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person · Reporting owner

Wang David H

Disclosed activity across 1 company

Tapewire entity
31958
SEC CIK
0001721580

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
ACM Research, Inc.ACMR · Entity 3926Director · See Remarks · 10% ownerSeptember 08, 2026September 10, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

ACM Research, Inc.

Report date September 08, 2026 · Filed September 10, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Class A Common StockSEC Table I · non-derivativeDirect802,708 Ending reported balance After 2026-09-09 transaction · row 11
11 source rows · reconciled sequence

Row 1 · 2026-09-08 · Exercise / conversion · Acquired 70,000 · Balance 872,708

Row 2 · 2026-09-08 · Sale · Disposed 4,803 · Balance 867,905

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.52 to $76.41, 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), (8), (9), and (10) to this Form 4.

Row 3 · 2026-09-08 · Sale · Disposed 51,374 · Balance 816,531

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.52 to $77.5, inclusive.

Row 4 · 2026-09-08 · Sale · Disposed 12,323 · Balance 804,208

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F4: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.52 to $78.48, inclusive.

Row 5 · 2026-09-08 · Sale · Disposed 1,500 · Balance 802,708

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F5: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $78.55 to $78.64, inclusive.

Row 6 · 2026-09-09 · Exercise / conversion · Acquired 70,000 · Balance 872,708

Row 7 · 2026-09-09 · Sale · Disposed 33,493 · Balance 839,215

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F6: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $73.26 to $74.21, inclusive.

Row 8 · 2026-09-09 · Sale · Disposed 18,934 · Balance 820,281

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F7: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $74.26 to $75.22, inclusive.

Row 9 · 2026-09-09 · Sale · Disposed 11,666 · Balance 808,615

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F8: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.28 to $75.95, inclusive.

Row 10 · 2026-09-09 · Sale · Disposed 4,807 · Balance 803,808

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F9: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.38 to $77.35, inclusive.

Row 11 · 2026-09-09 · Sale · Disposed 1,100 · Balance 802,708

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F10: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.59 to $77.59, inclusive.

Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $1.00 · Expires 2026-12-27Direct200,000 Reported balance After 2026-09-08 transaction · row 15 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 15 · 2026-09-08 · Exercise / conversion · Disposed 70,000 · Balance 200,000

F11: The option is fully vested and exercisable.

Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $1.00 · Expires 2026-12-27Direct130,000 Reported balance After 2026-09-09 transaction · row 16 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 16 · 2026-09-09 · Exercise / conversion · Disposed 70,000 · Balance 130,000

F11: The option is fully vested and exercisable.

Class A Common StockSEC Table I · non-derivativeIndirectBy Jing Chen, wife of David H. Wang100,002 Reported balance Holding disclosure · report date 2026-09-08 · row 12 Holding and transaction disclosures are not merged.
1 source row

Row 12 · Balance 100,002

Class A Common StockSEC Table I · non-derivativeIndirectBy David Hui Wang and Jing Chen Family Irrevocable Trust for Wang Children180,000 Reported balance Holding disclosure · report date 2026-09-08 · row 13 Holding and transaction disclosures are not merged.
1 source row

Row 13 · Balance 180,000

Class A Common StockSEC Table I · non-derivativeIndirectBy Wang-Chen Family Living Trust620,001 Reported balance Holding disclosure · report date 2026-09-08 · row 14 Holding and transaction disclosures are not merged.
1 source row

Row 14 · Balance 620,001

Filing footnotes · ownership attribution and instrument terms

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.52 to $76.41, 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), (8), (9), and (10) 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 $76.52 to $77.5, inclusive.

F4: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.52 to $78.48, inclusive.

F5: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $78.55 to $78.64, inclusive.

F6: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $73.26 to $74.21, inclusive.

F7: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $74.26 to $75.22, inclusive.

F8: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.28 to $75.95, inclusive.

F9: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.38 to $77.35, inclusive.

F10: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.59 to $77.59, inclusive.

F11: The option is fully vested and exercisable.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
September 09, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 70,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · derivative · entry 16

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 130,000

Underlying: Class A Common Stock · 70,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F11 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
September 09, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 1,100 $77.59 $85,349.00
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 11

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F10 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.59 to $77.59, inclusive.

Read SEC document
September 09, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 4,807 $76.73 $368,841.11
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 10

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 803,808

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F9 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.38 to $77.35, inclusive.

Read SEC document
September 09, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 11,666 $75.58 $881,716.28
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 9

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 808,615

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F8 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.28 to $75.95, inclusive.

Read SEC document
September 09, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 18,934 $74.67 $1,413,801.78
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 8

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 820,281

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F7 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $74.26 to $75.22, inclusive.

Read SEC document
September 09, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 33,493 $73.80 $2,471,783.40
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 7

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 839,215

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F6 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $73.26 to $74.21, inclusive.

