Rong Zhou

All filings by Rong Zhou on record concern Amphastar Pharmaceuticals, Inc. Between 13 May 2021 and 16 September 2026, the trades on record add up to 43 filings.

The open-market record consists of 6 sales worth €1.0M, with no purchase. Other entries cover 16 share grants and 21 option exercises. So far in 2026, the count stands at no purchases and 2 sales.

Most recently, on 17 September 2026, the filings show an option exercise worth €116k in Amphastar Pharmaceuticals, Inc. The median gap between a trade and its publication by SEC (Form 4) is 2 days. The legal deadline for a Form 4 is two business days after the transaction. A sale on its own says little: insiders also sell to pay tax, fund a purchase or diversify. This summary is built from SEC (Form 4) disclosures alone and does not predict where the share price will go.