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Updated Jul 16, 2026 · Last SEC filing 2026-07-02
Aptose Biosciences Inc. (APTO) has filed 8 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-02. 6 Form 8-K material event filings were reported by APTO in the last 90 days. InsiderAlpha tracks every APTO SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0000882361 |
|---|
| Form 4 filings (90d) | 8 |
|---|---|
| Form 8-K filings (90d) | 6 |
| Latest Form 4 filing | 2026-07-02 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Seizinger Bernd R. | Insider | D — Derivative transaction | 17.0K | $1.72 | $29K | SEC | |
| Bejar Rafael | Insider | D — Derivative transaction | 244 | $1.72 | $420 | SEC | |
| BURGER DENIS R | Insider | D — Derivative transaction | 70 | $1.72 | $120 | SEC | |
| Whitehead Warren | Insider | D — Derivative transaction | 33 | $1.72 | $57 | SEC | |
| Rice William G. | Chair, President & CEO | D — Derivative transaction | 613.3K | $1.72 | $1.05M | SEC | |
| PLATZER ERICH | Insider | D — Derivative transaction | 1.1K | $1.72 | $2K | SEC | |
| Payne Fletcher | Insider | D — Derivative transaction | 222 | $1.72 | $382 | SEC | |
| Payne Fletcher | Insider | D — Derivative transaction | 22 | $1.72 | $38 | SEC | |
| Vincent Mark D. | Insider | D — Derivative transaction | 14 | $1.72 | $24 | SEC | |
| Rice William G. | Chair, President & CEO | P — Open-market purchase | 100.0K | $0.20 | $20K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Aptose Biosciences Inc. (APTO). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Rice William G. | 13 | $1.05M |
| PLATZER ERICH | 11 | $2K |
| Vincent Mark D. | 11 | $24 |
| BURGER DENIS R | 11 | $120 |
| Whitehead Warren | 10 | $57 |
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in APTO 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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