Exicure (XCUR) shares surged 14% pre-bell Tuesday, extending Monday's rally.
RxSight (RXST) shares advanced 15% following a 5% drop in the previous session.
Okta (OKTA) shares increased 14%, a day after the company said it exceeded $1 billion in aggregate sales in the Amazon Web Services Marketplace.
Astrana Health (ASTH) shares rose 13%, adding to Monday's gains.
Sea (SE) shares were up 10% after the company reported it swung to Q4 earnings on higher revenue.