List of insiders holdings for GT Biopharma Inc.:
- 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 | Saloff David CEO, Chairman of the Board | 2012-05-30 16:58:12 | 27,650,684 0 | 27,650,684 | Form 4 |
| 2 | Clarence-Smith Kathleen CEO 10% Owner | 2017-12-01 17:25:39 | 8,505,633 0 | 8,505,633 | Form 3 |
| 3 | Silverman Mark J 10% Owner | 2017-12-01 19:29:24 | 8,172,079 0 | 8,172,079 | Form 13G |
| 4 | Cataldo Tony CEO 10% Owner | 2020-06-04 17:15:28 | 6,500,000 0 | 6,500,000 | Form 4 |
| 5 | Weldon Steven W Former Officer and Director Director | 2020-12-23 16:24:42 | 3,720,000 0 | 3,720,000 | Form 4 |
| 6 | Theorem Group LLC 10% Owner | 2017-11-14 10:15:23 | 3,540,130 0 | 3,540,130 | Form 13G |
| 7 | HAUSMAN MARVIN S MD President & CEO | 2008-02-08 12:44:25 | 2,344,080 0 | 2,344,080 | Form 5 |
| 8 | Landes Bernard President | 2010-03-22 19:39:47 | 2,220,453 0 | 2,220,453 | Form 3 |
| 9 | ROGERS RAY R CEO/Chairman of the Board | 2003-12-11 15:10:19 | 1,827,988 0 | 1,827,988 | Form 4/A |
| 10 | Urbanski Raymond W. CEO | 2019-03-19 14:38:04 | 1,351,918 0 | 1,351,918 | Form 4 |
| 11 | Guillen Steven T President & CEO | 2005-12-30 17:18:50 | 1,100,000 0 | 1,100,000 | Form 4 |
| 12 | Post Gary M Former Director and Secretary | 2010-09-02 18:05:28 | 900,000 0 | 900,000 | Form 4 |
| 13 | ELLIS SHARON Chief Operational & Financial | 2003-12-11 19:30:58 | 885,000 0 | 885,000 | Form 4 |
| 14 | Ohri Manu CFO & Secretary | 2023-08-15 19:26:31 | 200,000 550,000 | 750,000 | Form 4 |
| 15 | SHROTRIYA RAJESH C MD Director | 2023-02-01 06:02:39 | 500,000 0 | 500,000 | Form 4 |
| 16 | Wendel Bruce Director | 2023-02-01 06:01:27 | 500,000 0 | 500,000 | Form 4 |
| 17 | REPINE JOHN E Director | 2007-11-13 14:48:31 | 482,187 0 | 482,187 | Form 4 |
| 18 | RODELL TIMOTHY C JR Director | 2005-12-30 17:24:28 | 455,237 0 | 455,237 | Form 4 |
| 19 | WOLF THOMAS M Director | 2003-12-30 12:03:21 | 433,626 0 | 433,626 | Form 4 |
| 20 | NEILL SYDNEY COLIN Director | 2007-11-13 14:31:02 | 432,500 0 | 432,500 | Form 4 |
| 21 | Breen Michael Martin CEO and Director | 2025-09-08 17:45:43 | 300,000 0 | 300,000 | Form 4 |
| 22 | Eaton Kenneth Haynes Director | 2011-07-07 19:20:21 | 250,000 0 | 250,000 | Form 3 |
| 23 | DUBE ANSHUMAN Director | 2011-05-24 19:50:44 | 0 250,000 | 250,000 | Form 4 |
| 24 | HOOG THOMAS W Director | 2011-02-08 15:46:30 | 250,000 0 | 250,000 | Form 3 |
| 25 | Handelman Michael D Chief Financial Officer | 2010-03-22 19:52:13 | 250,000 0 | 250,000 | Form 3 |
| 26 | CENTRON MICHAEL D VP & CFO | 2006-08-02 19:02:01 | 250,000 0 | 250,000 | Form 4 |
| 27 | Choy Gavin Acting Chief Financial Officer | 2022-02-14 16:09:22 | 227,500 0 | 227,500 | Form 4 |
| 28 | BRISTOL INVESTMENT FUND LTD BRISTOL CAPITAL LLC 10% Owner | 2025-06-02 19:46:09 | 150,000 0 | 150,000 | Form 13G |
| 29 | BRISTOL INVESTMENT FUND LTD 10% Owner | 2025-06-02 19:46:09 | 150,000 0 | 150,000 | Form 13G |
| 30 | BRUINSMA GOSSE B Chairman, Acting CEO | 2004-10-13 17:46:27 | 135,000 0 | 135,000 | Form 4 |
| 31 | DAVIS RICHARD A Director | 2004-06-30 11:48:00 | 107,147 0 | 107,147 | Form 4/A |
| 32 | ODonnell Manus H Acting Chief Operating Officer | 2004-12-27 16:37:45 | 100,000 0 | 100,000 | Form 4 |
| 33 | URBAN ALAN LOUIS Chief Financial Officer | 2025-09-08 17:45:41 | 100,000 0 | 100,000 | Form 4 |
| 34 | PRYOR WILLIAM G Director | 2003-12-08 21:30:58 | 87,602 0 | 87,602 | Form 4 |
| 35 | FERRIS STEVEN H Director | 2004-10-13 17:45:32 | 85,000 0 | 85,000 | Form 4 |
| 36 | VLAK GERARD J M Director | 2004-10-13 17:44:01 | 85,000 0 | 85,000 | Form 4 |
| 37 | CASAMENTO CHARLES J Director | 2025-09-08 17:45:40 | 62,500 0 | 62,500 | Form 4 |
| 38 | Berk Gregory Pres. of R&D, CMO | 2022-07-19 21:44:55 | 50,000 0 | 50,000 | Form 4 |
| 39 | SPOLAR MATTHEW R Director | 2007-11-13 14:36:37 | 35,000 0 | 35,000 | Form 4 |
| 40 | WEBB TED FORD Director | 2003-12-09 15:07:03 | 31,754 0 | 31,754 | Form 4/A |
| 41 | Kramer Hilary Director | 2025-09-08 17:45:38 | 31,250 0 | 31,250 | Form 4 |
| 42 | Mun-Gavin David C. Director | 2025-09-08 17:45:44 | 31,250 0 | 31,250 | Form 4 |
| 43 | Ritter Andrew J Director | 2025-05-29 16:15:10 | 0 0 | 0 | Form 3 |
| 44 | Cross Shawn Chief Executive Officer | 2018-03-16 17:14:20 | 0 0 | 0 | Form 3 |
| 45 | AXONYX INC HAUSMAN MARVIN S MD 10% Owner | 2008-10-03 20:29:42 | 0 0 | 0 | Form 13D |