AMLX
Amylyx Pharmaceuticals, Inc.
NASDAQ · Healthcare · Biotechnology · US
$32.41
−4.51%0
Insider buys (3m)
11
Insider sells (3m)
-$3.2M
Net value (3m)
+100.9%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Sep 14, 2026 | Mazzariello Gina · officer: Chief Legal Officer | Sale | 9,525 | $32 |
| Sep 14, 2026 | Klee Justin B. · director, officer: Co-Chief Executive Officer | Sale | 29,025 | $32 |
| Sep 14, 2026 | Klee Justin B. · director, officer: Co-Chief Executive Officer | Sale | 1,439 | $33 |
| Sep 14, 2026 | Cohen Joshua B · director, officer: Co-Chief Executive Officer | Sale | 29,545 | $32 |
| Sep 14, 2026 | Cohen Joshua B · director, officer: Co-Chief Executive Officer | Sale | 919 | $33 |
| Sep 14, 2026 | Bedrosian Camille L · officer: Chief Medical Officer | Sale | 2,081 | $33 |
| Sep 14, 2026 | Bedrosian Camille L · officer: Chief Medical Officer | Sale | 7,947 | $32 |
| Sep 14, 2026 | Mazzariello Gina · officer: Chief Legal Officer | Sale | 11 | $33 |
| Sep 14, 2026 | FRATES JAMES M · officer: Chief Financial Officer | Sale | 9,768 | $32 |
| Sep 14, 2026 | FRATES JAMES M · officer: Chief Financial Officer | Sale | 1,042 | $33 |
| Sep 2, 2026 | Firestone Karen · director | M-Exempt | 25,000 | $1.76 |
| Aug 20, 2026 | Mazzariello Gina · officer: Chief Legal Officer | A-Award | 21,284 | $0.00 |
| Aug 20, 2026 | Cohen Joshua B · director, officer: Co-Chief Executive Officer | A-Award | 60,039 | $0.00 |
| Aug 20, 2026 | Bedrosian Camille L · officer: Chief Medical Officer | A-Award | 22,807 | $0.00 |
| Aug 20, 2026 | Klee Justin B. · director, officer: Co-Chief Executive Officer | A-Award | 60,039 | $0.00 |
| Aug 20, 2026 | FRATES JAMES M · officer: Chief Financial Officer | A-Award | 22,807 | $0.00 |
| Jul 13, 2026 | Mazzariello Gina · officer: Chief Legal Officer | Sale | 15,000 | $18 |
| Jun 8, 2026 | Zeiher Bernhardt G · director | A-Award | 24,372 | $14 |
| Jun 8, 2026 | Firestone Karen · director | A-Award | 24,372 | $14 |
| Jun 8, 2026 | MILNE GEORGE M JR · director | A-Award | 24,372 | $14 |
| Jun 8, 2026 | FONTEYNE PAUL R. · director | A-Award | 24,372 | $14 |
| Jun 8, 2026 | Quimi Daphne · director | A-Award | 24,372 | $14 |
| May 26, 2026 | Firestone Karen · director | Purchase | 3,800 | $14 |
| Mar 9, 2026 | Mazzariello Gina · officer: Chief Legal Officer | A-Award | 111,990 | $14 |
| Mar 9, 2026 | FRATES JAMES M · officer: Chief Financial Officer | A-Award | 95,990 | $0.00 |
| Mar 9, 2026 | FRATES JAMES M · officer: Chief Financial Officer | A-Award | 143,985 | $14 |
| Mar 9, 2026 | Klee Justin B. · director, officer: Co-Chief Executive Officer | A-Award | 248,865 | $0.00 |
| Mar 9, 2026 | Klee Justin B. · director, officer: Co-Chief Executive Officer | A-Award | 373,295 | $14 |
| Mar 9, 2026 | Bedrosian Camille L · officer: Chief Medical Officer | A-Award | 95,990 | $0.00 |
| Mar 9, 2026 | Bedrosian Camille L · officer: Chief Medical Officer | A-Award | 143,985 | $14 |
Institutional positioning
13F filings over the trailing two quarters
New 79Increased 137Reduced 115Sold out 13
| Filer | Action | Shares | Filed |
|---|---|---|---|
| FMR LLC | Increased | 16,727,909 | Aug 13, 2026 |
| FMR LLC | Increased | 16,630,541 | May 15, 2026 |
| BLACKROCK, INC. | Reduced | 8,828,836 | May 13, 2026 |
| BlackRock, Inc. | Reduced | 8,827,085 | Aug 7, 2026 |
| PERCEPTIVE ADVISORS LLC | Increased | 8,334,882 | Aug 14, 2026 |
| PERCEPTIVE ADVISORS LLC | Unchanged | 8,284,882 | May 29, 2026 |
| TCG CROSSOVER MANAGEMENT, LLC | Unchanged | 6,243,812 | May 15, 2026 |
| TCG Crossover Management, LLC | Unchanged | 6,243,812 | Aug 14, 2026 |
| Commodore Capital LP | Unchanged | 5,650,000 | Aug 14, 2026 |
| COMMODORE CAPITAL LP | Unchanged | 5,650,000 | May 15, 2026 |
| Jupiter Topco LLC | New Position | 5,236,102 | Aug 14, 2026 |
| JANUS HENDERSON GROUP PLC | Increased | 4,986,073 | May 18, 2026 |
| Saturn V Capital Management LP | Increased | 4,624,101 | Aug 14, 2026 |
| SATURN V CAPITAL MANAGEMENT LLC | Reduced | 4,349,885 | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 4,224,224 | Aug 13, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Sep 14, 2026