ACM Research (ACMR) 10% Owner David Wang Sells Shares, Exercises Options

What Happened

• David H. Wang, a reported 10% owner of ACM Research (ACMR), exercised a total of 140,000 shares of derivative/option interest (70,000 on 2026-09-08 and 70,000 on 2026-09-09) at $1.00 per share (total exercise cost $140,000). On those same dates he sold a total of 140,000 common shares in open-market transactions for aggregate gross proceeds of $10,630,010.
• Sales were executed across multiple trades at weighted-average prices shown below (individual trade price ranges are noted in the filing footnotes). The option was fully vested and exercisable.

Key Details

• Transaction dates: 2026-09-08 and 2026-09-09; Form 4 filed 2026-09-10 (timely).
• Exercises: 70,000 shares @ $1.00 on 9/8 ($70,000); 70,000 shares @ $1.00 on 9/9 ($70,000).
• Sales (summary by day / totals): 70,000 shares sold on 9/8 for $5,408,519 (multiple trades; weighted averages reported); 70,000 shares sold on 9/9 for $5,221,491 (multiple trades); total sales = $10,630,010.
• Net (sales minus exercise cost): approximately $10.49M in gross proceeds before fees/taxes.
• Footnotes: Sales were effected pursuant to a Rule 10b5-1 trading plan adopted June 5, 2026 (F1). The option is fully vested and exercisable (F11). Reported prices are weighted averages across multiple executions; the filing provides price ranges for those executions (F2–F10).
• Shares owned after transaction: Not specified in the information provided in your query / not reported here.

Context

• This pattern — exercising vested options at a low strike and selling the resulting shares the same day — is commonly reported as a cashless exercise followed by sale. The filing shows the exercises and sales occurred on the same dates, and the seller used a pre-established 10b5-1 plan for the disposals.
• As a 10% owner (not listed as an executive here), these transactions reflect insider/large-holder activity and are reported under Form 4 rules, but they do not, by themselves, reveal the insider’s motives.