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Disclosery

AMPH AMPHASTAR PHARMACEUTICALS IN

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COM (common), issuer CIK 1297184

237 managers (243 13F filers) reported a position in AMPH shares at 2025-09-30, 32,747,448 shares in all. 34 filers opened a position and 34 filers sold out during the quarter.

Managers
237
13F filers
243
New
34
Added
82
Reduced
92
Sold out
34
Shares held by filers
32,747,448

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.5,485,057$146M<0.01%-183,73613F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding2,642,044$70.4M-57,530Timeline
TD Asset Management Inc1,931,892$51.5M0.04%-103,03813F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP1,755,665$46.8M0.01%+128,78113F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,500,742$40M<0.01%-75,49113F-HRTimelineGroup
FULLER & THALER ASSET MANAGEMENT, INC.1,353,927$36.1M0.12%+90,15513F-HRTimeline
Boston Trust Walden Corpin group Boston Trust Walden Corp1,173,107$31.3M0.23%-3,34613F-HRTimelineGroup
Epoch Investment Partners, Inc.1,133,986$30.2M0.17%-107,38313F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC922,577$24.6M<0.01%-50,66013F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP874,068$23.3M0.03%+25,38313F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC697,765$18.6M0.01%+78,78113F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC586,900$15.6M0.02%+10,40013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY574,679$15.3M<0.01%-106,54313F-HR/ATimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.517,222$13.8M0.01%+223,29413F-HRTimelineGroup
SYSTEMATIC FINANCIAL MANAGEMENT LP423,112$11.3M0.27%+63,80513F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP399,470$10.6M<0.01%-21,66613F-HRTimelineGroup
ALGERT GLOBAL LLC392,902$10.5M0.18%+268,61213F-HR/ATimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …392,310$10.5M0.01%+311,07113F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.389,593$10.4M<0.01%+2,62213F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding366,609$9.77M+206,123Timeline
ROYCE & ASSOCIATES LP366,322$9.76M0.1%+83,13513F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co356,409$9.5M<0.01%+9,62513F-HRTimelineGroup
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC326,183$8.69M0.03%-39,73713F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC312,337$8.32M0.18%+227,22513F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC292,443$7.79M0.03%-33,06913F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC288,585$7.69M<0.01%+55,42413F-HRTimelineGroup
Clark Capital Management Group, Inc.283,674$7.56M0.05%new13F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/275,222$7.34M<0.01%+1,93413F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp267,828$7.14M<0.01%-46,97513F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO253,232$6.75M<0.01%+95,11813F-HR/ATimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC241,228$6.43M<0.01%-115,02213F-HRTimelineGroup
Qube Research & Technologies Ltd241,212$6.43M0.01%-228,28013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC226,775$6.04M<0.01%-65,57013F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS222,019$5.92M<0.01%+150,33013F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC211,800$5.64M<0.01%+134,93813F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding207,282$5.52M-11,778Timeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …153,351$4.09M<0.01%+1,33613F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP150,422$4.01M<0.01%+56,11713F-HRTimelineGroup
Empowered Funds, LLC149,795$3.99M0.04%+64,68313F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC148,459$3.96M<0.01%-11,62313F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management141,852$3.78M0.01%-124,45413F-HRTimelineGroup
