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 		$88.1K Sell
113,800
-442,200
-80% -$458K ﹤0.01% 12123
2025
Q4 		$612K Buy
556,000
+91,300
+20% +$149K ﹤0.01% 8551
2025
Q3 		$655K Sell
464,700
-47,100
-9% -$68.1K ﹤0.01% 8491
2025
Q2 		$1M Sell
511,800
-9,900
-2% -$14.6K ﹤0.01% 7073
2025
Q1 		$626K Buy
521,700
+226,400
+77% +$434K ﹤0.01% 7980
2024
Q4 		$797K Buy
295,300
+288,600
+4,307% +$338K ﹤0.01% 7513
2024
Q3 		$5.91K Buy
6,700
+2,600
+63% +$2.52K ﹤0.01% 13456
2024
Q2 		$4.3K Sell
4,100
-1,200
-23% -$1.92K ﹤0.01% 13497
2024
Q1 		$10.4K Sell
5,300
-15,700
-75% -$27.4K ﹤0.01% 13460
2023
Q4 		$42.2K Sell
21,000
-5,000
-19% -$7.62K ﹤0.01% 11962
2023
Q3 		$43.2K Sell
26,000
-7,900
-23% -$19K ﹤0.01% 11918
2023
Q2 		$60.7K Hold
33,900
– – ﹤0.01% 11576
2023
Q1 		$59.7K Sell
33,900
-21,100
-38% -$41.6K ﹤0.01% 11938
2022
Q4 		$101K Buy
55,000
+29,500
+116% +$76K ﹤0.01% 11210
2022
Q3 		$70K Buy
25,500
+13,500
+113% +$43.2K ﹤0.01% 11390
2022
Q2 		$28K Sell
12,000
-1,400
-10% -$5.36K ﹤0.01% 12265
2022
Q1 		$63K Sell
13,400
-5,300
-28% -$25.8K ﹤0.01% 12648
2021
Q4 		$147K Buy
18,700
+2,200
+13% +$16.6K ﹤0.01% 12286
2021
Q3 		$138K Sell
16,500
-39,700
-71% -$391K ﹤0.01% 12474
2021
Q2 		$689K Buy
56,200
+26,100
+87% +$273K ﹤0.01% 9280
2021
Q1 		$359K Buy
+30,100
New +$364K ﹤0.01% 10434

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.