Comstock Holdings (CHCI) shares were down 37% pre-bell Thursday after a 4.4% increase in the previous session.
Concrete Pumping (BBCP) stock was 30% lower, adding to Wednesday's 4.1% loss.
The Trade Desk (TTD) shares were down 29%, a day after the company posted Q4 revenue that trailed analysts' estimates.
Fastly (FSLY) stock was 22% lower after the company reported late Wednesday it swung to a Q4 loss.
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