The Dow lost 572.25 points in the October 30 cash session. The S&P 500 lost 140.32. Yet Marketstack's end-of-day readings, carried by Bloomboff, put the S&P's percentage decline at 1.82%, against the Dow's 1.09%.⁠1

The reason is the starting level. The S&P fell from 7,720.39 to 7,580.07; the Dow from 52,342.56 to 51,770.31.⁠1 Divide each point loss by its own previous close and the apparently bigger Dow drop becomes the smaller percentage move.

These are provider-attributed readings for October 30 versus October 29, not live prices or independently exchange-confirmed figures. They compare two benchmarks, not every stock, and establish no cause for the falls.

Bloomboff's take

Big scary number, different ruler. Index points make a lousy scoreboard when the starting lines are miles apart.