13F

Stock

Amylyx Pharmaceuticals, Inc.

AMLX · held by 180 managers

Reported value

$1.35B

Holders

180

+1 new · −1 exited

Holders’ est. mark

−$5.28M

Price effect on 10 books still in the name

Largest holder

$199.5M

Fidelity

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
Fidelity16.5M$199.5M—Held
BlackRock, Inc.9.05M$109.4M—Held
PERCEPTIVE ADVISORS LLC8.28M$100.1M—Held
TCG Crossover Management, LLC6.24M$75.4M—Held
Vanguard5.8M$70.1M—Held
Commodore Capital LP5.65M$68.3M—Held
Saturn V Capital Management LP4.5M$54.3M—Held
JANUS HENDERSON GROUP PLC4.47M$54M—Held
First Light Asset Management, LLC3.36M$40.5M—Held
Driehaus Capital Management LLC3.11M$37.6M—Held
ADAGE CAPITAL PARTNERS GP, L.L.C.2.78M$33.5M—Held
GOLDMAN SACHS GROUP INC2.61M$31.6M—Held
MORGAN STANLEY2.36M$28.5M−$2.94MAdded$2M
GEODE CAPITAL MANAGEMENT, LLC2.17M$26.2M—Held
Almitas Capital LLC2.12M$25.6M—Held
State Street2.07M$25M—Held
GREAT POINT PARTNERS LLC1.75M$21.1M—Held
683 Capital Management, LLC1.65M$19.9M—Held
EVENTIDE ASSET MANAGEMENT, LLC1.51M$18.3M—Held
BANK OF AMERICA CORP /DE/1.34M$16.1M−$648.6KAdded$10.3M
DEUTSCHE BANK AG\1.33M$16.1M—Held
FRANKLIN RESOURCES INC1.2M$14.5M—Held
Connor, Clark & Lunn Investment Management Ltd.1M$12.1M—Held
Logos Global Management LP950K$11.5M—Held
NORTHERN TRUST CORP937.8K$11.3M—Held
ADAR1 Capital Management, LLC890.4K$10.8M—Held
Balyasny Asset Management L.P.858.7K$10.4M—Held
Woodline Partners LP845.4K$10.2M—Held
Nantahala Capital Management, LLC835.7K$10.1M—Held
Boxer Capital Management, LLC800K$9.66M−$1.21MCut−$2.57M
DIMENSIONAL FUND ADVISORS LP771.2K$9.32M—Held
CHARLES SCHWAB INVESTMENT MANAGEMENT INC713K$8.61M—Held
STEMPOINT CAPITAL LP565.1K$6.83M—Held
UBS Group AG543.3K$6.56M—Held
Sofinnova Investments, Inc.527.1K$6.37M—Held
SILVERARC CAPITAL MANAGEMENT, LLC506.2K$6.12M—Held
AMERIPRISE FINANCIAL INC502.4K$6.07M—Held
Rock Springs Capital Management LP499.8K$6.04M—Held
FEDERATED HERMES, INC.457.4K$5.53M—Held
Qube Research & Technologies Ltd412.9K$4.99M—Held
Cormorant Asset Management, LP400K$4.83M—Held
Parkman Healthcare Partners LLC381.8K$4.61M—Held
Patient Square Capital LP350K$4.23M—Held
Citadel345K$4.17M—Held
TWO SIGMA INVESTMENTS, LP344.4K$4.16M—Held
Point72 Asset Management, L.P.335K$4.05M—Held
ACUTA CAPITAL PARTNERS, LLC333.3K$4.03M—Held
TWO SIGMA ADVISERS, LP328.4K$3.97M—Held
Alpha Wave Global, LP317.7K$3.84M—Held
BARCLAYS PLC295.2K$3.57M−$445.7KCut−$2.06M
Nuveen, LLC283.9K$3.43M—Held
Tetragon Partners GP Ltd272.8K$3.3M—Held
JANE STREET GROUP, LLC263.2K$3.18M—Held
HighVista Strategies LLC238.8K$2.88M—Held
WELLINGTON MANAGEMENT GROUP LLP225.8K$2.73M—Held
SummitTX Capital, L.P.218.4K$2.64M—Held
Bank of New York Mellon Corp217.3K$2.63M—Held
Aldebaran Capital, LLC198.5K$2.4M—Held
