Quantum (QMCO)
Quantum on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as computer storage devices.
3.1M
Short interest
settlement 2026-09-30
1.4
Days to cover
-0.7 days vs prior
66.5%
Short share of volume
2026-10-13
200
Fails to deliver
settlement 2026-09-11
Mon 18 Aug
Last earnings
reported (8-K Item 2.02)
-$16K
Insider flow, 90 days
0 buys, 1 sells
As of 2026-10-13.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in QMCO is 3,122,337 shares, up 1,296,729 shares over the last month. Over the last 48 readings it ranged from 188,349 shares (31 October 2024) to 3,122,337 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 2.2M shares a day that is 1.4 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 3,122,337 | +52.7% | 2,174,445 | 1.44 |
| 2026-09-15 | 2,045,010 | +12.0% | 938,840 | 2.18 |
| 2026-08-31 | 1,825,608 | -8.9% | 1,252,558 | 1.46 |
| 2026-08-14 | 2,003,862 | -16.9% | 3,471,319 | 1.00 |
| 2026-07-31 | 2,411,356 | +5.4% | 954,445 | 2.53 |
| 2026-07-15 | 2,288,430 | +6.6% | 799,106 | 2.86 |
| 2026-06-30 | 2,146,146 | +111.7% | 1,217,407 | 1.76 |
| 2026-06-15 | 1,013,568 | -27.2% | 2,237,051 | 1.00 |
| 2026-05-29 | 1,392,155 | -9.3% | 709,408 | 1.96 |
| 2026-05-15 | 1,535,366 | -13.7% | 717,786 | 2.14 |
| 2026-04-30 | 1,778,340 | -10.0% | 340,806 | 5.22 |
| 2026-04-15 | 1,976,798 | +10.1% | 523,985 | 3.77 |
| 2026-03-31 | 1,796,279 | -11.2% | 350,565 | 5.12 |
| 2026-03-13 | 2,022,035 | -12.7% | 469,011 | 4.31 |
| 2026-02-27 | 2,316,565 | +10.3% | 630,046 | 3.68 |
| 2026-02-13 | 2,100,850 | +23.4% | 523,685 | 4.01 |
| 2026-01-30 | 1,702,614 | +4.5% | 562,602 | 3.03 |
| 2026-01-15 | 1,629,950 | +3.5% | 568,852 | 2.87 |
| 2025-12-31 | 1,574,033 | -7.7% | 529,945 | 2.97 |
| 2025-12-15 | 1,705,424 | +11.8% | 476,230 | 3.58 |
| 2025-11-28 | 1,526,144 | +0.9% | 636,458 | 2.40 |
| 2025-11-14 | 1,512,733 | -20.2% | 779,132 | 1.94 |
| 2025-10-31 | 1,895,266 | -5.5% | 1,141,356 | 1.66 |
| 2025-10-15 | 2,004,537 | -12.7% | 3,244,751 | 1.00 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 13 October 2026, the short share of QMCO volume is 66.5%, up 14.0 points over the last five sessions. Over the last 30 readings it ranged from 35.2% (10 September 2026) to 66.5% (13 October 2026). The latest reading sits at the top of that range. The latest reading is 18.0 points above the 30-session average of 48.5%, on 939K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-13 | 625K | 939K | 66.5% | 20,286 |
| 2026-10-12 | 338K | 815K | 41.4% | 12,893 |
| 2026-10-09 | 181K | 483K | 37.6% | 2 |
| 2026-10-08 | 330K | 744K | 44.4% | 9,055 |
| 2026-10-07 | 235K | 659K | 35.6% | 2,162 |
| 2026-10-06 | 398K | 757K | 52.5% | 1 |
| 2026-10-05 | 498K | 819K | 60.9% | 0 |
| 2026-10-02 | 586K | 1.6M | 37.6% | 929 |
| 2026-10-01 | 488K | 966K | 50.6% | 100 |
| 2026-09-30 | 328K | 667K | 49.3% | 1,093 |
| 2026-09-29 | 528K | 908K | 58.2% | 801 |
| 2026-09-28 | 371K | 683K | 54.4% | 0 |
| 2026-09-25 | 992K | 1.8M | 55.2% | 3,616 |
| 2026-09-24 | 1.3M | 2.6M | 49.1% | 2,222 |
| 2026-09-23 | 898K | 2.0M | 44.6% | 14,813 |
| 2026-09-22 | 198K | 444K | 44.6% | 1,300 |
| 2026-09-21 | 300K | 452K | 66.4% | 400 |
