RhumbLine Advisers
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RhumbLine Advisers’s Quantum-Si Incorporated QSI Stock Holding History

RhumbLine Advisers’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 		$67.2K Sell
75,989
-117,079
-61% -$111K ﹤0.01% 3633
2026
Q1 		$149K Sell
193,068
-527
-0.3% -$546 ﹤0.01% 3246
2025
Q4 		$213K Sell
193,595
-26,370
-12% -$42.9K ﹤0.01% 3156
2025
Q3 		$310K Buy
219,965
+15,998
+8% +$23.1K ﹤0.01% 2973
2025
Q2 		$400K Buy
203,967
+53,994
+36% +$79.9K ﹤0.01% 2822
2025
Q1 		$180K Buy
149,973
+1,027
+0.7% +$1.97K ﹤0.01% 3158
2024
Q4 		$402K Buy
148,946
+5,298
+4% +$6.21K ﹤0.01% 2808
2024
Q3 		$127K Sell
143,648
-1,551
-1% -$1.51K ﹤0.01% 3436
2024
Q2 		$152K Buy
145,199
+465
+0.3% +$745 ﹤0.01% 3376
2024
Q1 		$285K Buy
144,734
+3,963
+3% +$6.92K ﹤0.01% 3011
2023
Q4 		$283K Sell
140,771
-2,069
-1% -$3.15K ﹤0.01% 3006
2023
Q3 		$237K Buy
142,840
+4,088
+3% +$9.85K ﹤0.01% 3062
2023
Q2 		$248K Buy
138,752
+2,330
+2% +$3.65K ﹤0.01% 3122
2023
Q1 		$240K Buy
136,422
+1,808
+1% +$3.57K ﹤0.01% 2689
2022
Q4 		$246K Buy
134,614
+2,018
+2% +$5.2K ﹤0.01% 2735
2022
Q3 		$365K Buy
132,596
+7,503
+6% +$24K ﹤0.01% 2638
2022
Q2 		$290K Buy
+125,093
New +$479K ﹤0.01% 2774

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

RhumbLine Advisers's QSI Position: Q2 2026 in Review

RhumbLine Advisers reduced its Quantum-Si Incorporated (QSI) stake by 61% in Q2 2026, selling an estimated $111K and leaving 75,989 shares worth $67.2K. The position accounts for ﹤0.01% of the portfolio, ranked #3633.

RhumbLine Advisers first reported a position in QSI in Q2 2022 and has held it in 17 quarters since. The position peaked at $402K in Q4 2024. 141 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • RhumbLine Advisers held 75,989 shares of Quantum-Si Incorporated worth $67.2K as of Q2 2026.
  • RhumbLine Advisers sold 117,079 Quantum-Si Incorporated shares in Q2 2026, an estimated $111K.
  • Quantum-Si Incorporated made up ﹤0.01% of RhumbLine Advisers's portfolio in Q2 2026, its #3633 holding.
  • RhumbLine Advisers first reported a position in Quantum-Si Incorporated in Q2 2022 and has held it in 17 quarters since.
  • RhumbLine Advisers's Quantum-Si Incorporated position peaked at $402K in Q4 2024.
  • 141 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on RhumbLine Advisers's 13F filing for Q2 2026, filed 12 Aug 2026.