Amphstar Pharmaceuticals, Inc. (AMPH)Systematic Financial Management LP added to its stake +12K shares

436K

Shares reported · +12K vs prior quarter

0.27%

Disclosed portfolio weight

$11.7M

Reported value

Holdings as of

Dec 31, 2025

Filed

Feb 9, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Dec 11, 2025InsiderDirector sold ~$45K of AMPH shares in the open market
2. Dec 12, 2025InsiderDirector sold ~$63K of AMPH shares in the open market
3. Dec 17, 2025InsiderOfficer sold ~$256K of AMPH shares in the open market
4. Jan 6, 2026Company filing · Form 8-K · Material agreement, Reg FDSigned an important agreement, and shared information with investors

What came next

1. Feb 26, 2026Company filing · Form 8-K · ResultsReported its results
2. Mar 3, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“On March 3, 2026 (the “Effective Date”), Amphastar Pharmaceuticals, Inc. (“Amphastar” or, the “Company”), entered into executive employment agreements with each of Jacob Liawatidewi, the Company’s Executive Vice President of Corporate Administration Center, Secretary and a member of the board of directors (the “Liawatidewi Employment Agreement”) and Rong Zhou, the Company’s Senior Executive Vice President of…”
3. Mar 3, 2026Company filing · Form 8-K · Material agreementSigned an important agreement
4. May 7, 2026Company filing · Form 8-K · ResultsReported its results

How to read SEC Form 13F-HR

Form 13F is the quarterly report in which investment managers that oversee $100 million or more list the US-listed stocks and some other securities they held on the last day of the quarter.

Full guide: What is an SEC Form 13F?

What else is on file for Amphstar Pharmaceuticals, Inc.

For Amphstar Pharmaceuticals, Inc., OQRO holds 5 insider filings (SEC Form 4 or Form 144) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its AMPH page.

How this filing works

• SEC Form 13F

Other disclosures at Amphstar Pharmaceuticals, Inc.

• SEC Form 4Sep 23, 2026
• SEC Form 4Sep 17, 2026
• SEC Form 4Sep 3, 2026
• SEC Form 4Aug 12, 2026
• SEC Form 4Aug 11, 2026
• SEC Form 13F-HRMay 13, 2026

Everything OQRO holds on this company is on its AMPH page.