Unusual price movements and significant market activity for Charles River Laboratories International, Inc. (CRL). Each move is flagged by Z-score statistical significance — showing when CRL moved beyond its typical daily range. 4 significant moves detected in the last 30 days.
Current Market State
What May Be Driving CRL?
No specific catalyst has been identified in the available market data for Charles River Laboratories International, Inc. (CRL). The moves shown below are flagged based on statistical significance (Z-score ≥ 2), meaning CRL 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.
Charles River Laboratories International, Inc. operates in the Healthcare sector, specifically Services-Commercial Physical & Biological Research. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Aug 6, 2026 | Pre-market | $260.72 | +11.93% | 7.96 | — |
| Aug 5, 2026 | Pre-market | $253.00 | +8.06% | 5.38 | — |
| Aug 5, 2026 | Regular | $260.04 | +11.07% | 7.38 | — |
| Aug 5, 2026 | After-hours | $262.06 | +11.93% | 7.96 | — |
About CRL Market Moves
This page tracks unusual market activity for Charles River Laboratories International, Inc. (CRL) 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 CRL'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.