DUN HAIPING sold 5K shares of ACM RESEARCH, INC. on the open market
Open‑market sale worth $331.1K. Review remaining holdings and any 10b5‑1 plan disclosures.
S · 4 sales
Filed: 5/21/2026ACC: 0001140361-26-022458
-5K
Net shares
Net seller
$331.1K
Total sold
4
Open market trades
0B · 4S
6
Total transactions
5K acquired · 10K disposed
Non-Derivative Transactions5
Class A Common Stock
Direct
Shares
+5K
Price / share
$5.60
Trade value
$28K
% of position
New position
5/19/2026
0.00→5K
Class A Common Stock
Direct
Shares
−1.33K
Price / share
$63.84
Trade value
$85.10K
% of position
26.7%
5/19/2026
5K→3.67K
Class A Common Stock
Direct
Shares
−500.00
Price / share
$65.09
Trade value
$32.55K
% of position
13.6%
5/19/2026
3.67K→3.17K
Class A Common Stock
Direct
Shares
−1.31K
Price / share
$67.21
Trade value
$87.98K
% of position
41.3%
5/19/2026
3.17K→1.86K
Class A Common Stock
Direct
Shares
−1.86K
Price / share
$67.54
Trade value
$125.49K
% of position
New position
5/19/2026
1.86K→0.00
Total
Net shares
+0.00
Net value
-$303.11K
| Security | Date | Type | Shares | Price / Share | Trade Value | % of Position | Held Before | Held After |
|---|---|---|---|---|---|---|---|---|
| Class A Common Stock Direct | 5/19/2026 | M · Option Exercise | +5K | $5.60 | $28K | New position | 0.00 | 5K |
| Class A Common Stock Direct | 5/19/2026 | S · Sale | −1.33K | $63.84 | $85.10K | 26.7% | 5K | 3.67K |
| Class A Common Stock Direct | 5/19/2026 | S · Sale | −500.00 | $65.09 | $32.55K | 13.6% | 3.67K | 3.17K |
| Class A Common Stock Direct | 5/19/2026 | S · Sale | −1.31K | $67.21 | $87.98K | 41.3% | 3.17K | 1.86K |
| Class A Common Stock Direct | 5/19/2026 | S · Sale | −1.86K | $67.54 | $125.49K | New position | 1.86K | 0.00 |
| Total | +0.00 | -$303.11K | ||||||
Derivative Transactions1
Stock Option
Direct
Converts to
Class A Common Stock
5K shares
Shares
−5K
Strike price
5.6
Held after
50K
Exercisable
—
5/19/2026
| Security | Converts To | Date | Type | Shares | Strike Price | Exercisable | Held After |
|---|---|---|---|---|---|---|---|
| Stock Option Direct | Class A Common Stock5K shares | 5/19/2026 | M · Option Exercise | −5K | 5.6 | — | 50K |
Non-Derivative Holdings (Post-Transaction)2
Class A Common Stock
IndirectShares owned755.09K
Class A Common Stock
IndirectShares owned100K
Total
855.09K indirect855.09K
| Security Title | Shares Owned | Ownership Type |
|---|---|---|
| Class A Common Stock | 755.09K | Indirect |
| Class A Common Stock | 100K | Indirect |
| Total | 855.09K | 855.09K indirect |
Derivative Holdings (Post-Transaction)0
No derivative holdings reported