Quantum Corporation drawdown: 99.4% below the all-time high (price)
Quantum Corporation is 99.4% below its all-time high, set Aug 17, 1999 (as of market close, Oct 20, 2026), measured on price alone — dividends are not included, the convention headlines and crash histories use. The chart shows every day as a percentage of the highest level reached up to that point: 100% means a fresh record, everything below is a drawdown.
- Below all-time high
- −99.4%
- 0.6% of ATH
- All-time high
- $3,430
- Aug 17, 1999
- Time below the high
- 27.2 yrs
- since Aug 17, 1999
- Worst-ever drawdown
- −99.9%
- Sep 6, 2024
- Longest underwater
- 27.2 yrs
- between all-time highs
- Today's level first reached
- Aug 2, 1999
- 27.2 yrs ago
- Last time this deep
- never before
- no prior −99.4% episode
% of all-time high since 1999: price#
The classic underwater chart (drawdown curve), drawn as % of the all-time high — 100% is a fresh record, everything below it is time spent underwater. Basis and range are in the URL, so a particular view is a link.
The deepest drawdowns on record#
Every decline of 15% or more from an all-time high (price basis), deepest first.
| Peak | Trough | Depth | Peak → trough | Recovered by | Underwater |
|---|---|---|---|---|---|
| Aug 17, 1999 | Sep 6, 2024 | −99.9% | 25.1 yrs | not yet | 27.2 yrs+ |
Price basis (no dividends) — the convention crash histories use. With dividends reinvested, recoveries arrive years earlier; switch the basis on the chart above to see it.
Drawdown vs what came next#
One dot per month since 1999: how far Quantum Corporation stood below its all-time high, and the total return over the following 1, 5 and 10 years.
Read this with survivorship bias in mind: a single asset's history is one surviving sample, so past recoveries here say little about the odds ahead. Monthly windows also overlap heavily (they are not independent samples). Not investment advice.
FAQ#
- How far is Quantum Corporation from its all-time high?
- Quantum Corporation is currently 99.4% below its all-time high, set Aug 17, 1999 (as of market close, Oct 20, 2026). Prices only, the convention headlines use; with dividends reinvested the gap is usually smaller.
- What was the biggest Quantum Corporation drawdown ever?
- The deepest decline on record in our data (since 1999) took Quantum Corporation 99.9% below its prior high, bottoming Sep 6, 2024. The table on this page lists every major episode with its peak, trough and recovery date.
Methodology & related#
Daily data since -1 from QMCO; no free deep history exists for Quantum Corporation — for a 150-year drawdown record see the S&P 500 drawdown page. The price basis excludes dividends; the total-return basis reinvests them; the real basis additionally deflates by CPI. See also returns by year. Past performance does not predict future returns; not investment advice.