4 institutions reported holding $39,965 of APTOSE BIOSCIENCES INC (APTOF) in SEC 13F filings for 2026-03-31. Largest institutional holders: DRW Securities, LLC ($32,921), Gleason Group, Inc. ($7,024), Farther Finance Advisors, LLC ($17), CALDWELL SUTTER CAPITAL, INC. ($3). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | DRW Securities, LLC | $32,921 | 19,761 | Hold |
| 2 | Gleason Group, Inc. | $7,024 | 4,206 | Hold |
| 3 | Farther Finance Advisors, LLC | $17 | 10 | Hold |
| 4 | CALDWELL SUTTER CAPITAL, INC. | $3 | 2 | Hold |
Source: SEC Form 13F filings · as of 2026-03-31