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One Stop Systems
OSS

59 hedge funds and large institutions have $52.1M invested in One Stop Systems in 2025 Q3 according to their latest regulatory filings, with 26 funds opening new positions, 17 increasing their positions, 12 reducing their positions, and 6 closing their positions.

New
Increased
Maintained
Reduced
Closed

333% more first-time investments, than exits

New positions opened: 26 | Existing positions closed: 6

128% more capital invested

Capital invested by funds: $22.8M → $52.1M (+$29.2M)

51% more funds holding

Funds holding: 39 → 59 (+20)

42% more repeat investments, than reductions

Existing positions increased: 17 | Existing positions reduced: 12

14.51% more ownership

Funds ownership: 29.79% → 44.3% (+15%)

19% less call options, than puts

Call options by funds: $638K | Put options by funds: $783K

Holders
59
Holders Change
+20
Holders Change %
+51.28%
% of All Funds
0.77%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
26
Increased
17
Reduced
12
Closed
6
Calls
$638K
Puts
$783K
Net Calls
-$145K
Net Calls Change
-$476K

Top Buyers

Rank Fund Capital Flow
1
Citadel Advisors
Citadel Advisors
Florida
+$3.89M
2
Arrowstreet Capital
Arrowstreet Capital
Massachusetts
+$3.02M
3
ACM
Archon Capital Management
Washington
+$1.77M
4
PAMP
Polar Asset Management Partners
Ontario, Canada
+$1.6M
5
Renaissance Technologies
Renaissance Technologies
New York
+$1.59M

Top Sellers

Rank Fund Capital Flow
1
LLL
Lynrock Lake LP
New York
-$3.32M
2
BA
Bard Associates
Illinois
-$167K
3
VF
Virtu Financial
New York
-$130K
4
Morgan Stanley
Morgan Stanley
New York
-$89.2K
5
EIM
Essex Investment Management
Massachusetts
-$88.9K
Name Holding Trade Value Shares
Change 		Change in
Stake
Simplex Trading
51
Simplex Trading
Illinois
$12K -$61.4K -11,221 -83%
ASN
52
Advisory Services Network
Georgia
$11.7K +$12K +2,191 New
UBS Group
53
UBS Group
Switzerland
$10.2K -$37.4K -6,835 -78%
Osaic Holdings
54
Osaic Holdings
Arizona
$9.49K +$6.27K +1,145 +229%
Wells Fargo
55
Wells Fargo
California
$5.36K – – –
SHIM
56
Stone House Investment Management
Pennsylvania
$1.61K +$1.64K +300 New
AAP
57
Arax Advisory Partners
Colorado
$858 +$876 +160 New
SS
58
SBI Securities
Japan
$5 -$1.09K -200 -100%
QC
59
Quadrature Capital
United Kingdom
– -$57K -16,025 Closed
Walleye Capital
60
Walleye Capital
New York
– -$45.6K -12,857 Closed
GIP
61
Granite Investment Partners
California
– -$39.3K -11,068 Closed
Group One Trading
62
Group One Trading
Illinois
– -$45.7K -8,348 Closed
MCM
63
MAI Capital Management
Ohio
– -$5.12K -1,441 Closed
Citigroup
64
Citigroup
New York
– -$1.17K -330 Closed
Royal Bank of Canada
65
Royal Bank of Canada
Ontario, Canada
– +$27 +5 New
1 2
3

OSS Hedge Fund Activity: Q3 2025 in Review

59 of the 7,625 institutional investors tracked by Wall St. Rank reported a position in One Stop Systems (OSS) for Q3 2025, worth a combined $52.1M — up 128% from $22.8M a quarter earlier.

Buyers outnumbered sellers: 26 funds opened new OSS positions and 6 closed out — a net gain of 20 holders — while 17 added to existing stakes and 12 trimmed.

The largest buyer was Citadel Advisors, adding an estimated $3.89M. The largest seller was Lynrock Lake LP, cutting an estimated $3.32M.

  • 59 institutional investors held One Stop Systems (OSS) as of Q3 2025, up from 39 in Q2 2025.
  • Funds reported $52.1M of One Stop Systems stock for Q3 2025, up 128% quarter-over-quarter.
  • 26 funds opened new One Stop Systems positions in Q3 2025 and 6 closed out, a net change of +20 holders.
  • The largest One Stop Systems buyer in Q3 2025 was Citadel Advisors, an estimated $3.89M added.
  • The largest One Stop Systems seller in Q3 2025 was Lynrock Lake LP, an estimated $3.32M sold.

Based on aggregated 13F filings for Q3 2025.