22 institutions reported holding $1.8M of CLEARSIGN TECHNOLOGIES CORP (CLIRW) in SEC 13F filings for 2026-03-31. Largest institutional holders: VANGUARD CAPITAL MANAGEMENT LLC ($459,670), SIMON QUICK ADVISORS, LLC ($262,969), GEODE CAPITAL MANAGEMENT, LLC ($251,544), Cambridge Investment Research Advisors, Inc. ($193,000), Beacon Pointe Advisors, LLC ($118,475). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | $459,670 | 105,429 | New |
| 2 | SIMON QUICK ADVISORS, LLC | $262,969 | 60,314 | New |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | $251,544 | 57,683 | New |
| 4 | Cambridge Investment Research Advisors, Inc. | $193,000 | 44,300 | New |
| 5 | Beacon Pointe Advisors, LLC | $118,475 | 27,173 | New |
| 6 | VANGUARD FIDUCIARY TRUST CO | $102,286 | 23,460 | New |
| 7 | BlackRock, Inc. | $85,033 | 19,503 | New |
| 8 | HighTower Advisors, LLC | $55,285 | 12,680 | New |
| 9 | Creative Planning | $53,868 | 12,355 | New |
| 10 | DDD Partners, LLC | $52,320 | 12,000 | New |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $45,780 | 10,500 | New |
| 12 | Rockefeller Capital Management L.P. | $35,403 | 8,120 | New |
| 13 | NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | $31,270 | 7,172 | New |
| 14 | WELLS FARGO & COMPANY/MN | $9,265 | 2,125 | New |
| 15 | Gleason Group, Inc. | $7,857 | 1,802 | New |
| 16 | Centerpoint Advisors, LLC | $7,000 | 1,560 | New |
| 17 | Vanguard Global Advisers, LLC | $5,886 | 1,350 | New |
| 18 | Tower Research Capital LLC (TRC) | $4,556 | 1,045 | New |
| 19 | DEUTSCHE BANK AG\ | $1,744 | 400 | New |
| 20 | SBI Securities Co., Ltd. | $48 | 11 | New |
| 21 | GROUP ONE TRADING LLC | $39 | 9 | Trimmed |
| 22 | SIMPLEX TRADING, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31