Arkolith/Insider Trading/ACMR/Form 4

Dun Haiping

DirectorACM Research, Inc. (ACMR) · full profile →Form 4 · filed May 21, 2026
Net Selling
Open-Market Buys
$0
Open-Market Sells
$331K
Net Open-Market Flow
-$331K
Transactions
6
5 non-derivative · 1 derivative

Non-Derivative Transactions (Table I)

DateActionSharesPriceValueOwned After
May 19, 2026Option exercise(M)5K$5.60$28K5K
May 19, 2026Sell(S)1K$63.84$85K4K
May 19, 2026Sell(S)500$65.09$33K3K
May 19, 2026Sell(S)1K$67.21$88K2K
May 19, 2026Sell(S)2K$67.54$125K0

Derivative Transactions (Table II)

DateActionSharesPriceValueOwned After
May 19, 2026Option exercise(M)5K—$050K

Transaction Codes

M
Option exercise / conversion
S
Open-market sale

Data Source & Provenance

Parsed from a single SEC EDGAR Form 4 filing (accession 0001140361-26-022458) within minutes of acceptance. Every field above traces to the original document. Verify it directly:

View original filing on SEC.govRaw Form 4 XML

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