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One Stop Systems
OSS

Overview Fund Activity

38 hedge funds and large institutions have $22.8M invested in One Stop Systems in 2025 Q2 according to their latest regulatory filings, with 9 funds opening new positions, 13 increasing their positions, 11 reducing their positions, and 4 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
38
Holders Change
+5
Holders Change %
+15.15%
% of All Funds
0.51%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
9
Increased
13
Reduced
11
Closed
4
Calls
$555K
Puts
$224K
Net Calls
+$331K
Net Calls Change
+$389K

Top Buyers

1
Marshall Wace
Marshall Wace
United Kingdom
$1.69M
2
Jane Street
Jane Street
New York
$952K
3
EI
EAM Investors
California
$481K
4
Citadel Advisors
Citadel Advisors
Florida
$545K
5
VF
Virtu Financial
New York
$179K

Top Sellers

1
BA
Bard Associates
Illinois
$3.36M
2
LLL
Lynrock Lake LP
New York
$7.28M
3
UBS Group
UBS Group
Switzerland
$31K
4
GCP
GSA Capital Partners
United Kingdom
$0
5
PRCP
Pacific Ridge Capital Partners
Oregon
$1.61M
Name Holding Trade Value Shares
Change 		Shares
Change %
Simplex Trading
26
Simplex Trading
Illinois
$48K -$13.2K -3,742 -22%
Charles Schwab
27
Charles Schwab
California
$45.8K – – –
Walleye Capital
28
Walleye Capital
New York
$45.6K +$45.6K +12,857 New
GIP
29
Granite Investment Partners
California
$39.3K +$39.3K +11,068 New
MG
30
Marex Group
$35.5K +$35.5K +10,000 New
UBS Group
31
UBS Group
Switzerland
$31K -$41.9K -11,811 -57%
Group One Trading
32
Group One Trading
Illinois
$29.6K -$6.61K -1,862 -18%
Bank of America
33
Bank of America
North Carolina
$17.8K +$17.3K +4,866 +3,223%
MCM
34
MAI Capital Management
Ohio
$5.12K – – –
TRCT
35
Tower Research Capital (TRC)
New York
$4.06K -$2.15K -605 -35%
Wells Fargo
36
Wells Fargo
California
$3.55K – – –
Citigroup
37
Citigroup
New York
$1.17K +$1.17K +330 New
SS
38
SBI Securities
Japan
$714 -$355 -100 -33%
GCP
39
GSA Capital Partners
United Kingdom
– -$30K -13,127 Closed
JPMorgan Chase & Co
40
JPMorgan Chase & Co
New York
– -$8.64K -3,723 Closed
Lazard Asset Management
41
Lazard Asset Management
New York
– -$1K -845 Closed
OP
42
ORG Partners
Indiana
– -$279 -120 Closed
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