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Disclosery

AMPH AMPHASTAR PHARMACEUTICALS IN

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COM (common), issuer CIK 1297184

229 managers (236 13F filers) reported a position in AMPH shares at 2025-12-31, 33,583,033 shares in all. 22 filers opened a position and 32 filers sold out during the quarter.

Managers
229
13F filers
236
New
22
Added
94
Reduced
87
Sold out
32
Shares held by filers
33,583,033

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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.5,462,015$146M<0.01%-23,04213F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding2,618,620$70.1M-23,424Timeline
TD Asset Management Inc1,963,052$52.6M0.04%+31,16013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP1,799,685$48.2M0.01%+44,02013F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,531,786$41M<0.01%+31,04413F-HRTimelineGroup
FULLER & THALER ASSET MANAGEMENT, INC.1,394,463$37.3M0.13%+40,53613F-HR/ATimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP1,237,284$33.1M0.03%+363,21613F-HRTimelineGroup
Epoch Investment Partners, Inc.1,126,585$30.2M0.17%-7,40113F-HRTimeline
Boston Trust Walden Corpin group Boston Trust Walden Corp1,087,266$29.1M0.22%-85,84113F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC886,825$23.8M<0.01%-35,75213F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC665,336$17.8M0.01%+376,75113F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY591,631$15.8M<0.01%+16,95213F-HR/ATimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …559,426$15M0.01%+167,11613F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.557,066$14.9M0.01%+39,84413F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC556,709$14.9M<0.01%+315,48113F-HR/ATimelineGroup
RENAISSANCE TECHNOLOGIES LLC544,700$14.6M0.02%-42,20013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.501,404$13.4M<0.01%+111,81113F-HRTimelineGroup
SYSTEMATIC FINANCIAL MANAGEMENT LP435,580$11.7M0.27%+12,46813F-HRTimeline
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC402,563$10.8M0.03%+76,38013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP371,391$9.95M<0.01%-28,07913F-HRTimelineGroup
ROYCE & ASSOCIATES LP352,297$9.43M0.1%-14,02513F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co350,707$9.39M<0.01%-5,70213F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC323,549$8.66M0.18%+11,21213F-HRTimeline
Clark Capital Management Group, Inc.317,482$8.5M0.05%+33,80813F-HRTimeline
UBS Group AGgroup of 2 filers holding311,856$8.35M-54,753Timeline
VICTORY CAPITAL MANAGEMENT INC305,161$8.17M<0.01%+93,36113F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC290,673$7.78M0.01%-407,09213F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp259,061$6.94M<0.01%-8,76713F-HRTimelineGroup
Bridge City Capital, LLC235,485$6.31M1.85%+99,22713F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC231,305$6.19M0.02%-61,13813F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC228,724$6.13M<0.01%+1,94913F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding217,974$5.84M+10,692Timeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC217,537$5.83M0.01%+69,07813F-HRTimelineGroup
DENALI ADVISORS LLC211,765$5.67M0.63%+76,76513F-HRTimeline
Pacer Advisors, Inc.177,744$4.76M0.01%+171,74813F-HR/ATimeline
Empowered Funds, LLC165,907$4.44M0.08%+16,11213F-HR/ATimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO158,644$4.25M<0.01%-94,58813F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP140,310$3.76M<0.01%-10,11213F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC133,715$3.58M<0.01%+3,87413F-HRTimelineGroup
Franklin Resourcesgroup of 2 filers holding131,462$3.52M+121,937Timeline