Public Sector Pension Investment Board139,675$3.72M0.01%+14,31213F-HRTimeline
Bridge City Capital, LLC136,258$3.63M0.97%-2,38613F-HRTimeline
DENALI ADVISORS LLC135,000$3.6M0.41%new13F-HRTimeline
LAM GROUP, INC.130,800$3.49M2.16%013F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC129,841$3.46M<0.01%-40,00813F-HRTimelineGroup
RICE HALL JAMES & ASSOCIATES, LLC129,339$3.45M0.19%new13F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/127,097$3.39M<0.01%-18,02813F-HR/ATimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding121,478$3.24M-53,852Timeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC118,187$3.15M<0.01%+1,06813F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc97,614$2.6M<0.01%-3,54013F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND90,169$2.4M<0.01%+41,80013F-HRTimeline
RHUMBLINE ADVISERS90,129$2.4M<0.01%-5,15813F-HRTimeline
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.89,233$2.38M0.02%new13F-HRTimelineGroup
HRT FINANCIAL LP77,746$2.07M0.01%+35,66613F-HRTimeline
Nuveen, LLCin group TIAA77,703$2.07M<0.01%-3,43913F-HRTimelineGroup
LSV ASSET MANAGEMENT73,300$1.95M<0.01%+30,10013F-HRTimeline
Swiss National Bank72,600$1.93M<0.01%013F-HRTimeline
O'SHAUGHNESSY ASSET MANAGEMENT, LLC69,058$1.84M0.01%+28,74913F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC66,494$1.77M<0.01%-15,59313F-HR/ATimelineGroup
CX Institutional63,316$1.69M0.05%-199,96713F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC62,145$1.66M<0.01%-13,70013F-HRTimelineGroup
ASSETMARK, INCin group ASSETMARK, INC56,487$1.51M<0.01%+12,72113F-HRTimelineGroup
SteelPeak Wealth, LLC55,695$1.48M0.05%-10013F-HRTimeline
Creative Planningin group Creative Planning55,115$1.47M<0.01%+12,49513F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 3 filers holding52,132$1.39M-143,583Timeline
INTECH INVESTMENT MANAGEMENT LLC51,160$1.36M0.01%+8913F-HRTimeline
ALLIANCEBERNSTEIN L.P.50,630$1.35M<0.01%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA49,671$1.32M<0.01%-269,04613F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC49,310$1.31M<0.01%+26,28413F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC47,429$1.26M<0.01%+5,47813F-HRTimelineGroup
Quantedge Capital Pte Ltd45,100$1.2M0.66%new13F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC44,349$1.18M<0.01%new13F-HRTimelineGroup
Campbell & CO Investment Adviser LLC44,068$1.17M0.09%+21,63513F-HRTimeline
SummerHaven Investment Management, LLC38,200$1.02M0.59%new13F-HRTimeline
Legato Capital Management LLC36,060$961K0.1%013F-HRTimeline
Arkadios Wealth Advisors36,008$960K0.02%+84513F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…35,879$956K<0.01%+213F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.31,614$892K<0.01%+16,37813F-HRTimelineGroup
Man Group plcin group Man Group plc32,385$863K<0.01%+12,08513F-HRTimelineGroup
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co30,216$813K<0.01%013F-HRTimelineGroup
Quantbot Technologies LP29,763$793K0.02%-31,19213F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN28,751$766K<0.01%+4,35513F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\28,396$757K<0.01%+3,21813F-HRTimelineGroup
Illumine Investment Management, LLC27,677$738K0.53%+55113F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…25,828$688K<0.01%-1,20813F-HRTimelineGroup
Advisor OS, LLCin group Advisor OS, LLC25,405$677K0.06%013F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd25,090$669K0.02%+7,36313F-HRTimeline
NEW YORK STATE TEACHERS RETIREMENT SYST…23,328$622K<0.01%-40413F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…23,093$615K<0.01%013F-HRTimelineGroup
