MCKECHNIE MARK (See Remarks) sold 97.2% of their position (31.25K shares) of ACM RESEARCH, INC. on the open market

Open‑market sale worth $1.09M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

MCKECHNIE MARK

Filed: 12/8/2025ACC: 0001140361-25-044909

InsiderMCKECHNIE MARKCIK 1775007

→

IssuerACM RESEARCH, INC.CIK 1680062

Officer· See Remarks

Since Jun 2019

-31.25K

Net shares

Net seller

$1.09M

Total sold

Open market trades

0B · 3S

Total transactions

31.25K acquired · 62.50K disposed

Non-Derivative Transactions5

Class A Common Stock

Direct

M · Option Exercise

+8.75K

Price / share

$4.55

Trade value

$39.81K

% of position

972.2%

12/4/2025

900.00→9.65K

Class A Common Stock

Direct

S · Sale

−7.75K

Price / share

$33.50

Trade value

$259.76K

% of position

80.4%

12/4/2025

9.65K→1.90K

Class A Common Stock

Direct

S · Sale

−996.00

Price / share

$34.26

Trade value

$34.12K

% of position

52.5%

12/4/2025

1.90K→900.00

Class A Common Stock

Direct

M · Option Exercise

+22.50K

Price / share

$25.45

Trade value

$572.63K

% of position

2500.0%

12/8/2025

900.00→23.40K

Class A Common Stock

Direct

S · Sale

−22.50K

Price / share

$35.45

Trade value

$797.63K

% of position

96.2%

12/8/2025

23.40K→900.00

Total

Net shares

+0.00

Net value

-$479.07K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	12/4/2025	M · Option Exercise	+8.75K	$4.55	$39.81K	972.2%	900.00	9.65K
Class A Common Stock Direct	12/4/2025	S · Sale	−7.75K	$33.50	$259.76K	80.4%	9.65K	1.90K
Class A Common Stock Direct	12/4/2025	S · Sale	−996.00	$34.26	$34.12K	52.5%	1.90K	900.00
Class A Common Stock Direct	12/8/2025	M · Option Exercise	+22.50K	$25.45	$572.63K	2500.0%	900.00	23.40K
Class A Common Stock Direct	12/8/2025	S · Sale	−22.50K	$35.45	$797.63K	96.2%	23.40K	900.00
Total			+0.00		-$479.07K

Derivative Transactions2

Stock Option

Direct

M · Option Exercise

Converts to

Class A Common Stock

8.75K shares

−8.75K

Strike price

4.55

Held after

0.00

Exercisable

—

12/4/2025

Stock Option

Direct

M · Option Exercise

Converts to

Class A Common Stock

22.50K shares

−22.50K

Strike price

25.45

Held after

0.00

Exercisable

—

12/8/2025

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option Direct	Class A Common Stock8.75K shares	12/4/2025	M · Option Exercise	−8.75K	4.55	—	0.00
Stock Option Direct	Class A Common Stock22.50K shares	12/8/2025	M · Option Exercise	−22.50K	25.45	—	0.00