LAM GROUP, INC.130,800$3.5M2%013F-HRTimeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …129,144$3.46M<0.01%-24,20713F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/128,174$3.43M<0.01%+1,07713F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND125,968$3.37M<0.01%+35,79913F-HRTimeline
ALGERT GLOBAL LLC125,130$3.35M0.05%-267,77213F-HR/ATimeline
Public Sector Pension Investment Board122,505$3.28M0.01%-17,17013F-HRTimeline
RICE HALL JAMES & ASSOCIATES, LLC121,176$3.25M0.18%-8,16313F-HRTimeline
BESSEMER GROUP INCin group BESSEMER GROUP INC120,890$3.24M<0.01%+120,74713F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS120,893$3.24M<0.01%-101,12613F-HRTimelineGroup
Trexquant Investment LP113,673$3.04M0.03%new13F-HRTimeline
Qube Research & Technologies Ltd111,439$2.98M<0.01%-129,77313F-HRTimeline
LSV ASSET MANAGEMENT110,300$2.95M0.01%+37,00013F-HRTimeline
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding98,678$2.64M-22,800Timeline
SG Americas Securities, LLC93,515$2.5M<0.01%new13F-HRTimeline
Quantedge Capital Pte Ltd91,700$2.46M1.17%+46,60013F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc90,730$2.43M<0.01%-6,88413F-HRTimelineGroup
O'SHAUGHNESSY ASSET MANAGEMENT, LLC87,183$2.33M0.01%+18,12513F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC84,454$2.26M<0.01%-33,73313F-HRTimelineGroup
RHUMBLINE ADVISERS82,390$2.21M<0.01%-7,73913F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management77,467$2.07M<0.01%-64,38513F-HRTimelineGroup
Nuveen, LLCin group TIAA76,101$2.04M<0.01%-1,60213F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC75,319$2.02M<0.01%+8,82513F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 3 filers holding75,102$2.01M+22,970Timeline
Swiss National Bank72,600$1.94M<0.01%013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC67,652$1.81M<0.01%+5,50713F-HRTimelineGroup
CX Institutional64,123$1.72M0.05%+80713F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC63,232$1.69M0.02%+12,07213F-HRTimeline
CIBC WORLD MARKET INC.62,192$1.67M<0.01%new13F-HRTimeline
ALLIANCEBERNSTEIN L.P.60,630$1.62M<0.01%+10,00013F-HRTimeline
SteelPeak Wealth, LLC55,695$1.49M0.05%013F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC54,359$1.46M<0.01%-2,12813F-HRTimelineGroup
Creative Planningin group Creative Planning51,664$1.38M<0.01%-3,45113F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd48,607$1.3M0.03%new13F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC47,203$1.26M<0.01%-22613F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN45,302$1.21M<0.01%+16,55113F-HRTimelineGroup
SummerHaven Investment Management, LLC38,200$1.02M0.58%013F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/36,796$986K<0.01%-238,42613F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…35,798$959K<0.01%-8113F-HRTimeline
Polaris Capital Management, LLC35,532$952K0.08%+22,43213F-HRTimeline
DekaBank Deutsche Girozentrale20,848$951K<0.01%013F-HRTimeline
Campbell & CO Investment Adviser LLC30,682$822K0.04%-13,38613F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co30,216$809K<0.01%013F-HRTimelineGroup
CANADA PENSION PLAN INVESTMENT BOARD29,800$798K<0.01%+9,10013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\29,557$792K<0.01%+1,16113F-HRTimelineGroup
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …29,104$785K<0.01%new13F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC28,823$772K<0.01%+6,84813F-HRTimelineGroup
Illumine Investment Management, LLC28,328$759K0.55%+65113F-HRTimeline
CITIGROUP INCin group CITIGROUP INC28,280$757K<0.01%+8,46513F-HRTimelineGroup
State of Alaska, Department of Revenue27,916$747K0.01%+7,12813F-HRTimeline
Gotham Asset Management, LLC27,802$745K<0.01%+12,43813F-HRTimeline
Freestone Grove Partners LP27,593$739K0.01%new13F-HRTimeline
Legato Capital Management LLC26,590$712K0.06%-9,47013F-HRTimeline
