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Q

Quantum-Si QSI · USD

Health Care · US listing · 🇺🇸 United States

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1.37

+3.01%

Close of 9 Nov 2026, in USD

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Reference data, closing prices and charts across 45,000 companies, plus crypto, commodities and currencies.

Largest shareholders

As filed, so dates differ, and a group and its funds can both appear.

HolderSharesStakeChangeFiled
VANGUARD CAPITAL MANAGEMENT LLC7.6m3.52%+556.3k30 Jun 2026
ARK INVESTMENT MANAGEMENT LLC7.2m3.33%+288.8k30 Jun 2026
BLACKROCK, INC.5.2m2.42%−8.2m30 Jun 2026
SUMITOMO MITSUI TRUST GROUP, INC.3.9m1.80%−506.4k30 Jun 2026
NIKKO ASSET MANAGEMENT AMERICAS, INC.3.9m1.80%−506.4k30 Jun 2026
MILLENNIUM MANAGEMENT LLC3.1m1.45%+3.1m30 Jun 2026
UBS GROUP AG2.6m1.19%+859.4k30 Jun 2026
AQR CAPITAL MANAGEMENT LLC2.3m1.09%−43.5k30 Jun 2026
GEODE CAPITAL MANAGEMENT, LLC2.2m1.04%−1.6m30 Jun 2026
JANE STREET GROUP, LLC2.1m0.99%+2.1m30 Jun 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP1.1m0.52%−347.8k30 Jun 2026
VANGUARD FIDUCIARY TRUST CO1.1m0.52%−56930 Jun 2026
STATE STREET CORP890.7k0.41%−2.9m30 Jun 2026
FOSUN INTERNATIONAL LTD743.9k0.35%—30 Jun 2026
RENAISSANCE TECHNOLOGIES LLC553.9k0.26%+436k30 Jun 2026

Short interest

Shares sold short, 15 Oct 2026. US exchange data.

13.2m

+11.6% on the period before. 1.0 days to cover.

Short volume

Share of the day's trading sold short, 4 Nov 2026

50.7%

Last 60 trading days.

Failed deliveries

Shares not delivered on settlement, from the SEC

  • 25 Sept 2026483 shares
  • 24 Sept 2026483 shares
  • 22 Sept 202611,582 shares
  • 18 Sept 202644,917 shares
  • 17 Sept 202613,927 shares

Sources and methodology

Data on this tab
Our data supplier
Chart on the Overview
TradingView

Nothing here is investment advice. Prices can be delayed or wrong, so check with the exchange before relying on them. Data for this page. How we cover markets.