List of insiders holdings for QUANTUM CORP /DE/:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | FICHTHORN JOHN Director 10% Owner | 2026-06-08 21:54:36 | 28,896 14,210,531 | 14,239,427 | Form 4 |
| 2 | Dialectic Technology SPV LLC 10% Owner | 2026-06-08 21:21:36 | 14,210,531 0 | 14,210,531 | Form 4 |
| 3 | SOROS FUND MANAGEMENT LLC SOROS GEORGE SOROS ROBERT 10% Owner | 2017-02-14 16:18:45 | 10,666,666 0 | 10,666,666 | Form 13G |
| 4 | B. Riley Financial Inc. B. Riley Securities Inc. RILEY BRYANT R 10% Owner | 2022-08-08 17:15:07 | 5,025,471 0 | 5,025,471 | Form 13D |
| 5 | B. Riley Financial Inc. B. RILEY CAPITAL MANAGEMENT LLC BRC Partners Management GP LLC BRC Partners Opportunity Fund LP B. Riley Securities Inc. RILEY BRYANT R 10% Owner | 2022-08-08 17:15:07 | 5,025,471 0 | 5,025,471 | Form 13D |
| 6 | B. Riley Financial Inc. BRC Partners Opportunity Fund LP BRC Partners Management GP LLC B. RILEY CAPITAL MANAGEMENT LLC B. RILEY FBR INC. 10% Owner | 2022-08-08 17:15:07 | 5,025,471 0 | 5,025,471 | Form 13D |
| 7 | Matthews Howard L President & COO | 2006-08-24 15:49:03 | 3,360,000 0 | 3,360,000 | Form 4 |
| 8 | Singer Eric VIEX Opportunities Fund LP Series One VIEX Opportunities Fund LP - Series Two VIEX Special Opportunities Fund III LP VIEX GP LLC VIEX Special Opportunities GP III LLC VIEX Capital Advisors LLC See Explanation of Responses 10% Owner | 2020-03-11 17:25:21 | 1,957,275 0 | 1,957,275 | Form 13D |
| 9 | Smith Jeffrey C MITCHELL MARK R Feld Peter A See Footnote 2 10% Owner | 2016-12-07 18:17:47 | 0 1,500,174 | 1,500,174 | Form 4 |
| 10 | Hayes Edward J Jr CFO & Executive VP | 2006-08-24 17:05:09 | 1,132,292 0 | 1,132,292 | Form 4 |
| 11 | Starboard Value LP Starboard Value GP LLC STARBOARD VALUE & OPPORTUNITY S LLC Starboard Principal Co LP Starboard Principal Co GP LLC STARBOARD VALUE & OPPORTUNITY MASTER FUND LTD Starboard Value & Opportunity C LP Starboard Value R LP Starboard Value R GP LLC See Footnote 2 10% Owner | 2017-11-15 17:23:42 | 957,067 0 | 957,067 | Form 13D |
| 12 | Powers Gregg J Director | 2017-04-03 17:23:06 | 586,500 345,392 | 931,892 | Form 4 |
| 13 | Breard Linda M. Chief Financial Officer | 2015-07-02 18:48:29 | 916,761 0 | 916,761 | Form 4 |
| 14 | DODSON J MICHAEL Senior Vice President, CFO | 2022-10-07 14:55:38 | 870,372 0 | 870,372 | Form 4 |
| 15 | Meyrath Hugues President & CEO | 2026-04-03 16:15:08 | 850,000 0 | 850,000 | Form 4 |
| 16 | CARROZZA ANTHONY Senior VP, Worldwide Sales | 2006-08-24 18:08:31 | 844,413 0 | 844,413 | Form 4 |
| 17 | Wold Jim SVP, RSA | 2007-04-09 16:12:05 | 725,436 0 | 725,436 | Form 3 |
| 18 | Stinson Theodore A. SVP, Worldwide Sales | 2013-07-02 16:49:42 | 714,743 0 | 714,743 | Form 4 |
| 19 | PARKER JESSE SVP, Operations | 2007-04-09 16:11:40 | 662,124 0 | 662,124 | Form 3 |
| 20 | RITTI PHILIP VP, General Manager, Media | 2006-08-24 19:16:57 | 595,244 0 | 595,244 | Form 4 |
| 21 | Lee Janae S. SVP, Strategy | 2015-07-02 18:51:41 | 525,520 0 | 525,520 | Form 4 |
| 22 | BELLUZZO RICHARD Director | 2012-08-16 19:45:54 | 484,072 0 | 484,072 | Form 4 |
| 23 | WHEELWRIGHT STEVEN Director | 2006-08-30 14:19:52 | 438,567 0 | 438,567 | Form 4 |
| 24 | ROBERSON DAVID EARLE Director | 2017-04-03 16:06:53 | 431,784 0 | 431,784 | Form 4 |
