WANG DAVID H

PrivateCIK: 1721580
Location

FREMONT, CA

WANG DAVID H (See Remarks) sold 14.9% of their position (140K shares) of ACM RESEARCH, INC. on the open market

Open‑market sale worth $10.63M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 9 sales
InsiderWANG DAVID HCIK 1721580
IssuerACM RESEARCH, INC.CIK 1680062
DirectorOfficer10% Owner· See Remarks
Since Jun 2018
-140K
Net shares
Net seller
$10.63M
Total sold
9
Open market trades
0B · 9S
13
Total transactions
140K acquired · 280K disposed
Non-Derivative Transactions11

Class A Common Stock

Direct
M · Option Exercise

Shares

+70K

Price / share

$1.00

Trade value

$70K

% of position

8.7%
9/8/2026
802.71K872.71K

Class A Common Stock

Direct
S · Sale

Shares

4.80K

Price / share

$75.99

Trade value

$364.98K

% of position

0.6%
9/8/2026
872.71K867.90K

Class A Common Stock

Direct
S · Sale

Shares

51.37K

Price / share

$77.15

Trade value

$3.96M

% of position

5.9%
9/8/2026
867.90K816.53K

Class A Common Stock

Direct
S · Sale

Shares

12.32K

Price / share

$78.08

Trade value

$962.18K

% of position

1.5%
9/8/2026
816.53K804.21K

Class A Common Stock

Direct
S · Sale

Shares

1.50K

Price / share

$78.57

Trade value

$117.85K

% of position

0.2%
9/8/2026
804.21K802.71K

Class A Common Stock

Direct
M · Option Exercise

Shares

+70K

Price / share

$1.00

Trade value

$70K

% of position

8.7%
9/9/2026
802.71K872.71K

Class A Common Stock

Direct
S · Sale

Shares

33.49K

Price / share

$73.80

Trade value

$2.47M

% of position

3.8%
9/9/2026
872.71K839.22K

Class A Common Stock

Direct
S · Sale

Shares

18.93K

Price / share

$74.67

Trade value

$1.41M

% of position

2.3%
9/9/2026
839.22K820.28K

Class A Common Stock

Direct
S · Sale

Shares

11.67K

Price / share

$75.58

Trade value

$881.72K

% of position

1.4%
9/9/2026
820.28K808.62K

Class A Common Stock

Direct
S · Sale

Shares

4.81K

Price / share

$76.73

Trade value

$368.84K

% of position

0.6%
9/9/2026
808.62K803.81K

Class A Common Stock

Direct
S · Sale

Shares

1.10K

Price / share

$77.59

Trade value

$85.35K

% of position

0.1%
9/9/2026
803.81K802.71K
Total

Net shares

+0.00

Net value

-$10.49M

Derivative Transactions2

Stock Option

Direct
M · Option Exercise
Converts to

Class A Common Stock

70K shares

Shares

70K

Strike price

1

Held after

200K

Exercisable

9/8/2026

Stock Option

Direct
M · Option Exercise
Converts to

Class A Common Stock

70K shares

Shares

70K

Strike price

1

Held after

130K

Exercisable

9/9/2026
Non-Derivative Holdings (Post-Transaction)3

Class A Common Stock

Indirect
Shares owned100K

Class A Common Stock

Indirect
Shares owned620K

Class A Common Stock

Indirect
Shares owned180K
Total
900K indirect900K
Derivative Holdings (Post-Transaction)0
No derivative holdings reported
WANG DAVID H — Insider Transaction (Form 4) Filed Sep 10, 2026 | Finecho