Insiders who reported open-market trades in the last 12 months at the companies Haiping Dun files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
David H. Wang - $28.98M in ACMR purchases and sales in the last 12 months
Mark McKechnie - $8.76M in ACMR purchases and sales in the last 12 months
Fuping Chen - $3.98M in ACMR purchases and sales in the last 12 months
Tracy Liu - $2.85M in ACMR purchases and sales in the last 12 months
Lisa Feng - $2.44M in ACMR purchases and sales in the last 12 months
Sotheara Cheav - $1.59M in ACMR purchases and sales in the last 12 months
More insiders (A-Z)
Browse nearby insider profiles in alphabetical order.
Haiping Dun is a corporate insider, tracked as Director of ACM Research, Inc. (ACMR). InsiderAlpha holds 9 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Haiping Dun submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Has Haiping Dun been buying or selling stock?
Recorded transactions: 0 open-market purchases and 11 open-market sales ($1.57M) across all tracked filings.
Haiping Dun is Director of ACM Research, Inc. (ACMR). 9 SEC Form 4 filings on record going back to 2024, most recently on 27 August 2026. Most recent open-market trade: sold $33K of ACMR on 20 August 2026. Lifetime open-market sales: $1.57M.
Recent transactions
17
The latest 17 SEC Form 4 transactions reported by Haiping Dun.
InsiderAlpha's records for Haiping Dun go back to 2024: 9 primary Form 4 filings, an average of 3.0 per year. 17 recorded transactions carry a Rule 10b5-1 plan flag. This identifies the marked transactions as reported under a trading plan; it does not establish the plan status of unmarked transactions.
