Quantum Corporation (QMCO)
NASDAQ: QMCO · Real-Time Price · USD
21.61
-2.25 (-9.45%)
At close: Oct 15, 2026, 4:00 PM EDT
21.58
-0.03 (-0.12%)
After-hours: Oct 15, 2026, 7:55 PM EDT
Quantum Market Cap
Quantum has a market cap or net worth of $851.45 million as of October 15, 2026. It is the 11,081st most valuable company in the world and the 2,345th biggest in the United States. Its market cap has increased by 403.82% in one year.
Market Cap
851.45M
Enterprise Value
805.86M
1-Year Change
403.82%
Global Rank
Country Rank
#2,345 United States
Category
ChartMarket Cap Chart
Since August 2, 1999, Quantum's market cap has decreased from $3.22B to $851.45M, a decrease of -73.57%. That is a compound annual growth rate of -4.77%.
| Date | Market Cap | % Change |
|---|---|---|
| Oct 15, 2026 | 851.50M | 862.15% |
| Dec 31, 2025 | 88.50M | -66.14% |
| Dec 31, 2024 | 261.40M | 687.35% |
| Dec 29, 2023 | 33.20M | -70.67% |
| Dec 30, 2022 | 113.20M | -65.40% |
| Dec 31, 2021 | 327.20M | 31.25% |
| Dec 31, 2020 | 249.30M | -9.05% |
| Dec 31, 2019 | 274.10M | 295.53% |
| Dec 31, 2018 | 69.30M | -64.50% |
| Dec 29, 2017 | 195.20M | -13.51% |
| Dec 30, 2016 | 225.70M | -8.03% |
| Dec 31, 2015 | 245.40M | -45.43% |
| Dec 31, 2014 | 449.70M | 51.06% |
| Dec 31, 2013 | 297.70M | -0.27% |
| Dec 31, 2012 | 298.50M | -46.78% |
| Dec 30, 2011 | 560.90M | -31.77% |
| Dec 31, 2010 | 822.10M | 31.73% |
| Dec 31, 2009 | 624.10M | 725.53% |
| Dec 31, 2008 | 75.60M | -86.23% |
| Dec 31, 2007 | 549.00M | 21.92% |
| Dec 29, 2006 | 450.30M | -20.58% |
| Dec 30, 2005 | 567.00M | 18.64% |
| Dec 31, 2004 | 477.90M | -13.95% |
| Dec 31, 2003 | 555.40M | 31.61% |
| Dec 31, 2002 | 422.00M | -72.44% |
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Market Capitalization
Market capitalization, also called net worth, is the total value of all of a company's outstanding shares. It is calculated by multiplying the stock price by the number of shares outstanding.
Formula: Market Cap = Stock Price * Shares Outstanding
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