ACM Research (ACMR) officer exercises options, sells 18,750 shares under 10b5-1 plan
Filing Impact
Filing Sentiment
Form Type
4
Rhea-AI Filing Summary
ACM Research, Inc. insider activity: Officer Cheav Sotheara reported exercising stock options for 18,750 shares of Class A Common Stock at an exercise price of $13.89 per share and selling 18,750 shares in open-market transactions on June 4–5, 2026.
The sales were executed at reported prices generally in the low-to-mid $80s per share across multiple trades and were carried out under a pre-arranged Rule 10b5-1 trading plan adopted on March 5, 2026. Following these transactions, Sotheara directly holds 100,002 shares of ACM Research Class A Common Stock.
Positive
- None.
Negative
- None.
Insights
Routine option exercise and 10b5-1 sales with sizable stake retained.
Officer Cheav Sotheara exercised options to acquire 18,750 ACM Research Class A shares at an exercise price of $13.89 and sold 18,750 shares in open-market trades at prices reported in the low-to-mid $80s per share.
The filing shows 7 sale transactions and 2 derivative exercises, with post-transaction direct holdings of 100,002 shares. A footnote states the sales were made under a Rule 10b5-1 trading plan adopted on March 5, 2026, suggesting these were pre-planned rather than opportunistic trades.
Because the sale volume is modest relative to the remaining position and the activity is tied to option exercises and a pre-arranged plan, the transactions appear routine from a compensation and liquidity standpoint rather than a strong directional signal about ACM Research’s prospects.
Insider Trade Summary 10b5-1
Net Seller: 18,750 shares ($1,585,923)
Net Sell
11 txns
Insider
Cheav Sotheara
Role
See remarks
Sold
18,750 shs ($1.59M)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option | 5,399 | $0.00 | -- |
| Exercise | Class A Common Stock | 5,399 | $13.89 | $75K |
| Sale | Class A Common Stock | 2,384 | $81.73 | $195K |
| Sale | Class A Common Stock | 968 | $82.61 | $80K |
| Sale | Class A Common Stock | 400 | $84.01 | $34K |
| Sale | Class A Common Stock | 1,647 | $85.41 | $141K |
| Exercise | Stock Option | 13,351 | $0.00 | -- |
| Exercise | Class A Common Stock | 13,351 | $13.89 | $185K |
| Sale | Class A Common Stock | 1,300 | $84.08 | $109K |
| Sale | Class A Common Stock | 9,212 | $85.11 | $784K |
| Sale | Class A Common Stock | 2,839 | $85.77 | $244K |
Holdings After Transaction:
Stock Option — 37,500 shares (Direct, null);
Class A Common Stock — 105,401 shares (Direct, null)
Footnotes (1)
- The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.61 to $84.4, 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), (6), (7), and (8) to this Form 4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $84.63 to $85.6, inclusive. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.7 to $86.19, inclusive. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $81.22 to $82.07, inclusive. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $82.38 to $82.89, inclusive. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $83.85 to $84.5, inclusive. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.27 to $85.72, inclusive. The option is fully vested and exercisable.
Key Figures
Shares sold: 18,750 shares
Options exercised: 18,750 shares
Option exercise price: $13.89 per share
+3 more
6 metrics
Shares sold
18,750 shares
Open-market sales of Class A Common Stock on June 4–5, 2026
Options exercised
18,750 shares
Stock option exercises into Class A Common Stock
Option exercise price
$13.89 per share
Exercise or conversion price for stock options
Post-transaction holdings
100,002 shares
Direct Class A Common Stock owned after transactions
Reported sale prices
Low-to-mid $80s per share
Weighted average prices across multiple open-market sales
Rule 10b5-1 plan adoption date
March 5, 2026
Date the pre-arranged trading plan was adopted
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 underlying Class A Common Stock"
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" in multiple transactions"
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.
derivative security financial
"transaction_code_description: "Exercise or conversion of derivative security""
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
FAQ
What insider transactions did ACM Research (ACMR) report for Cheav Sotheara?
ACM Research officer Cheav Sotheara exercised options for 18,750 Class A shares and sold 18,750 shares in open-market trades on June 4–5, 2026. These transactions were reported on a Form 4 insider filing with post-transaction direct holdings of 100,002 shares.
Were ACMR insider sales by Cheav Sotheara made under a Rule 10b5-1 plan?
Yes. A footnote states the ACM Research insider sales were effected under a Rule 10b5-1 trading plan adopted on March 5, 2026. Such plans pre-schedule trades, indicating the timing is pre-arranged rather than reactive to short-term market developments.
What stock options did the ACMR officer exercise in this Form 4 filing?
The filing shows exercises of stock options covering 18,750 ACM Research Class A shares at an exercise price of $13.89 per share. One footnote notes the option is fully vested and exercisable, indicating the transactions involved previously vested equity awards.