Unusual price movements and significant market activity for KLA Corporation Common Stock (KLAC). Each move is flagged by Z-score statistical significance — showing when KLAC moved beyond its typical daily range. 7 significant moves detected in the last 30 days.
Current Market State
What May Be Driving KLAC?
No specific catalyst has been identified in the available market data for KLA Corporation Common Stock (KLAC). The moves shown below are flagged based on statistical significance (Z-score ≥ 2), meaning KLAC 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.
KLA Corporation Common Stock operates in the Technology sector, specifically Optical Instruments & Lenses. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Aug 18, 2026 | Pre-market | $195.80 | -4.84% | -3.23 | — |
| Aug 12, 2026 | Pre-market | $208.99 | +4.25% | 2.83 | — |
| Aug 7, 2026 | Pre-market | $200.49 | +3.76% | 2.51 | — |
| Aug 4, 2026 | Pre-market | $191.98 | +5.05% | 3.37 | — |
| Aug 4, 2026 | Regular | $195.97 | +7.23% | 4.82 | — |
| Aug 4, 2026 | After-hours | $194.98 | +6.69% | 4.46 | — |
| Aug 3, 2026 | Pre-market | $177.00 | -3.18% | -2.12 | — |
About KLAC Market Moves
This page tracks unusual market activity for KLA Corporation Common Stock (KLAC) 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 KLAC'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.