OSS · Insider Trading
One Stop Systems, Inc. Common Stock
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-04 | Daniel G. Gabel | Chief Financial Officer | F | −3,832 | −$51.04K |
| 2026-09-04 | Michael Knowles | Chief Executive Officer | F | −17,242 | −$232.16K |
| 2026-06-12 | Michael Knowles | Chief Executive Officer | F | −19,675 | −$332.31K |
| 2026-05-28 | Daniel G. Gabel | Chief Financial Officer | F | −1,613 | −$25.29K |
| 2026-05-26 | David George Bassett | Director | MIXED | +24,984 | −$141.12K |
| 2026-05-26 | Gregory W Matz | Director | MIXED | +3,984 | −$140.16K |
| 2026-05-26 | Michael J. Dumont | Director | A | +11,984 | — |
| 2026-05-26 | Mitchell H Herbets | Director | MIXED | +6,984 | −$88.10K |
| 2026-03-27 | Michael Knowles | Chief Executive Officer | A | — | — |
| 2026-03-02 | Michael Knowles | Chief Executive Officer | F | −19,948 | −$180.73K |
| 2026-03-02 | James Ison | CPO | MIXED | +24,647 | −$87.63K |
| 2026-03-02 | Daniel G. Gabel | Chief Financial Officer | F | −7,799 | −$72.06K |
| 2026-02-11 | Daniel G. Gabel | Chief Financial Officer | A | +55,239 | — |
| 2026-02-11 | Michael Knowles | Chief Executive Officer | A | +101,862 | — |
| 2026-01-12 | Daniel G. Gabel | Chief Financial Officer | F | −3,215 | −$23.08K |
| 2026-01-07 | Michael Knowles | Chief Executive Officer | F | −19,075 | −$136.96K |
| 2025-09-02 | Michael Knowles | Chief Executive Officer | MIXED | +108,214 | +$368.17K |
| 2025-08-25 | James Ison | CPO | MIXED | −3,113 | −$16.37K |
| 2025-05-28 | Mitchell H Herbets | Director | A | +21,000 | — |
| 2025-05-27 | Michael J. Dumont | Director | F | +21,000 | — |
| 2025-05-23 | Gregory W Matz | Director | A | +21,000 | — |
| 2025-03-13 | James Ison | CPO | MIXED | −7,006 | −$26.34K |
| 2025-03-05 | Daniel G. Gabel | Chief Financial Officer | A | +71,284 | +$289.41K |
| 2025-02-24 | James Ison | CPO | A | +44,279 | +$179.77K |
| 2024-12-30 | Michael Knowles | Chief Executive Officer | F | −17,525 | −$42.24K |
| 2024-11-12 | Daniel G. Gabel | Chief Financial Officer | A | +40,000 | — |
| 2024-09-25 | John W Morrison Jr. | Chief Financial Officer | F | −5,961 | −$13.05K |
| 2024-09-25 | James Ison | CPO | MIXED | −4,440 | −$9.72K |
| 2024-08-21 | John W Morrison Jr. | Chief Financial Officer | F | −4,059 | −$8.77K |
| 2024-08-21 | James Ison | CPO | MIXED | −3,271 | −$7.07K |
| 2024-08-15 | Joseph M. Manko Jr. | Director | Buy | +75,000 | +$146.75K |
| 2024-07-11 | Kenneth F Potashner | Director | M | +40,000 | +$18.40K |
| 2024-07-03 | Kenneth F Potashner | Director | A | +21,000 | — |
| 2024-07-03 | Michael J. Dumont | Director | A | +21,000 | — |
| 2024-07-03 | James Ison | CPO | A | +44,300 | — |
| 2024-07-03 | John W Morrison Jr. | Chief Financial Officer | A | +71,300 | — |
| 2024-07-03 | Mitchell H Herbets | Director | A | +21,000 | — |
| 2024-07-03 | Gioia Messinger | Director | A | +21,000 | — |
| 2024-07-03 | Gregory W Matz | Director | A | +21,000 | — |
| 2024-07-03 | Michael Knowles | Chief Executive Officer | A | +131,450 | — |
| 2024-07-03 | Joseph M. Manko Jr. | Director | A | +21,000 | — |
| 2024-06-18 | Michael Knowles | Chief Executive Officer | F | −38,050 | −$82.95K |
| 2024-05-28 | John W Morrison Jr. | Chief Financial Officer | F | −1,257 | −$3.03K |
| 2024-05-28 | James Ison | CPO | MIXED | −1,031 | −$2.48K |
| 2024-04-03 | Kenneth F Potashner | Director | M | +19,767 | +$42.50K |
| 2024-04-03 | David Raun | Director | M | +13,953 | +$30.00K |
| 2024-03-27 | John W Morrison Jr. | Chief Financial Officer | F | −12,504 | −$48.77K |
| 2024-03-27 | James Ison | CPO | MIXED | −9,677 | −$37.74K |
| 2024-02-07 | John W Morrison Jr. | Chief Financial Officer | F | −4,624 | −$9.29K |
| 2024-02-07 | James Ison | CPO | MIXED | −3,766 | −$7.57K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Michael Knowles | Chief Executive Officer | 590,141 | $3.53M |
| James Ison | CPO | 367,962 | $2.20M |
| Michael J. Dumont | Director | 206,682 | $1.24M |
| Daniel G. Gabel | Chief Financial Officer | 150,064 | $897.38K |
| Gregory W Matz | Director | 89,414 | $534.70K |
| Mitchell H Herbets | Director | 48,984 | $292.92K |
| David George Bassett | Director | 24,984 | $149.40K |
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.
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.