ACMR ACM Research, Inc. Insider Trading

Sotheara Cheav executes 7 sales totaling 18,750 shares for $1,585,923.42 ($1.6M) under pre-arranged 10b5-1 plan

Sotheara Cheav sold 18,750 shares across 7 separate transactions on June 4–5, 2026 at prices ranging from $81.73 to $85.77, raising $1,585,923.42. This activity was pre-arranged under a 10b5-1 trading plan adopted on 2026-03-05, meaning the sales were scheduled and not discretionary responses to current market conditions. Post-transaction, Cheav retains 100,002 non-derivative shares and holds an additional 80,399 shares via derivative securities (two stock option grants: 42,899 and 37,500 shares), so the position remains active despite the sale. The sales occurred during a period of significant momentum—the stock has gained 37.8% in the 30-day period and 69.8% over 90 days, recovering substantially from its 52-week low. Investors should note that the 10b5-1 framework removes any inference of timing-based decision-making; the trades follow a pre-set schedule established three months prior.

David H Wang sells 100,002 shares of ACMR for $8.8M across 11 transactions, scheduled via 10b5-1 plan adopted 2024-11-29.

David H Wang executed 11 separate sales totaling 100,002 shares for $8,835,388.38 at a blended average price of $88.35, reducing his non-derivative holdings from 902.7K to 802.7K shares. This transaction is scheduled under a pre-arranged 10b5-1 trading plan adopted on 2024-11-29, eliminating discretionary timing as a factor. The insider retains substantial derivative holdings of 580,002 shares (310,002 from one stock option grant and 270,000 from another). Prior sales by this insider at ACMR (completed 2026-03-11 and 2026-03-12) showed 30-day returns ranging from -0.6% to +7.0%, with consistent 90-day gains between +86.6% and +100.8%, suggesting the stock appreciated following recent prior sales. The current stock price of $76.29 is 19.0% below the 52-week high of $94.21, trading well below the average execution price of $88.35 achieved in this filing.

David H Wang sold 110,000 ACMR shares for $5.2M (blended avg $46.86) across 5 transactions on March 11–12, 2026.

Wang executed 5 separate sales totaling 110,000 shares for $5,154,404.79, reducing his holdings from 912.7K to 802.7K shares (-12.1%). The sales occurred at prices between $44.92 and $48.34, slightly above the current market price of $46.38 and well below the 52-week high of $70.68. Wang's prior trades at ACMR show a concerning pattern: all 5 prior sells have resulted in positive 90-day returns (ranging from +28.4% to +57.2%), meaning the stock rose after each sale—a 0% well-timed rate at this ticker. His cross-ticker track record shows a 35% well-timed rate with an average 90-day return of +16.7% after sells. The current sale occurs while the stock is down 34.4% from its 52-week high, yet the company shows solid fundamentals (P/E of 6.11, +15.2% annual revenue growth, $35.9M net income on $269.2M revenue). The consistent pattern of subsequent gains following his prior ACMR sales, combined with the current depressed valuation relative to recent highs, suggests this sale does not reflect a well-established timing advantage.

McKechnie Mark sold 98,551 shares (99.1% of holdings) for $4,491,951.58 via scheduled 10b5-1 plan on 2026-03-12.

McKechnie Mark executed 6 separate sales totaling 98,551 shares for $4,491,951.58 on 2026-03-12, reducing his position from 99,451 shares to 900 shares—a near-complete liquidation of 99.1% of his holdings at blended average price $45.58. This transaction is part of a pre-arranged 10b5-1 trading plan adopted on 2025-08-27, meaning the execution was scheduled rather than discretionary at the time of filing. The magnitude of the divestiture—nearly the entire stake—represents a substantial reduction in insider holdings, though the scheduled nature of the 10b5-1 plan constrains what timing inferences can be drawn. Investors should note the scale of the position reduction alongside the pre-arranged framework under which it occurred.