Arkadios Wealth Advisors26,303$704K0.01%-9,70513F-HRTimeline
Advisor OS, LLCin group Advisor OS, LLC25,405$680K0.05%013F-HRTimelineGroup
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…24,313$651K<0.01%-1,51513F-HRTimelineGroup
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.23,537$630K<0.01%new13F-HRTimelineGroup
NEW YORK STATE TEACHERS RETIREMENT SYST…22,977$615K<0.01%-35113F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…21,075$564K<0.01%-2,01813F-HRTimelineGroup
Illinois Municipal Retirement Fund20,913$560K0.01%+16613F-HRTimeline
Round Rock Advisors LLC20,477$548K0.08%+11,89713F-HR/ATimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…20,465$548K0.01%+6,97613F-HRTimelineGroup
Vident Advisory, LLCin group Vident Advisory, LLC20,409$547K0.01%+1,97813F-HRTimelineGroup
LPL Financial LLC19,844$531K<0.01%+5,19913F-HRTimeline
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding19,112$512K+72Timeline
LOS ANGELES CAPITAL MANAGEMENT LLC19,397$478K<0.01%+45913F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD17,506$469K<0.01%-3,82813F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson16,868$452K<0.01%013F-HRTimelineGroup
Sterling Capital Management LLC16,602$445K0.01%+4,93513F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC16,431$440K<0.01%+18113F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …16,402$439K<0.01%-1,36013F-HRTimelineGroup
Vestcor Inc16,383$439K0.01%+7,00013F-HRTimeline
Louisiana State Employees Retirement Sy…16,200$434K0.01%-30013F-HRTimeline
Quantinno Capital Management LP15,568$417K<0.01%+2,30813F-HRTimeline
Corient Private Wealth LPgroup of 2 filers holding15,339$411K-384Timeline
Assenagon Asset Management S.A.15,216$407K<0.01%013F-HRTimeline
ADVISORY RESEARCH INC15,161$406K0.05%-30713F-HRTimeline
ExodusPoint Capital Management, LP14,929$400K<0.01%new13F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC14,860$398K<0.01%-34,45013F-HRTimelineGroup
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…14,852$398K0.01%new13F-HRTimelineGroup
MML INVESTORS SERVICES, LLC14,661$393K<0.01%+6,19913F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO14,649$392K<0.01%+2,67713F-HRTimelineGroup
Quantbot Technologies LP14,515$389K0.01%-15,24813F-HRTimeline
Janney Montgomery Scott LLC14,230$381K<0.01%+82513F-HRTimeline
Man Group plcin group Man Group plc14,151$379K<0.01%-18,23413F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.12,854$344K<0.01%-18,76013F-HRTimelineGroup
MARTINGALE ASSET MANAGEMENT L P12,400$332K0.01%-6,12113F-HRTimeline
VIRGINIA RETIREMENT SYSTEMS ET Al12,362$331K<0.01%-1,20013F-HRTimeline
Ameritas Investment Partners, Inc.group of 2 filers holding12,287$329K+9,186Timeline
CIM, LLC11,342$304K0.04%-28613F-HRTimeline
SEGALL BRYANT & HAMILL, LLC11,185$300K<0.01%013F-HRTimeline
PROFUND ADVISORS LLC11,121$298K0.01%+2,93313F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…10,913$292K<0.01%013F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM10,428$279K<0.01%-71713F-HRTimeline
AMALGAMATED BANK10,419$279K<0.01%-7513F-HRTimeline
Police & Firemen's Retirement System of…10,263$275K<0.01%013F-HRTimeline
Significant Wealth Partners LLC9,624$258K0.29%-10,95513F-HRTimeline
EXCHANGE TRADED CONCEPTS, LLC9,418$252K<0.01%-56713F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC9,332$249K<0.01%-35,01713F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA9,265$248K<0.01%-40,40613F-HRTimelineGroup
ProShare Advisors LLC9,083$243K<0.01%+45713F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…9,053$242K<0.01%-1,47013F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…8,760$235K<0.01%-35813F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC8,742$234K<0.01%+88213F-HRTimeline
State of Tennessee, Department of Treas…8,619$228K<0.01%-68113F-HRTimeline
