Adage Capital Management, L.P. - 30 Sep 2025 SCHEDULE 13G/A Report for Amylyx Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share (AMLX)

Filing Manager
Adage Capital Management, L.P.
Reporting Manager
Adage Capital Management, L.P.
Security
Amylyx Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share
Symbol
AMLX
Shares outstanding
106,679,624 shares
Disclosed Ownership
6,816,828 shares
Ownership
6.4%
Form type
SCHEDULE 13G/A
Filing time
13 Nov 2025, 09:05:44 UTC
Date of event
30 Sep 2025
Previous filing
12 Aug 2025
Next filing
12 Feb 2026
SEC
View on sec.gov

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Quoteable Key Fact

"Adage Capital Management, L.P. disclosed 6.4% ownership in Amylyx Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share (AMLX) on 30 Sep 2025."

Quick Takeaways

  • Adage Capital Management, L.P. filed SCHEDULE 13G/A for Amylyx Pharmaceuticals, Inc. Common Stock, $0.0001 par value per share (AMLX).
  • Disclosed ownership: 6.4%.
  • Date of event: 30 Sep 2025.

What Changed

  • Previous schedule filing date: 12 Aug 2025.
  • Current filing was accepted on 13 Nov 2025, 09:05.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Adage Capital Management, L.P. 6.4% 6,816,828 0 6,816,828 /s/ Robert Atchinson By: Adage Capital Partners LLC, its General Partner, By: Robert Atchinson, its Managing Member
Robert Atchinson 6.4% 6,816,828 0 6,816,828 /s/ Robert Atchinson Robert Atchinson, individually
Phillip Gross 6.4% 6,816,828 0 6,816,828 /s/ Phillip Gross Phillip Gross, individually

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