greeksoup/ stock research
Stock research / United States / QMCO / Short interest

Quantum Corp. short interest

3.1M shares of Quantum were sold short at the 15 October 2026 settlement, near the top of its range over the last year (1.0M to 3.1M). Short sellers would need 1.6 days of normal trading to buy them back.

Shares sold short3.1Mat 15 Oct 2026
Change on the settlement before-1.6%+53% over a year
Days to cover1.57at 2.0M shares a day
Of shares in issue7.80%shares short over shares outstanding
New to this? How to read this page
  1. Short interest is the number of shares investors have borrowed and sold, betting the price will fall, and not yet bought back.
  2. Days to cover is shares short over an average day's trading: how many days it would take short sellers to buy them all back. Above 5 or so is high.
  3. Rising short interest says more investors are betting against the stock. A crowded short can also rise fast if shorts rush to buy back.
  4. Brokers report it twice a month to FINRA, about ten days after each settlement date.
  5. What is short interest?

Short interest, days to cover and the price

Short interest is near the top of its range over the last year (1.0M to 3.1M), and the share price moved +67% over the last year.

Shares sold shortDays to coverShare price

Three charts on one timeline. Top: shares sold short at each settlement. Middle: days to cover, taller meaning shorts would need longer to buy back. Bottom: the share price, so you can see whether shorts added as the price fell or rose. Counts before a split are restated to today's shares, the way the price is.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every settlement since 15 Jan 2019 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 20263.1M-1.6%2.0M1.57
    30 September 20263.1M+52.7%2.2M1.44
    15 September 20262.0M+12.0%939K2.18
    31 August 20261.8M-8.9%1.3M1.46
    14 August 20262.0M-16.9%3.5M1.00
    31 July 20262.4M+5.4%954K2.53
    15 July 20262.3M+6.6%799K2.86
    30 June 20262.1M+111.7%1.2M1.76
    15 June 20261.0M-27.2%2.2M1.00
    29 May 20261.4M-9.3%709K1.96
    15 May 20261.5M-13.7%718K2.14
    30 April 20261.8M-10.0%341K5.22
    15 April 20262.0M+10.0%524K3.77
    31 March 20261.8M-11.2%351K5.12
    13 March 20262.0M-12.7%469K4.31
    27 February 20262.3M+10.3%630K3.68
    13 February 20262.1M+23.4%524K4.01
    30 January 20261.7M+4.5%563K3.03
    15 January 20261.6M+3.6%569K2.87
    31 December 20251.6M-7.7%530K2.97
    15 December 20251.7M+11.7%476K3.58
    28 November 20251.5M+0.9%636K2.40
    14 November 20251.5M-20.2%779K1.94
    31 October 20251.9M-5.5%1.1M1.66
    15 October 20252.0M-12.7%3.2M1.00
    30 September 20252.3M+23.5%4.6M1.00
    15 September 20251.9M+18.6%878K2.12
    29 August 20251.6M-9.7%471K3.33
    15 August 20251.7M-4.0%519K3.35
    31 July 20251.8M-8.6%803K2.25
    15 July 20252.0M+0.1%778K2.54
    30 June 20252.0M-6.7%1.5M1.33
    13 June 20252.1M+32.3%1.9M1.11
    30 May 20251.6M+11.8%4.7M1.00
    15 May 20251.4M-16.4%861K1.66
    30 April 20251.7M+12.8%516K3.32
    15 April 20251.5M-0.0%643K2.36
    31 March 20251.5M+3.7%2.5M1.00
    14 March 20251.5M+17.7%1.3M1.09
    28 February 20251.2M-7.6%1.0M1.21
    14 February 20251.3M-4.0%1.3M1.07
    31 January 20251.4M+1.0%1.4M1.00
    15 January 20251.4M+15.4%2.2M1.00
    31 December 20241.2M+37.6%5.9M1.00
    13 December 2024873K+25.9%2.4M1.00
    29 November 2024694K+215.8%10.4M1.00
    15 November 2024220K+16.6%74K2.96
    31 October 2024188K-13.6%65K2.90
    15 October 2024218K-4.3%16K13.76
    30 September 2024228K+5.6%27K8.44
    13 September 2024216K+3055.3%54K3.99
    30 August 20247K-82.1%6K1.11
    15 August 202438K+84.2%11K3.33
    31 July 202421K+75.1%13K1.63
    15 July 202412K-11.9%14K1.00
    28 June 202413K+98.8%75K1.00
    14 June 20247K+9.4%12K1.00
    31 May 20246K-43.9%6K1.00
    15 May 202411K+17.8%9K1.21
    30 April 20249K-37.7%8K1.18
    15 April 202415K+20.2%12K1.21
    28 March 202412K-39.0%20K1.00
    15 March 202420K-30.8%20K1.02
    29 February 202430K+245.0%27K1.08
    15 February 20249K-6.3%63K1.00
    31 January 20249K+74.0%11K1.00
    12 January 20245K+20.5%6K1.00
    29 December 20234K-69.5%21K1.00
    15 December 202314K+29.9%36K1.00
    30 November 202311K+52.4%30K1.00
