SEC Form 4 · Updated Daily
OSS
— ONE STOP SYSTEMS, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Cooper Revocable Trust dated April 25, 2001 | 10%+ Owner | 3,062,675 | 2020-08-25 | S |
| Cooper Steve D | 10%+ Owner | 1,923,572 | 2024-01-22 | S |
| JONES RANDY G | Director | 1,271,249 | 2019-04-11 | M |
| Randy Jones & Roseann Piazza Jones Revocable Trust | Reporting Owner | 1,263,749 | 2018-01-31 | — |
| Manko Joseph M. Jr. | Director | 1,174,899 | 2024-08-14 | P |
| Reardon James M | Officer | 1,079,312 | 2021-03-30 | S |
| KNOWLES MICHAEL | Director · Officer | 598,762 | 2026-08-07 | F |
| RAUN DAVID | Director | 425,597 | 2024-04-01 | M |
| POTASHNER KENNETH F | Director | 398,601 | 2024-07-09 | M |
| Morrison John W Jr. | Officer | 305,381 | 2024-09-23 | F |
| Ison James | Officer | 231,148 | 2026-02-15 | G |
| Carpenter William | Director | 199,236 | 2018-03-09 | F |
| Gabel Daniel G. | Officer | 150,064 | 2026-08-07 | F |
| Dumont Michael J. | Director | 119,833 | 2026-05-20 | A |
| Bressner Josef | Officer | 109,797 | 2020-08-27 | M |
| Matz Gregory W | Director | 86,914 | 2026-05-20 | A |
| REARDON JOHN RALPH | Director | 74,370 | 2020-02-12 | M |
| Harrison Jack | Director | 71,984 | 2022-03-17 | A |
| Herbets Mitchell H | Director | 53,984 | 2026-05-20 | A |
| Messinger Gioia | Director | 49,690 | 2024-07-01 | A |
| Sentovich Kimberly C. | Director | 39,266 | 2022-03-17 | A |
| BASSETT DAVID GEORGE | Director | 32,984 | 2026-05-20 | A |
| Lowman Teresita M. | Director | 29,930 | 2022-03-17 | A |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-15 | KNOWLES MICHAEL | Tax withholding | 8,621 | $13.61 | 590,141 |
| 2026-08-07 | Gabel Daniel G. | Tax withholding | 3,832 | $13.32 | 150,064 |
| 2026-08-07 | KNOWLES MICHAEL | Tax withholding | 8,621 | $13.32 | 598,762 |
| 2026-06-05 | KNOWLES MICHAEL | Tax withholding | 19,675 | $16.89 | 607,383 |
| 2026-05-26 | Herbets Mitchell H | Open-market sale | 5,000 | $17.62 | 48,984 |
| 2026-05-26 | Matz Gregory W | Open-market sale | 8,000 | $17.52 | 78,914 |
| 2026-05-26 | BASSETT DAVID GEORGE | Open-market sale | 8,000 | $17.64 | 24,984 |
| 2026-05-20 | Herbets Mitchell H | Grant / award | 11,984 | $0.00 | 53,984 |
| 2026-05-20 | Dumont Michael J. | Grant / award | 11,984 | $0.00 | 119,833 |
| 2026-05-20 | Matz Gregory W | Grant / award | 11,984 | $0.00 | 86,914 |
| 2026-05-20 | BASSETT DAVID GEORGE | Grant / award | 11,984 | $0.00 | 32,984 |
| 2026-05-11 | Gabel Daniel G. | Tax withholding | 1,613 | $15.68 | 153,896 |
| 2026-02-15 | KNOWLES MICHAEL | Tax withholding | 6,650 | $8.70 | 648,058 |
| 2026-02-15 | Ison James | Gift | 4,263 | $0.00 | 231,148 |
| 2026-02-15 | Ison James | Gift | 4,263 | $0.00 | 141,907 |
| 2026-02-15 | Ison James | Tax withholding | 3,120 | $8.70 | 146,170 |
| 2026-02-07 | KNOWLES MICHAEL | Grant / award | 101,862 | $0.00 | 668,006 |
| 2026-02-07 | Gabel Daniel G. | Grant / award | 55,239 | $0.00 | 163,308 |
| 2026-02-07 | KNOWLES MICHAEL | Tax withholding | 13,298 | $9.24 | 654,708 |
| 2026-02-07 | Gabel Daniel G. | Tax withholding | 7,799 | $9.24 | 155,509 |
| 2026-02-07 | Ison James | Gift | 8,213 | $0.00 | 226,885 |
| 2026-02-07 | Ison James | Gift | 8,213 | $0.00 | 141,077 |
| 2026-02-07 | Ison James | Tax withholding | 6,546 | $9.24 | 149,290 |
| 2026-02-07 | Ison James | Grant / award | 34,313 | $0.00 | 155,836 |
| 2025-12-31 | KNOWLES MICHAEL | Tax withholding | 19,075 | $7.18 | 566,144 |
| 2025-12-31 | Gabel Daniel G. | Tax withholding | 3,215 | $7.18 | 108,069 |
| 2025-08-20 | Ison James | Gift | 4,271 | $0.00 | 218,672 |
| 2025-08-20 | Ison James | Gift | 4,271 | $0.00 | 121,523 |
| 2025-08-20 | Ison James | Tax withholding | 3,113 | $5.26 | 125,794 |
| 2025-08-20 | KNOWLES MICHAEL | Tax withholding | 8,359 | $5.26 | 585,219 |
| 2025-06-05 | KNOWLES MICHAEL | Tax withholding | 19,075 | $3.06 | 593,578 |
| 2025-05-21 | Matz Gregory W | Grant / award | 21,000 | $0.00 | 74,930 |
| 2025-05-21 | Dumont Michael J. | Tax withholding | 21,000 | $0.00 | 21,000 |
| 2025-05-21 | Herbets Mitchell H | Grant / award | 21,000 | $0.00 | 42,000 |
| 2025-05-21 | KNOWLES MICHAEL | Grant / award | 21,000 | $0.00 | 612,653 |
| 2025-05-21 | KNOWLES MICHAEL | Grant / award | 0 | $0.00 | 591,653 |
| 2025-05-21 | BASSETT DAVID GEORGE | Grant / award | 21,000 | $0.00 | 21,000 |
| 2025-02-20 | Ison James | Gift | 7,760 | $0.00 | 214,401 |
| 2025-02-20 | Ison James | Gift | 7,760 | $0.00 | 128,907 |
| 2025-02-20 | Ison James | Tax withholding | 7,006 | $3.76 | 136,667 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.