Why Stocks Moved Today: Novavax Jumps 16%, Plus 10 More Big Movers

These were the biggest moves of Monday, October 12 among U.S. stocks trading at least 300,000 shares, each matched with the news that broke around the move.

Biggest gainers

• Novavax (NVAX) +15.8% to $12.75. In the headlines: BofA Adjusts Price Target on Novavax to $8 From $7, Keeps Underperform Rating (MT Newswires)
• Crown Castle (CCI) +15.6% to $79.64. In the headlines: Crown Castle (CCI) Surges 15.6%: Is This an Indication of Further Gains? (Zacks)
• Service Properties Trust Common (SVC) +15.0% to $7.15. In the headlines: Service Properties (SVC) Surges 15.0%: Is This an Indication of Further Gains? (Zacks)
• Moderna (MRNA) +14.2% to $225.00. In the headlines: Moderna stock surges more than 600% in 2026 (Quartz)
• Humana (HUM) +11.6% to $431.87. In the headlines: Why Did MRNA, HUM, LITE Stocks Surge To 52-Week Highs Last Week? (Stocktwits)
• Prime Medicine (PRME) +11.5% to $3.99. In the headlines: Prime Medicine Stock Rallies Nearly 26% in a Month: Here's Why (Zacks)

Biggest decliners

• Alignment Healthcare (ALHC) -13.4% to $7.54. In the headlines: Alignment Health Launches New Medicare Advantage Plan Designed for Asian American Seniors in Los Angeles and Orange Counties (GlobeNewswire)
• T-Mobile US (TMUS) -13.3% to $148.58. In the headlines: T-Mobile Rebounds 3% After Record Drop on Starlink Spectrum Move; SpaceX Ticks Up, Verizon Edges Higher (24/7 Wall St.)
• Park Aerospace (PKE) -11.1% to $26.38. In the headlines: Park Aerospace (PKE) Q2 2027 Earnings Call Transcript (Motley Fool)
• AT&T (T) -10.8% to $22.18. In the headlines: T-Mobile Rebounds 3% After Record Drop on Starlink Spectrum Move; SpaceX Ticks Up, Verizon Edges Higher (24/7 Wall St.)
• AST SpaceMobile (ASTS) -10.5% to $50.97. In the headlines: AST SpaceMobile Rallies 4% as Next BlueBird Satellites Reach Cape Canaveral; Rocket Lab and Intuitive Machines Hold Flat (24/7 Wall St.)

Moves from Nasdaq end-of-day data; headlines from GTA's news feeds. A headline near a move doesn't prove it caused it.

Written by the GTA Research Desk from GTA Terminal data. Not investment advice.