Dun Haiping 4
4 · ACM Research, Inc. · Filed May 21, 2026
Research Summary
AI-generated summary of this filing
ACM Research Director Dun Haiping Exercises Options, Sells Shares
What Happened Dun Haiping, a director of ACM Research, exercised options on May 19, 2026 and executed open‑market sales the same day. The filing shows an exercise/conversion of 10,000 option shares: 5,000 shares were acquired at $5.60 per share (cost = $28,000) and 5,000 shares are reported as disposed at $0.00 in the derivative line (see Context below). Separately, Dun sold a total of 5,000 shares in multiple open‑market transactions on May 19, 2026 for aggregate proceeds of approximately $331,111 (sales at weighted average prices shown below).
Key Details
- Transaction date: May 19, 2026; Form 4 filed May 21, 2026 (timely — within the 2‑business‑day reporting window).
- Options exercised: 10,000 shares total; 5,000 acquired at $5.60 each (total $28,000). Footnote F6: the option is fully vested and exercisable.
- Shares sold (total 5,000) and reported proceeds (weighted average prices):
- 1,333 shares @ weighted $63.84 (range $63.70–$64.22) — $85,099 (F2)
- 500 shares @ weighted $65.09 (range $64.78–$65.77) — $32,545 (F3)
- 1,309 shares @ weighted $67.21 (range $66.41–$67.37) — $87,978 (F4)
- 1,858 shares @ weighted $67.54 (range $67.43–$68.00) — $125,489 (F5)
- Aggregate sale proceeds ≈ $331,111.
- Footnote F1: all sales were effected pursuant to a prearranged Rule 10b5‑1 trading plan adopted Aug 13, 2025.
- Shares owned after the transactions are not stated in the excerpt of the filing.
Context
- The filing shows a 5,000‑share disposal at $0.00 in the derivative line — such entries commonly reflect shares tendered or withheld in connection with the option exercise (e.g., to cover exercise cost or tax withholding) rather than a market sale.
- The combination of exercising options and selling shares that same day is consistent with a cash‑raising or exercise‑related liquidity event; the 10b5‑1 plan indicates the sales were preplanned and not ad hoc market timing.
- This is a director (non‑employee insider) transaction; the filing provides factual detail but does not indicate the director’s motivations.
Insider Transaction Report
Form 4
Dun Haiping
Director
Transactions
- Exercise/Conversion
Class A Common Stock
2026-05-19$5.60/sh+5,000$28,000→ 5,000 total - Sale
Class A Common Stock
[F1][F2]2026-05-19$63.84/sh−1,333$85,099→ 3,667 total - Sale
Class A Common Stock
[F1][F3]2026-05-19$65.09/sh−500$32,545→ 3,167 total - Sale
Class A Common Stock
[F1][F4]2026-05-19$67.21/sh−1,309$87,978→ 1,858 total - Sale
Class A Common Stock
[F1][F5]2026-05-19$67.54/sh−1,858$125,489→ 0 total - Exercise/Conversion
Stock Option
[F6]2026-05-19−5,000→ 50,000 totalExercise: $5.60Exp: 2029-04-22→ Class A Common Stock (5,000 underlying)
Holdings
- 100,000(indirect: By Trust)
Class A Common Stock
- 755,090(indirect: By Trust)
Class A Common Stock
Footnotes (6)
- [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 $63.7 to $64.22, 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), (3), (4), and (5) 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 $64.78 to $65.77, inclusive.
- [F4]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $66.41 to $67.37, inclusive.
- [F5]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $67.43 to $68.00, inclusive.
- [F6]The option is fully vested and exercisable.
Signature
/s/ Mark McKechnie, Attorney-in-Fact for Haiping Dun|2026-05-21