Coverage & methodology
Qualifying days use split-adjusted daily bars built from one-minute bars, 04:00–20:00 ET, so pre-market and after-hours trading count. A day qualifies when its high is at least 20% above OR its low is at least 10% below the previous close, and volume is at least 1 million shares and at least 3× the prior 20-session average. The close is the last regular-session minute. Today is excluded. Consecutive trading sessions are grouped into one episode.
Coverage reflects collected evidence. Missing sessions remain unknown rather than being counted as no activity. One-minute charts show observed candles only, including extended-hours data where available.
