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 Q2	$707K	Sell	38,875 -7,865	-17%	-$110K	0.45%	56
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

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Bard Associates Chicago, Illinois $451M AUM 66.6% 1-Year Est. Return

PIP

Palisades Investment Partners Santa Monica, California $352M AUM 76.79% 1-Year Est. Return

Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

Qube Research & Technologies (QRT) London, United Kingdom $108B AUM 37.29% 1-Year Est. Return

Penbrook Management's OSS Position: Q2 2026 in Review

Penbrook Management reduced its One Stop Systems (OSS) stake by 17% in Q2 2026, selling an estimated $110K and leaving 38,875 shares worth $707K. The position accounts for 0.45% of the portfolio, ranked #56.

Penbrook Management first reported a position in OSS in Q3 2025 and has held it in 4 quarters since. 108 funds tracked by Wall St. Rank hold OSS as of Q2 2026.

Penbrook Management held 38,875 shares of One Stop Systems worth $707K as of Q2 2026.
Penbrook Management sold 7,865 One Stop Systems shares in Q2 2026, an estimated $110K.
One Stop Systems made up 0.45% of Penbrook Management's portfolio in Q2 2026, its #56 holding.
Penbrook Management first reported a position in One Stop Systems in Q3 2025 and has held it in 4 quarters since.
108 funds tracked by Wall St. Rank held One Stop Systems as of Q2 2026.

Based on Penbrook Management's 13F filing for Q2 2026, filed 23 Jul 2026.