OSS insider transaction filings
ONE STOP SYSTEMS, INC. — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-09-04. Screen OSS transaction legs live →
Insider transaction summary — last 90 days
2026-06-24 to 2026-09-22, from the filings listed below: 2 Form 4 filings. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): none reported.
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 3.
By insider — same window
Open-market purchase/sale legs on non-derivative securities, grouped by the filing's reporting owner(s); joint filings appear once. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Insider | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|
| KNOWLES MICHAEL — Chief Executive Officer, Director | 1 | — | — | 2 |
| Gabel Daniel G. — Chief Financial Officer | 1 | — | — | 1 |
Recent Form 4 filings — ONE STOP SYSTEMS, INC.
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-04 | 4 | Gabel Daniel G. — Chief Financial Officer | Tax withholding (F): 3,832 @ $13.32 | EDGAR |
| 2026-09-04 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Tax withholding (F): 8,621 @ $13.32 · Tax withholding (F): 8,621 @ $13.61 | EDGAR |
| 2026-06-12 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Tax withholding (F): 19,675 @ $16.89 | EDGAR |
| 2026-05-28 | 4 | Gabel Daniel G. — Chief Financial Officer | Tax withholding (F): 1,613 @ $15.68 | EDGAR |
| 2026-05-26 | 4 | BASSETT DAVID GEORGE — Director | Grant/award (A): 21,000 @ $0 · Grant/award (A): 11,984 @ $0 · Sale (S): 8,000 @ $17.64 | EDGAR |
| 2026-05-26 | 4 | Matz Gregory W — Director | Grant/award (A): 11,984 @ $0 · Sale (S): 8,000 @ $17.52 | EDGAR |
| 2026-05-26 | 4 | Dumont Michael J. — Director | Grant/award (A): 11,984 @ $0 | EDGAR |
| 2026-05-26 | 4 | Herbets Mitchell H — Director | Grant/award (A): 11,984 @ $0 · Sale (S): 5,000 @ $17.62 | EDGAR |
| 2026-03-27 | 4/A | KNOWLES MICHAEL — Chief Executive Officer, Director | Grant/award (A): 0 @ $0 | EDGAR |
| 2026-03-02 | 4 | Gabel Daniel G. — Chief Financial Officer | Tax withholding (F): 7,799 @ $9.24 | EDGAR |
| 2026-03-02 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Tax withholding (F): 13,298 @ $9.24 · Tax withholding (F): 6,650 @ $8.70 | EDGAR |
| 2026-03-02 | 4 | Ison James — CPO | Grant/award (A): 34,313 @ $0 · Tax withholding (F): 6,546 @ $9.24 · Gift (G): 8,213 @ $0 · Gift (G): 8,213 @ $0 · Tax withholding (F): 3,120 @ $8.70 · Gift (G): 4,263 @ $0 · +1 more | EDGAR |
| 2026-02-11 | 4 | Gabel Daniel G. — Chief Financial Officer | Grant/award (A): 55,239 @ $0 | EDGAR |
| 2026-02-11 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Grant/award (A): 101,862 @ $0 | EDGAR |
| 2026-01-12 | 4 | Gabel Daniel G. — Chief Financial Officer | Tax withholding (F): 3,215 @ $7.18 | EDGAR |
| 2026-01-07 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Tax withholding (F): 19,075 @ $7.18 | EDGAR |
| 2025-09-02 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Grant/award (A): 131,448 @ $4.06 · Tax withholding (F): 16,800 @ $3.76 · Grant/award (A): 21,000 @ $0 · Tax withholding (F): 19,075 @ $3.06 · Tax withholding (F): 8,359 @ $5.26 | EDGAR |
| 2025-08-25 | 4 | Ison James — CPO | Tax withholding (F): 3,113 @ $5.26 · Gift (G): 4,271 @ $0 · Gift (G): 4,271 @ $0 | EDGAR |
| 2025-05-28 | 4 | Herbets Mitchell H — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2025-05-27 | 4 | Dumont Michael J. — Director | Tax withholding (F): 21,000 @ $0 | EDGAR |
| 2025-05-23 | 4 | Matz Gregory W — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2025-03-13 | 4 | Ison James — CPO | Tax withholding (F): 7,006 @ $3.76 · Gift (G): 7,760 @ $0 · Gift (G): 7,760 @ $0 | EDGAR |
| 2025-03-05 | 4 | Gabel Daniel G. — Chief Financial Officer | Grant/award (A): 71,284 @ $4.06 | EDGAR |
| 2025-02-24 | 4 | Ison James — CPO | Grant/award (A): 44,279 @ $4.06 | EDGAR |
| 2024-12-30 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Tax withholding (F): 17,525 @ $2.41 | EDGAR |
| 2024-11-12 | 4 | Morrison John W Jr. — Chief Financial Officer | Holdings only — no transactions reported | EDGAR |
