Unusual price movements and significant market activity for Arch Capital Group Ltd (ACGL). Each move is flagged by Z-score statistical significance — showing when ACGL moved beyond its typical daily range.
Current Market State
What May Be Driving ACGL?
No specific catalyst has been identified in the available market data for Arch Capital Group Ltd (ACGL). The moves shown below are flagged based on statistical significance (Z-score ≥ 2), meaning ACGL moved beyond its typical daily range. A catalyst may exist — such as earnings, analyst action, sector momentum, or news — but has not yet been tagged to this ticker.
Arch Capital Group Ltd operates in the Financial Services sector, specifically Fire, Marine & Casualty Insurance. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
No significant unusual moves detected for ACGL in the last 30 days. This ticker has been trading within its typical statistical range.
About ACGL Market Moves
This page tracks unusual market activity for Arch Capital Group Ltd (ACGL) across all trading sessions — pre-market (4:00 AM–9:30 AM ET), regular hours (9:30 AM–4:00 PM ET), and after-hours (4:00 PM–8:00 PM ET). A move is flagged as "unusual" when its Z-score reaches 2 or higher, meaning the price change is statistically significant relative to ACGL's recent daily volatility.
Z-score is calculated by comparing each move to the 20-day average return and standard deviation. A Z-score of 2.0 means the move is 2 standard deviations beyond the average — occurring in roughly the top 5% of daily moves. Relative volume (RVOL) compares current volume to the 20-day average volume at the same time of day, helping distinguish genuine institutional activity from noise.