Upstart Stock News Today: UPST Jumps on Tech CU Partnership as Wall Street Weighs 2026 Outlook (Dec. 18, 2025)
Upstart Holdings, Inc. (NASDAQ: UPST) is back in the spotlight on December 18, 2025 (18.12.2025), with the AI-lending stock pushing higher as traders react to fresh partner momentum in credit unions—and try to square that optimism with a still-volatile macro