13F

Stock

Amylyx Pharmaceuticals, Inc.

AMLX · held by 171 managers

Reported value

$1.58B

Holders

171

+21 new · −36 exited

Holders’ est. mark

$179.9M

Price effect on 143 books still in the name

Largest holder

$231.2M

Fidelity

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
Fidelity16.6M$231.2M$30.1MAdded$31.6M
BlackRock, Inc.8.83M$122.7M$16.1MAdded$13.3M
PERCEPTIVE ADVISORS LLC8.28M$115.2M$15.1MAdded$15.1M
TCG Crossover Management, LLC6.24M$86.8M$11.4MAdded$11.4M
Commodore Capital LP5.65M$78.5M$10.3MAdded$10.3M
JANUS HENDERSON GROUP PLC4.99M$69.3M$8.04MAdded$15.3M
Saturn V Capital Management LP4.35M$60.5M$7.92MAdded$6.15M
VANGUARD CAPITAL MANAGEMENT LLC4.14M$57.6MHeld
ADAGE CAPITAL PARTNERS GP, L.L.C.3.56M$49.5M$5.05MAdded$15.9M
First Light Asset Management, LLC3.19M$44.3M$5.81MAdded$3.82M
Driehaus Capital Management LLC2.99M$41.5M$5.44MAdded$3.96M
GOLDMAN SACHS GROUP INC2.63M$36.5M$4.76MAdded$4.93M
State Street2.36M$32.8M$3.77MAdded$7.84M
FRANKLIN RESOURCES INC2.26M$31.4M$2.18MAdded$16.9M
GEODE CAPITAL MANAGEMENT, LLC2.21M$30.7M$3.94MAdded$4.57M
MORGAN STANLEY2.18M$30.2M$3.96MAdded$1.73M
Almitas Capital LLC2.12M$29.5M$3.86MAdded$3.86M
GREAT POINT PARTNERS LLC1.75M$24.3M$3.19MAdded$3.19M
Jones Hill Capital LP1.6M$22.2MHeld
683 Capital Management, LLC1.53M$21.3M$2.78MAdded$1.33M
EVENTIDE ASSET MANAGEMENT, LLC1.51M$21M$2.75MAdded$2.76M
BANK OF AMERICA CORP /DE/1.33M$18.5M$2.42MAdded$2.36M
DEUTSCHE BANK AG\1.27M$17.6M$2.31MAdded$1.52M
Siren, L.L.C.1.23M$17.1MNew
Balyasny Asset Management L.P.1.11M$15.4M$1.56MAdded$5.02M
ADAR1 Capital Management, LLC1M$13.9M$1.62MAdded$3.15M
BARCLAYS PLC971.9K$13.5M$537.2KAdded$9.94M
VANGUARD PORTFOLIO MANAGEMENT LLC944.8K$13.1MHeld
DIMENSIONAL FUND ADVISORS LP903.2K$12.5M$1.4MAdded$3.23M
Connor, Clark & Lunn Investment Management Ltd.868.3K$12.1M$1.58MCut−$58.9K
Woodline Partners LP845.8K$11.8M$1.54MAdded$1.54M
Boxer Capital Management, LLC800K$11.1M$1.46MAdded$1.46M
NORTHERN TRUST CORP779.9K$10.8M$1.42MCut−$487.5K
CHARLES SCHWAB INVESTMENT MANAGEMENT INC716.2K$9.96M$1.3MAdded$1.34M
Qube Research & Technologies Ltd702.2K$9.76M$751.4KAdded$4.77M
Logos Global Management LP700K$9.73M$1.27MCut−$1.75M
STEMPOINT CAPITAL LP669.7K$9.31M$1.03MAdded$2.48M
Parkman Healthcare Partners LLC621.5K$8.64M$694.8KAdded$4.03M
JUPITER ASSET MANAGEMENT LTD592.7K$8.24M$28.3KAdded$8.05M
VANGUARD FIDUCIARY TRUST CO586.2K$8.15MHeld
Nantahala Capital Management, LLC535.7K$7.45M$974.9KCut−$2.65M
Rock Springs Capital Management LP499.8K$6.95M$909.6KAdded$909.6K
Citadel411.5K$5.72M$627.8KAdded$1.55M
FEDERATED HERMES, INC.363.5K$5.05M$661.7KCut−$472.2K
HighVista Strategies LLC352.1K$4.89M$434.6KAdded$2.01M
Cormorant Asset Management, LP350K$4.87M$637KAdded$33K
UBS Group AG324.3K$4.51M$590.3KCut−$2.06M
Tetragon Partners GP Ltd317.9K$4.42M$496.5KAdded$1.12M
Nuveen, LLC264.9K$3.68M$482.1KAdded$252K
Bank of New York Mellon Corp251.1K$3.49M$395.6KAdded$864.8K
WELLINGTON MANAGEMENT GROUP LLP241.6K$3.36M$410.9KAdded$630.1K
SummitTX Capital, L.P.227K$3.16M$397.5KAdded$517.2K
Aldebaran Capital, LLC197.9K$2.75M$360.2KAdded$352.7K
Invesco Ltd.171.6K$2.39M$312.3KAdded$260.5K
