APTOF
Aptose Biosciences Inc.Company with tickers: APTOF
CIK
882361
CUSIP
03835T408
Shares Outstanding
2,552,429
13F Activity (30d)
1 filings
1 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 4
Total Value: $40,043
Total Shares: 23,979
Institutional Ownership Trend
Holder Concentration
Across 4 13F filers · Δ vs Dec 31, 2025Top Holder
82.4%
−0.0 pts
Top 5
100.0%
0.0 pts
Top 10
100.0%
0.0 pts
HHI
7,099
Highly concentrated
−1
Quarterly Activity
vs Dec 31, 2025
New
0
Increased
0
Decreased
0
Sold Out
0
Unchanged
4
Holder count:
0
Institutional value:
+12.8%
Shares held:
0.0%
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mid DRW Securities, LLC Broker-Dealer | $33,000 | 82.41% | 19,761 | Shares | Other | 2026-05-13 | ||||
| Micro Gleason Group, Inc. | $7,024 | 17.54% | 4,206 | Shares | Sole | 2026-05-04 | ||||
| Mid Farther Finance Advisors, LLC | $16 | 0.04% | 10 | Shares | Sole | 2026-04-07 | ||||
| Small CALDWELL SUTTER CAPITAL, INC. | $3 | 0.01% | 2 | Shares | Sole | 2026-05-06 | ||||
| No holders match your search. | ||||||||||