Form 4: Director Charles Pappis Executes ACMR Stock Option Plan

ACM Research Director Charles Pappis exercised options and sold 5,000 shares of Class A Common Stock under a 10b5-1 plan.

Summary

• Director Charles Pappis exercised stock options for 5,000 shares of Class A Common Stock at a strike price of $29.18.
• Following the exercise, the director sold the entire 5,000 shares at a market price of $52.00 per share.
• The transaction was executed pursuant to a Rule 10b5-1 trading plan adopted on November 20, 2025.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event, as the transaction was pre-planned and represents standard liquidity management by a director.

Positives

• The transaction was pre-planned under a Rule 10b5-1 trading plan, indicating the sale was not based on non-public information.
• The director successfully exercised fully vested options, demonstrating alignment with long-term equity compensation.

Negatives

• The director reduced their direct beneficial ownership of ACMR shares to zero following the sale.

Risks

• None identified; this is a routine disclosure of executive equity transactions.

Future Outlook

No forward-looking guidance provided in this document.

Industry Context

StockSavvy.ai notes that insider sales executed via 10b5-1 plans are standard corporate practice and generally do not signal a change in company fundamentals or management sentiment.

Comparison to Industry Standards

• The use of Rule 10b5-1 plans is the industry standard for corporate insiders to sell shares while avoiding potential accusations of insider trading.

Stakeholder Impact

• Minimal impact on shareholders as the sale was conducted through a pre-established 10b5-1 plan.

Next Steps

• None

Key Dates

Keywords

ACMR, ACM Research, Insider Trading, Form 4, Stock Option Exercise, 10b5-1 Plan