Amylyx Pharmaceuticals Ownership & Insider Activity

Amylyx Pharmaceuticals (AMLX) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 7.5% of shares outstanding. Institutional investors hold 49.5%. Over the past 90 days, insiders made 6 sales worth $3.5M.

Shares Outstanding

111.086M

Shares Float

85.819M

Insider Shares Owned

9.366M

Insider % Owned

7.5%

Institutional Shares Held

62.164M

Institutional % Held

49.5%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$3.5M total

Net Activity

Net Selling

Net Value (90d)

-$3.5M

Amylyx Pharmaceuticals Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Sep 10, 2026	Camille Bedrosian	CHIEF MEDICAL OFFICER	SELL	10.028K	$32.40	$325K
Sep 10, 2026	JAMES FRATES	CHIEF FINANCIAL OFFICER	SELL	10.810K	$32.36	$350K
Sep 10, 2026	Gina Mazzariello	CHIEF LEGAL OFFICER	SELL	9.536K	$32.46	$310K
Sep 10, 2026	Justin Klee	CO-CHIEF EXECUTIVE OFFICER	SELL	30.464K	$32.18	$980K
Sep 10, 2026	Joshua B Cohen	CO-CHIEF EXECUTIVE OFFICER	SELL	30.464K	$32.19	$981K
Jul 9, 2026	Gina Mazzariello	CHIEF LEGAL OFFICER	SELL	30.000K	$17.96	$539K
May 21, 2026	Karen Firestone	—	BUY	3.800K	$13.51	$51K

Date	Member	Party	Chamber	Action	Amount
Oct 12, 2022	Chris Jacobs	R	House	Purchase	$1,001 - $15,000