corp’s SilverBox Corp IV SBXD Stock Holding History

W.R. Berkley Corp’s Portfolio SBXD Stock Details SBXD Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$16.2M	Buy	1,514,573 +302,899	+25%	+$3.23M	0.87%	21
2025 Q4	$12.8M	Buy	1,211,674 +1,040,483	+608%	+$11M	0.6%	31
2025 Q3	$1.79M	Buy	171,191 +110,952	+184%	+$1.17M	0.1%	148
2025 Q2	$660K	Buy	60,239 +521	+0.9%	+$5.46K	0.03%	174
2025 Q1	$608K	Hold	59,718	–	–	0.04%	133
2024 Q4	$603K	Buy	+59,718	New	+$599K	0.02%	136

Other funds holding SBXD

Linden Advisors New York $17.9B AUM 1.72% 1-Year Est. Return

MSU

Mizuho Securities USA New York $6.2B AUM 35.46% 1-Year Est. Return

PAMP

Polar Asset Management Partners Toronto, Ontario, Canada $5.01B AUM 35.27% 1-Year Est. Return

AQR Arbitrage Greenwich, Connecticut $6.09B AUM 27.01% 1-Year Est. Return

WAM

Wolverine Asset Management Chicago, Illinois $10.4B AUM 4.78% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

MMCAP International Grand Cayman, Cayman Islands $1.16B AUM 77.9% 1-Year Est. Return

Crossingbridge Advisors Pleasantville, New York $553M AUM 1.29% 1-Year Est. Return

PMAM

Picton Mahoney Asset Management Toronto, Ontario, Canada $13.5B AUM 50.48% 1-Year Est. Return

RiverPark Advisors New York $219M AUM 14.91% 1-Year Est. Return

W.R. Berkley Corp's SBXD Position: Q1 2026 in Review

W.R. Berkley Corp increased its SilverBox Corp IV (SBXD) stake by 25% in Q1 2026, buying an estimated $3.23M and bringing the position to 1,514,573 shares worth $16.2M. The position accounts for 0.87% of the portfolio, ranked #21.

W.R. Berkley Corp first reported a position in SBXD in Q4 2024 and has held it in 6 quarters since. 46 funds tracked by Wall St. Rank hold SBXD as of Q1 2026.

W.R. Berkley Corp held 1,514,573 shares of SilverBox Corp IV worth $16.2M as of Q1 2026.
W.R. Berkley Corp bought 302,899 SilverBox Corp IV shares in Q1 2026, an estimated $3.23M.
SilverBox Corp IV made up 0.87% of W.R. Berkley Corp's portfolio in Q1 2026, its #21 holding.
W.R. Berkley Corp first reported a position in SilverBox Corp IV in Q4 2024 and has held it in 6 quarters since.
46 funds tracked by Wall St. Rank held SilverBox Corp IV as of Q1 2026.

Based on W.R. Berkley Corp's 13F filing for Q1 2026, filed 15 May 2026.