Aptose Biosciences Inc.
High confidence (85%)
Updated Oct 7, 2026, 12:05 AM
What is happening
Derived by rule set status-rules-2026.09.7
The company deregistered its securities and stopped filing with the SEC. Companies do that when they are acquired, when they go private, and when they fail; the filing does not say which.
Latest material event: Aptose Biosciences Inc. deregistered its securities (Jul 1, 2026)
Timeline
Every material event, newest first. History is never overwritten.
Aptose Biosciences Inc. deregistered its securities
Jul 1, 2026
Registration withdrawn
- SEC EDGAR — “15-12G 1 d162567d1512g.htm 15-12G 15-12G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTSRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-32001 APTOSE BIOSCIENCES INC. (Exact name of registrant as specified in its charter) 66 Wellington Street West, Suite 5300 TD Bank Tower, Box 48 Toronto, Ontario M5K 1E6 Canada (647) 479-9828 (Address, including zip code, and tel…”
Company information
- Founded
- —
- Employees (estimate)
- —
- Industry
- Biological Products, (No Diagnostic Substances)
- Subindustry
- —
- Listing
- SEC lists the ticker APTOF.
- SEC CIK
- 0000882361
- Website
- —
- —
- Headquarters
- TORONTO
- Also known as
- Aptose Biosciences Inc., (formerly LORUS THERAPEUTICS INC.), IMUTEC PHARMA INC, LORUS THERAPEUTICS INC
- Legal entities
- Aptose Biosciences Inc.
Sources
Every material source used to build this profile.
SEC Company Submissions (TIER 1 · UNVERIFIED)
Aptose Biosciences Inc. — Biological Products, (No Diagnostic Substances) (SIC 2836) — TORONTO
View source recordSEC EDGAR (TIER 1 · UNVERIFIED)
15-12G 1 d162567d1512g.htm 15-12G 15-12G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTSRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-32001 APTOSE BIOSCIENCES INC. (Exact name of registrant as specified in its charter) 66 Wellington Street West, Suite 5300 TD Bank Tower, Box 48 Toronto, Ontario M5K 1E6 Canada (647) 479-9828 (Address, including zip code, and tel…
View source record
Status history
Every derived status, with the rule that produced it.
- NO_LONGER_LISTED → NO_LONGER_LISTEDPUBLIC_LISTING_ENDED · Sep 18, 2026, 01:29 AM
The company deregistered its securities and stopped filing with the SEC. Companies do that when they are acquired, when they go private, and when they fail; the filing does not say which.
- DISTRESS_SIGNAL → NO_LONGER_LISTEDPUBLIC_LISTING_ENDED · Sep 18, 2026, 01:14 AM
The company deregistered its securities and stopped filing with the SEC. Companies do that when they are acquired, when they go private, and when they fail; the filing does not say which.
- DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 15, 2026, 12:34 PM
The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.
- DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 14, 2026, 04:47 PM
The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.
- UNKNOWN → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 8, 2026, 03:17 AM
The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.