Amphastar (AMPH) Director Richard K. Prins Sells 7,973 Shares

What Happened
Richard K. Prins, a director of Amphastar Pharmaceuticals, sold 7,973 shares of AMPH stock in an open-market/private sale reported on Form 4. The sale price was $20.30 per share, for total gross proceeds of approximately $161,852. This was a sale (S), which is generally a disposition of shares rather than a purchase signal.

Key Details

• Transaction date: 2026-08-11 (reported on Form 4 filed 2026-08-12; Accession 0001047579-26-000005)
• Transaction type/code: Sale (S) — listed as open market or private sale
• Shares sold: 7,973 at $20.30 per share
• Gross proceeds: ~$161,852
• Shares owned after transaction: Not disclosed in the provided filing excerpt
• Footnotes/plan details: None disclosed in the provided data (no 10b5-1 or tax-withholding notes shown)
• Timeliness: Report filed the next day (no late-filing indication in the provided information)

Context
Sales by corporate insiders can be routine (portfolio diversification, tax obligations, or liquidity needs) and do not by themselves indicate the insider’s view on the company’s prospects. This report reflects a straightforward sale by a company director; there is no information in the provided filing about option exercises, gifts, or special trading plans.