Renaissance Technologies192.5K$2.33M—Held
XTX Topco Ltd189.7K$2.29M—Held
Invesco Ltd.175.9K$2.13M—Held
Swiss National Bank161.7K$1.95M—Held
VOLORIDGE INVESTMENT MANAGEMENT, LLC153.4K$1.85M—Held
WELLS FARGO & COMPANY/MN146.3K$1.77M—Held
Atom Investors LP139.4K$1.68M—Held
BANK OF MONTREAL /CAN/138.5K$1.67M—Held
PFM Health Sciences, LP134.5K$1.63M—Held
Numerai GP LLC112.6K$1.36M—Held
Elmind Capital, LP112K$1.35M—Held
RHUMBLINE ADVISERS99.3K$1.2M—Held
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC98.8K$1.19M—Held
ALPS ADVISORS INC90.2K$1.09M—Held
STATE OF WISCONSIN INVESTMENT BOARD84.1K$1.02M—Held
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM79.1K$955.4K—Held
Campbell & CO Investment Adviser LLC78.8K$951.5K—Held
Squarepoint Ops LLC76.6K$924.9K—Held
D. E. Shaw & Co., Inc.73.2K$884.5K—Held
Legal & General Group Plc72.6K$877.2K—Held
ALLIANCEBERNSTEIN L.P.71.5K$863.7K—Held
SUSQUEHANNA INTERNATIONAL GROUP, LLP68.9K$832.2K—Held
JPMORGAN CHASE & CO66.5K$803.9K—Held
Russell Investments Group, Ltd.65.4K$790.5K—Held
Kennondale Capital Management LLC53.4K$645.4K—Held
Informed Momentum Co LLC53.3K$643.3K—Held
SEI INVESTMENTS CO52.9K$638.5K—Held
MetLife Investment Management, LLC49.7K$599.8K—Held
Trexquant Investment LP48.1K$581.2K—Held
MILLENNIUM MANAGEMENT LLC46.5K$561.2K—Held
Mariner, LLC46.3K$559.9K—Held
PSP Research LLC44.2K$534.2K—Held
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.41.2K$497.3K—Held
CITIGROUP INC38K$459.4K—Held
Zurcher Kantonalbank (Zurich Cantonalbank)35.9K$433.4K—Held
FOX RUN MANAGEMENT, L.L.C.35.4K$427.7K—Held
INTECH INVESTMENT MANAGEMENT LLC32K$386.6K—Held
Persistent Asset Partners Ltd31.1K$376.3K−$34.6KAdded$64.9K
Headlands Technologies LLC30.5K$369K—Held
Verition Fund Management LLC29.5K$356.2K—Held
Icahn Capital27.8K$336.4K—Held
Integrated Quantitative Investments LLC27.2K$329K—Held
MANUFACTURERS LIFE INSURANCE COMPANY, THE27K$326K—Held
GUGGENHEIM CAPITAL LLC25.2K$304.9K—Held
BNP PARIBAS FINANCIAL MARKETS25.2K$304.4K—Held
Aquatic Capital Management LLC24.4K$294.2K—Held
Police & Firemen's Retirement System of New Jersey23.8K$286.9K—Held
ARIZONA STATE RETIREMENT SYSTEM22.9K$276.8K—Held
TUDOR INVESTMENT CORP ET AL22.4K$270.6K—New
NEW YORK STATE COMMON RETIREMENT FUND21.9K$264.6K—Held
PARSONS CAPITAL MANAGEMENT INC/RI21.6K$261.5K—Held
ProShare Advisors LLC21.1K$254.5K—Held
Schonfeld Strategic Advisors LLC21.1K$254.3K—Held
Vanguard Personalized Indexing Management, LLC20.8K$251.7K—Held
PROFUND ADVISORS LLC20.6K$248.7K—Held
Virtus Investment Advisers, LLC20.3K$245.3K—Held
Premier Path Wealth Partners, LLC20.3K$244.8K—Held
BROWN ADVISORY INC19.9K$240.8K—Held
Engineers Gate Manager LP18.4K$221.8K—Held
China Universal Asset Management Co., Ltd.17.9K$216.2K—Held
Rafferty Asset Management, LLC17.7K$213.5K—Held
