Penbrook Management’s One Stop Systems OSS Stock Holding History

Penbrook Management’s Portfolio OSS Stock Details OSS Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$354K	Hold	46,740	–	–	0.27%	68
2025 Q4	$336K	Sell	46,740 -673	-1%	-$3.98K	0.23%	69
2025 Q3	$254K	Buy	+47,413	New	+$260K	0.18%	81

Other funds holding OSS

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Jane Street New York $777B AUM 61.18% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Bard Associates Chicago, Illinois $398M AUM 54.32% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return

Penbrook Management's OSS Position: Q1 2026 in Review

Penbrook Management held its One Stop Systems (OSS) position steady in Q1 2026 at 46,740 shares worth $354K. The position accounts for 0.27% of the portfolio, ranked #68.

Penbrook Management first reported a position in OSS in Q3 2025 and has held it in 3 quarters since. 77 funds tracked by Wall St. Rank hold OSS as of Q1 2026.

Penbrook Management held 46,740 shares of One Stop Systems worth $354K as of Q1 2026.
Penbrook Management left its One Stop Systems share count unchanged in Q1 2026.
One Stop Systems made up 0.27% of Penbrook Management's portfolio in Q1 2026, its #68 holding.
Penbrook Management first reported a position in One Stop Systems in Q3 2025 and has held it in 3 quarters since.
77 funds tracked by Wall St. Rank held One Stop Systems as of Q1 2026.

Based on Penbrook Management's 13F filing for Q1 2026, filed 21 Apr 2026.