Unusual price movements and significant market activity for Rio Tinto plc (RIO). Each move is flagged by Z-score statistical significance — showing when RIO moved beyond its typical daily range. 4 significant moves detected in the last 30 days.
Current Market State
What May Be Driving RIO?
No specific catalyst has been identified in the available market data for Rio Tinto plc (RIO). The moves shown below are flagged based on statistical significance (Z-score ≥ 2), meaning RIO 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.
Rio Tinto plc operates in the Basic Materials sector. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Aug 5, 2026 | After-hours | $102.38 | +3.40% | 2.27 | — |
| Aug 4, 2026 | Pre-market | $99.14 | +3.38% | 2.25 | — |
| Aug 4, 2026 | Regular | $99.19 | +3.43% | 2.29 | — |
| Aug 4, 2026 | After-hours | $98.92 | +3.15% | 2.10 | — |
About RIO Market Moves
This page tracks unusual market activity for Rio Tinto plc (RIO) 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 RIO'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.