Jane Street
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Jane Street’s Flexible Solutions FSI Stock Holding History

Jane Street’s Portfolio FSI Stock Details FSI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-13,363
Closed -$129K – 11557
2025
Q3 		$129K Buy
+13,363
New +$101K ﹤0.01% 9990
2020
Q2 		– Sell
-20,195
Closed -$24K – 7218
2020
Q1 		$24K Sell
20,195
-58,458
-74% -$119K ﹤0.01% 5163
2019
Q4 		$202K Sell
78,653
-35,396
-31% -$90.9K ﹤0.01% 4720
2019
Q3 		$269K Buy
114,049
+102,419
+881% +$316K ﹤0.01% 4284
2019
Q2 		$52K Buy
+11,630
New +$36.7K ﹤0.01% 4948

Other funds holding FSI

Renaissance Technologies
Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
PCM
Perritt Capital Management Chicago, Illinois $59.8M AUM 26.94% 1-Year Est. Return
SL
Sentinus LLC Oak Brook, Illinois $1.11B AUM 17.13% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
BCM
Beartown Capital Management Huntington Woods, Michigan $209M AUM
EI
EAM Investors Solana Beach, California $866M AUM 377.14% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
OSAM
O'Shaughnessy Asset Management Stamford, Connecticut $20.1B AUM 30.42% 1-Year Est. Return
SEI Investments
SEI Investments Oaks, Pennsylvania $108B AUM 26.14% 1-Year Est. Return

Jane Street's FSI Position: Q4 2025 in Review

Jane Street sold out of Flexible Solutions (FSI) in Q4 2025, closing a stake of 13,363 shares — an estimated $129K sold.

Jane Street first reported a position in FSI in Q2 2019 and held it in 5 quarters. The position peaked at $269K in Q3 2019. 30 funds tracked by Wall St. Rank hold FSI as of Q4 2025.

  • Jane Street reported no remaining Flexible Solutions position as of Q4 2025 after selling out during the quarter.
  • Jane Street sold 13,363 Flexible Solutions shares in Q4 2025, an estimated $129K.
  • Jane Street first reported a position in Flexible Solutions in Q2 2019 and held it in 5 quarters.
  • Jane Street's Flexible Solutions position peaked at $269K in Q3 2019.
  • 30 funds tracked by Wall St. Rank held Flexible Solutions as of Q4 2025.

Based on Jane Street's 13F filing for Q4 2025, filed 12 Feb 2026.