| 2026-09-18 | 156K | 317K | 49.1% | 402 |
| 2026-09-17 | 351K | 689K | 51.0% | 1,041 |
| 2026-09-16 | 150K | 317K | 47.5% | 242 |
| 2026-09-15 | 165K | 325K | 50.7% | 3,083 |
| 2026-09-14 | 211K | 359K | 58.7% | 0 |
| 2026-09-11 | 122K | 245K | 49.8% | 1,416 |
| 2026-09-10 | 108K | 307K | 35.2% | 211 |
| 2026-09-09 | 130K | 288K | 45.0% | 0 |
| 2026-09-08 | 146K | 340K | 43.0% | 0 |
| 2026-09-04 | 231K | 449K | 51.4% | 50 |
| 2026-09-03 | 150K | 362K | 41.3% | 1,000 |
| 2026-09-02 | 149K | 376K | 39.6% | 294 |
| 2026-09-01 | 172K | 389K | 44.2% | 1,224 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 11 September 2026, the fails-to-deliver balance in QMCO is 200 shares, up 193 shares over the last settlement date. Over the last 30 readings it ranged from 7 shares (8 September 2026) to 208,332 shares (5 August 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-11 | 200 | $23.03 | $5K |
| 2026-09-08 | 7 | $24.73 | $173 |
| 2026-08-20 | 352 | $21.79 | $8K |
| 2026-08-12 | 68,098 | $19.40 | $1.3M |
| 2026-08-10 | 7,309 | $12.04 | $88K |
| 2026-08-07 | 4,774 | $11.68 | $56K |
| 2026-08-05 | 208,332 | $11.45 | $2.4M |
| 2026-08-03 | 3,413 | $10.64 | $36K |
| 2026-07-31 | 21,069 | $11.24 | $237K |
| 2026-07-30 | 32,573 | $10.45 | $340K |
| 2026-07-29 | 104,416 | $11.28 | $1.2M |
| 2026-07-28 | 6,661 | $10.97 | $73K |
| 2026-07-27 | 761 | $11.10 | $8K |
| 2026-07-23 | 343 | $11.66 | $4K |
| 2026-07-21 | 8,373 | $10.99 | $92K |
| 2026-07-20 | 3,513 | $10.63 | $37K |
| 2026-07-17 | 245 | $9.60 | $2K |
| 2026-07-16 | 21 | $10.30 | $216 |
| 2026-07-15 | 1,559 | $10.06 | $16K |
| 2026-07-14 | 476 | $9.67 | $5K |
| 2026-07-13 | 300 | $10.02 | $3K |
| 2026-07-10 | 4,059 | $10.40 | $42K |
| 2026-07-09 | 4,548 | $10.60 | $48K |
| 2026-07-06 | 245 | $10.16 | $2K |
| 2026-06-30 | 13,752 | $11.85 | $163K |
| 2026-06-29 | 267 | $11.65 | $3K |
| 2026-06-26 | 4,095 | $12.93 | $53K |
| 2026-06-25 | 1,404 | $13.42 | $19K |
| 2026-06-24 | 1,404 | $13.81 | $19K |
| 2026-06-23 | 2,673 | $14.04 | $38K |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at QMCO reported 1 open-market sell worth $16K in the last 90 days and no open-market buys. Latest filing: Jaworksi Don (Director) on 2026-10-01.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-01 | Jaworksi Don | Director | Grant | 12K | $0.00 | $0 | 52K |
| 2026-10-01 | FICHTHORN JOHN | Director, 10% owner | Grant | 12K | $0.00 | $0 | 41K |
| 2026-10-01 | Clancy James C | Chief Operating Officer | Grant | 150K | $0.00 | $0 | 163K |
| 2026-10-01 | White Yue Zhou | Director | Grant | 12K | $0.00 | $0 | 53K |
| 2026-10-01 | Tracy John R. | Director | Grant | 12K | $0.00 | $0 | 39K |
| 2026-10-01 | Blevins Tony J | Director | Grant | 12K | $0.00 | $0 | 25K |
| 2026-10-01 | Patel Hiral | Chief Accounting Officer | Grant | 50K | $0.00 | $0 | 50K |
| 2026-08-03 | Craythorne Anthony | Chief Revenue Officer | Sell | 1K | $10.73 | $16K | 14K |
| 2026-07-02 | Nash Laura A. | Chief Accounting Officer | Sell | 260 | $10.51 | $3K | 11K |
| 2026-07-02 | Meyrath Hugues | President & CEO | Sell | 6K | $10.51 | $65K | 118K |
| 2026-06-04 | FICHTHORN JOHN | Director, 10% owner | Grant | 3.1M | $5.19 | $16.0M | 14.1M |
