US stock index futures extend rebound; Dow futures turn positive after falling nearly 1%

The signal here is the speed of the reversal rather than the size of the move: futures swung from a near-1% Dow decline back to positive without any disclosed catalyst, which points to positioning and sentiment driving price action rather than fresh information. That matters most for traders watching index-level direction as a read on risk appetite, since an unexplained round trip offers little to anchor a view on. Whether the recovery holds once cash markets take over, and whether any catalyst later explains the swing, is the open question.