Zhou Rong 4

What Happened

• Zhou Rong, Senior EVP, Production Center at Amphastar Pharmaceuticals (AMPH), had 1,357 shares withheld to satisfy tax obligations tied to the vesting of restricted stock units (RSUs). The withholding is reported as a disposition at $19.34 per share, totaling $26,244. This was a tax-withholding transfer (code F), not an open-market sale.

Key Details

• Transaction date: 2026-03-06
• Form 4 filed: 2026-03-10 (filed within the typical two-business-day reporting window)
• Shares withheld/disposed: 1,357 @ $19.34 each; total reported value $26,244
• Transaction code: F — payment of tax liability in connection with RSU vesting (footnote F1)
• Footnotes: F2 indicates some shares are held of record by the Zhou Family Trust (Zhou serves as trustee); F3 indicates some shares are held by the reporting person's spouse
• Shares owned after transaction: not specified in the provided filing excerpt

Context

• Code F tax-withholdings are a routine administrative step when RSUs vest: shares are retained to cover withholding taxes rather than sold on the open market. Such transactions generally do not indicate a change in the insider’s market view.