Mariner
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Mariner’s Quantum-Si Incorporated QSI Stock Holding History

Mariner’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
Q2 		$140K Sell
157,689
-42,003
-21% -$40K ﹤0.01% 3257
2026
Q1 		$155K Buy
199,692
+142,812
+251% +$148K ﹤0.01% 3229
2025
Q4 		$62.6K Buy
56,880
+6,351
+13% +$10.3K ﹤0.01% 3396
2025
Q3 		$71.2K Sell
50,529
-65
-0.1% -$94 ﹤0.01% 3408
2025
Q2 		$99.2K Buy
50,594
+2,589
+5% +$3.83K ﹤0.01% 3247
2025
Q1 		$57.6K Buy
48,005
+14,566
+44% +$27.9K ﹤0.01% 3292
2024
Q4 		$90.3K Buy
33,439
+7,540
+29% +$8.84K ﹤0.01% 3204
2024
Q3 		$22.8K Buy
+25,899
New +$25.1K ﹤0.01% 3239
2023
Q4 		– Sell
-11,263
Closed -$18.7K – 3157
2023
Q3 		$18.7K Buy
+11,263
New +$27.1K ﹤0.01% 2846

Other funds holding QSI

Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
AIM
ARK Investment Management St. Petersburg, Florida $15.4B AUM 50.29% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
NAMA
Nikko Asset Management Americas New York $7.75B AUM 33.73% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Jane Street
Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

Mariner's QSI Position: Q2 2026 in Review

Mariner reduced its Quantum-Si Incorporated (QSI) stake by 21% in Q2 2026, selling an estimated $40K and leaving 157,689 shares worth $140K. The position accounts for ﹤0.01% of the portfolio, ranked #3257.

Mariner first reported a position in QSI in Q3 2023 and has held it in 9 quarters since. The position peaked at $155K in Q1 2026. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • Mariner held 157,689 shares of Quantum-Si Incorporated worth $140K as of Q2 2026.
  • Mariner sold 42,003 Quantum-Si Incorporated shares in Q2 2026, an estimated $40K.
  • Quantum-Si Incorporated made up ﹤0.01% of Mariner's portfolio in Q2 2026, its #3257 holding.
  • Mariner first reported a position in Quantum-Si Incorporated in Q3 2023 and has held it in 9 quarters since.
  • Mariner's Quantum-Si Incorporated position peaked at $155K in Q1 2026.
  • 141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Mariner's 13F filing for Q2 2026, filed 13 Aug 2026.