46 institutions reported holding $70.0M of LEONABIO INC (ATHA) in SEC 13F filings for 2026-03-31. Largest institutional holders: PERCEPTIVE ADVISORS LLC ($19.1M), Kalehua Capital Management LLC ($8.1M), ADAR1 Capital Management, LLC ($7.5M), ACORN CAPITAL ADVISORS, LLC ($6.5M), Commodore Capital LP ($4.8M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | PERCEPTIVE ADVISORS LLC | $19.1M | 1.9M | Hold |
| 2 | Kalehua Capital Management LLC | $8.1M | 787,402 | Added |
| 3 | ADAR1 Capital Management, LLC | $7.5M | 727,481 | Added |
| 4 | ACORN CAPITAL ADVISORS, LLC | $6.5M | 634,539 | Added |
| 5 | Commodore Capital LP | $4.8M | 464,398 | Hold |
| 6 | NEA Management Company, LLC | $4.8M | 464,398 | Hold |
| 7 | TCG Crossover Management, LLC | $4.7M | 464,398 | Hold |
| 8 | Spruce Street Capital LP | $3.8M | 393,701 | Hold |
| 9 | VANGUARD CAPITAL MANAGEMENT LLC | $2.0M | 194,760 | New |
| 10 | Seven Fleet Capital Management LP | $1.7M | 164,676 | Added |
| 11 | Simplify Asset Management Inc. | $1.5M | 149,279 | Hold |
| 12 | Propel Bio Management, LLC | $1.5M | 149,279 | Hold |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | $826,214 | 80,323 | Added |
| 14 | RENAISSANCE TECHNOLOGIES LLC | $660,202 | 64,222 | Trimmed |
| 15 | BlackRock, Inc. | $576,204 | 56,051 | Added |
| 16 | VANGUARD FIDUCIARY TRUST CO | $411,601 | 40,039 | New |
| 17 | BANK OF AMERICA CORP /DE/ | $334,778 | 32,566 | Trimmed |
| 18 | MILLENNIUM MANAGEMENT LLC | $325,650 | 31,678 | Trimmed |
| 19 | Laird Norton Wetherby Trust Company, LLC | $224,289 | 21,818 | Hold |
| 20 | STATE STREET CORP | $167,944 | 16,337 | Added |
| 21 | NORTHERN TRUST CORP | $147,970 | 14,394 | Added |
| 22 | TWO SIGMA INVESTMENTS, LP | $136,477 | 13,276 | Added |
| 23 | ACADIAN ASSET MANAGEMENT LLC | $105,000 | 10,230 | Trimmed |
| 24 | OSAIC HOLDINGS, INC. | $63,530 | 6,180 | Trimmed |
| 25 | Royal Bank of Canada | $23,000 | 2,225 | Added |
Source: SEC Form 13F filings · as of 2026-03-31