Citadel Advisors
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Citadel Advisors’s Quantum-Si Incorporated QSI Stock Holding History

Citadel Advisors’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
Q1 		$69.8K Sell
90,200
-170,800
-65% -$177K ﹤0.01% 12256
2025
Q4 		$287K Sell
261,000
-64,700
-20% -$105K ﹤0.01% 10241
2025
Q3 		$459K Buy
325,700
+64,400
+25% +$93.1K ﹤0.01% 9350
2025
Q2 		$512K Sell
261,300
-36,500
-12% -$54K ﹤0.01% 8578
2025
Q1 		$357K Sell
297,800
-472,000
-61% -$904K ﹤0.01% 9200
2024
Q4 		$2.08M Buy
769,800
+701,700
+1,030% +$822K ﹤0.01% 5551
2024
Q3 		$60.1K Buy
68,100
+17,800
+35% +$17.3K ﹤0.01% 11703
2024
Q2 		$52.8K Sell
50,300
-50,200
-50% -$80.5K ﹤0.01% 11696
2024
Q1 		$198K Sell
100,500
-62,800
-38% -$110K ﹤0.01% 10334
2023
Q4 		$328K Sell
163,300
-56,600
-26% -$86.3K ﹤0.01% 8991
2023
Q3 		$365K Buy
219,900
+147,900
+205% +$356K ﹤0.01% 8745
2023
Q2 		$129K Sell
72,000
-1,200
-2% -$1.88K ﹤0.01% 10557
2023
Q1 		$129K Sell
73,200
-91,100
-55% -$180K ﹤0.01% 10877
2022
Q4 		$301K Buy
164,300
+46,900
+40% +$121K ﹤0.01% 9318
2022
Q3 		$323K Sell
117,400
-28,800
-20% -$92.1K ﹤0.01% 9405
2022
Q2 		$339K Sell
146,200
-2,200
-1% -$8.43K ﹤0.01% 9539
2022
Q1 		$695K Buy
148,400
+17,900
+14% +$87.2K ﹤0.01% 8591
2021
Q4 		$1.03M Buy
130,500
+42,400
+48% +$319K ﹤0.01% 7895
2021
Q3 		$735K Sell
88,100
-46,300
-34% -$456K ﹤0.01% 8935
2021
Q2 		$1.65M Buy
134,400
+51,300
+62% +$537K ﹤0.01% 7087
2021
Q1 		$991K Buy
+83,100
New +$1M ﹤0.01% 8130

Other funds holding QSI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
AIM
ARK Investment Management St. Petersburg, Florida $12.9B AUM 64.92% 1-Year Est. Return
NAMA
Nikko Asset Management Americas New York $7.07B AUM 50.91% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Citadel Advisors's QSI Position: Q1 2026 in Review

Citadel Advisors reduced its Quantum-Si Incorporated (QSI) stake by 99% in Q1 2026, selling an estimated $2.76M and leaving 15,546 shares worth $12K. The position accounts for ﹤0.01% of the portfolio, ranked #12734.

Citadel Advisors first reported a position in QSI in Q2 2021 and has held it in 17 quarters since. The position peaked at $10.5M in Q2 2021. 156 funds tracked by Wall St. Rank hold QSI as of Q1 2026.

  • Citadel Advisors held 15,546 shares of Quantum-Si Incorporated worth $12K as of Q1 2026.
  • Citadel Advisors sold 2,660,551 Quantum-Si Incorporated shares in Q1 2026, an estimated $2.76M.
  • Quantum-Si Incorporated made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #12734 holding.
  • Citadel Advisors first reported a position in Quantum-Si Incorporated in Q2 2021 and has held it in 17 quarters since.
  • Citadel Advisors's Quantum-Si Incorporated position peaked at $10.5M in Q2 2021.
  • 156 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q1 2026.

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