KLP KAPITALFORVALTNING AS17.4K$210.2K—Held
JUPITER ASSET MANAGEMENT LTD15.6K$188.1K—Held
ROYAL BANK OF CANADA15.6K$188K—Held
Quadrature Capital Ltd15.5K$186.8K—Held
VOYA INVESTMENT MANAGEMENT LLC15.2K$184.2K—Held
Valeo Financial Advisors, LLC15K$181.2K—Held
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.12.2K$147.7K—Held
TEACHER RETIREMENT SYSTEM OF TEXAS12.2K$147.1K—Held
Seven Fleet Capital Management LP11.6K$139.8K—Held
VICTORY CAPITAL MANAGEMENT INC10.6K$127.5K—Held
EntryPoint Capital, LLC10.5K$126.7K—Held
ACT CAPITAL MANAGEMENT, LLC9K$108.7K—Held
Tower Research Capital LLC (TRC)8.1K$97.8K—Held
Ameritas Investment Partners, Inc.7.2K$87K—Held
AlphaQuest LLC7.2K$86.9K—Held
Walleye Capital LLC5.74K$69.3K—Held
Mirae Asset Global Investments Co., Ltd.5.34K$64.5K—Held
Caitong International Asset Management Co., Ltd3.86K$46.6K—Held
SIMPLEX TRADING, LLC3.73K$45K—Held
STRS OHIO3.4K$41.1K—Held
Walleye Trading LLC2.83K$34.1K—Held
Arax Advisory Partners2.55K$30.8K—Held
LORING WOLCOTT & COOLIDGE FIDUCIARY ADVISORS LLP/MA1.8K$27.9K—Held
GF FUND MANAGEMENT CO. LTD.2.16K$26.1K—Held
MEEDER ASSET MANAGEMENT INC2.1K$25.4K—Held
US BANCORP \DE\2K$24.2K—Held
Sterling Capital Management LLC1.63K$19.7K—Held
Steward Partners Investment Advisory, LLC1.5K$18.1K—Held
State of Wyoming1.38K$16.7K—Held
LOS ANGELES CAPITAL MANAGEMENT LLC852$12K—Held
NISA INVESTMENT ADVISORS, LLC922$11.1K—Held
Westfuller Advisors, LLC819$9.89K—Held
Dunhill Financial, LLC600$7.25K—Held
PNC Financial Services Group, Inc.438$5.29K—Held
Physician Wealth Advisors, Inc.274$3.31K—Held
GAMMA Investing LLC267$3.23K—Held
Rockefeller Capital Management L.P.261$3.15K—Held
ACADIAN ASSET MANAGEMENT LLC254.3K$3.07K—Held
OSAIC HOLDINGS, INC.249$3.01K—Held
EVOLUTION WEALTH MANAGEMENT INC.165$1.99K−$249Cut−$249
MassMutual Private Wealth & Trust, FSB153$1.85K—Held
J.Safra Asset Management Corp123$1.49K—Held
PRICE T ROWE ASSOCIATES INC /MD/107.5K$1.3K—Held
HARBOUR INVESTMENTS, INC.90$1.09K—Held
Catherine Avery Investment Management LLC87$1.05K−$131Cut−$131
Larson Financial Group LLC41$495—Held
GSA CAPITAL PARTNERS LLP36.8K$444—Held
JONES FINANCIAL COMPANIES LLLP30$362—Held
FINANCIAL CONSULATE, INC25$302—Held
EverSource Wealth Advisors, LLC25$302—Held
SG Americas Securities, LLC20.8K$252—Held
Farther Finance Advisors, LLC20$242—Held
Essential Partners LLC17$205−$24Cut−$12
Allworth Financial LP12$145−$19Cut−$19
T. Rowe Price Investment Management, Inc.4.52K$55—Held
AMALGAMATED BANK2.79K$34—Held
BNP PARIBAS ASSET MANAGEMENT Holding S.A.1.31K$16—Held
CWM, LLC1.19K$14—Held
IFP Advisors, Inc1$12−$2Cut−$2
SBI Securities Co., Ltd.1$12—Held
Daiwa Securities Group Inc.266$3—Held

Who left

Positions as of Q4 2025. 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.