| 2026-06-04 | FICHTHORN JOHN | Director, 10% owner | Conversion | 11.0M | $5.19 | $57.2M | 11.0M |
| 2026-06-04 | Dialectic Technology SPV LLC | 10% owner | Grant | 3.1M | $5.19 | $16.0M | 14.1M |
| 2026-06-04 | Dialectic Technology SPV LLC | 10% owner | Conversion | 11.0M | $5.19 | $57.2M | 11.0M |
| 2026-04-02 | Nash Laura A. | Chief Accounting Officer | Sell | 109 | $5.44 | $593 | 11K |
| 2026-03-04 | White William Hillis | Chief Financial Officer | Grant | 25K | $0.00 | $0 | 25K |
| 2026-01-01 | White Yue Zhou | Director | Grant | 12K | $0.00 | $0 | 41K |
| 2026-01-01 | Tracy John R. | Director | Grant | 12K | $0.00 | $0 | 27K |
| 2026-01-01 | Meyrath Hugues | President & CEO | Grant | 63K | $0.00 | $0 | 125K |
| 2026-01-01 | Jaworksi Don | Director | Grant | 12K | $0.00 | $0 | 40K |
| 2026-01-01 | FICHTHORN JOHN | Director, 10% owner | Grant | 12K | $0.00 | $0 | 27K |
| 2026-01-01 | Craythorne Anthony | Chief Revenue Officer | Grant | 15K | $0.00 | $0 | 15K |
| 2026-01-01 | Clancy James C | Director | Grant | 12K | $0.00 | $0 | 13K |
| 2026-01-01 | Blevins Tony J | Director | Grant | 12K | $0.00 | $0 | 13K |
| 2025-11-01 | Meyrath Hugues | President & CEO | Grant | 38K | $0.00 | $0 | 62K |
| 2025-11-01 | Clancy James C | Director | Grant | 1K | $0.00 | $0 | 1K |
| 2025-11-01 | Blevins Tony J | Director | Grant | 1K | $0.00 | $0 | 1K |
| 2025-10-02 | Nash Laura A. | Chief Accounting Officer | Sell | 611 | $10.86 | $7K | 11K |
| 2025-10-02 | Meyrath Hugues | President & CEO | Sell | 3K | $10.86 | $32K | 25K |
| 2025-10-01 | Nash Laura A. | Chief Accounting Officer | Sell | 118 | $9.91 | $1K | 12K |
| 2025-10-01 | Nash Laura A. | Chief Accounting Officer | Grant | 500 | $0.00 | $0 | 12K |
| 2025-09-12 | Nash Laura A. | Chief Accounting Officer | Sell | 284 | $7.40 | $2K | 11K |
| 2025-05-01 | FICHTHORN JOHN | Director | Grant | 4K | $0.00 | $0 | 15K |
| 2025-04-21 | Cabrera Brian E | SVP Chief Admin Ofcr & Secy | Grant | 2K | $0.00 | $0 | 30K |
| 2025-04-21 | Cabrera Brian E | SVP Chief Admin Ofcr & Secy | Sell | 1K | $9.65 | $10K | 29K |
| 2025-04-21 | Lerner James J | President & CEO | Grant | 6K | $0.00 | $0 | 114K |
| 2025-04-21 | Lerner James J | President & CEO | Sell | 3K | $9.65 | $27K | 111K |
| 2025-04-21 | Moorehead Lewis W. | Chief Accounting Officer | Grant | 333 | $0.00 | $0 | 25K |
| 2025-04-21 | Moorehead Lewis W. | Chief Accounting Officer | Sell | 179 | $9.65 | $2K | 25K |
| 2025-04-15 | PACIFIC INVESTMENT MANAGEMENT CO LLC | TenPercentOwner | Sell | 962K | $10.25 | $9.9M | 0 |
| 2025-04-02 | Nash Laura A. | Chief Accounting Officer | Sell | 136 | $12.85 | $2K | 12K |
| 2025-02-03 | Gianella Kenneth P. | Chief Financial Officer | Sell | 1K | $21.53 | $28K | 32K |
| 2025-01-16 | Cabrera Brian E | SVP Chief Admin Ofcr & Secy | Sell | 2K | $35.68 | $71K | 28K |
| 2025-01-16 | Gianella Kenneth P. | Chief Financial Officer | Sell | 1K | $35.68 | $53K | 34K |
| 2025-01-16 | Spanjaard Henk Jan | Chief Revenue Officer | Sell | 935 | $35.68 | $33K | 15K |
| 2025-01-16 | Lerner James J | President & CEO | Sell | 3K | $35.68 | $90K | 108K |
| 2025-01-03 | PACIFIC INVESTMENT MANAGEMENT CO LLC | TenPercentOwner | X | 114K | $54.20 | $6.2M | 627K |
