Quantum Corporation has 7 Schedule 13D or 13G filings on record since 2025-10-10. 4 holders' latest filing reports 5% or more of common stock, $0.01 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Dialectic Technology SPV LLC | 40% | 16,863,839 | SCHEDULE 13D/A, 2026-06-08 | 2026-06-04 |
| Alyeska Investment Group, L.P. | 6.74% | 2,653,928 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| Two Seas Capital LP | 6.3% | 2,488,535 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| Oaktree Capital Management LP | 5.11% | 2,011,678 | SCHEDULE 13G, 2026-08-10 | 2026-06-30 |
Purpose of Transaction (Item 4)
Dialectic Technology SPV LLC
Item 4 of the Amended Statement is hereby amended by adding the following paragraphs to the end of Item 4: Entry into Conversion Agreement On June 4, 2026 (the "Closing"), the Company issued and sold to certain accredited investors in a private placement (the "Private Placement"), an aggregate of 10,615,712 shares of Common Stock. In order to facilitate, among other things, the Private Placement, Dialectic, as the sole beneficial owner of the Convertible Notes issued under the Indenture, agreed to voluntarily convert the Convertible Notes into Common Stock. Pursuant to a Conversion Agreement dated June 1, 2026 (the "Conversion Agreement"), by and among the Company, Dialectic and, solely with respect to Sections 7.1 and 7.3 and Articles III and X thereof, U.S. Bank Trust Company, National Association, as the trustee and Notes Collateral Agent under the Indenture, Dialectic converted the entire principal amount of the Convertible Notes, together with all accrued and unpaid interest thereon at the Closing, subject to certain conditions set forth in the Conversion Agreement (the "Conversion"). At the Closing, the Convertible Notes were canceled in accordance with the Indenture, and the Indenture was satisfied and discharged. In connection with the Conversion, at the Closing, the Company issued to Dialectic 11,020,645 shares of Common Stock. At the Closing, as consideration for Dialectic's agreement to voluntarily convert the Convertible Notes, the Company issued to …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-06-08; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-10-10 | Dialectic Technology SPV LLC | 16.7% | SCHEDULE 13D |
| 2025-12-22 | Dialectic Technology SPV LLC | 37.3% | SCHEDULE 13D/A |
| 2026-01-12 | Dialectic Technology SPV LLC | 41.4% | SCHEDULE 13D/A |
| 2026-06-08 | Dialectic Technology SPV LLC | 40% | SCHEDULE 13D/A |
| 2026-08-10 | Oaktree Capital Management LP | 5.11% | SCHEDULE 13G |
| 2026-08-14 | Two Seas Capital LP | 6.3% | SCHEDULE 13G |
| 2026-08-14 | Alyeska Investment Group, L.P. | 6.74% | SCHEDULE 13G |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.