OSS (One Stop Systems, Inc. Common Stock)
Insider Trading Activity
Every open-market purchase and sale reported by OSS officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-04 | Daniel G. Gabel | Chief Financial Officer | F | — | — |
| 2026-09-04 | MICHAEL KNOWLES | Chief Executive Officer | F | — | — |
| 2026-06-12 | MICHAEL KNOWLES | Chief Executive Officer | F | — | — |
| 2026-05-28 | Daniel G. Gabel | Chief Financial Officer | F | — | — |
| 2026-05-26 | DAVID GEORGE BASSETT | Director | MIXED | — | — |
| 2026-05-26 | Gregory W Matz | Director | MIXED | — | — |
| 2026-05-26 | Michael J. Dumont | Director | A | — | — |
| 2026-05-26 | Mitchell H Herbets | Director | MIXED | — | — |
| 2026-03-27 | MICHAEL KNOWLES | Chief Executive Officer | A | — | — |
| 2026-03-02 | MICHAEL KNOWLES | Chief Executive Officer | F | — | — |
| 2026-03-02 | James Ison | CPO | MIXED | — | — |
| 2026-03-02 | Daniel G. Gabel | Chief Financial Officer | F | — | — |
| 2026-02-11 | Daniel G. Gabel | Chief Financial Officer | A | — | — |
| 2026-02-11 | MICHAEL KNOWLES | Chief Executive Officer | A | — | — |
| 2026-01-12 | Daniel G. Gabel | Chief Financial Officer | F | — | — |
| 2026-01-07 | MICHAEL KNOWLES | Chief Executive Officer | F | — | — |
| 2025-09-02 | MICHAEL KNOWLES | Chief Executive Officer | MIXED | — | — |
| 2025-08-25 | James Ison | CPO | MIXED | — | — |
| 2025-05-28 | Mitchell H Herbets | Director | A | — | — |
| 2025-05-27 | Michael J. Dumont | Director | F | — | — |
| 2025-05-23 | Gregory W Matz | Director | A | — | — |
| 2025-03-13 | James Ison | CPO | MIXED | — | — |
| 2025-03-05 | Daniel G. Gabel | Chief Financial Officer | A | — | — |
| 2025-02-24 | James Ison | CPO | A | — | — |
| 2024-12-30 | MICHAEL KNOWLES | Chief Executive Officer | F | — | — |
| 2024-11-12 | Daniel G. Gabel | Chief Financial Officer | A | — | — |
| 2024-09-25 | John W Morrison Jr. | Chief Financial Officer | F | — | — |
| 2024-09-25 | James Ison | CPO | MIXED | — | — |
| 2024-08-21 | John W Morrison Jr. | Chief Financial Officer | F | — | — |
| 2024-08-21 | James Ison | CPO | MIXED | — | — |
| 2024-08-15 | Joseph M. Manko Jr. | Director | Buy | — | — |
| 2024-07-11 | KENNETH F POTASHNER | Director | M | — | — |
| 2024-07-03 | KENNETH F POTASHNER | Director | A | — | — |
| 2024-07-03 | Michael J. Dumont | Director | A | — | — |
| 2024-07-03 | James Ison | CPO | A | — | — |
| 2024-07-03 | John W Morrison Jr. | Chief Financial Officer | A | — | — |
| 2024-07-03 | Mitchell H Herbets | Director | A | — | — |
| 2024-07-03 | Gioia Messinger | Director | A | — | — |
| 2024-07-03 | Gregory W Matz | Director | A | — | — |
| 2024-07-03 | MICHAEL KNOWLES | Chief Executive Officer | A | — | — |
| 2024-07-03 | Joseph M. Manko Jr. | Director | A | — | — |
| 2024-06-18 | MICHAEL KNOWLES | Chief Executive Officer | F | — | — |
| 2024-05-28 | John W Morrison Jr. | Chief Financial Officer | F | — | — |
| 2024-05-28 | James Ison | CPO | MIXED | — | — |
| 2024-04-03 | KENNETH F POTASHNER | Director | M | — | — |
| 2024-04-03 | DAVID RAUN | Director | M | — | — |
| 2024-03-27 | John W Morrison Jr. | Chief Financial Officer | F | — | — |
| 2024-03-27 | James Ison | CPO | MIXED | — | — |
| 2024-02-07 | John W Morrison Jr. | Chief Financial Officer | F | — | — |
| 2024-02-07 | James Ison | CPO | MIXED | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 4,854,593 | — |
| — | 10%+ Owner | 2,988,113 | — |
| — | Director | 1,271,249 | — |
| — | Director | 1,195,899 | — |
| — | VP of Sales | 1,079,312 | — |
| — | Chief Executive Officer | 590,141 | — |
| — | President and CEO | 425,597 | — |
| — | Director | 398,601 | — |
| — | CPO | 367,962 | — |
| — | Chief Financial Officer | 305,381 | — |
| — | Managing Director, Bressner | 216,260 | — |
| — | Director | 206,682 | — |
| — | Director | 199,236 | — |
| — | Director | 180,673 | — |
| — | Chief Financial Officer | 150,064 | — |
| — | Director | 92,435 | — |
| — | Director | 89,414 | — |
| — | Director | 49,690 | — |
| — | Director | 48,984 | — |
| — | Director | 39,266 | — |
| — | Director | 29,930 | — |
| — | Director | 24,984 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the OSS quote page; the site-wide leaderboard is on the insider transactions hub.