Dun Haiping 4

4 · ACM Research, Inc. · Filed Mar 11, 2026

AI-generated summary of this filing

Updated Mar 12, 2026

ACM Research (ACMR) Director Dun Haiping Exercises Options, Sells 5,000 Shares

What Happened

Dun Haiping, a director of ACM Research (ACMR), exercised 5,000 stock options at $5.60 per share (total cost $28,000) on March 9, 2026. The filing also reports the disposition of 5,000 shares the same day: 4,100 sold at a weighted avg $43.37 for $177,817 and 900 sold at a weighted avg $43.94 for $39,546, for total proceeds of $217,363. The Form 4 also shows a derivative disposition entry for 5,000 shares at $0 (related to the option exercise).

Key Details

Transaction date: 2026-03-09; Form 4 filed 2026-03-11 (appears timely).
Exercise: 5,000 shares @ $5.60 = $28,000 (option fully vested per filing).
Sales: 4,100 shares @ weighted avg $43.37 ($177,817) and 900 shares @ weighted avg $43.94 ($39,546); combined proceeds ~$217,363. Reported weighted-price ranges: $42.88–$43.87 and $43.90–$44.00.
Footnotes: Sales were executed under a Rule 10b5-1 trading plan adopted Aug 13, 2025. Option is fully vested.
Shares owned after transaction: Not specified in the provided filing.

Context

The filing shows an exercise of options followed by same-day sales — commonly an exercise-and-sell pattern. The presence of a 10b5-1 plan indicates the sales were prearranged and routine rather than ad-hoc trades. The cash received from sales (~$217k) substantially exceeded the exercise cost ($28k); the filing does not state whether this was a cashless exercise or to cover taxes/fees.

Form 4

Period: 2026-03-09

Director

Transactions

Exercise/Conversion
Class A Common Stock
2026-03-09$5.60/sh+5,000$28,000→ 5,000 total
Sale
Class A Common Stock
[F1][F2]
2026-03-09$43.37/sh−4,100$177,817→ 900 total
Sale
Class A Common Stock
[F1][F3]
2026-03-09$43.94/sh−900$39,546→ 0 total
Exercise/Conversion
Stock Option
[F4]
2026-03-09−5,000→ 55,000 total
Exercise: $5.60Exp: 2029-04-22→ Class A Common Stock (5,000 underlying)

Holdings

Footnotes (4)

[F1]The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2025.
[F2]The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.88 to $43.87, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) and (3) to this Form 4.
[F3]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $43.90 to $44.00, inclusive.
[F4]The option is fully vested and exercisable.

Signature

/s/ Mark McKechnie, Attorney-in-Fact for Haiping Dun|2026-03-11

1 file