4 institutions reported holding $38,695 of APTOSE BIOSCIENCES INC (APTOF) in SEC 13F filings for 2026-06-30. Largest institutional holders: DRW Securities, LLC ($32,012), Gleason Group, Inc. ($6,341), CALDWELL SUTTER CAPITAL, INC. ($327), Farther Finance Advisors, LLC ($15). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | DRW Securities, LLC | $32,012 | 19,761 | Hold |
| 2 | Gleason Group, Inc. | $6,341 | 4,206 | Hold |
| 3 | CALDWELL SUTTER CAPITAL, INC. | $327 | 202 | Added |
| 4 | Farther Finance Advisors, LLC | $15 | 10 | Hold |
Source: SEC Form 13F filings · as of 2026-06-30