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Detailed Insider History for:
ACM RESEARCH INC: ACMR
Price: 3/13/26 52-Wk
High		 52-Wk
Low		 Mkt Cap (mm) Shrs Out (mm) 3-Mth Ave
Vol (m)		 Ind. Yield Short Int
% Float		 Inst. Owned Insider Owned
$46.38 $71.65 $16.82 $3,048 61 1,509 0.0% 5.9% 79.11% 14.79%
Exch Sector Industry Sub-Industry
NasdaqGM Manufacturing Industrial And Commercial Machinery And Computer Equipment Special Industry Machinery, N E C
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Insider Statistics
T N H M S
Filer Name
Insider Title
Trans Type
Dollar Value
Shares Traded
Trans Date From
Trans Date To
Trans Price From
Trans Price To
Total Holdings
Delta % Owned
Owned
Other Info
Input Date
1
    
 
MCKECHNIE MARK
O
OS
$4,491,952
98,551
---
3/12/26
$44.89
$46.57
900
-99.1
D
10b
3/13/26 - 9:30:44 pm
2
    
 
MCKECHNIE MARK
O
OE
$1,584,759
98,551
---
3/12/26
$13.89
$19.49
60,900
---
D
10b
3/13/26 - 9:30:44 pm
3
1y
14
36%
25%
1
WANG DAVID H
DIR,BO
OS
$5,154,405
110,000
3/11/26
3/12/26
$44.92
$46.57
802,708
-12.1
D
10b
3/13/26 - 4:46:00 pm
4
    
 
WANG DAVID H
DIR,BO
OE
$110,000
110,000
3/11/26
3/12/26
---
$1.00
862,708
14.6
D
10b
3/13/26 - 4:46:00 pm
5
1y
6
83%
-22%
1
LIU TRACY
DIR
OS
$2,850,782
60,000
3/10/26
3/11/26
$47.06
$48.25
110,772
-35.1
D
10b
3/12/26 - 4:30:25 pm
6
    
 
LIU TRACY
DIR
OE
$60,000
60,000
3/10/26
3/11/26
---
$1.00
155,772
62.6
D
10b
3/12/26 - 4:30:25 pm
7
    
 
DUN HAIPING
DIR
OS
$217,363
5,000
---
3/9/26
$43.37
$43.94
---
All
D
10b
3/11/26 - 4:30:26 pm
8
    
 
DUN HAIPING
DIR
OE
$28,000
5,000
---
3/9/26
---
$5.60
5,000
New
D
10b
3/11/26 - 4:30:26 pm
9
    
 
FENG LISA
O
OS
$1,441,291
30,000
3/5/26
3/6/26
$46.07
$46.58
50,001
-37.5
D
10b
3/9/26 - 4:30:30 pm
10
    
 
FENG LISA
O
OE
$136,500
30,000
3/5/26
3/6/26
---
$4.55
65,001
85.7
D
10b
3/9/26 - 4:30:30 pm
11
1w
1
0%
0%
2
PAPPIS CHARLES C
DIR
OS
$250,450
5,000
---
3/5/26
---
$50.09
---
All
D
10b
3/9/26 - 4:30:32 pm
12
    
 
PAPPIS CHARLES C
DIR
OE
$145,900
5,000
---
3/5/26
---
$29.18
5,000
New
D
10b
3/9/26 - 4:30:32 pm
13
    
 
MCKECHNIE MARK
O
OS
$1,091,507
31,250
12/4/25
12/8/25
$33.50
$35.45
900
-97.2
D
10b
12/8/25 - 9:00:09 pm
14
    
 
MCKECHNIE MARK
O
OE
$612,438
31,250
12/4/25
12/8/25
$4.55
$25.45
23,400
---
D
10b
12/8/25 - 9:00:09 pm
15
1y
14
36%
25%
1
WANG DAVID H
DIR,BO
OS
$4,361,477
130,000
12/3/25
12/4/25
$33.05
$34.42
802,708
-13.9
D
10b
12/5/25 - 4:30:35 pm
16
    
 
WANG DAVID H
DIR,BO
OE
$130,000
130,000
12/3/25
12/4/25
---
$1.00
872,708
17.5
D
10b
12/5/25 - 4:30:35 pm
17
    
 
CHEN FUPING
O
OS
$3,981,156
120,000
12/2/25
12/3/25
$33.05
$33.57
---
All
D
10b
12/4/25 - 4:30:15 pm
18
    
 
CHEN FUPING
O
OE
$212,400
120,000
12/2/25
12/3/25
---
$1.77
100,000
---
D
10b
12/4/25 - 4:30:15 pm
19
    
 
FENG LISA
O
OS
$997,950
30,000
11/12/25
11/13/25
$32.76
$33.77
50,001
-37.5
D
10b
11/14/25 - 4:30:28 pm
20
    
 
FENG LISA
O
OE
$168,000
30,000
11/12/25
11/13/25
---
$5.60
65,001
85.7
D
10b
11/14/25 - 4:30:28 pm
21
    
 
DUN HAIPING
DIR
JS
---
755,090
---
11/12/25
---
---
---
All
D
---
11/14/25 - 4:33:08 pm
22
    
 
WANG JIAN
O
OS
$1,050,000
30,000
---
9/18/25
---
$35.00
253,158
-10.6
D
10b
9/19/25 - 4:30:13 pm
23
    
