Amylyx Pharmaceuticals
AMLX · NASDAQ
$28.77+$1.44 (+5.27%)TodayMarket closed ·
Prev close $27.33
Who owns AMLX
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 57.7% of AMLX’s shares.
- Fidelity Management & Research Company LLC13.5%
- Perceptive Advisors LLC7.5%
- BlackRock Institutional Trust Company, N.A.6.7%
- TCG Crossover Management, LLC5.6%
- Next 6 largest institutions24.3%
- All other shareholders42.3%
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity Management & Research Company LLC | 15.04M | 13.53% |
| Perceptive Advisors LLC | 8.33M | 7.50% |
| BlackRock Institutional Trust Company, N.A. | 7.48M | 6.73% |
| TCG Crossover Management, LLC | 6.24M | 5.62% |
| Commodore Capital LP | 5.65M | 5.08% |
| Janus Henderson Investors | 5.24M | 4.71% |
| Saturn V Capital Management LP | 4.62M | 4.16% |
| Vanguard Capital Management, LLC | 4.22M | 3.80% |
| Cohen (Joshua Barry) | 3.64M | 3.28% |
| Klee (Justin B) | 3.64M | 3.28% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 3.17M | 2.85% |
| Fidelity Advisor Biotechnology Fund | 2.43M | 2.19% |
| iShares Russell 2000 ETF | 2.36M | 2.13% |
| Fidelity Small Cap Growth Fund | 2.12M | 1.90% |
| Eventide Healthcare & Life Sciences Fund | 1.51M | 1.36% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders bought $51.34K (1 trade) and sold $4.31M (13 trades) of AMLX on the open market.
| Insider | Type | Shares | Value |
|---|---|---|---|
| MILNE GEORGE M JR | Sale | 30.00K | $830.90K |
| Mazzariello Gina | Sale | 11 | $367 |
| Mazzariello Gina | Sale | 9.53K | $309.14K |
| Cohen Joshua B | Sale | 919 | $30.46K |
| Cohen Joshua B | Sale | 29.55K | $950.04K |
| Klee Justin B. | Sale | 1.44K | $47.71K |
| Klee Justin B. | Sale | 29.02K | $932.55K |
| Bedrosian Camille L | Sale | 2.08K | $68.86K |
| Bedrosian Camille L | Sale | 7.95K | $256.00K |
| FRATES JAMES M | Sale | 1.04K | $34.63K |
Short interest
Settled Sep 30, 2026
- Shares short
- 12.67M
- Days to cover
- 9.16
- % of shares outstanding
- 11.39%
- Average daily volume
- 1.38M
- Change since last report
- −6.3%
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