Read SEC document
September 09, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 70,000 $1.00 $70,000.00
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 6

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 872,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 70,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · derivative · entry 15

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 200,000

Underlying: Class A Common Stock · 70,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F11 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 1,500 $78.57 $117,855.00
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 5

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F5 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $78.55 to $78.64, inclusive.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 12,323 $78.08 $962,179.84
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 4

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 804,208

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F4 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.52 to $78.48, inclusive.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 51,374 $77.15 $3,963,504.10
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 3

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 816,531

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.52 to $77.5, inclusive.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 4,803 $75.99 $364,979.97
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 2

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 867,905

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.52 to $76.41, 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), (8), (9), and (10) to this Form 4.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 70,000 $1.00 $70,000.00
Disclosure

SEC source: 0001140361-26-036191 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 872,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
June 04, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 40,002 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · derivative · entry 19

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 270,000

Underlying: Class A Common Stock · 40,002 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F13 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
June 04, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 826 $87.91 $72,613.66
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 13

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: 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.

F12 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $87.77 to $88.01, inclusive.

Read SEC document
June 04, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 8,581 $87.13 $747,662.53
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 12

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 803,534

F1 · kind: 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.

F11 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $86.73 to $87.66, inclusive.

Read SEC document
June 04, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 10,992 $86.07 $946,081.44
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 11

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 812,115

F1 · kind: 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.

F10 · price: 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 $86.57, inclusive.

Read SEC document
June 04, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 17,543 $85.11 $1,493,084.73
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 10

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 823,107

F1 · kind: 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.

F9 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $84.62 to $85.6, inclusive.

Read SEC document
June 04, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 2,060 $83.86 $172,751.60
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 9

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 840,650

F1 · kind: 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.

F8 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $83.61 to $84.24, inclusive.

Read SEC document
June 04, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 40,002 $1.00 $40,002.00
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 8

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 842,710

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 60,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · derivative · entry 18

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 310,002

Underlying: Class A Common Stock · 60,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F13 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 1,187 $93.04 $110,438.48
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 7

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: 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.

F7 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $93.02 to $93.39, inclusive.

Read SEC document
June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 5,843 $92.38 $539,776.34
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 6

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 803,895

F1 · kind: 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.

F6 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $92.01 to $92.8, inclusive.

Read SEC document
June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 9,925 $90.78 $900,991.50
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 5

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 809,738

F1 · kind: 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.

F5 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $90.24 to $91.22, inclusive.

Read SEC document
June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 32,450 $89.84 $2,915,308.00
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 4

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 819,663

F1 · kind: 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.

F4 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $89.24 to $90.22, inclusive.

Read SEC document
June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 6,295 $88.98 $560,129.10
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 3

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 852,113

F1 · kind: 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.

F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $88.24 to $89.22, inclusive.

Read SEC document
June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 4,300 $87.57 $376,551.00
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 2

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 858,408

F1 · kind: 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 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $87.22 to $88.04, 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), (8), (9), (10), (11), and (12) to this Form 4.

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June 03, 2026 Filed Jun 5, 2026 20:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 60,000 $1.00 $60,000.00
Disclosure

SEC source: 0001140361-26-024280 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 862,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

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May 13, 2026 Filed Jul 7, 2026 01:00 UTC ACM Research, Inc. ACMR · Entity 3926 GrantRestricted Stock Units · Derivative 6,208 $0.00 $0.00
Disclosure

SEC source: 0001140361-26-027691 · form4.xml · derivative · entry 5

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By Sophia Wang, daughter of David H. Wang

Disclosed balance after: 6,208

Underlying: Class A Common Stock · 6,208 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of ACMR common stock.

F2 · shares: The number of RSUs granted will be determined by dividing the applicable annual grant value by the 30-day lookback average fair market value of the Issuer's common stock, determined to be $51.54 per share.

F3 · derivative.exercise_date: The restricted stock units vest in four equal annual installments beginning May 13, 2027.

F3 · derivative.expiration_date: The restricted stock units vest in four equal annual installments beginning May 13, 2027.

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March 12, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 50,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · derivative · entry 13

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 370,002

Underlying: Class A Common Stock · 50,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_date: The option is fully vested and exercisable.

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March 12, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 702 $46.57 $32,692.14
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · nonDerivative · entry 7

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: 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.

F6 · price: 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.

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March 12, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 38,737 $45.74 $1,771,830.38
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · nonDerivative · entry 6

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 803,410

F1 · kind: 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.

F5 · price: 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.

Read SEC document
March 12, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 10,561 $44.92 $474,400.12
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · nonDerivative · entry 5

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 842,147

F1 · kind: 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.

F4 · price: 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.

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March 12, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 50,000 $1.00 $50,000.00
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · nonDerivative · entry 4

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 852,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
March 11, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 60,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · derivative · entry 12

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 420,002

Underlying: Class A Common Stock · 60,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
March 11, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 4,627 $48.34 $223,669.18
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · nonDerivative · entry 3

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: 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.

F3 · price: 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.

Read SEC document
March 11, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 55,373 $47.89 $2,651,812.97
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · nonDerivative · entry 2

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 807,335

F1 · kind: 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 · price: 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.

