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Q

Quantum QMCO · USD

Information Technology · US listing · 🇺🇸 United States

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16.99

+17.42%

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
Lerner (James J)110.8k0.81%—20 Oct 2025
Gianella (Kenneth Philippe)32.4k0.24%—20 Oct 2025
White (Yue Zhou)29.1k0.21%—20 Oct 2025
Cabrera (Brian E)28.7k0.21%—20 Oct 2025
Jaworksi (Don)27.7k0.20%—20 Oct 2025
Meyrath (Hugues)24.7k0.18%−3k20 Oct 2025
Fichthorn (John)15.3k0.11%—20 Oct 2025
Tracy (John R.)15k0.11%—20 Oct 2025
Nash (Laura A.)11.1k0.08%−2292 Oct 2025
Farther Finance Advisors, LLC3040.00%+30030 Sept 2025
Whittier Trust Company1870.00%—30 Sept 2025

Short interest

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

3.1m

-1.6% on the period before. 1.6 days to cover.

Short volume

Share of the day's trading sold short, 5 Nov 2026

49.6%

Last 60 trading days.

Failed deliveries

Shares not delivered on settlement, from the SEC

  • 28 Sept 202642 shares
  • 22 Sept 20264,367 shares
  • 21 Sept 2026930 shares
  • 15 Sept 2026200 shares
  • 11 Sept 2026200 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.