Quantum
QMCO · NASDAQ
$18.99+$0.68 (+3.71%)TodayMarket closed ·
Prev close $18.31
Who owns QMCO
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 66.1% of QMCO’s shares.
- Dialectic Technology SPV, LLC35.8%
- Alyeska Investment Group, L.P.6.7%
- Two Seas Capital LP6.1%
- Oaktree Capital Management, L.P.5.1%
- Next 6 largest institutions12.4%
- All other shareholders33.9%
| Holder | Shares | % of shares |
|---|---|---|
| Dialectic Technology SPV, LLC | 14.10M | 35.80% |
| Alyeska Investment Group, L.P. | 2.65M | 6.74% |
| Two Seas Capital LP | 2.39M | 6.06% |
| Oaktree Capital Management, L.P. | 2.01M | 5.11% |
| Neuberger Berman, LLC | 1.16M | 2.95% |
| Ashford Capital Management, Inc. | 1.04M | 2.64% |
| Portolan Capital Management, L.L.C. | 1.02M | 2.59% |
| Marshall Wace LLP | 713.08K | 1.81% |
| Vanguard Capital Management, LLC | 605.54K | 1.54% |
| Manatuck Hill Partners, LLC | 350.00K | 0.89% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Strategic Advisers US Total Stock Fund | 626.25K | 1.59% |
| Vanguard Total Stock Market Index Fund | 420.70K | 1.07% |
| Vanguard Extended Market Index Fund | 170.89K | 0.43% |
| Mango Growth ETF | 90.57K | 0.23% |
| Florida State Board Administration Fund | 88.56K | 0.22% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $84.09K (3 trades) of QMCO on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Patel Hiral | Award | 50.00K | — |
| Clancy James C | Award | 400.00K | — |
| Clancy James C | Award | 150.00K | — |
| Blevins Tony J | Award | 12.00K | — |
| Craythorne Anthony | Award | 200.00K | — |
| Tracy John R. | Award | 12.00K | — |
| Jaworksi Don | Award | 12.00K | — |
| White Yue Zhou | Award | 12.00K | — |
| Meyrath Hugues | Award | 500.00K | — |
| FICHTHORN JOHN | Award | 12.00K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 3.12M
- Days to cover
- 1.44
- % of shares outstanding
- 7.92%
- Average daily volume
- 2.17M
- Change since last report
- +52.7%
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