Read SEC document
March 11, 2026 Filed Mar 13, 2026 20:46 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 60,000 $1.00 $60,000.00
Disclosure

SEC source: 0001140361-26-009401 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 862,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
February 04, 2026 Filed Feb 6, 2026 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 GrantStock Option · Derivative 545,400 $0.00 Strike: $7.36 $0.00
Disclosure

SEC source: 0001140361-26-004200 · form4.xml · derivative · entry 5

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,636,197

Underlying: Class A Common Stock · 545,400 shares

Expires 2030-03-19

F1 · derivative.exercise_date: On March 20, 2020, the reporting person was granted options to purchase an aggregate of 1,636,197 shares of the Issuer's Class A common stock, based on the satisfaction of certain performance criteria. In general, one-third of the shares subject to the options vest and become exercisable upon an increase in the Issuer's market capitalization (calculated as described in footnote 2) of $1 billion, $2 billion and $3 billion, respectively, from the market capitalization of $553,383,586 on the date of grant. 545,400 shares vested and became exercisable on February 4, 2026, which was the first trading day as of which the Issuer's market capitalization equaled or exceeded $3,553,383,586.

F2 · derivative.exercise_date: For purposes of the options, the market capitalization as of a specified trading day is calculated by multiplying (a) the average of the daily volume-weighted average price per share of the Issuer's Class A common stock for each of the trading days occurring during the thirty calendar day period ending on that specified trading day by (b) the total number of issued and outstanding shares of the Issuer's Class A and Class B common stock as of 11:59 p.m. (Eastern time) on such specified trading day.

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December 04, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 60,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · derivative · entry 12

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 480,002

Underlying: Class A Common Stock · 60,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
December 04, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 40,183 $34.42 $1,383,098.86
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · nonDerivative · entry 6

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024.

F5 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $34.18 to $34.63, inclusive.

Read SEC document
December 04, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 19,817 $33.52 $664,265.84
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · nonDerivative · entry 5

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 842,891

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $33.07 to $34.04, inclusive.

Read SEC document
December 04, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 60,000 $1.00 $60,000.00
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · nonDerivative · entry 4

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 862,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
December 03, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 70,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · derivative · entry 11

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 540,002

Underlying: Class A Common Stock · 70,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
December 03, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 1,200 $33.56 $40,272.00
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · nonDerivative · entry 3

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 802,708

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024.

F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $33.53 to $33.59, inclusive.

Read SEC document
December 03, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 SaleClass A Common Stock 68,800 $33.05 $2,273,840.00
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · nonDerivative · entry 2

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 803,908

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $32.51 to $33.48, 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.

Read SEC document
December 03, 2025 Filed Dec 5, 2025 21:30 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 70,000 $1.00 $70,000.00
Disclosure

SEC source: 0001140361-25-044559 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 872,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
October 27, 2025 Filed Oct 30, 2025 01:30 UTC ACM Research, Inc. ACMR · Entity 3926 GrantStock Option · Derivative 545,400 $0.00 Strike: $7.36 $0.00
Disclosure

SEC source: 0001140361-25-039758 · form4.xml · derivative · entry 5

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 545,400

Underlying: Class A Common Stock · 545,400 shares

Expires 2030-03-19

F1 · derivative.exercise_date: On March 20, 2020, the reporting person was granted options to purchase an aggregate of 1,636,197 shares of the Issuer's Class A common stock, based on the satisfaction of certain performance criteria. In general, one-third of the shares subject to the options vest and become exercisable upon an increase in the Issuer's market capitalization (calculated as described in footnote 2) of $1 billion, $2 billion and $3 billion, respectively, from the market capitalization of $553,383,586 on the date of grant. 545,400 shares vested and became exercisable on October 27, 2025, which was the first trading day as of which the Issuer's market capitalization equaled or exceeded $2,553,383,586. The remaining shares will vest and become exercise upon the first trading days, if any, on which the Issuer's market capitalization equals or exceeds $3,553,383,586.

F2 · derivative.exercise_date: For purposes of the options, the market capitalization as of a specified trading day is calculated by multiplying (a) the average of the daily volume-weighted average price per share of the Issuer's Class A common stock for each of the trading days occurring during the thirty calendar day period ending on that specified trading day by (b) the total number of issued and outstanding shares of the Issuer's Class A and Class B common stock as of 11:59 p.m. (Eastern time) on such specified trading day.

Read SEC document
September 08, 2025 Filed Oct 1, 2025 01:33 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionStock Option · Derivative 130,000 $0.00 Strike: $1.00 $0.00
Disclosure

SEC source: 0001140361-25-036835 · form4.xml · derivative · entry 6

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 610,002

Underlying: Class A Common Stock · 130,000 shares

Expires 2026-12-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On September 8, 2025, the reporting person exercised, by net exercise, a previously issued stock option to purchase 130,000 shares of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
September 08, 2025 Filed Oct 1, 2025 01:33 UTC ACM Research, Inc. ACMR · Entity 3926 Exercise / conversionClass A Common Stock 130,000 $1.00 $130,000.00
Disclosure

SEC source: 0001140361-25-036835 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See Remarks · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 802,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On September 8, 2025, the reporting person exercised, by net exercise, a previously issued stock option to purchase 130,000 shares of Class A Common Stock of the Issuer.

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.