Dun Haiping
SEC Form 4 insider trading activity
Dun Haiping has filed 4 SEC Form 4 filings (13 transaction rows) across 1 company, with disclosures dating back to 2025. 4 of those filings fall inside the rolling window. Most recent filing: Aug 20, 2026.
On the most recent filing, Dun Haiping is listed as Director at ACM Research, Inc. Inside the rolling window, Dun Haiping reported no open-market purchases and 3 open-market sales totaling $954K in ACMR. The largest disclosed transaction in the window is a sale of 5,000 ACMR shares on Aug 18, 2026, worth $406K.
Companies traded
Other insiders at ACMR
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$954K
reported sales (SEC code S)
Companies
1
in the rolling window
Frequently asked questions
How many SEC Form 4 filings has Dun Haiping made?
Dun Haiping has filed 4 SEC Form 4 filings (13 transaction rows) across 1 company since 2025.
Which companies does Dun Haiping trade?
Dun Haiping has filed SEC Form 4 disclosures for 1 company, including ACMR.
When was Dun Haiping's most recent SEC Form 4 filing?
Dun Haiping's most recent SEC Form 4 filing on Tracefour is dated Aug 20, 2026.
What is Dun Haiping's total buy and sell value in the current window?
Inside the rolling retention window, Dun Haiping bought $0 and sold $954K based on SEC Form 4 filings.
What was Dun Haiping's largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 5,000 ACMR shares on 2026-08-18, worth $406K, per SEC Form 4 filings.