APTO Aptose Biosciences, Inc.
NASDAQNo longer listedCommon stock
APTO was the NASDAQ ticker symbol of Aptose Biosciences, Inc. It no longer appears in current US listing files, which usually means the security was delisted, acquired, merged, or moved to a new symbol.
APTO at a glance
- Symbol
- APTO
- Company / issuer
- Aptose Biosciences, Inc.
- Security type
- Common stock
- Last exchange
- NASDAQ
- Status
- No longer listed
- Seen in listing files
- Jan 2015 – Apr 2025
- Sector
- Health Care
- Industry
- Biotechnology: Biological Products (No Diagnostic Substances)
- Country
- Canada
- Last reported market cap
- $7.9 million (Mar 2025)
APTO ticker history
All listing names we have recorded under the symbol APTO, from periodic snapshots of US exchange listing files.
| Name | Security | First seen | Last seen |
|---|---|---|---|
| Aptose Biosciences, Inc. | Common Shares | Jan 2015 | Apr 2025 |
Snapshots have gaps (notably 2018–2021, and 2015–2021 for NYSE listings), so the actual delisting date may be later than the last-seen date.
Frequently asked questions
What company has the ticker symbol APTO?
APTO was the ticker symbol of Aptose Biosciences, Inc on NASDAQ.
Is APTO still trading?
No. APTO does not appear in current US exchange listings as of Sep 2026; it was last seen in our listing snapshots in Apr 2025.
Which exchange was APTO listed on?
APTO was listed on NASDAQ.
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