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Fortitude Family Office’s Quantum-Si Incorporated QSI Stock Holding History

Fortitude Family Office’s Portfolio QSI Stock Details QSI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q3 		$211 Sell
197
-1,048
-84% -$840 ﹤0.01% 2505
2026
Q2 		$1.1K Buy
+1,245
New +$1.19K ﹤0.01% 1718
2024
Q4 		– Sell
-1,462
Closed -$1.29K – 1365
2024
Q3 		$1.29K Buy
+1,462
New +$1.42K ﹤0.01% 1070

Other funds holding QSI

GAA
Green Alpha Advisors Niwot, Colorado $148M AUM 98.22% 1-Year Est. Return
DIM
DLK Investment Management Solana Beach, California $275M AUM 10.69% 1-Year Est. Return
HAS
HBW Advisory Services Simi Valley, California $1.01B AUM 17.08% 1-Year Est. Return
Y-Intercept (HK)
Y-Intercept (HK) Hong Kong $4.52B AUM 6.6% 1-Year Est. Return
FIA
FNY Investment Advisers New York $402M AUM 85.34% 1-Year Est. Return
BSB
Bangor Savings Bank Bangor, Maine $1.31B AUM 12.25% 1-Year Est. Return
TD Waterhouse Canada
TD Waterhouse Canada Toronto, Ontario, Canada $38.4B AUM 30.28% 1-Year Est. Return
GAMMA Investing
GAMMA Investing Foster City, California $2.96B AUM 34.38% 1-Year Est. Return
IFP Advisors
IFP Advisors Tampa, Florida $5.86B AUM 20.09% 1-Year Est. Return

Fortitude Family Office's QSI Position: Q3 2026 in Review

Fortitude Family Office reduced its Quantum-Si Incorporated (QSI) stake by 84% in Q3 2026, selling an estimated $840 and leaving 197 shares worth $211. The position accounts for ﹤0.01% of the portfolio, ranked #2505.

Fortitude Family Office first reported a position in QSI in Q3 2024 and has held it in 3 quarters since. The position peaked at $1.29K in Q3 2024. 10 funds tracked by Wall St. Rank hold QSI as of Q3 2026.

  • Fortitude Family Office held 197 shares of Quantum-Si Incorporated worth $211 as of Q3 2026.
  • Fortitude Family Office sold 1,048 Quantum-Si Incorporated shares in Q3 2026, an estimated $840.
  • Quantum-Si Incorporated made up ﹤0.01% of Fortitude Family Office's portfolio in Q3 2026, its #2505 holding.
  • Fortitude Family Office first reported a position in Quantum-Si Incorporated in Q3 2024 and has held it in 3 quarters since.
  • Fortitude Family Office's Quantum-Si Incorporated position peaked at $1.29K in Q3 2024.
  • 10 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q3 2026.

Based on Fortitude Family Office's 13F filing for Q3 2026, filed 14 Oct 2026.