Director Liu Tracy sold 60,000 shares at $47.51 blended avg (2.9M) on 3/10-3/11 under 10b5-1 plan adopted 12/04/25

Director Tracy Liu sold 60,000 shares (35.1% of pre-transaction holdings) across four separate transactions over two trading days, generating gross proceeds of $2,850,781.80 at a blended average price of $47.51. The sales were executed under a pre-arranged 10b5-1 trading plan adopted on 2025-12-04, making them scheduled rather than discretionary trades. Liu retains 110,772 shares post-transaction, maintaining a meaningful equity stake in ACM Research. The structured, pre-arranged nature of this divestiture precludes attribution to market timing or conviction signals.

Feng Lisa (Director/Officer) sells 30,000 shares ($1.4M) across 4 transactions via pre-arranged 10b5-1 plan.

Feng Lisa executed 4 separate sales totaling 30,000 shares for $1,441,290.50 on March 5-6, 2026, reducing holdings from 80,001 shares to 50,001 shares. This transaction is part of a pre-arranged 10b5-1 trading plan adopted on 2025-12-02, meaning it was scheduled and not discretionary. The blended average sale price was $48.04 across the multiple transactions. As a Rule 10b5-1 plan execution, this sale reflects a predetermined schedule rather than a market-driven decision, and therefore does not signal discretionary conviction regarding ACMR's valuation or near-term outlook.

McKechnie sold 31,250 shares at blended avg $34.93 for $1,091,506.96 via scheduled 10b5-1 plan

Mark McKechnie executed 3 separate sales totaling 31,250 shares for $1,091,506.96 on ACMR, reducing his position by 97.2% from 32,150 to 900 shares post-transaction. The sales occurred at prices ranging from $33.50 to $35.45 across three days (2025-12-04 and 2025-12-08). This transaction is governed by a 10b5-1 trading plan adopted on 2025-08-27, meaning the timing and volume were pre-arranged rather than discretionary decisions made in response to current market conditions. The near-complete liquidation of a substantial holding warrants investor attention to any available context regarding the plan's adoption and the current business environment at ACMR.

David H Wang sold 130,000 shares ($4.4M) at ACM Research via pre-arranged 10b5-1 plan.

David H Wang executed 4 separate sales totaling 130,000 shares for $4,361,476.70 across December 3–4, 2025, at prices ranging from $33.05 to $34.42 (blended average $33.55). This transaction is part of a pre-arranged 10b5-1 trading plan adopted on 2024-11-29, making it scheduled rather than discretionary. Post-transaction holdings of 802,708 shares represent a 13.9% reduction from pre-transaction holdings of 932,708 shares. Because the trade is scheduled under 10b5-1, it reflects a pre-established divestment commitment rather than a response to current market or business conditions.

Chen Fuping sold 120,000 shares of ACMR for $3,981,156.00 under pre-arranged 10b5-1 plan; now holds zero shares.

Chen Fuping executed 3 separate sales totaling 120,000 shares for $3,981,156.00 at an average price of $33.18 on December 2-3, 2025. The sales resulted in complete liquidation of his position, reducing holdings from 120,000 shares to zero. This transaction was executed under a pre-arranged 10b5-1 trading plan adopted on 2025-08-28, indicating the sales were scheduled rather than discretionary. As a scheduled plan, the timing reflects predetermined commitments rather than Chen's current assessment of company prospects at the transaction date.

Wang Jian sold 30,000 shares of ACMR at $35.00 on 2025-09-18 under pre-arranged 10b5-1 plan

Wang Jian executed a sale of 30,000 shares (30.0K shares) valued at $1,050,000.00 ($1.0M) as part of a pre-arranged 10b5-1 trading plan adopted on 2025-05-20, making this a scheduled transaction rather than a discretionary trade. The sale reduced his holdings from 283,158 shares (283.2K shares) to 253,158 shares (253.2K shares), representing a -10.6% reduction in his position. Since the transaction is governed by a pre-established plan, it does not carry timing signals or reflect real-time conviction about the company's prospects at the point of execution.