Nexa Resources (NEXA) stock was down over 33% in recent Monday premarket activity, erasing Friday's gain.
UTime (WTO) shares fell 29%, reversing the previous session's rally.
Aether Holdings (ATHR) stock slipped more than 5% after the company said Friday it closed its initial public offering of 1.8 million shares at $4.30 apiece for $7.7 million in gross proceeds.
Comcast (CMCSA) shares slid 1% after Wells Fargo downgraded it to underweight from equalweight and lowered its price target to $31 from $37.