Aptose Biosciences Inc.
APTODelisted- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0000882361
Aptose Biosciences Inc. was delisted in 2025; its insiders filed their last Form 4 on Jul 2, 2026; 24 institutions reported holding it in 13F filings for Q4 2024, worth $892.9K in total; no superinvestor held it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Aptose Biosciences Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 0 filings
- Insiders trading
- 0
- Net value
- $0
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Aptose Biosciences Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Seizinger Bernd R. | Other: FORMER DIRECTOR | 0 | Jul 2, 2026 | 1 |
| Whitehead Warren | Other: FORMER DIRECTOR | 0 | Jul 1, 2026 | 1 |
| Vincent Mark D. | Other: FORMER DIRECTOR | 0 | Jul 1, 2026 | 1 |
| Rice William G. | Chair, President & CEO | 0 | Jul 1, 2026 | 1 |
| Platzer Erich | Other: FORMER DIRECTOR | 0 | Jul 1, 2026 | 1 |
| Payne Fletcher | Other: FORMER SVP AND CFO | 0Indirect | Jul 1, 2026 | 1 |
| Burger Denis R | Other: FORMER DIRECTOR | 0 | Jul 1, 2026 | 1 |
| Bejar Rafael | Other: Former SVP&Ch Medical Officer | 0 | Jul 1, 2026 | 1 |
| Ledru Philippe | Other: Former Officer | 100,500 | May 10, 2024 | 0 |
| Ashe Carol Gail | Director | – | Feb 7, 2024 | 0 |
| Loewy Caroline M | Other: Former Director | – | Jun 15, 2022 | 0 |
| Marango Jotin | Senior VP, CFO, and CBO | – | Jan 20, 2022 | 0 |
| DRW Holdings, LLC | 10% Owner | 8,888,275Indirect | Aug 5, 2021 | 0 |
| Wilson Donald R. Jr. | 10% Owner | 8,888,275Indirect | Aug 5, 2021 | 0 |
| DRW Commodities, LLC | 10% Owner | 8,888,275Indirect | Aug 5, 2021 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jul 6, 2021 (view filing) | Jul 2 | 4 days | Rice William G.Chair, President & CEO | PPurchase | +6.08K | $3.29 | +$20.0K | +2.0%303.6K after | |
| Aug 5, 2021 (view filing)9:54 PM ET | Aug 3 | 2 days | DRW Holdings, LLC and 2 others10% Owner | PPurchase | +57.2K | $2.65 | +$151.4K | +0.6%8.95M after | |
| Aug 5, 2021 (view filing)9:54 PM ET | Aug 5 | Same day | DRW Holdings, LLC and 2 others10% Owner | SSale | −60.0K | $2.62 | −$157.2K | −0.7%8.89M after | |
| Nov 19, 2021 (view filing) | Nov 19 | Same day | Bejar RafaelSr. VP, Chief Medical Officer | PPurchase | +10.0K | $2.56 | +$25.6K | New position10.0K after | |
| Nov 29, 2021 (view filing) | Nov 26 | 3 days | Rice William G.Chair, President & CEO | PPurchase | +8.64K | $2.31 | +$20.0K | +2.8%312.2K after | |
| Dec 15, 2021 (view filing) | Dec 15 | Same day | Rice William G.Chair, President & CEO | PPurchase | +17.8K | $1.12 | +$20.0K | +5.7%330.1K after | |
| Dec 17, 2021 (view filing) | Dec 16 | 1 day | Rice William G.Chair, President & CEO | PPurchase | +13.2K | $1.52 | +$20.0K | +4.0%343.3K after | |
| Dec 17, 2021 (view filing) | Dec 15 | 2 days | Platzer ErichDirector | PPurchase | +270.0K | $1.17 | +$316.9K | +200.0%405.0K after | 4 lots |
| Dec 20, 2021 (view filing) | Dec 16 | 4 days | Platzer ErichDirector | PPurchase | +100.0K | $1.38 | +$137.9K | +24.7%505.0K after | 3 lots |
| Dec 21, 2021 (view filing) | Dec 20 | 1 day | Burger Denis RDirector | PPurchase | +10.0K | $1.45 | +$14.5K | +46.1%31.7K after | Amended |
| Jun 6, 2022 (view filing) | Jun 6 | Same day | Rice William G.Chair, President & CEO | PPurchase | +10.0K | $0.97 | +$9.70K | +2.9%353.3K after | |
| Sep 21, 2022 (view filing) | Sep 19 | 2 days | Payne FletcherSR VP & Chief Fin. Officer | PPurchase | +10.0K | $0.68 | +$6.80K | New position10.0K after | |
| Sep 21, 2022 (view filing) | Sep 19 | 2 days | Rice William G.Chair, President & CEO | PPurchase | +10.0K | $0.68 | +$6.80K | +2.8%363.3K after | |
| Sep 25, 2023 (view filing) | Sep 22 | 3 days | Seizinger Bernd R.Director | PPurchase | +17.0K | $3.14 | +$53.4K | New position17.0K after | |
| Nov 26, 2024 (view filing)6:56 PM ET | Nov 25 | 1 day | Rice William G.Chair, President & CEO | PPurchase | +100.0K | $0.20 | +$20.0K | +19.5%613.3K after | |
| Nov 26, 2024 (view filing)6:56 PM ET | Nov 25 | 1 day | Rice William G.Chair, President & CEO | PPurchase | +50.0K | – | – | –50.0K after | Derivative |