Wang David H 4

4 · ACM Research, Inc. · Filed Mar 13, 2026

AI-generated summary of this filing

Updated Mar 13, 2026

ACM Research (ACMR) CEO David H. Wang Exercises Options, Sells Shares

What Happened

David H. Wang, Chief Executive Officer, President, Director and a 10% owner of ACM Research (ACMR), exercised 110,000 options (60,000 on Mar 11, 2026 and 50,000 on Mar 12, 2026) at $1.00 per share (total exercise cost $110,000) and sold 110,000 common shares in open-market transactions for aggregate gross proceeds of $5,154,404. The sales were executed in multiple trades on Mar 11–12, 2026 at weighted-average prices reported between $44.92 and $48.34.

Key Details

Transaction dates: March 11–12, 2026; Form 4 filed Mar 13, 2026 (appears timely).
Options exercised: 60,000 (3/11) and 50,000 (3/12) at $1.00 each (total $110,000 paid).
Market sales: 60,000 shares sold on 3/11 (55,373 @ $47.89 and 4,627 @ $48.34); 50,000 shares sold on 3/12 (10,561 @ $44.92; 38,737 @ $45.74; 702 @ $46.57). Total proceeds ≈ $5,154,404.
Footnotes: Sales were made pursuant to a Rule 10b5-1 trading plan adopted Nov 29, 2024 (F1). Reported prices are weighted averages across multiple trades (F2–F6). The option was fully vested and exercisable (F7).
Shares owned after transaction: Not specified in the provided extract; filing identifies Wang as a 10% owner.
Filing timeliness: Period of report Mar 11, 2026; Form 4 filed Mar 13, 2026 — no late-filing indication in provided data.

Context

This was an exercise of vested options followed by open-market sales of the resulting shares (i.e., a cashing-out of exercised options rather than a simple buy-and-hold purchase). The sales were executed under a pre-arranged 10b5-1 plan, which typically schedules trades in advance and may limit inference about immediate insider sentiment.

Form 4

Period: 2026-03-11

DirectorSee Remarks10% Owner

Transactions

Exercise/Conversion
Class A Common Stock
2026-03-11$1.00/sh+60,000$60,000→ 862,708 total
Sale
Class A Common Stock
[F1][F2]
2026-03-11$47.89/sh−55,373$2,651,813→ 807,335 total
Sale
Class A Common Stock
[F1][F3]
2026-03-11$48.34/sh−4,627$223,669→ 802,708 total
Exercise/Conversion
Class A Common Stock
2026-03-12$1.00/sh+50,000$50,000→ 852,708 total
Sale
Class A Common Stock
[F1][F4]
2026-03-12$44.92/sh−10,561$474,400→ 842,147 total
Sale
Class A Common Stock
[F1][F5]
2026-03-12$45.74/sh−38,737$1,771,830→ 803,410 total
Sale
Class A Common Stock
[F1][F6]
2026-03-12$46.57/sh−702$32,692→ 802,708 total
Exercise/Conversion
Stock Option
[F7]
2026-03-11−60,000→ 420,002 total
Exercise: $1.00Exp: 2026-12-27→ Class A Common Stock (60,000 underlying)
Exercise/Conversion
Stock Option
[F7]
2026-03-12−50,000→ 370,002 total
Exercise: $1.00Exp: 2026-12-27→ Class A Common Stock (50,000 underlying)

Holdings

Class A Common Stock
(indirect: By Spouse)
100,002
Class A Common Stock
(indirect: By Sophia Wang, daughter of David H. Wang)
45,837
Class A Common Stock
(indirect: By Trust)
180,000
Class A Common Stock
(indirect: By Trust)
620,001

Footnotes (7)

[F1]The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024.
[F2]The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.23 to $48.22, 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), (5), and (6) 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 $48.23 to $48.61, inclusive.
[F4]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $44.40 to $45.39, inclusive.
[F5]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $45.40 to $46.39, inclusive.
[F6]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $46.45 to $46.59, inclusive.
[F7]The option is fully vested and exercisable.

Signature

/s/ Mark McKechnie, Attorney-in-Fact for David H. Wang|2026-03-13

1 file