Insider holders · CIK 0000709283
QUANTUM CORP /DE/ · QMCO
Every insider with a reported Table I holding at this company, ranked by their last-reported share count. A balance is only as fresh as its filing — the report date sits next to every row on purpose. ← Back to activity
| Insider | Direct shares | Indirect shares | Total reported | Last report (ET) | From |
|---|---|---|---|---|---|
| John FichthornDirector | 28,896 | 14,104,620 | 14,133,516 | Jun 8, 2026 · 9:54 pm EDT | Form 4 |
| Dialectic Technology SPV LLC10% Owner | 14,104,620 | — | 14,104,620 | Jun 8, 2026 · 9:21 pm EDT | Form 4 |
| BRC Partners Management GP, LLC10% Owner | — | 3,627,662 | 3,627,662 | Jan 23, 2019 · 6:20 pm EST | Form 4 |
| BR Dialectic Capital Management, LLC10% Owner | — | 3,627,662 | 3,627,662 | Jan 23, 2019 · 6:20 pm EST | Form 4 |
| B. RILEY CAPITAL MANAGEMENT, LLC10% Owner | — | 3,627,662 | 3,627,662 | Jan 23, 2019 · 6:20 pm EST | Form 4 |
| BRC Partners Opportunity Fund, LP10% Owner | — | 3,627,662 | 3,627,662 | Jan 23, 2019 · 6:20 pm EST | Form 4 |
| B. Riley FBR, Inc.10% Owner | — | 3,627,662 | 3,627,662 | Jan 23, 2019 · 6:20 pm EST | Form 4 |
| B. Riley Financial, Inc.10% Owner | — | 3,627,662 | 3,627,662 | Jan 23, 2019 · 6:20 pm EST | Form 4 |
| Dialectic Antithesis Partners, LP10% Owner | — | 3,627,662 | 3,627,662 | Jan 23, 2019 · 6:20 pm EST | Form 4 |
| B. RILEY FBR, INC.10% Owner | — | 3,529,077 | 3,529,077 | Jan 17, 2019 · 6:02 pm EST | Form 4 |
| VIEX Special Opportunities GP III, LLC10% Owner | 16,681 | 2,588,833 | 2,605,514 | Dec 4, 2017 · 4:18 pm EST | Form 4 |
| VIEX Opportunities Fund, LP Series Two10% Owner | 16,681 | 2,588,833 | 2,605,514 | Dec 4, 2017 · 4:18 pm EST | Form 4 |
| VIEX GP, LLC10% Owner | 16,681 | 2,588,833 | 2,605,514 | Dec 4, 2017 · 4:18 pm EST | Form 4 |
| VIEX Special Opportunities Fund III, LP10% Owner | 16,681 | 2,588,833 | 2,605,514 | Dec 4, 2017 · 4:18 pm EST | Form 4 |
| VIEX Capital Advisors, LLC10% Owner | 16,681 | 2,588,833 | 2,605,514 | Dec 4, 2017 · 4:18 pm EST | Form 4 |
| VIEX Opportunities Fund, LP Series One10% Owner | 16,681 | 2,588,833 | 2,605,514 | Dec 4, 2017 · 4:18 pm EST | Form 4 |
| Eric SingerDirector | 16,681 | 2,588,833 | 2,605,514 | Dec 4, 2017 · 4:18 pm EST | Form 4 |
| Starboard Value R GP LLC10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Starboard Value R LP10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Starboard Value & Opportunity C LP10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| STARBOARD VALUE & OPPORTUNITY S LLC10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Starboard Principal Co GP LLC10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Starboard Principal Co LP10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Starboard Value GP LLC10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Starboard Value LP10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Peter A Feld10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:17 pm EST | Form 4 |
| STARBOARD VALUE & OPPORTUNITY MASTER FUND LTD10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:10 pm EST | Form 4 |
