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Insider trade

Amphstar Pharmaceuticals, Inc. (AMPH)Director sold ~$45K

Floyd F. Petersen, Director at Amphstar Pharmaceuticals, Inc., sold ~$45K of Amphstar Pharmaceuticals, Inc. shares.

~$45K
Approx. value · 1,737 sh @ $25.69
74K
Holds after · shares reported
Traded
Dec 11, 2025
Filed
Dec 15, 2025

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. Oct 21, 2025Company filing · Form 8-K · Material agreementSigned an important agreement
  2. Nov 3, 2025InsiderDirector sold ~$13K of AMPH shares in the open market
  3. Nov 6, 2025Company filing · Form 8-K · ResultsReported its results
  4. Nov 13, 2025InsiderDirector sold ~$442K of AMPH shares in the open market
  5. Nov 25, 2025InsiderDirector sold ~$113K of AMPH shares in the open market
  6. Dec 11, 2025 · this disclosureInsiderDirector sold ~$45K of AMPH shares in the open market

What came next

  1. Dec 12, 2025InsiderDirector sold ~$63K of AMPH shares in the open market
  2. Dec 17, 2025InsiderOfficer sold ~$256K of AMPH shares in the open market
  3. Jan 6, 2026Company filing · Form 8-K · Material agreement, Reg FDSigned an important agreement, and shared information with investors
  4. Feb 26, 2026Company filing · Form 8-K · ResultsReported its results
  5. 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…”
  6. Mar 3, 2026Company filing · Form 8-K · Material agreementSigned an important agreement
View the official recordSEC Form 4

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

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.

Other recent filings by Floyd F. Petersen, Director

The full history of Floyd F. Petersen, Director is on the profile page.

How this filing works

Other disclosures at Amphstar Pharmaceuticals, Inc.

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

This is one filing. OQRO holds the rest

Insider trades filed with the SEC, stock trades disclosed by members of Congress, fund holdings from 13F filings and federal contract awards, each one in plain words next to its official filing. On this page it opens why the trade stands out, what the company did around that time, the price since, and every field of the form.

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