Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

ACM Research, Inc.

ACMR · Nasdaq · CIK 0001680062 · Technology · Semiconductor Equipment & Materials

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

47 Form 4 transaction lines observed in the same window
37 sales · 10 option, withholding, award, gift or other lines

Last qualifying purchaseNo qualifying purchase is present in the local Form 4 history.

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Wang David HSee Remarks
○▼○▼○▼○▼
Cheav SothearaSee remarks
○▼○▼
Dun HaipingDirector
○▼○▼
McKechnie MarkSee Remarks
○▼
● Purchase▼ Sale○ Other

—

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot.—

Recent Form 4 activity

0Purchases
72Sales
30Other Form 4 lines
18SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING37 sale line(s) · context only
OTHER10 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
+19.3%
3M
-15.4%
6M
+105.7%
12M
—

Volatility & liquidity

Volatility
86.9%
Beta
—
Avg daily value
—

Valuation

Market cap
—
P/E
—

Fundamentals

Profit margin
10.4%
ROE
6.4%
Industry
Semiconductor Equipment & Materials

Market data

Price data up to: 2026-10-04 · Price source: OpenBB/yfinance · From SEC filings: Profit margin, ROE · Fiscal year ended: 2025-12-31 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
4,055,665
Previous report
4,136,685
Avg daily volume
1,285,418
Days to cover
3.2

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

No qualifying code P equity purchase is present in the local Form 4 history.

Form 4 evidence

102 transaction lines in the latest 365-day window; 411 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-09Wang David HSale (S)Class A Common Stock70,000USD 74.59USD 5,221,492SEC filing ↗
2026-09-09Wang David HOption exercise / conversion (M)Class A Common Stock70,000USD 1.00USD 70,000SEC filing ↗
2026-09-08Wang David HSale (S)Class A Common Stock70,000USD 77.26USD 5,408,519SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-09Wang David HSale (S)Class A Common Stock70,000USD 74.59USD 5,221,492SEC filing ↗
2026-09-09Wang David HOption exercise / conversion (M)Class A Common Stock70,000USD 1.00USD 70,000SEC filing ↗
2026-09-08Wang David HSale (S)Class A Common Stock70,000USD 77.26USD 5,408,519SEC filing ↗
2026-09-08Wang David HOption exercise / conversion (M)Class A Common Stock70,000USD 1.00USD 70,000SEC filing ↗
2026-08-20McKechnie MarkSale (S)Class A Common Stock55,199USD 77.27USD 4,264,971SEC filing ↗
2026-08-20McKechnie MarkOption exercise / conversion (M)Class A Common Stock55,199USD 16.95USD 935,829SEC filing ↗
2026-08-18Dun HaipingSale (S)Class A Common Stock5,000USD 81.13USD 405,670SEC filing ↗
2026-08-18Dun HaipingOption exercise / conversion (M)Class A Common Stock5,000USD 5.60USD 28,000SEC filing ↗
2026-06-05Cheav SothearaSale (S)Class A Common Stock5,399USD 83.18USD 449,085SEC filing ↗
2026-06-05Cheav SothearaOption exercise / conversion (M)Class A Common Stock5,399USD 13.89USD 74,992SEC filing ↗
2026-06-04Wang David HSale (S)Class A Common Stock40,002USD 85.80USD 3,432,194SEC filing ↗
2026-06-04Wang David HOption exercise / conversion (M)Class A Common Stock40,002USD 1.00USD 40,002SEC filing ↗
2026-06-04Cheav SothearaSale (S)Class A Common Stock13,351USD 85.15USD 1,136,838SEC filing ↗
2026-06-04Cheav SothearaOption exercise / conversion (M)Class A Common Stock13,351USD 13.89USD 185,445SEC filing ↗
2026-06-03Wang David HSale (S)Class A Common Stock60,000USD 90.05USD 5,403,194SEC filing ↗
2026-06-03Wang David HOption exercise / conversion (M)Class A Common Stock60,000USD 1.00USD 60,000SEC filing ↗
2026-05-19Dun HaipingSale (S)Class A Common Stock5,000USD 66.22USD 331,111SEC filing ↗
2026-05-19Dun HaipingOption exercise / conversion (M)Class A Common Stock5,000USD 5.60USD 28,000SEC filing ↗
2026-04-17Pappis Charles CSale (S)Class A Common Stock5,000USD 52.00USD 260,000SEC filing ↗
2026-04-17Pappis Charles COption exercise / conversion (M)Class A Common Stock5,000USD 29.18USD 145,900SEC filing ↗
2026-03-12Wang David HSale (S)Class A Common Stock50,000USD 45.58USD 2,278,923SEC filing ↗
2026-03-12Wang David HOption exercise / conversion (M)Class A Common Stock50,000USD 1.00USD 50,000SEC filing ↗
2026-03-12McKechnie MarkSale (S)Class A Common Stock98,551USD 45.58USD 4,491,952SEC filing ↗
2026-03-12McKechnie MarkOption exercise / conversion (M)Class A Common Stock98,551USD 16.08USD 1,584,759SEC filing ↗
2026-03-11Wang David HSale (S)Class A Common Stock60,000USD 47.92USD 2,875,482SEC filing ↗
2026-03-11Wang David HOption exercise / conversion (M)Class A Common Stock60,000USD 1.00USD 60,000SEC filing ↗
2026-03-11Liu TracySale (S)Class A Common Stock15,000USD 47.91USD 718,636SEC filing ↗
2026-03-11Liu TracyOption exercise / conversion (M)Class A Common Stock15,000USD 1.00USD 15,000SEC filing ↗
2026-03-10Liu TracySale (S)Class A Common Stock45,000USD 47.38USD 2,132,146SEC filing ↗
2026-03-10Liu TracyOption exercise / conversion (M)Class A Common Stock45,000USD 1.00USD 45,000SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerACMR
CIK0001680062
SectorTechnology
IndustrySemiconductor Equipment & Materials Yahoo Finance
SEC SIC3559 Special Industry Machinery, NEC
ExchangeNasdaq

Data coverage

Local Form 4 history411 transaction lines from 2020-03-18 to 2026-09-09
0 P purchase lines · 252 S sale lines · 159 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.