COMERICA BANK8,488$227K<0.01%-97713F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC8,721$226K<0.01%-55213F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND8,142$218K<0.01%+10013F-HRTimeline
KLP KAPITALFORVALTNING AS7,900$212K<0.01%+50013F-HRTimeline
Jump Financial, LLCin group Jump Financial, LLC7,800$209K<0.01%new13F-HRTimelineGroup
AlphaQuest LLC7,720$207K0.01%-85513F-HRTimeline
Rafferty Asset Management, LLC7,682$206K<0.01%new13F-HRTimeline
State of Wyoming7,561$202K0.02%+4,26013F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…7,504$201K<0.01%013F-HRTimeline
China Universal Asset Management Co., L…7,488$201K0.02%-66213F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…5,808$156K<0.01%+27713F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…5,265$141K<0.01%013F-HRTimeline
HANTZ FINANCIAL SERVICES, INC.4,484$120K<0.01%+1,36213F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Basecamp Wealth Advisors LLC4,388$118K0.03%13F-HRTimeline
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …3,762$101K<0.01%+3,58213F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…3,729$99.9K<0.01%-3,93613F-HRTimelineGroup
FMR LLCin group FMR LLC3,523$94.3K<0.01%-2,94913F-HRTimelineGroup
QUADRANT CAPITAL GROUP LLC2,734$73.2K<0.01%-34213F-HRTimeline
TD PRIVATE CLIENT WEALTH LLC2,418$64.8K<0.01%+1,94413F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,787$47.9K<0.01%+96513F-HRTimelineGroup
GROUP ONE TRADING LLC1,741$46.6K<0.01%-33013F-HRTimeline
GAMMA Investing LLC1,685$45.1K<0.01%+46213F-HRTimeline
CWM, LLCin group CWM, LLC1,683$45K<0.01%+17513F-HRTimelineGroup
Pinnacle Wealth Planning Services, Inc.1,615$43.2K<0.01%new13F-HRTimeline
Allworth Financial LP1,486$39.8K<0.01%+1113F-HRTimeline
Farther Finance Advisors, LLC1,381$37K<0.01%+43713F-HRTimeline
Blue Trust, Inc.1,240$33.2K<0.01%-52813F-HRTimeline
Global Retirement Partners, LLC1,174$31.4K<0.01%+15013F-HRTimeline
IFP Advisors, Inc970$26K<0.01%-60013F-HRTimeline
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC912$24.4K<0.01%new13F-HRTimelineGroup
GF FUND MANAGEMENT CO. LTD.902$24.2K<0.01%-9813F-HRTimeline
CIBC Private Wealth Group LLCin group CIBC Bancorp USA Inc.878$23.5K<0.01%+15713F-HRTimelineGroup
RICHARDSON FINANCIAL SERVICES INC.819$21.9K0.01%+20813F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\806$21.6K<0.01%-4413F-HRTimelineGroup
Larson Financial Group LLC768$20.6K<0.01%+35913F-HRTimeline
MassMutual Private Wealth & Trust, FSB767$20.5K<0.01%-16013F-HRTimeline
Torren Management, LLC762$20.4K0.01%13F-HRTimeline
1620 INVESTMENT ADVISORS, INC.718$19.2K0.01%+3613F-HRTimeline
NISA INVESTMENT ADVISORS, LLC620$16.6K<0.01%-913F-HRTimeline
SIGNATUREFD, LLC542$14.5K<0.01%+2013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP531$14.2K<0.01%+16413F-HRTimelineGroup
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…509$13.6K<0.01%+5813F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…508$13.6K<0.01%+4013F-HRTimeline
Versant Capital Management, Inc362$9.69K<0.01%+7113F-HRTimeline
MAI Capital Management358$9.59K<0.01%+30013F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.271$7K<0.01%-513F-HRTimeline
Smartleaf Asset Management LLC259$6.99K<0.01%+5213F-HRTimeline
UMB Bank, n.a.250$6.7K<0.01%+313F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Salomon & Ludwin, LLC229$6.12K<0.01%-14813F-HRTimeline
Spire Wealth Managementin group Spire Wealth Management213$5.7K<0.01%-413F-HRTimelineGroup
Aster Capital Management (DIFC) Ltd200$5.36K<0.01%new13F-HRTimeline
Essential Partners LLC200$5.36K<0.01%-5013F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK191$5.12K<0.01%-8013F-HRTimelineGroup
Parkside Financial Bank & Trust173$4.63K<0.01%013F-HRTimeline
Truvestments Capital LLC154$4.12K<0.01%013F-HRTimeline
City State Bank150$4.02K<0.01%013F-HRTimeline