Lumentum Holdings (LITE) After-Hours Surge on December 9, 2025: AI Boom, Lofty Valuations, and What to Watch Before the December 10 Open
Lumentum Holdings closed at a record $360.33 on Dec. 9, 2025, up 5% after surging on AI data-center demand. Shares traded as high as $362.4 intraday and held gains after hours, rising to $362 at 6:30 p.m. ET. Volume topped 4.4 million, well above average. Analysts warn valuation appears stretched despite strong momentum.