Statistical analysis
Support and Resistance: Meaning and Limits
Support and resistance summarize where price has recently traded; they are not guaranteed floors, ceilings or reversal signals.
Reviewed 1 September 2026How this site calculates the levels
On Share Market Open stock pages, support is the lowest observed low and resistance is the highest observed high across the recent 20-session window. The method is deliberately simple and transparent.
How to interpret them
A level describes historical price behavior, not hidden demand or supply. A price can pause, reverse or pass through the area without warning.
Why levels fail
Earnings, corporate actions, market gaps, news, liquidity changes and broad-market moves can make a recent range irrelevant. The lookback window also changes as old sessions leave the sample.
Use with context
Read the timestamp, volatility and data source. Do not convert a recent high or low into an automatic order or personalized trading recommendation.