| Jeffrey C Smith10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:17 pm EST | Form 4 |
| Mark R Mitchell10% Owner | — | 1,500,174 | 1,500,174 | Dec 7, 2016 · 6:17 pm EST | Form 4 |
| Gregg J PowersDirector | 586,500 | 345,392 | 931,892 | Apr 3, 2017 · 5:23 pm EDT | Form 4 |
| Linda M. BreardChief Financial Officer | 916,761 | — | 916,761 | Jul 2, 2015 · 6:48 pm EDT | Form 4 |
| Janae S. LeeSVP, Strategy | 525,520 | — | 525,520 | Jul 2, 2015 · 6:51 pm EDT | Form 4 |
| David Earle RobersonDirector | 431,784 | — | 431,784 | Apr 3, 2017 · 4:06 pm EDT | Form 4 |
| Jon W GacekPresident and CEO | 407,207 | — | 407,207 | Oct 2, 2017 · 7:27 pm EDT | Form 4 |
| David KrallDirector | 394,875 | — | 394,875 | Mar 6, 2017 · 12:56 pm EST | Form 4 |
| Christopher Shawn WillisInterim CFO | 299,777 | — | 299,777 | Feb 8, 2016 · 5:24 pm EST | Form 4 |
| Louis DinardoDirector | 285,392 | — | 285,392 | Mar 6, 2017 · 8:51 pm EST | Form 4 |
| Philip BlackDirector | 265,392 | — | 265,392 | Sep 2, 2015 · 4:38 pm EDT | Form 4 |
| Dale L FullerDirector | 263,890 | — | 263,890 | Mar 3, 2017 · 6:53 pm EST | Form 4 |
| William C BrittsSVP, Worldwide Sales & Mktg. | 206,646 | — | 206,646 | Feb 7, 2018 · 2:57 pm EST | Form 4 |
| Fuad AhmadSVP, Chief Financial Officer | 170,998 | — | 170,998 | Apr 3, 2018 · 12:30 pm EDT | Form 4 |
| Patrick DennisPresident and CEO | 125,000 | — | 125,000 | Feb 2, 2018 · 3:03 pm EST | Form 4 |
| Shawn D HallSenior VP, GC & Secretary | 119,999 | — | 119,999 | Mar 12, 2019 · 5:34 pm EDT | Form 4 |
| Hugues MeyrathPresident & CEO | 118,468 | — | 118,468 | Jul 7, 2026 · 4:07 pm EDT | Form 4 |
| Donald E. Martella Jr.SVP, ENGINEERING | 114,455 | — | 114,455 | Mar 12, 2019 · 5:34 pm EDT | Form 4 |
| Paul R. Auvil IIIDirector | 101,735 | — | 101,735 | Sep 5, 2017 · 4:46 pm EDT | Form 4 |
| Geoff G. StedmanSVP, Mktg. & Storage Solutions | 100,461 | — | 100,461 | Feb 7, 2018 · 3:04 pm EST | Form 4 |
| Robert J AndersenDirector | 87,290 | — | 87,290 | Sep 2, 2015 · 4:36 pm EDT | Form 4 |
| Raghavendra RauExecutive Chairman | 87,185 | — | 87,185 | Sep 5, 2017 · 4:43 pm EDT | Form 4 |
| Adalio T SanchezDirector | 84,072 | — | 84,072 | Mar 12, 2019 · 5:35 pm EDT | Form 4 |
| Robert S. ClarkSVP, Product Operations | 74,703 | — | 74,703 | Jul 11, 2017 · 4:56 pm EDT | Form 4 |
| John MutchDirector | 50,000 | — | 50,000 | Apr 3, 2017 · 4:13 pm EDT | Form 4 |
| Clifford PressDirector | 48,107 | — | 48,107 | Sep 5, 2017 · 4:52 pm EDT | Form 4 |
| Marc E RothmanDirector | 22,648 | — | 22,648 | Sep 5, 2017 · 4:54 pm EDT | Form 4 |
| Alex PinchevDirector | 20,344 | — | 20,344 | Sep 5, 2017 · 4:49 pm EDT | Form 4 |
| Anthony CraythorneChief Revenue Officer | 13,522 | — | 13,522 | Aug 5, 2026 · 4:10 pm EDT | Form 4 |
| Laura A. NashChief Accounting Officer | 10,770 | — | 10,770 | Jul 7, 2026 · 4:09 pm EDT | Form 4 |
Balances come from each insider’s most recent filing that reports a Table I holding; an insider who left the company years ago still appears with their last-known figure and its date. Indirect totals collapse multiple vehicles (trusts, LLCs) into one number — open the filing for the breakdown. Shares as filed, not split-adjusted.