    15 November 20237K+29.2%12K1.00
    31 October 20236K-21.4%15K1.00
    13 October 20237K-0.5%5K1.38
    29 September 20237K-47.8%5K1.36
    15 September 202314K-32.2%17K1.00
    31 August 202320K+5.3%13K1.60
    15 August 202319K+113.2%41K1.00
    31 July 20239K-22.0%16K1.00
    14 July 202312K-39.2%16K1.00
    30 June 202319K-3.6%14K1.32
    15 June 202320K-5.0%21K1.00
    31 May 202321K+8.7%16K1.29
    15 May 202319K-4.0%4K5.41
    28 April 202320K+27.4%5K3.88
    14 April 202316K+6.5%7K2.39
    31 March 202315K-15.5%8K1.84
    15 March 202317K+49.0%11K1.58
    28 February 202312K-13.6%6K1.87
    15 February 202313K-5.8%17K1.00
    31 January 202314K-7.8%7K2.08
    13 January 202315K-7.4%6K2.42
    30 December 202217K-51.7%16K1.05
    15 December 202235K-27.0%19K1.86
    30 November 202247K-18.8%10K4.92
    15 November 202258K-13.4%8K7.39
    31 October 202267K+1.0%6K11.42
    14 October 202267K-1.5%6K11.00
    30 September 202268K+10.9%25K2.70
    15 September 202261K-2.9%14K4.48
    31 August 202263K-32.3%15K4.30
    15 August 202293K+41.3%26K3.51
    29 July 202266K-13.5%14K4.73
    15 July 202276K-2.5%14K5.39
    30 June 202278K-58.8%72K1.08
    15 June 2022189K+0.9%26K7.32
    31 May 2022188K+4.2%21K9.09
    13 May 2022180K+8.2%26K6.79
    29 April 2022166K-6.0%28K5.92
    14 April 2022177K+21.2%33K5.44
    31 March 2022146K+27.1%51K2.86
    15 March 2022115K+18.6%20K5.73
    28 February 202297K-2.3%26K3.70
    15 February 202299K+46.3%56K1.77
    31 January 202268K+13.0%13K5.28
    14 January 202260K-0.1%11K5.31
    31 December 202160K-2.1%16K3.77
    15 December 202161K-4.1%15K4.14
    30 November 202164K-9.2%13K5.06
    15 November 202170K-19.7%19K3.70
    29 October 202188K+3.1%8K10.73
    15 October 202185K-6.7%11K7.78
    30 September 202191K-1.5%15K6.13
    15 September 202193K-7.2%13K7.26
    31 August 2021100K+18.6%15K6.56
    13 August 202184K+3.5%17K4.96
    30 July 202181K+11.3%15K5.52
    15 July 202173K+16.8%18K4.01
    30 June 202162K+46.8%40K1.58
    15 June 202143K-1.3%28K1.53
    28 May 202143K-3.0%17K2.52
    14 May 202144K-4.1%15K2.90
    30 April 202146K+2.3%15K3.18
    15 April 202145K+1.9%11K4.01
    31 March 202144K+43.1%26K1.70
    15 March 202131K+11.3%18K1.77
    26 February 202128K-3.3%16K1.70
    12 February 202129K-34.3%50K1.00
    29 January 202144K+0.3%9K4.84
    15 January 202144K+1.5%10K4.55
    31 December 202043K+9.9%9K4.91
    15 December 202039K-13.6%8K5.09
    30 November 202045K-1.1%6K7.10
    13 November 202046K-11.0%5K8.90
    30 October 202052K-4.8%5K10.92
    15 October 202054K+3.1%5K11.85
    30 September 202053K+10.6%10K5.50
    15 September 202048K-19.4%6K8.00
    31 August 202059K+14.1%8K7.65
    14 August 202052K-12.9%10K5.21
    31 July 202059K+0.2%7K8.52
    15 July 202059K-10.6%12K4.84
    30 June 202066K+576.7%45K1.47
    15 June 202010K+46.9%14K1.00
    29 May 20207K+1.8%11K1.00
    15 May 20207K-2.4%12K1.00
    30 April 20207K-5.2%9K1.00
    15 April 20207K+42.8%14K1.00
    31 March 20205K-51.0%22K1.00
    13 March 202010K-37.9%21K1.00
    28 February 202016K-2.9%11K1.47
    14 February 202017K+18.7%8K2.15
    31 January 202014K+13.5%33K1.00
    15 January 202012K-2.6%5K2.44
    31 December 201913K+8.9%9K1.42
    13 December 201912K+0.4%17K1.00
    29 November 201912K-5.1%4K2.67
    15 November 201912K-12.2%7K1.80
    31 October 201914K-4.6%5K2.82
    15 October 201915K-14.5%3K5.14
    30 September 201917K-4.1%3K5.39
    13 September 201918K-6.7%7K2.43
    30 August 201919K-11.2%8K2.37
    15 August 201922K-8.9%34K1.00
    31 July 201924K+1.6%4K6.12
    15 July 201923K-25.8%4K6.30
    28 June 201932K+26.6%14K2.23
    14 June 201925K-5.5%8K3.25
    31 May 201926K-5.3%4K7.05
    15 May 201928K-2.1%6K4.37
    30 April 201928K+3.3%4K7.30
    15 April 201928K-6.2%4K6.74
    29 March 201929K-4.0%3K11.75
    15 March 201931K-7.2%3K8.80
    28 February 201933K-2.0%7K4.69
    15 February 201934K-16.6%24K1.41
    31 January 201940K-31.9%58K1.00
    15 January 201959K26K2.25
    Shares in millions (M) or thousands (K); hold the pointer on a figure for the exact count. Counts before a split are restated to today's shares. FINRA publishes consolidated short interest twice a month, about ten days after each settlement.