Nasdaq futures turn lower; Nvidia falls over 1% premarket

The signal here is breadth, not depth: a single megacap chip name slipping premarket was enough to flip Nasdaq futures negative, which says the index's direction is leaning heavily on a narrow group of tech leaders. That concentration is what makes a modest move in one stock read as a broader sentiment cue. Whether futures hold that softness into the cash session, or reverse once regular trading absorbs the premarket move, is the open question worth watching.