S&P 500

• Volatility10.8%

  31st percentile of the last 232 readings — below typical. Annualised from the last twenty sessions, then ranked against the same calculation on every twenty-session window of the past year.

• Latest session+0.51%

  51st percentile of the last 251 readings — typical. Ranked on size and not direction, so an unusually large fall reads as unusual rather than as a low return.

• Five sessions+1.22%

  73rd percentile of the last 247 readings — above typical. Ranked among every five-session change of the past year, direction included.

• Twenty sessions+0.16%

  38th percentile of the last 232 readings — below typical. Ranked among every twenty-session change of the past year, direction included.

A percentile is the share of the past year’s readings at or below the current one. The multi-session rows keep direction, so a high rank there means a strong rise; volatility and the latest session are ranked on size alone, so a high rank means a large move either way. All of it describes how ordinary today is by this instrument’s own standards, which is a statement about the record and not about what happens next.