Citadel Advisors
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Citadel Advisors’s One Stop Systems OSS Stock Holding History

Citadel Advisors’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 		$2.7M Buy
356,676
+211,000
+145% +$1.97M ﹤0.01% 5477
2025
Q4 		$1.05M Sell
145,676
-719,263
-83% -$4.25M ﹤0.01% 7304
2025
Q3 		$4.64M Buy
864,939
+711,401
+463% +$3.89M ﹤0.01% 4497
2025
Q2 		$545K Buy
153,538
+123,107
+405% +$343K ﹤0.01% 8433
2025
Q1 		$70.6K Sell
30,431
-66,642
-69% -$223K ﹤0.01% 11901
2024
Q4 		$325K Buy
97,073
+33,643
+53% +$85.4K ﹤0.01% 9487
2024
Q3 		$152K Sell
63,430
-16,862
-21% -$37.4K ﹤0.01% 10553
2024
Q2 		$194K Buy
80,292
+79,425
+9,161% +$211K ﹤0.01% 9988
2024
Q1 		$2.83K Sell
867
-10,102
-92% -$27.6K ﹤0.01% 13969
2023
Q4 		$23K Buy
+10,969
New +$22.1K ﹤0.01% 12503
2023
Q3 		– Sell
-32,942
Closed -$94.5K – 14864
2023
Q2 		$94.5K Sell
32,942
-3,605
-10% -$9.54K ﹤0.01% 11024
2023
Q1 		$90.6K Buy
+36,547
New +$110K ﹤0.01% 11405
2022
Q4 		– Sell
-10,958
Closed -$35K – 15288
2022
Q3 		$35K Buy
+10,958
New +$41.6K ﹤0.01% 11825
2021
Q4 		– Sell
-26,757
Closed -$134K – 14472
2021
Q3 		$134K Buy
26,757
+16,467
+160% +$91.3K ﹤0.01% 12506
2021
Q2 		$60K Sell
10,290
-15,285
-60% -$86.3K ﹤0.01% 13248
2021
Q1 		$162K Buy
+25,575
New +$156K ﹤0.01% 11953

Other funds holding OSS

VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Jane Street
Jane Street New York $777B AUM 61.18% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
BA
Bard Associates Chicago, Illinois $398M AUM 54.32% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return
DnB Asset Management
DnB Asset Management Oslo, Norway $28B AUM 26% 1-Year Est. Return

Citadel Advisors's OSS Position: Q1 2026 in Review

Citadel Advisors increased its One Stop Systems (OSS) stake by 145% in Q1 2026, buying an estimated $1.97M and bringing the position to 356,676 shares worth $2.7M. The position accounts for ﹤0.01% of the portfolio, ranked #5477.

Citadel Advisors first reported a position in OSS in Q1 2021 and has held it in 16 quarters since. The position peaked at $4.64M in Q3 2025. 77 funds tracked by Wall St. Rank hold OSS as of Q1 2026.

  • Citadel Advisors held 356,676 shares of One Stop Systems worth $2.7M as of Q1 2026.
  • Citadel Advisors bought 211,000 One Stop Systems shares in Q1 2026, an estimated $1.97M.
  • One Stop Systems made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #5477 holding.
  • Citadel Advisors first reported a position in One Stop Systems in Q1 2021 and has held it in 16 quarters since.
  • Citadel Advisors's One Stop Systems position peaked at $4.64M in Q3 2025.
  • 77 funds tracked by Wall St. Rank held One Stop Systems as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.