all_time_high

All-Time High (Maximum value from inception)

`all_time_high(source)`

Parameters

Name	Type	Description
`source`	field, required	Field to track maximum value - typically high, close, or other price field

Formula

```
all_time_high(field) = MAX(field) from first trading day to current bar
```

Examples

all_time_high(high);  # Highest price ever reached
all_time_high(close);  # Highest closing price ever
close > all_time_high(high) * 0.95;  # Within 5% of all-time high
weekly_ath = mtf("1W") { all_time_high(high); };  # Weekly ATH for cross-timeframe analysis

Returns

The maximum value of the specified field from inception to current bar. ## Notes - Requires full price history for accurate calculation (infinite lookback) - Useful for identifying stocks near all-time highs - Commonly used with percentage thresholds (e.g., close > ATH * 0.95) - Works in MTF mtf() blocks for cross-timeframe analysis - Value increases monotonically (never decreases over time)

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