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Amphastar Pharmaceuticals, Inc.

AMPH
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001297184

In the last 90 days, Amphastar Pharmaceuticals, Inc. insiders filed 0 open-market purchases and 5 sales; 212 institutions reported holding it in 13F filings for Q2 2026, worth $572.1M in total; no superinvestor holds it.

Q4 2025 vs. Q3 2025

How the institutions holding Amphastar Pharmaceuticals, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025All holders in Q3 2025

13F holders of AMPH: Q3 2025 compared with Q4 2025
MeasureQ3 2025Of which not filed for Q4 2025Q4 2025Change
Holders2431236−6
Shares32.7M1.49K33.6M+837.1K (+2.6%)
Value$872.8M$40.0K$899.7M+$27.0M (+3.1%)

1 institution that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (26)

Institutions that held Amphastar Pharmaceuticals, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to AMPH in Q4 2025
InstitutionSharesValue% of portfolio
Trexquant Investment LP113,673$3.04M0.03%
Brandywine Global Investment Management, LLC105,417$2.82M0.02%
SG Americas Securities, LLC93,515$2.50M0.00%
CIBC World Markets Inc.62,192$1.67M0.00%
XTX Topco Ltd48,607$1.30M0.03%
Universal- Beteiligungs- und Servicegesellschaft mbH29,104$785.3K0.00%
Freestone Grove Partners LP27,593$738.9K0.01%
Federated Hermes, Inc.23,537$630.3K0.00%
ExodusPoint Capital Management, LP14,929$399.8K0.00%
Deerfield Management Company, L.P. (Series C)14,852$397.7K0.01%
Ameritas Advisory Services, LLC9,186$246.0K0.01%
Susquehanna International Group, LLP8,133$217.8K0.00%
Jump Financial, LLC7,800$208.9K0.00%
Rafferty Asset Management, LLC7,682$205.7K0.00%
Corient IA LLC7,500$200.8K0.19%
Basecamp Wealth Advisors LLC4,388$117.5K0.03%
Pinnacle Wealth Planning Services, Inc.1,615$43.3K0.00%
Lazard Asset Management LLC912$24.4K0.00%
Torren Management, LLC762$20.4K0.01%
Aster Capital Management (DIFC) Ltd200$5.36K0.00%
Elequin Capital LP27$7230.00%
Flagship Harbor Advisors, LLC25$6700.00%
Optima Capital LLC20$5360.00%
Trust Co15$4020.00%
Ankerstar Wealth, LLC15$4020.00%
Gilpin Wealth Management, LLC2$540.00%

Sold out (32)

Institutions that held Amphastar Pharmaceuticals, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of AMPH in Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Jefferies Financial Group Inc.89,233$2.38M
HRT Financial LP77,746$2.07M
Y-Intercept (Hong Kong) Ltd25,090$668.6K
Danske Bank A/S23,043$614.1K
Two Sigma Advisers, LP22,800$607.6K
Lighthouse Investment Partners, LLC21,600$575.6K
Cynosure Management, LLC17,820$474.9K
Wellington Management Group LLP17,199$458.4K
Jackson Creek Investment Advisors LLC14,743$393.0K
PDT Partners, LLC14,630$389.9K
Handelsbanken Fonder AB14,400$384.0K
Susquehanna Fundamental Investments, LLC12,568$334.9K
Hohimer Wealth Management, LLC11,972$319.1K
Teacher Retirement System of Texas9,356$249.3K
Bank of Montreal8,968$239.0K
Pathstone Holdings, LLC7,984$212.8K
Wolverine Asset Management LLC4,743$126.4K
Oakworth Capital, Inc.1,874$49.9K
Principal Securities, Inc.1,604$42.7K
Quarry LP1,183$31.5K
FNY Investment Advisers, LLC1,000$26.0K
Harbour Investments, Inc.270$7.20K
Simplex Trading, LLC274$7.00K
Wealthspire Advisors, LLC70$1.87K
Northwestern Mutual Wealth Management Co62$1.65K
Private Trust Co NA54$1.44K
Atlantic Trust, LLC33$880
Rialto Wealth Management, LLC23$613
Bell Investment Advisors, Inc16$427
Annis Gardner Whiting Capital Advisors, LLC16$427
Kilter Group LLC15$400
Caitong International Asset Management Co., Ltd3$80

Not filed for Q4 2025 yet (1)

Institutions that held Amphastar Pharmaceuticals, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding AMPH in Q3 2025 that haven't filed for Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Shell Asset Management Co1,492$40.0K