| 25 | GACEK JON W President and CEO | 2017-10-02 19:27:35 | 407,207 0 | 407,207 | Form 4 |
| 26 | KRALL DAVID Director | 2017-03-06 12:56:14 | 394,875 0 | 394,875 | Form 4 |
| 27 | Dennis Patrick President and CEO | 2018-02-02 15:03:47 | 375,000 0 | 375,000 | Form 4 |
| 28 | Hurley John Chief Revenue Officer | 2023-09-06 16:24:32 | 341,519 0 | 341,519 | Form 4 |
| 29 | BROWN MICHAEL A Director | 2013-09-04 16:35:34 | 326,312 0 | 326,312 | Form 4 |
| 30 | Willis Christopher Shawn Interim CFO | 2016-02-08 17:24:13 | 304,777 0 | 304,777 | Form 4 |
| 31 | Rothman Marc E Director | 2022-09-06 16:44:04 | 297,625 0 | 297,625 | Form 4 |
| 32 | DINARDO LOUIS Director | 2017-03-06 20:51:41 | 285,392 0 | 285,392 | Form 4 |
| 33 | King Elizabeth Chief Revenue Officer | 2021-07-08 15:23:44 | 285,114 0 | 285,114 | Form 4 |
| 34 | Black Philip Director | 2015-09-02 16:38:02 | 265,392 0 | 265,392 | Form 4 |
| 35 | FULLER DALE L Director | 2017-03-03 18:53:37 | 263,890 0 | 263,890 | Form 4 |
| 36 | RAU RAGHAVENDRA Director | 2022-04-26 19:58:11 | 257,874 0 | 257,874 | Form 4 |
| 37 | ORECKLIN LAWRENCE President - SSG | 2004-04-15 14:29:55 | 250,000 0 | 250,000 | Form 5 |
| 38 | BRITTS WILLIAM C SVP, Worldwide Sales & Mktg. | 2018-02-07 14:57:10 | 207,271 0 | 207,271 | Form 4 |
| 39 | Buchsbaum Thomas S Director | 2012-09-05 15:25:57 | 201,393 0 | 201,393 | Form 4 |
| 40 | BARRETT BARBARA Senior VP, Human Resources | 2010-07-01 19:55:21 | 199,422 0 | 199,422 | Form 4 |
| 41 | MARENGI JOSEPH A Director | 2012-09-05 15:27:02 | 191,354 0 | 191,354 | Form 4 |
| 42 | FETTER ELIZABETH A Director | 2012-09-05 15:25:41 | 188,392 0 | 188,392 | Form 4 |
| 43 | PARTRIDGE JOHN Director | 2006-08-30 14:11:57 | 184,937 0 | 184,937 | Form 4 |
| 44 | LAMBERT MICHAEL Chief Financial Officer | 2004-02-23 16:54:28 | 175,000 0 | 175,000 | Form 4 |
| 45 | Ahmad Fuad SVP, Chief Financial Officer | 2018-04-03 12:30:37 | 170,998 0 | 170,998 | Form 4 |
| 46 | Jacoby Rebecca Director | 2022-09-06 16:50:18 | 158,624 0 | 158,624 | Form 4 |
| 47 | Craythorne Anthony Chief Revenue Officer | 2026-04-03 16:15:10 | 148,500 0 | 148,500 | Form 4 |
| 48 | WOLF DENNIS P Director | 2011-09-02 17:22:52 | 138,776 0 | 138,776 | Form 4 |
| 49 | LOPATIN GERALD Executive VP, Engineering | 2010-07-01 19:57:15 | 129,567 0 | 129,567 | Form 4 |
| 50 | HALL SHAWN D Senior VP, GC & Secretary | 2019-03-12 17:34:44 | 119,999 0 | 119,999 | Form 4 |
| 51 | Press Clifford Director | 2019-09-09 18:22:14 | 118,940 0 | 118,940 | Form 4 |
| 52 | Lerner James J President & CEO | 2025-04-23 17:14:18 | 110,848 0 | 110,848 | Form 4 |
| 53 | MacPherson Regan J Chief Legal&Compliance Officer | 2021-03-15 17:11:56 | 107,964 0 | 107,964 | Form 4 |
| 54 | Auvil Paul R. III Director | 2017-09-05 16:46:10 | 101,735 0 | 101,735 | Form 4 |
| 55 | Stedman Geoff G. SVP, Mktg. & Storage Solutions | 2018-02-07 15:04:23 | 101,086 0 | 101,086 | Form 4 |
| 56 | FRAUENFELDER LEWIS GM Storage Devices | 2005-02-04 21:40:06 | 92,373 0 | 92,373 | Form 4 |
| 57 | ESBER EDWARD M Director | 2011-04-07 17:06:05 | 92,135 0 | 92,135 | Form 4 |
| 58 | Andersen Robert J Director | 2015-09-02 16:36:08 | 87,290 0 | 87,290 | Form 4 |
