Updated Jul 16, 2026 · Last SEC filing 2026-06-12
ONE STOP SYSTEMS, INC. (OSS) has filed 6 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-12. 2 Form 8-K material event filings were reported by OSS in the last 90 days. 3 Form 144 notices of proposed sale were filed for OSS stock. InsiderAlpha tracks every OSS SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0001394056 |
|---|
| Form 4 filings (90d) | 6 |
|---|---|
| Form 8-K filings (90d) | 2 |
| Form 144 notices (90d) | 3 |
| Latest Form 4 filing | 2026-06-12 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| KNOWLES MICHAEL | Chief Executive Officer | F — Tax withholding / forfeiture | 19.7K | $16.89 | $332K | SEC | |
| Herbets Mitchell H | Insider | S — Open-market sale | 5.0K | $17.62 | $88K | SEC | |
| Matz Gregory W | Insider | S — Open-market sale | 8.0K | $17.52 | $140K | SEC | |
| BASSETT DAVID GEORGE | Insider | S — Open-market sale | 8.0K | $17.64 | $141K | SEC | |
| Matz Gregory W | Insider | A — Grant or award | 12.0K | $0.00 | — | SEC | |
| Dumont Michael J. | Insider | A — Grant or award | 12.0K | $0.00 | — | SEC | |
| BASSETT DAVID GEORGE | Insider | A — Grant or award | 12.0K | $0.00 | — | SEC | |
| Herbets Mitchell H | Insider | A — Grant or award | 12.0K | $0.00 | — | SEC | |
| Gabel Daniel G. | Chief Financial Officer | F — Tax withholding / forfeiture | 1.6K | $15.68 | $25K | SEC | |
| KNOWLES MICHAEL | Chief Executive Officer | F — Tax withholding / forfeiture | 6.7K | $8.70 | $58K | SEC | |
| Ison James | CPO | G — Bona-fide gift | 4.3K | $0.00 | — | SEC | |
| Ison James | CPO | G — Bona-fide gift | 4.3K | $0.00 | — | SEC | |
| Ison James | CPO | F — Tax withholding / forfeiture | 3.1K | $8.70 | $27K | SEC | |
| Ison James | CPO | F — Tax withholding / forfeiture | 6.5K | $9.24 | $60K | SEC | |
| Ison James | CPO | A — Grant or award | 34.3K | $0.00 | — | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for ONE STOP SYSTEMS, INC. (OSS). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| BASSETT DAVID GEORGE | 3 | $141K |
| Matz Gregory W | 2 | $140K |
| Herbets Mitchell H | 2 | $88K |
| KNOWLES MICHAEL | 1 | $332K |
| Gabel Daniel G. | 1 | $25K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in OSS insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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