Amylyx Pharmaceuticals Ownership | Who Owns Amylyx Pharmaceuticals?

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Amylyx Pharmaceuticals Ownership Summary

Amylyx Pharmaceuticals is owned by 104.55% institutional investors, 7.87% insiders. Fmr is the largest institutional shareholder, holding 15.13% of AMLX shares. Vanguard MStar Total Stk Mkt Idx Invest is the top mutual fund, with 2.85% of its assets in Amylyx Pharmaceuticals shares.

AMLX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Amylyx Pharmaceuticals	104.55%	7.87%	-12.43%
Sector	Healthcare Stocks	50.62%	12.41%	36.97%
Industry	Biotech Stocks	49.15%	12.15%	38.70%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	16.73M	15.13%	$300.43M
Blackrock funding, inc. /de	8.83M	7.98%	$158.53M
Perceptive advisors	8.33M	7.54%	$149.69M
Vanguard group	5.80M	6.22%	$70.12M
Tcg crossover management	6.24M	5.65%	$112.14M
Janus henderson group	4.99M	5.27%	$69.26M
Commodore capital lp	5.65M	5.11%	$101.47M
Saturn v capital management	4.62M	4.18%	$83.05M
Blackrock	2.67M	3.93%	$5.07M
Vanguard capital management	4.22M	3.82%	$75.87M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Saturn v capital management	4.62M	11.91%	$83.05M
Allostery investments lp	120.12K	9.81%	$769.96K
Commodore capital lp	5.65M	6.04%	$101.47M
Almitas capital	974.88K	4.20%	$17.51M
Ally bridge group (ny)	437.39K	3.62%	$5.94M
First light asset management	3.02M	3.30%	$54.30M
Tcg crossover management	6.24M	2.70%	$112.14M
Aldebaran capital	195.89K	2.64%	$3.52M
Great point partners	700.00K	2.38%	$12.57M
Perceptive advisors	8.33M	2.25%	$149.69M

Top Buyers

Holder	Shares	% Assets	Change
Paradigm biocapital advisors lp	1.90M	0.73%	1.90M
Jpmorgan chase	1.86M	0.00%	1.70M
Alyeska investment group	1.05M	0.05%	1.05M
Morgan stanley	3.13M	0.00%	955.26K
Abrdn	737.67K	0.02%	737.67K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock	2.67M	0.00%	-1.80M
Adage capital partners gp	1.90M	0.05%	-1.66M
Boxer capital	-	-	-1.50M
Farallon capital management	-	-	-1.15M
Almitas capital	974.88K	4.20%	-1.15M

New Positions

Holder	Shares	% Assets	Change	Value
Paradigm biocapital advisors lp	1.90M	0.73%	1.90M	$25.82M
Alyeska investment group	1.05M	0.05%	1.05M	$18.91M
Abrdn	737.67K	0.02%	737.67K	$13.25M
Sixth street partners management company	725.03K	0.00%	725.03K	$13.02M
Braidwell lp	612.84K	0.25%	612.84K	$8.33M

Sold Out

Holder	Change
Ifp advisors	-1.00
Ameritas advisory services	-3.00
Nelson, van denburg & campbell wealth management group	-10.00
Financial consulate	-25.00
Kelly financial services	-33.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	220	21.55%	115,598,683	1.27%	104	0.98%	123	35.16%	59	9.26%
Mar 31, 2026	67	-64.74%	11,342,671	-89.90%	11	0.08%	27	-75.23%	25	-46.81%
Dec 31, 2025	114	-35.23%	37,817,895	-65.53%	40	0.27%	65	-38.10%	25	-46.81%
Sep 30, 2025	170	34.92%	109,563,434	39.61%	122	1.59%	101	46.38%	46	43.75%
Jun 30, 2025	131	-2.96%	81,652,437	17.21%	91	1.39%	70	-12.50%	35	12.90%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard MStar Total Stk Mkt Idx Invest	3.17M	2.85%	18.18K
Vanguard Total Stock Mkt Idx Inv	3.15M	2.84%	36.90K
Vanguard Morn Total Stk Mkt Idx Investor	3.15M	2.84%	36.90K
Fidelity Advisor Biotechnology I	2.43M	2.19%	-
iShares Russell 2000 ETF	2.32M	2.08%	-41.28K
Fidelity Small Cap Growth	2.12M	1.90%	-
Eventide Healthcare & Life Sciences I	1.51M	1.36%	-
Fidelity Select Health Care	1.42M	1.28%	-
Franklin Biotechnology Discv A(acc)USD	1.39M	1.25%	61.02K
Fidelity Stock Selector Small Cap	1.26M	1.13%	8.18K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jul 09, 2026	Mazzariello Gina	Chief Legal Officer	Sell	$274.75K
Jul 10, 2026	Mazzariello Gina	Chief Legal Officer	Sell	$264.12K
May 21, 2026	Firestone Karen	-	Buy	$51.34K
Mar 02, 2026	Klee Justin B.	Co-Chief Executive Officer	Sell	$423.76K
Mar 02, 2026	Cohen Joshua B	Co-Chief Executive Officer	Sell	$424.12K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	2
2026 Q2	1	-
2026 Q1	-	17
2025 Q4	1	1
2025 Q3	-	9

AMLX Ownership FAQ

Who Owns Amylyx Pharmaceuticals?

Amylyx Pharmaceuticals shareholders are primarily institutional investors at 104.55%, followed by 7.87% insiders and -12.42% retail investors. The average institutional ownership in Amylyx Pharmaceuticals's industry, Biotech Stocks , is 49.15%, which Amylyx Pharmaceuticals exceeds.

Who owns the most shares of Amylyx Pharmaceuticals?

Amylyx Pharmaceuticals’s largest shareholders are Fmr (16.73M shares, 15.13%), Blackrock funding, inc. /de (8.83M shares, 7.98%), and Perceptive advisors (8.33M shares, 7.54%). Together, they hold 30.65% of Amylyx Pharmaceuticals’s total shares outstanding.

Does Blackrock own Amylyx Pharmaceuticals?

Yes, BlackRock owns 3.93% of Amylyx Pharmaceuticals, totaling 2.67M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 5.07M$. In the last quarter, BlackRock decreased its holdings by -1.805M shares, a -40.34% change.

Who is Amylyx Pharmaceuticals’s biggest shareholder by percentage of total assets invested?

Saturn v capital management is Amylyx Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 11.91% of its assets in 4.62M Amylyx Pharmaceuticals shares, valued at 83.05M$.

Who is the top mutual fund holder of Amylyx Pharmaceuticals shares?

Vanguard MStar Total Stk Mkt Idx Invest is the top mutual fund holder of Amylyx Pharmaceuticals shares, with 2.85% of its total shares outstanding invested in 3.17M Amylyx Pharmaceuticals shares.

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