TWO SIGMA INVESTMENTS, LP161.9K$2.25M$294.7KCut−$1.91M
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC157.1K$2.18M$179.9KAdded$989.6K
ACUTA CAPITAL PARTNERS, LLC151.1K$2.1M$274.9KCut−$1.93M
JPMORGAN CHASE & CO159.7K$2.04M$45.3KAdded$1.23M
PFM Health Sciences, LP145.3K$2.02M$244.9KAdded$394K
Alpha Wave Global, LP142.3K$1.98M$259.1KCut−$1.86M
Swiss National Bank130.3K$1.81M$237.1KCut−$142.2K
Squarepoint Ops LLC114.9K$1.6M$139.3KAdded$671.9K
Elmind Capital, LP112K$1.56M$203.8KAdded$203.8K
RHUMBLINE ADVISERS108.5K$1.51M$180.7KAdded$308.5K
Point72 Asset Management, L.P.106.5K$1.48M$193.9KCut−$2.57M
ALPS ADVISORS INC90K$1.25M$163.8KAdded$161.5K
SEI INVESTMENTS CO85.3K$1.19M$96.2KAdded$546.9K
Schonfeld Strategic Advisors LLC77.8K$1.08M$38.3KAdded$827K
WELLS FARGO & COMPANY/MN75.1K$1.04M$136.7KCut−$723.8K
D. E. Shaw & Co., Inc.74.2K$1.03M$133.3KAdded$147.3K
STATE OF WISCONSIN INVESTMENT BOARD72.1K$1M$131.2KCut−$14.8K
ALLIANCEBERNSTEIN L.P.80.8K$976.1K$0Added$112.3K
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM65K$903.5K$118.3KCut−$51.9K
Walleye Capital LLC61.7K$857.8K$10.4KAdded$788.4K
Russell Investments Group, Ltd.59.3K$824.9K$108KAdded$34.4K
Legal & General Group Plc55.8K$775.2K$101.5KCut−$101.9K
Campbell & CO Investment Adviser LLC54.4K$756.5K$99KCut−$195K
Informed Momentum Co LLC53.3K$740.3K$96.9KAdded$96.9K
MetLife Investment Management, LLC51.6K$717.1K$90.4KAdded$117.2K
Maven Securities LTD50K$695KNew
Numerai GP LLC48.6K$674.9K$88.4KCut−$685.9K
Vanguard Global Advisers, LLC47.9K$665.1KHeld
VANGUARD ASSET MANAGEMENT, Ltd43.3K$601.6KHeld
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.42.6K$591.5K$74.9KAdded$94.2K
Zurcher Kantonalbank (Zurich Cantonalbank)40.8K$567K$65.3KAdded$133.6K
SUSQUEHANNA INTERNATIONAL GROUP, LLP39.8K$553.2K$72.4KCut−$279K
MANUFACTURERS LIFE INSURANCE COMPANY, THE38.8K$539.1K$49.1KAdded$213K
Optimize Financial Inc32K$444.8KNew
CITIGROUP INC31.8K$441.8K$57.8KCut−$17.7K
TUDOR INVESTMENT CORP ET AL31.3K$435.5K$40.8KAdded$164.9K
Icahn Capital29.1K$404.3K$50.7KAdded$67.9K
Integrated Quantitative Investments LLC27.2K$378.6K$49.6KAdded$49.6K
GUGGENHEIM CAPITAL LLC25.5K$354.6K$45.9KAdded$49.7K
INTECH INVESTMENT MANAGEMENT LLC24.9K$346.4K$45.4KCut−$40.2K
Vanguard Personalized Indexing Management, LLC24.1K$334.6K$37.9KAdded$82.9K
Police & Firemen's Retirement System of New Jersey23.8K$330.2K$43.2KAdded$43.2K
State of New Jersey Common Pension Fund D22.5K$313KNew
NEW YORK STATE COMMON RETIREMENT FUND21.9K$304.4K$39.9KAdded$39.9K
PARSONS CAPITAL MANAGEMENT INC/RI21.6K$300.9K$39.4KAdded$39.4K
BNP PARIBAS FINANCIAL MARKETS21.1K$293.8K$38.5KCut−$10.6K
Virtus Investment Advisers, LLC20.8K$289.3K$37KAdded$44K
Premier Path Wealth Partners, LLC20.3K$281.7K$36.9KAdded$36.9K
BROWN ADVISORY INC19.9K$277K$36.3KAdded$36.3K
Headlands Technologies LLC19.8K$275.4K$36.1KCut−$93.5K
China Universal Asset Management Co., Ltd.19.5K$270.9K$32.6KAdded$54.7K
ProShare Advisors LLC18.2K$252.3K$33KCut−$2.16K
ARIZONA STATE RETIREMENT SYSTEM18.1K$251.6K$32.9KCut−$25.2K
Creative Planning17.9K$248.6KNew
Vanguard Investments Australia, Ltd.17.7K$246.2KHeld
