Procept BioRobotics (PRCT) shares were down 24% in recent Thursday premarket activity, a day after the company posted a wider Q4 net loss and BofA Securities downgraded the company's stock to underperform from neutral.

The Trade Desk (TTD) stock was down 17%, a day after the company issued lower-than-expected Q1 revenue guidance.

Vir Biotechnology (VIR) shares were 16% lower after the company said overnight it priced an underwritten offering of about 17.6 million of its common shares for expected gross proceeds of $150 million.

Larimar Therapeutics (LRMR) stock was down 11%, a day after the company said it priced an upsized public offering of 20 million common shares at $5 each to raise $100 million.