| 59 | SANCHEZ ADALIO T Director | 2019-03-12 17:35:25 | 84,072 0 | 84,072 | Form 4 |
| 60 | Martella Donald E. Jr. SVP, Engineering | 2020-08-26 16:23:40 | 81,407 0 | 81,407 | Form 4 |
| 61 | Clark Robert S. SVP, Product Operations | 2017-07-11 16:56:42 | 74,703 0 | 74,703 | Form 4 |
| 62 | Panayides Andy VP Corp Development & Strategy | 2007-02-08 14:48:33 | 67,971 0 | 67,971 | Form 4 |
| 63 | Pasternack Bruce A Director | 2009-09-02 18:03:57 | 66,000 0 | 66,000 | Form 4 |
| 64 | Wilderotter Mary Agnes Director | 2005-09-28 19:39:27 | 63,750 0 | 63,750 | Form 4 |
| 65 | Nash Laura A. Chief Accounting Officer | 2026-04-03 16:15:38 | 60,530 0 | 60,530 | Form 4 |
| 66 | GANNON JOHN B President & COO | 2005-03-24 19:26:33 | 60,243 0 | 60,243 | Form 4 |
| 67 | MUTCH JOHN Director | 2017-04-03 16:13:30 | 50,000 0 | 50,000 | Form 4 |
| 68 | White Yue Zhou Director | 2026-01-05 19:27:15 | 41,139 0 | 41,139 | Form 4 |
| 69 | KREIGLER GEORGE III GM, Storage Systems | 2005-05-02 17:30:05 | 39,761 0 | 39,761 | Form 4 |
| 70 | Jaworksi Don Director | 2026-01-05 19:24:14 | 39,675 0 | 39,675 | Form 4 |
| 71 | Gianella Kenneth P. Chief Financial Officer | 2025-02-05 16:48:16 | 32,402 0 | 32,402 | Form 4 |
| 72 | Cabrera Brian E SVP Chief Admin Ofcr & Secy | 2025-04-23 17:14:07 | 28,736 0 | 28,736 | Form 4 |
| 73 | Tracy John R. Director | 2026-01-05 19:21:52 | 27,000 0 | 27,000 | Form 4 |
| 74 | EARHART ALAN L Director | 2007-08-30 16:24:22 | 26,809 0 | 26,809 | Form 4 |
| 75 | MAURER JERALD L Exec VP-Human Resources | 2004-04-15 14:15:04 | 26,374 0 | 26,374 | Form 5 |
| 76 | White William Hillis Chief Financial Officer | 2026-03-04 16:06:22 | 25,000 0 | 25,000 | Form 4 |
| 77 | Moorehead Lewis W. Chief Accounting Officer | 2025-04-23 17:14:29 | 24,971 0 | 24,971 | Form 4 |
| 78 | Dalton Stephen P SVP, TSS, Engineering | 2007-11-01 18:45:32 | 23,739 0 | 23,739 | Form 4 |
| 79 | Pinchev Alex Director | 2017-09-05 16:49:07 | 20,344 0 | 20,344 | Form 4 |
| 80 | SANDERSON EDWARD J Director | 2004-09-29 17:23:35 | 18,750 0 | 18,750 | Form 4 |
| 81 | Spanjaard Henk Jan Chief Revenue Officer | 2025-01-17 21:35:35 | 14,903 0 | 14,903 | Form 4 |
| 82 | Blevins Tony J Director | 2026-01-05 19:25:16 | 13,000 0 | 13,000 | Form 4 |
| 83 | Clancy James C Director | 2026-01-05 19:25:55 | 13,000 0 | 13,000 | Form 4 |
| 84 | BROWN DAVID A Director | 2004-03-18 13:46:46 | 3,063 0 | 3,063 | Form 4 |
| 85 | SLAYTON GREGORY W Director | 2004-03-18 15:12:48 | 2,599 0 | 2,599 | Form 4 |
| 86 | KENNEDY KEVIN J Director | 2004-11-02 15:18:04 | 1,763 0 | 1,763 | Form 4 |
| 87 | NELSON BARBARA H Exec VP-Mktg & Strategy | 2004-04-15 14:21:55 | 1,374 0 | 1,374 | Form 5 |
| 88 | CROWELL CHRISTOPHER See Explanation of Responses 10% Owner | 2014-05-19 21:36:17 | 0 0 | 0 | Form 3 |
| 89 | PACIFIC INVESTMENT MANAGEMENT CO LLC 10% Owner | 2025-04-17 16:05:03 | 0 0 | 0 | Form 4 |
| 90 | Arden Todd Director | 2024-06-17 17:11:16 | 0 0 | 0 | Form 3 |
| 91 | Neumeyer Christopher D. Director | 2022-08-29 21:12:30 | 0 0 | 0 | Form 3 |
| 92 | TERINO EDWARD See Explanation of Responses 10% Owner | 2014-05-19 21:33:43 | 0 0 | 0 | Form 3 |
| 93 | BR Dialectic Capital Management LLC Dialectic Antithesis Partners LP 10% Owner | 2019-12-05 17:14:57 | 0 0 | 0 | Form 4 |