| 2024-11-12 | 4 | Gabel Daniel G. — Chief Financial Officer | Grant/award (A): 40,000 @ $0 | EDGAR |
| 2024-09-25 | 4 | Ison James — CPO | Tax withholding (F): 4,440 @ $2.19 · Gift (G): 8,227 @ $0 · Gift (G): 8,227 @ $0 | EDGAR |
| 2024-09-25 | 4 | Morrison John W Jr. — Chief Financial Officer | Tax withholding (F): 5,961 @ $2.19 | EDGAR |
| 2024-08-21 | 4 | Ison James — CPO | Tax withholding (F): 3,271 @ $2.16 · Gift (G): 6,062 @ $0 · Gift (G): 6,062 @ $0 | EDGAR |
| 2024-08-21 | 4 | Morrison John W Jr. — Chief Financial Officer | Tax withholding (F): 4,059 @ $2.16 | EDGAR |
| 2024-08-15 | 4 | Manko Joseph M. Jr. — Director | Purchase (P): 50,000 @ $1.94 · Purchase (P): 25,000 @ $1.99 | EDGAR |
| 2024-07-11 | 4 | POTASHNER KENNETH F — Director | Option exercise (M): 40,000 @ $0.46 · Option exercise (M): 40,000 (derivative) @ $0 | EDGAR |
| 2024-07-03 | 4 | Ison James — CPO | Grant/award (A): 44,300 @ $0 | EDGAR |
| 2024-07-03 | 4 | Morrison John W Jr. — Chief Financial Officer | Grant/award (A): 71,300 @ $0 | EDGAR |
| 2024-07-03 | 4 | Matz Gregory W — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2024-07-03 | 4 | Messinger Gioia — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2024-07-03 | 4 | Herbets Mitchell H — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2024-07-03 | 4 | Dumont Michael J. — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2024-07-03 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Grant/award (A): 131,450 @ $0 | EDGAR |
| 2024-07-03 | 4 | Manko Joseph M. Jr. — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2024-07-03 | 4 | POTASHNER KENNETH F — Director | Grant/award (A): 21,000 @ $0 | EDGAR |
| 2024-06-18 | 4 | KNOWLES MICHAEL — Chief Executive Officer, Director | Tax withholding (F): 38,050 @ $2.18 | EDGAR |
| 2024-05-28 | 4 | Ison James — CPO | Tax withholding (F): 1,031 @ $2.41 · Gift (G): 1,469 @ $0 · Gift (G): 1,469 @ $0 | EDGAR |
| 2024-05-28 | 4 | Morrison John W Jr. — Chief Financial Officer | Tax withholding (F): 1,257 @ $2.41 | EDGAR |
| 2024-04-03 | 4 | RAUN DAVID — Director | Option exercise (M): 13,953 @ $2.15 · Option exercise (M): 13,953 (derivative) @ $0 | EDGAR |
| 2024-04-03 | 4 | POTASHNER KENNETH F — Director | Option exercise (M): 19,767 @ $2.15 · Option exercise (M): 19,767 (derivative) @ $0 | EDGAR |
| 2024-03-27 | 4 | Ison James — CPO | Tax withholding (F): 9,677 @ $3.90 · Gift (G): 15,656 @ $0 · Gift (G): 15,656 @ $0 | EDGAR |
| 2024-03-27 | 4 | Morrison John W Jr. — Chief Financial Officer | Tax withholding (F): 12,504 @ $3.90 | EDGAR |
| 2024-02-07 | 4 | Morrison John W Jr. — Chief Financial Officer | Tax withholding (F): 4,624 @ $2.01 | EDGAR |
Recent 8-K events — ONE STOP SYSTEMS, INC.
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-08-05 | 8-K | 1.01 — Entry into a Material Definitive Agreement 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-19 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 5.07 — Submission of Matters to a Vote of Security Holders 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-08 | 8-K | 2.02 — Results of Operations and Financial Condition 7.01 — Regulation FD Disclosure | EDGAR |
| 2026-04-15 | 8-K | 7.01 — Regulation FD Disclosure | EDGAR |
| 2026-01-06 | 8-K | 1.01 — Entry into a Material Definitive Agreement 2.01 — Completion of Acquisition or Disposition of Assets 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-10-01 | 8-K | 1.01 — Entry into a Material Definitive Agreement 7.01 — Regulation FD Disclosure | EDGAR |
| 2025-05-20 | 8-K | 5.07 — Submission of Matters to a Vote of Security Holders | EDGAR |
| 2025-05-09 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers | EDGAR |
| 2025-04-21 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers | EDGAR |
| 2025-04-15 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 5.03 — Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year | EDGAR |
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