Aptose Biosciences Inc. (APTO)
Data as of , from SEC Form 4 filings.
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William G. Rice - OfficerOpen-market purchase$20K- William G. Rice - OfficerOpen-market purchase50,000 sh
- Bernd R. Seizinger
About Aptose Biosciences Inc. (APTO)
Aptose Biosciences Inc. is an SEC registrant, filing under CIK 0000882361, classified as biological products (no diagnostic substances). We track it alongside the rest of the Health Care sector. The registration was withdrawn on 23 March 2026, so the planned offering is not going ahead in its filed form.
APTO Form 4 activity by transaction type, last 90 days
No Form 4 activity for APTO in the last 90 days.
APTO insider transactions (Form 4)
749 Form 4 filings on record, the earliest from Nov 26, 2024, newest first.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Bernd R. Seizinger | Derivative | Common Shares | 17,000 | $1.72 footnote F2 | $29K | |
| Bernd R. Seizinger | Derivative | Director Stock Option (Right to Buy) | 3,333 | $0.00 | - | |
| Bernd R. Seizinger | Derivative | Stock Option (right to buy) | 100,000 | $0.00 | - | |
| Bernd R. Seizinger | Derivative | Stock Option (right to buy) | 50,000 | $0.00 | - | |
| ||||||
| Warren Whitehead | Derivative | Common Shares | 33 | $1.72 footnote F2 | $57 | |
| Warren Whitehead | Derivative | Director Option Grant | 100,000 | $0.00 | - | |
| Warren Whitehead | Derivative | Director Stock Option (Right to Buy) | 3,333 | $0.00 | - | |
| Warren Whitehead | Derivative | Director Option Grant | 50,000 | $0.00 | - | |
| Warren Whitehead | Derivative | Director Option Grant | 50,000 | $0.00 | - | |
| Warren Whitehead | Derivative | Director Option Grant | 50,000 | $0.00 | - | |
| Warren Whitehead | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Warren Whitehead | Derivative | Director Option Grant | 152,500 | $0.00 | - | |
| Warren Whitehead | Derivative | Stock Options (Right to Buy) | 40,000 | $0.00 | - | |
| Warren Whitehead | Derivative | Director Stock Option (Right to Buy) | 53,000 | $0.00 | - | |
| ||||||
| Mark D. Vincent | Derivative | Common Shares | 14 | $1.72 footnote F2 | $24 | |
| Mark D. Vincent | Derivative | Director Stock Option (Right to Buy) | 3,333 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Stock Option (Right to Buy) | 100,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Stock Option (Right to Buy) | 5,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Stock Option (Right to Buy) | 60,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Option Grant | 50,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Option Grant | 154,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Stock Options (Right to Buy) | 40,000 | $0.00 | - | |
| Mark D. Vincent | Derivative | Director Stock Option (Right to Buy) | 10,000 | $0.00 | - | |
| ||||||
| William G. Rice - Officer | Derivative | Common Shares | 613,252 | $1.72 footnote F2 | $1.05M | |
| William G. Rice - Officer | Derivative | Employee Stock Option ("Right to Buy") | 70,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Warrants | 50,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Employee Stock Option ("Right to Buy") | 400,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Performance Stock Options | 600,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Employee Option Grant | 700,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Employee Stock Option ("Right to Buy") | 343,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Employee Option Grant | 2,000,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Stock Options (Right to Buy) | 400,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Employee Stock Option (Right to Buy) | 100,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Employee Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Employee Stock Option (Right to Buy) | 300,000 | $0.00 | - | |
| William G. Rice - Officer | Derivative | Common Shares | 400,000 | $0.00 | - | |
| ||||||
| Erich Platzer | Derivative | Common Shares | 1,122 | $1.72 footnote F2 | $2K | |
