WANG DAVID H

PrivateCIK: 1721580
Location

FREMONT, CA

WANG DAVID H (See Remarks) sold 12.1% of their position (110K shares) of ACM RESEARCH, INC. on the open market

Open‑market sale worth $5.15M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 5 sales
InsiderWANG DAVID HCIK 1721580
IssuerACM RESEARCH, INC.CIK 1680062
DirectorOfficer10% Owner· See Remarks
Since Jun 2018
-110K
Net shares
Net seller
$5.15M
Total sold
5
Open market trades
0B · 5S
9
Total transactions
110K acquired · 220K disposed
Non-Derivative Transactions7

Class A Common Stock

Direct
M · Option Exercise

Shares

+60K

Price / share

$1.00

Trade value

$60K

% of position

7.5%
3/11/2026
802.71K862.71K

Class A Common Stock

Direct
S · Sale

Shares

55.37K

Price / share

$47.89

Trade value

$2.65M

% of position

6.4%
3/11/2026
862.71K807.34K

Class A Common Stock

Direct
S · Sale

Shares

4.63K

Price / share

$48.34

Trade value

$223.67K

% of position

0.6%
3/11/2026
807.34K802.71K

Class A Common Stock

Direct
M · Option Exercise

Shares

+50K

Price / share

$1.00

Trade value

$50K

% of position

6.2%
3/12/2026
802.71K852.71K

Class A Common Stock

Direct
S · Sale

Shares

10.56K

Price / share

$44.92

Trade value

$474.40K

% of position

1.2%
3/12/2026
852.71K842.15K

Class A Common Stock

Direct
S · Sale

Shares

38.74K

Price / share

$45.74

Trade value

$1.77M

% of position

4.6%
3/12/2026
842.15K803.41K

Class A Common Stock

Direct
S · Sale

Shares

702.00

Price / share

$46.57

Trade value

$32.69K

% of position

0.1%
3/12/2026
803.41K802.71K
Total

Net shares

+0.00

Net value

-$5.04M

Derivative Transactions2

Stock Option

Direct
M · Option Exercise
Converts to

Class A Common Stock

60K shares

Shares

60K

Strike price

1

Held after

420K

Exercisable

3/11/2026

Stock Option

Direct
M · Option Exercise
Converts to

Class A Common Stock

50K shares

Shares

50K

Strike price

1

Held after

370K

Exercisable

3/12/2026
Non-Derivative Holdings (Post-Transaction)4

Class A Common Stock

Indirect
Shares owned100K

Class A Common Stock

Indirect
Shares owned620K

Class A Common Stock

Indirect
Shares owned45.84K

Class A Common Stock

Indirect
Shares owned180K
Total
945.84K indirect945.84K
Derivative Holdings (Post-Transaction)0
No derivative holdings reported
WANG DAVID H — Insider Transaction (Form 4) Filed Mar 13, 2026 | Finecho