Vanguard Portfolio Management
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Vanguard Portfolio Management’s Quantum-Si Incorporated QSI Stock Holding History

Vanguard Portfolio Management’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 		$440K Sell
497,098
-1,023,548
-67% -$975K ﹤0.01% 3067
2026
Q1 		$1.18M Buy
+1,520,646
New +$1.58M ﹤0.01% 2757

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

Vanguard Portfolio Management's QSI Position: Q2 2026 in Review

Vanguard Portfolio Management reduced its Quantum-Si Incorporated (QSI) stake by 67% in Q2 2026, selling an estimated $975K and leaving 497,098 shares worth $440K. The position accounts for ﹤0.01% of the portfolio, ranked #3067.

Vanguard Portfolio Management first reported a position in QSI in Q1 2026 and has held it in 2 quarters since. The position peaked at $1.18M in Q1 2026. 139 funds tracked by Wall St. Rank hold QSI as of Q2 2026.

  • Vanguard Portfolio Management held 497,098 shares of Quantum-Si Incorporated worth $440K as of Q2 2026.
  • Vanguard Portfolio Management sold 1,023,548 Quantum-Si Incorporated shares in Q2 2026, an estimated $975K.
  • Quantum-Si Incorporated made up ﹤0.01% of Vanguard Portfolio Management's portfolio in Q2 2026, its #3067 holding.
  • Vanguard Portfolio Management first reported a position in Quantum-Si Incorporated in Q1 2026 and has held it in 2 quarters since.
  • Vanguard Portfolio Management's Quantum-Si Incorporated position peaked at $1.18M in Q1 2026.
  • 139 funds tracked by Wall St. Rank held Quantum-Si Incorporated as of Q2 2026.

Based on Vanguard Portfolio Management's 13F filing for Q2 2026, filed 13 Aug 2026.