DANSKE BANK A/S23,043$614K<0.01%-6,85513F-HR/ATimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC21,975$586K<0.01%new13F-HRTimelineGroup
Lighthouse Investment Partners, LLCin group Lighthouse Investment Partner…21,600$576K0.02%new13F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD21,334$569K<0.01%-3,99813F-HRTimeline
State of Alaska, Department of Revenue20,788$553K0.01%-1,10413F-HRTimeline
Illinois Municipal Retirement Fund20,747$553K0.01%+81013F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD20,700$552K<0.01%+16,50013F-HRTimeline
DekaBank Deutsche Girozentrale20,848$550K<0.01%013F-HRTimeline
Significant Wealth Partners LLC20,579$548K0.27%+4,40113F-HRTimeline
CITIGROUP INCin group CITIGROUP INC19,815$528K<0.01%-22,40513F-HRTimelineGroup
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding19,040$507K-3,119Timeline
LOS ANGELES CAPITAL MANAGEMENT LLC18,938$505K<0.01%new13F-HRTimeline
MARTINGALE ASSET MANAGEMENT L P18,521$494K0.01%-6,02113F-HRTimeline
Vident Advisory, LLCin group Vident Advisory, LLC18,431$491K<0.01%+1,15213F-HRTimelineGroup
Cynosure Group, LLC17,820$475K0.05%013F-HR/ATimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …17,762$473K<0.01%-92613F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…17,199$458K<0.01%+1,58113F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson16,868$449K<0.01%013F-HRTimelineGroup
Louisiana State Employees Retirement Sy…16,500$440K0.01%-70013F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC16,250$433K<0.01%new13F-HRTimelineGroup
Corient Private Wealth LPin group Corient Private Wealth LP15,723$419K<0.01%new13F-HRTimelineGroup
ADVISORY RESEARCH INC15,468$412K0.05%+57013F-HRTimeline
Gotham Asset Management, LLC15,364$409K<0.01%+1,35013F-HRTimeline
Assenagon Asset Management S.A.15,216$406K<0.01%-1,39413F-HRTimeline
Jackson Creek Investment Advisors LLC14,743$393K0.11%new13F-HRTimeline
LPL Financial LLC14,645$390K<0.01%new13F-HRTimeline
PDT Partners, LLC14,630$390K0.02%013F-HRTimeline
Handelsbanken Fonder AB14,400$384K<0.01%013F-HRTimeline
VIRGINIA RETIREMENT SYSTEMS ET Al13,562$361K<0.01%+4,80013F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…13,489$359K0.01%-35,43113F-HRTimelineGroup
Janney Montgomery Scott LLC13,405$357K<0.01%new13F-HRTimeline
Quantinno Capital Management LP13,260$353K<0.01%+1,99113F-HRTimeline
Polaris Capital Management, LLC13,100$349K0.02%-22,00013F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO11,972$319K<0.01%-70013F-HRTimelineGroup
HOHIMER WEALTH MANAGEMENT, LLC11,972$319K0.04%+12713F-HRTimeline
Sterling Capital Management LLC11,667$311K<0.01%+1,45013F-HRTimeline
CIM, LLC11,628$310K0.04%+19913F-HRTimeline
SEGALL BRYANT & HAMILL, LLC11,185$298K<0.01%013F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM11,145$297K<0.01%+5513F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…10,913$291K<0.01%013F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…10,523$280K<0.01%-1,16813F-HRTimeline
AMALGAMATED BANK10,494$280K<0.01%-5513F-HRTimeline
Police & Firemen's Retirement System of…10,263$274K<0.01%+1,97513F-HRTimeline
EXCHANGE TRADED CONCEPTS, LLC9,985$266K<0.01%+15413F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources9,525$254K<0.01%new13F-HRTimelineGroup
COMERICA BANK9,465$252K<0.01%-2,08813F-HRTimeline
Vestcor Inc9,383$250K0.01%013F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS9,356$249K<0.01%-89513F-HRTimeline
State of Tennessee, Department of Treas…9,300$248K<0.01%013F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC9,273$247K<0.01%-1,80513F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…9,118$243K<0.01%-32213F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/8,968$239K<0.01%-2,82213F-HRTimelineGroup
ProShare Advisors LLC8,626$230K<0.01%-1,41313F-HRTimeline
AlphaQuest LLC8,575$229K0.01%-20,30713F-HRTimeline