KLP KAPITALFORVALTNING AS17.4K$241.9K$31.7KAdded$31.7K
PROFUND ADVISORS LLC17.2K$238.4K$31.2KCut−$10.3K
Seven Fleet Capital Management LP16.7K$231.7K$21.1KAdded$91.9K
VOYA INVESTMENT MANAGEMENT LLC15.2K$211.7K$27.7KAdded$27.5K
PRUDENTIAL FINANCIAL INC14.1K$196.3KNew
Verition Fund Management LLC13.3K$184.4K$24.1KCut−$171.8K
Amundi12.9K$179.2KNew
ROYAL BANK OF CANADA12.4K$172K$23.2KCut−$16K
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.12.2K$169.9K$22.3KAdded$22.3K
HSBC HOLDINGS PLC11.4K$156.9KNew
PSP Research LLC10.8K$150.6K$19.7KCut−$383.6K
Pictet Asset Management Holding SA10.8K$149.7KNew
VICTORY CAPITAL MANAGEMENT INC10.6K$148K$19.2KAdded$20.5K
GREAT LAKES ADVISORS, LLC10.4K$144.3KNew
Valeo Financial Advisors, LLC10K$139K$18.2KCut−$42.2K
MAI Capital Management9.01K$125.3KNew
ACT CAPITAL MANAGEMENT, LLC9K$125.1K$16.4KAdded$16.4K
Tower Research Capital LLC (TRC)7.91K$110K$14.4KAdded$12.2K
Ameritas Investment Partners, Inc.7.2K$100.1K$13.1KAdded$13.1K
Mirae Asset Global Investments Co., Ltd.5.73K$79.6K$9.71KAdded$15.1K
STRS OHIO3.4K$47.3K$6.19KAdded$6.19K
GF FUND MANAGEMENT CO. LTD.2.46K$34.1K$3.93KAdded$8.06K
LORING WOLCOTT & COOLIDGE FIDUCIARY ADVISORS LLP/MA1.8K$29.5K$1.6KAdded$1.6K
US BANCORP \DE\2.06K$28.7K$3.64KAdded$4.52K
State of Wyoming1.88K$26.2K$2.51KAdded$9.49K
Arax Advisory Partners1.49K$20.8K$2.72KCut−$10K
BNP PARIBAS ASSET MANAGEMENT Holding S.A.1.42K$19.7K$18.3KAdded$19.7K
Rockefeller Capital Management L.P.1.27K$17.7K$476Added$14.6K
CWM, LLC1.26K$17.6K$16.6KAdded$17.5K
Sterling Capital Management LLC1.14K$15.8K$2.07KCut−$3.85K
Steward Partners Investment Advisory, LLC1K$13.9K$1.82KCut−$4.22K
NISA INVESTMENT ADVISORS, LLC922$12.8K$1.68KAdded$1.68K
Westfuller Advisors, LLC819$11.4K$1.49KAdded$1.49K
FIFTH THIRD BANCORP755$10.5KNew
MEEDER ASSET MANAGEMENT INC661$9.19K$1.2KCut−$16.2K
Dunhill Financial, LLC600$8.34K$1.09KAdded$1.09K
OSAIC HOLDINGS, INC.528$7.34K$454Added$4.33K
GAMMA Investing LLC417$5.8K$486Added$2.57K
J.Safra Asset Management Corp377$5.24K$224Added$3.75K
LOS ANGELES CAPITAL MANAGEMENT LLC325$4.52K−$48Cut−$7.45K
iA Global Asset Management Inc.304.8K$4.24KNew
PNC Financial Services Group, Inc.283$3.93K$515Cut−$1.36K
MassMutual Private Wealth & Trust, FSB282$3.92K$279Added$2.07K
Physician Wealth Advisors, Inc.274$3.81K$499Added$499
JONES FINANCIAL COMPANIES LLLP270$3.66K$45Added$3.3K
SIGNATUREFD, LLC254$3.53KNew
Larson Financial Group LLC201$2.79K$75Added$2.3K
EASTERN BANK200$2.78KNew
PRICE T ROWE ASSOCIATES INC /MD/121.4K$1.69K$196Added$389
HARBOUR INVESTMENTS, INC.90$1.25K$164Added$164
Stone House Investment Management, LLC73$1.01KNew
SALEM INVESTMENT COUNSELORS INC55$765New
ROTHSCHILD INVESTMENT LLC55$765New
Allworth Financial LP40$556$22Added$411
Caitong International Asset Management Co., Ltd36$500$65Cut−$46.1K
EverSource Wealth Advisors, LLC26$361$45Added$59
Farther Finance Advisors, LLC22$316$45Added$74
Essential Partners LLC15$209$28Added$4
Ameritas Advisory Services, LLC3$42New
KBC Group NV1.86K$26New
SBI Securities Co., Ltd.1$14$2Added$2
Covestor Ltd9$0New

Who left

Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.