US equity markets saw sharp stock-specific movements on Monday, December 15, with select small-cap and technology names posting outsized gains and steep declines.
AMC Robotics Corporation (AMCI) emerged as the top gainer, rallying 168.27%, followed by Radiopharm Theranostics (RADX), which surged 149.53%. Artiva Biotherapeutics (ARTV) also recorded strong momentum, rising 90.91% during the session.
On the downside, iRobot Corporation (IRBT) led the losers, plunging 72.69%, marking one of its sharpest single-day declines. CCH Holdings (CCHH) fell 61.51%, while Luminar Technologies (LAZR) slid 60.82%, reflecting heavy selling pressure across select technology and mobility stocks.
Other notable decliners included Momentus Inc. (MNTSW), down 55.44%, and Greenfire Resources (GFR), which dropped 52.8%.
The session underscored heightened volatility in smaller and emerging companies, as investors reacted to company-specific developments and broader risk sentiment.