MML INVESTORS SERVICES, LLC8,462$226K<0.01%new13F-HRTimeline
PROFUND ADVISORS LLC8,188$218K0.01%-1,45013F-HRTimeline
China Universal Asset Management Co., L…8,150$217K0.02%-1,31813F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND8,042$214K<0.01%-40013F-HRTimeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC7,984$213K<0.01%new13F-HRTimelineGroup
Round Rock Advisors LLC8,580$212K0.03%new13F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC7,860$209K<0.01%new13F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…7,665$204K<0.01%+6,83013F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…7,504$200K<0.01%013F-HRTimeline
KLP KAPITALFORVALTNING AS7,400$197K<0.01%013F-HRTimeline
FMR LLCin group FMR LLC6,472$172K<0.01%-73113F-HRTimelineGroup
Pacer Advisors, Inc.5,996$160K<0.01%-320,10213F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…5,531$147K<0.01%-95213F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…5,265$140K<0.01%013F-HRTimeline
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC4,743$126K<0.01%new13F-HRTimelineGroup
State of Wyoming3,301$88K0.01%+57813F-HRTimeline
HANTZ FINANCIAL SERVICES, INC.3,122$83K<0.01%+1,74513F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…3,101$82.6K<0.01%-66113F-HRTimelineGroup
QUADRANT CAPITAL GROUP LLC3,076$82K<0.01%new13F-HRTimeline
GROUP ONE TRADING LLC2,071$55.2K<0.01%new13F-HRTimeline
OAKWORTH CAPITAL, INC.1,874$49.9K<0.01%-4,12613F-HRTimeline
Blue Trust, Inc.1,768$47.1K<0.01%-813F-HRTimeline
IFP Advisors, Inc1,570$41.8K<0.01%-46513F-HR/ATimeline
CWM, LLCin group CWM, LLC1,508$40K<0.01%-2,99413F-HRTimelineGroup
SHELL ASSET MANAGEMENT CO1,492$40K<0.01%-2,68113F-HRTimeline
Allworth Financial LP1,475$39.3K<0.01%-7013F-HRTimeline
GAMMA Investing LLC1,223$32.6K<0.01%-93913F-HRTimeline
Quarry LP1,183$31.5K0.01%new13F-HRTimeline
Global Retirement Partners, LLC1,024$27.3K<0.01%+70313F-HRTimeline
GF FUND MANAGEMENT CO. LTD.1,000$26.6K<0.01%-23013F-HRTimeline
FNY Investment Advisers, LLC1,000$26K0.01%new13F-HRTimeline
Farther Finance Advisors, LLC944$25.2K<0.01%+73713F-HRTimeline
MassMutual Private Wealth & Trust, FSB927$24.7K<0.01%-33513F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\850$22.7K<0.01%+41913F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…822$21.9K<0.01%-2,76113F-HRTimelineGroup
CIBC Private Wealth Group LLCin group CIBC Bancorp USA Inc.721$19.2K<0.01%013F-HRTimelineGroup
1620 INVESTMENT ADVISORS, INC.682$18.2K0.01%013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC629$16.8K<0.01%+25513F-HRTimeline
RICHARDSON FINANCIAL SERVICES INC.611$16.3K0.01%new13F-HRTimeline
SIGNATUREFD, LLC522$13.9K<0.01%-75013F-HRTimeline
TD PRIVATE CLIENT WEALTH LLC474$12.6K<0.01%-1,22113F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…468$12.5K<0.01%+5413F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…451$12K<0.01%-2913F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…423$11.3K<0.01%new13F-HRTimelineGroup
Larson Financial Group LLC409$10.9K<0.01%+38113F-HRTimeline
Salomon & Ludwin, LLC377$10.1K<0.01%new13F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP367$9.85K<0.01%013F-HRTimelineGroup
Versant Capital Management, Inc291$7.75K<0.01%-33313F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK271$7.22K<0.01%+1813F-HRTimelineGroup
HARBOUR INVESTMENTS, INC.270$7.2K<0.01%013F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.276$7K<0.01%+1013F-HRTimeline
SIMPLEX TRADING, LLC274$7K<0.01%-1,10513F-HRTimeline
Essential Partners LLC250$6.66K<0.01%+9413F-HRTimeline
UMB Bank, n.a.247$6.58K<0.01%+22813F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Arax Advisory Partners238$6.34K<0.01%+15713F-HRTimeline
Spire Wealth Managementin group Spire Wealth Management217$5.78K<0.01%+513F-HRTimelineGroup