 
WANG JIAN
O
OE
$168,000
30,000
---
9/18/25
---
$5.60
283,158
11.9
D
10b
9/19/25 - 4:30:13 pm
24
1y
11
45%
17%
1
CHEAV SOTHEARA
O
OS
$350,000
10,000
---
9/18/25
---
$35.00
100,002
-9.1
D
10b
9/19/25 - 4:30:11 pm
25
    
 
CHEAV SOTHEARA
O
OE
$138,900
10,000
---
9/18/25
---
$13.89
110,002
10.0
D
10b
9/19/25 - 4:30:11 pm
26
1y
6
83%
-22%
1
LIU TRACY
DIR
OS
$495,000
15,000
---
9/17/25
---
$33.00
110,772
-11.9
D
10b
9/19/25 - 4:30:14 pm
27
    
 
LIU TRACY
DIR
OE
$15,000
15,000
---
9/17/25
---
$1.00
125,772
13.5
D
10b
9/19/25 - 4:30:14 pm
28
1y
10
60%
72%
1
WANG DAVID H
DIR,BO
OB
$130,000
130,000
---
9/8/25
---
$1.00
802,708
19.3
D
---
9/30/25 - 9:33:03 pm
29
1y
14
36%
25%
1
WANG DAVID H
DIR,BO
AS
$3,459,787
130,000
9/3/25
9/4/25
---
$26.44
672,708
-16.2
D
10b
9/5/25 - 4:30:33 pm
30
    
 
WANG DAVID H
DIR,BO
OE
$130,000
130,000
9/3/25
9/4/25
---
$1.00
742,708
21.2
D
10b
9/5/25 - 4:30:33 pm
31
    
 
WANG JIAN
O
OS
$1,860,000
60,000
8/22/25
8/25/25
$30.00
$32.00
253,158
-19.2
D
10b
8/26/25 - 4:30:25 pm
32
    
 
WANG JIAN
O
OE
$336,000
60,000
8/22/25
8/25/25
---
$5.60
283,158
26.9
D
10b
8/26/25 - 4:30:25 pm
33
1y
11
45%
17%
1
CHEAV SOTHEARA
O
OS
$334,560
11,152
---
8/22/25
---
$30.00
100,002
-10.0
D
10b
8/26/25 - 4:30:38 pm
34
    
 
CHEAV SOTHEARA
O
OE
$154,901
11,152
---
8/22/25
---
$13.89
111,154
11.2
D
10b
8/26/25 - 4:30:38 pm
35
1y
6
83%
-22%
1
LIU TRACY
DIR
OS
$450,000
15,000
---
7/15/25
---
$30.00
110,772
-11.9
D
10b
7/17/25 - 4:30:25 pm
36
    
 
LIU TRACY
DIR
OE
$15,000
15,000
---
7/15/25
---
$1.00
125,772
13.5
D
10b
7/17/25 - 4:30:25 pm
37
    
 
FENG LISA
O
OS
$420,000
15,000
---
7/7/25
---
$28.00
50,001
-23.1
D
10b
7/9/25 - 4:30:11 pm
38
    
 
FENG LISA
O
OE
$84,000
15,000
---
7/7/25
---
$5.60
65,001
30.0
D
10b
7/9/25 - 4:30:11 pm
39
    
 
FENG LISA
O
OS
$390,000
15,000
---
6/24/25
---
$26.00
50,001
-23.1
D
10b
6/26/25 - 4:30:28 pm
40
    
 
FENG LISA
O
OE
$84,000
15,000
---
6/24/25
---
$5.60
65,001
30.0
D
10b
6/26/25 - 4:30:28 pm
41
1y
14
36%
25%
1
WANG DAVID H
DIR,BO
OS
$3,009,804
130,000
5/21/25
5/22/25
---
$22.63
672,708
-16.2
D
10b
5/23/25 - 4:35:16 pm
42
    
 
WANG DAVID H
DIR,BO
OE
$130,000
130,000
5/21/25
5/22/25
---
$1.00
742,708
21.2
D
10b
5/23/25 - 4:35:16 pm
43
    
 
MCKECHNIE MARK
O
OS
$378,300
15,000
---
5/14/25
---
$25.22
900
-94.3
D
10b
5/16/25 - 4:30:27 pm
44
    
 
MCKECHNIE MARK
O
OE
$84,000
15,000
---
5/14/25
---
$5.60
15,900
1,666.7
D
10b
5/16/25 - 4:30:27 pm
45
1y
4
75%
-7%
4
HU CHENMING
DIR
AS
$4,899,240
163,308
---
3/17/25
---
$30.00
100,002
-62.0
D
10b
3/19/25 - 9:30:25 pm
46
    
 
PAPPIS CHARLES C
DIR
3
---
---
---
3/15/25
---
---
---
---
---
---
5/21/25 - 9:30:29 pm
47
    
 
DUN HAIPING
DIR
AS
$275,976
9,518
---
3/14/25
$28.32
$29.23
755,090
-1.2
D
10b
3/18/25 - 9:30:20 pm
48
1y
14
36%
25%
1
WANG DAVID H
DIR,BO
AS
$3,546,554
131,250
3/11/25
3/13/25
$26.57
$27.65
672,708
-16.3
D
10b
3/13/25 - 9:30:32 pm
49
    
 
MCKECHNIE MARK
O
OS
$411,300
15,000
---
3/12/25
---
$27.42
900
-94.3
D
10b
3/14/25 - 9:30:18 pm
50
    
 
MCKECHNIE MARK
O
OE
$84,000
15,000
---
3/12/25
---
$5.60
15,900
1,666.7
D
10b
3/14/25 - 9:30:18 pm
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