// company-profile
Aptose Biosciences Inc. Insider Trading
APTOFEvery SEC Form 4 insider trading filing for Aptose Biosciences Inc. (APTOF) — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC.
curl "https://api.form4api.com/v1/transactions?ticker=APTOF" -H "X-Api-Key: YOUR_API_KEY"// activity-summary
No insider transactions in the last 30 days.
// 90-day insight
Over the last 90 days, Aptose Biosciences Inc. insiders sold $1.1M across 50 transactions with no open-market purchases.
- Most active insider: PLATZER ERICH with 11 transactions totaling $2K.
- Largest single sale: $1.1M by Rice William G. on Jun 30, 2026.
Activity skews bearish — sales outpace buys.
Institutional Ownership
Top 13F-HR holders of Aptose Biosciences Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 30, 2026 | Seizinger Bernd R. | APTOF | Disposition | 50,000 | $0.00 | $0K |
| Jun 30, 2026 | Vincent Mark D. | APTOF | Disposition | 50,000 | $0.00 | $0K |
| Jun 30, 2026 | Whitehead Warren | APTOF | Disposition | 33 | $1.72 | $0K |
| Jun 30, 2026 | Whitehead Warren | APTOF | Disposition | 3,333 | $0.00 | $0K |
| Jun 30, 2026 | Whitehead Warren | APTOF | Disposition | 100,000 | $0.00 | $0K |
45 more transactions hidden
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