Who owns Amylyx Pharmaceuticals, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of AMLX from SEC Form 13F filings across 205 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 205 institutions disclosed 114.8M shares of Amylyx Pharmaceuticals, Inc. worth $2.06B — about 103.2% of shares outstanding; the largest disclosed holder is FMR LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
205
13F holders
$2.06B
value, 2026 filers
103.2%
of shares outstanding (114.8M sh)
50
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of AMLX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 16.7M | $300.4M | 0.0% | 15% | +0.6% |
| 2 | BlackRock, Inc. | 8.8M | $158.5M | 0.0% | 7.9% | 0.0% |
| 3 | PERCEPTIVE ADVISORS LLC | 8.3M | $149.7M | 2.2% | 7.5% | +0.6% |
| 4 | TCG Crossover Management, LLC | 6.2M | $112.1M | 2.7% | 5.6% | 0.0% |
| 5 | Commodore Capital LP | 5.7M | $101.5M | 6.0% | 5.1% | 0.0% |
| 6 | Jupiter Topco LLCNEW | 5.2M | $94.0M | 0.0% | 4.7% | new |
| 7 | Saturn V Capital Management LP | 4.6M | $83.0M | 11.9% | 4.2% | +6.3% |
| 8 | VANGUARD CAPITAL MANAGEMENT LLC | 4.2M | $75.9M | 0.0% | 3.8% | +2.0% |
| 9 | MORGAN STANLEY | 3.1M | $56.2M | 0.0% | 2.8% | +43.9% |
| 10 | Driehaus Capital Management LLC | 3.0M | $54.5M | 0.3% | 2.7% | +1.7% |
| 11 | First Light Asset Management, LLC | 3.0M | $54.3M | 3.3% | 2.7% | -5.2% |
| 12 | FRANKLIN RESOURCES INC | 3.0M | $53.0M | 0.0% | 2.7% | +30.5% |
| 13 | GOLDMAN SACHS GROUP INC | 2.9M | $51.3M | 0.0% | 2.6% | +8.8% |
| 14 | STATE STREET CORP | 2.6M | $46.8M | 0.0% | 2.3% | +10.2% |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | 2.3M | $41.9M | 0.0% | 2.1% | +5.6% |
| 16 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.9M | $34.1M | 0.0% | 1.7% | -46.6% |
| 17 | JPMORGAN CHASE & CO | 1.9M | $34.9M | 0.0% | 1.7% | +1067.2% |
| 18 | Siren, L.L.C. | 1.5M | $26.6M | 0.5% | 1.3% | +20.4% |
| 19 | EVENTIDE ASSET MANAGEMENT, LLC | 1.3M | $23.8M | 0.3% | 1.2% | -12.3% |
| 20 | 683 Capital Management, LLC | 1.3M | $23.0M | 1.1% | 1.2% | -16.4% |
| 21 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.1M | $19.1M | 0.0% | 1% | +12.4% |
| 22 | Alyeska Investment Group, L.P.NEW | 1.1M | $18.9M | 0.0% | 0.9% | new |
| 23 | Almitas Capital LLC | 974,881 | $17.5M | 4.2% | 0.9% | -54.1% |
| 24 | DIMENSIONAL FUND ADVISORS LP | 902,463 | $16.2M | 0.0% | 0.8% | -0.1% |
| 25 | Jones Hill Capital LP | 894,058 | $16.1M | 3.4% | 0.8% | -44.1% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.