| 2025-01-03 | PACIFIC INVESTMENT MANAGEMENT CO LLC | TenPercentOwner | X | 220K | $26.00 | $5.7M | 746K |
| 2025-01-03 | PACIFIC INVESTMENT MANAGEMENT CO LLC | TenPercentOwner | Sell | 93K | $61.52 | $5.7M | 653K |
| 2025-01-03 | PACIFIC INVESTMENT MANAGEMENT CO LLC | TenPercentOwner | X | 63K | $6.20 | $393K | 716K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON10 holders report 5% or more of QMCO in their latest filing, 3 on Schedule 13D (active intent). The largest reported stake is Dialectic Technology SPV LLC at 40.0% of the class (16,863,839 shares), filed 2026-06-08 for an event on 2026-06-04.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G | Alyeska Fund GP, LLCother entity | 2.7M | 6.7% | 2026-06-30 |
| 2026-08-14 | 13G | Anand Parekhindividual | 2.7M | 6.7% | 2026-06-30 |
| 2026-08-14 | 13G | Alyeska Investment Group, L.P.investment adviser | 2.7M | 6.7% | 2026-06-30 |
| 2026-08-14 | 13G | Two Seas Capital LPinvestment adviser, partnership | 2.5M | 6.3% | 2026-06-30 |
| 2026-08-14 | 13G | Two Seas Capital GP LLCother entity, parent holding company | 2.5M | 6.3% | 2026-06-30 |
| 2026-08-14 | 13G | Sina Toussiindividual, parent holding company | 2.5M | 6.3% | 2026-06-30 |
| 2026-08-10 | 13G | Oaktree Capital Management LPpartnership | 2.0M | 5.1% | 2026-06-30 |
| 2026-06-08 | 13D/Ano. 3 | Dialectic Technology SPV LLCinvestment company | 16.9M | 40.0% | 2026-06-04 |
| 2026-06-08 | 13D/Ano. 3 | JOHN FICHTHORNemployee benefit plan, individual, parent holding company | 16.9M | 40.0% | 2026-06-04 |
| 2026-06-08 | 13D/Ano. 3 | Dialectic Technology Manager LLCinvestment company | 16.9M | 40.0% | 2026-06-04 |
13F holders
Tracked managers holding QMCO at their latest 13F. JSON2 of the 30 tracked managers held QMCO at their latest 13F, $1.9M in total at quarter-end prices. Renaissance Technologies is the largest at $1.7M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 0 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Renaissance Technologies | 2026-06-30 | 155K | $1.7M | 0.00% | new |
| Millennium Management | 2026-06-30 | 22K | $239K | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
What this page is
Quantum in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Quantum (QMCO), SEC CIK 709283, listed on Nasdaq, classified by the SEC as computer storage devices. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-13.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-11.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-14.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2025-08-18.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-01.JSON and CSV
- Company record
- EDGAR filing index for CIK 709283Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
Other companies the SEC classifies as computer storage devices
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Frequently Asked Questions
How much of QMCO is sold short?
What is QMCO's daily short volume?
Does QMCO have fails to deliver?
Are QMCO insiders buying or selling?
Who owns 5% or more of QMCO?
Which tracked 13F managers own QMCO?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.