| Erich Platzer | Derivative | Director Stock Option (Right to Buy) | 3,333 | $0.00 | - | |
| Erich Platzer | Derivative | Director Stock Option (Right to Buy) | 100,000 | $0.00 | - | |
| Erich Platzer | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Erich Platzer | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Erich Platzer | Derivative | Director Option Grant | 50,000 | $0.00 | - | |
| Erich Platzer | Derivative | Director Option Grant | 135,000 | $0.00 | - | |
| Erich Platzer | Derivative | Stock Options (Right to Buy) | 40,000 | $0.00 | - | |
| Erich Platzer | Derivative | Director Stock Option | 10,000 | $0.00 | - | |
| Erich Platzer | Derivative | Director Stock Option (Right to Buy) | 5,000 | $0.00 | - | |
| Erich Platzer | Derivative | Director Stock Option (Right to Buy) | 60,000 | $0.00 | - | |
| ||||||
| Fletcher Payne | Derivative | Common Shares | 222 | $1.72 footnote F2 | $382 | |
| Fletcher Payne | Derivative | Common Shares | 22 | $1.72 footnote F2 | $38 | |
| Fletcher Payne | Derivative | Employee Stock Option (Right to Buy) | 55,000 | $0.00 | - | |
| Fletcher Payne | Derivative | Employee Stock Option (Right to Buy) | 200,000 | $0.00 | - | |
| Fletcher Payne | Derivative | Common Stock (Option) | 1,000,000 | $0.00 | - | |
| ||||||
| Denis R. Burger | Derivative | Common Shares | 70 | $1.72 footnote F2 | $120 | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 3,333 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 100,000 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 50,000 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 160,334 | $0.00 | - | |
| Denis R. Burger | Derivative | Stock Options (Right to Buy) | 40,000 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 5,000 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 60,000 | $0.00 | - | |
| Denis R. Burger | Derivative | Director Stock Option (Right to Buy) | 10,000 | $0.00 | - | |
| ||||||
 Rafael Bejar | Derivative | Common Shares | 244 | $1.72 footnote F2 | $420 | |
| Rafael Bejar | Derivative | Employee Stock Option (Right to Buy) | 35,000 | $0.00 | - | |
| Rafael Bejar | Derivative | Employee Stock Option | 200,000 | $0.00 | - | |
| Rafael Bejar | Derivative | Performance Stock Option | 400,000 | $0.00 | - | |
| Rafael Bejar | Derivative | Employee Stock Option (Right to Buy) | 343,000 | $0.00 | - | |
| Rafael Bejar | Derivative | Employee Option Grant | 200,000 | $0.00 | - | |
| Rafael Bejar | Derivative | Employee Stock Option (Right to Buy) | 400,000 | $0.00 | - | |
| ||||||
| William G. Rice - Officer | Open-market purchase | Common Shares | 100,000 | $0.20 | $20K | |
| William G. Rice - Officer | Open-market purchase | Warrants | 50,000 | - | - | |
Item 2.01, 3.03, 5.01, 5.02, 8.01, 9.01
Item 7.01, 9.01
Item 7.01, 9.01
Item 7.01, 9.01
APTO insider trading FAQ
What is the latest insider trade for APTO?
Aptose Biosciences Inc. (APTO) has filed no insider reports in the last 90 days. The most recent on record is dated 2026-07-02. The full record for APTO runs to 9 Form 4 filings, the earliest from 2024-11-26. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying APTO stock?
No insider purchases of APTO were filed in the last 90 days. 2 purchases are on record for this company.
How many insiders are selling APTO stock?
No insider sales of APTO were filed in the last 90 days.
Where can I see APTO SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects APTO Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
9The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Bernd R. Seizinger view on EDGAR
- - Warren Whitehead view on EDGAR
- - Mark D. Vincent view on EDGAR
- - William G. Rice view on EDGAR
- - Erich Platzer view on EDGAR
- - Fletcher Payne view on EDGAR
- - Denis R. Burger view on EDGAR
- - Rafael Bejar view on EDGAR
- - William G. Rice view on EDGAR
Related companies with recent insider activity
Learn more
- What the Form 4 transaction codes mean
- Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
- Insider activity in Health Care
- Where APTO's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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