ACM Research director exercises options, sells shares
ACM Research, Inc. director Haiping Dun reported a mix of option exercises and share sales in Class A Common Stock.
Rhea-AI Filing Summary
ACM Research, Inc. director Haiping Dun reported a mix of option exercises and share sales in Class A Common Stock. On May 19, 2026, he exercised stock options for 5,000 shares at an exercise price of $5.60 per share, then sold 5,000 shares in multiple open-market transactions at prices between $63.84 and $67.54. The filing notes these sales were made under a pre-arranged Rule 10b5-1 trading plan adopted on August 13, 2025. After these transactions, he reported no directly held Class A Common Stock, while indirect holdings include 755,090 shares held by the Haiping Dun & Chi-Pin H Dun Revocable Trust and 100,000 shares held by the Dun Family GST Trust.
Positive
- None.
Negative
- None.
Insider Trade Summary 10b5-1
Exercise and Sale: 5,000 shares ($303K approx. pre-tax spread)
Exercise and Sale
8 txns
Insider
Dun Haiping
Role
Director
Sold
5,000 shs ($331K)
Approx. gross sale proceeds
$331K
Approx. exercise cost
$28K
Approx. pre-tax spread
$303K
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option | 5,000 | $0.00 | $0.00 |
| Exercise | Class A Common Stock | 5,000 | $5.60 | $28K |
| Sale | Class A Common Stock | 1,333 | $63.84 | $85K |
| Sale | Class A Common Stock | 500 | $65.09 | $33K |
| Sale | Class A Common Stock | 1,309 | $67.21 | $88K |
| Sale | Class A Common Stock | 1,858 | $67.54 | $125K |
| holding | Class A Common Stock | -- | -- | -- |
| holding | Class A Common Stock | -- | -- | -- |
Holdings After Transaction:
Stock Option — 50,000 contracts (Direct);
Class A Common Stock — 0 shares (Direct);
Class A Common Stock — 100,000 shares (Indirect, Dun Family GST Trust);
Class A Common Stock — 755,090 shares (Indirect, Haiping Dun & Chi-Pin H Dun Revocable Trust)
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.
Key Figures
Shares sold: 5,000 shares
Sale prices: $63.84–$67.54 per share
Options exercised: 5,000 shares
+5 more
8 metrics
Shares sold
5,000 shares
Class A Common Stock sold in open market on May 19, 2026
Sale prices
$63.84–$67.54 per share
Range of weighted average sale prices on May 19, 2026
Options exercised
5,000 shares
Stock option exercise into Class A Common Stock on May 19, 2026
Exercise price
$5.60 per share
Exercise price of stock option converted into 5,000 shares
Revocable trust holdings
755,090 shares
Indirect Class A holdings via Haiping Dun & Chi-Pin H Dun Revocable Trust
GST trust holdings
100,000 shares
Indirect Class A holdings via Dun Family GST Trust
Remaining options
50,000 options
Stock options outstanding after 5,000-share exercise, expiring April 22, 2029
Net share direction
net-sell 5,000 shares
Transaction summary net of option exercise and sales
Key Terms
Rule 10b5-1 trading plan, weighted average price, Stock Option, Class A Common Stock, +1 more
5 terms
Rule 10b5-1 trading plan regulatory
"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average price financial
"The price reported in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
Stock Option financial
"security_title: "Stock Option" with an expiration date of 2029-04-22"
A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.
Class A Common Stock financial
"security_title: "Class A Common Stock" for the reported sales and exercises"
Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.
fully vested and exercisable financial
"The option is fully vested and exercisable."
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What insider transactions did ACMR director Haiping Dun report on May 19, 2026?
ACMR director Haiping Dun exercised options for 5,000 Class A shares at $5.60 and sold 5,000 shares in open-market trades. The sales occurred at prices between $63.84 and $67.54, according to the Form 4 disclosure.
What price did Haiping Dun receive for his ACMR Class A Common Stock sales?
Dun’s ACMR Class A Common Stock sales occurred at weighted average prices reflecting trades between $63.84 and $67.54 per share. The filing notes multiple transactions within these ranges and offers to provide detailed price breakdowns upon request.
What are Haiping Dun’s ACMR holdings after these transactions?
Following the reported trades, Dun listed no directly held ACMR Class A Common Stock. Indirectly, 755,090 shares are held by the Haiping Dun & Chi-Pin H Dun Revocable Trust and 100,000 shares by the Dun Family GST Trust, as disclosed in the Form 4.
How does the Form 4 characterize the ACMR option involved in the exercise?
The Form 4 describes the ACMR stock option as fully vested and exercisable, with a conversion or exercise price of $5.60 per share and an expiration date of April 22, 2029. On May 19, 2026, 5,000 option shares were exercised into Class A Common Stock.
AI-generated analysis. How Rhea-AI works. Not financial advice.
