IonQ (IONQ) Stock After Hours: Why Shares Fell on Dec. 15, 2025—and What to Watch Before the Market Opens Dec. 16
IonQ, Inc. (NYSE: IONQ) ended Monday’s session sharply lower and stayed soft in extended trading, as investors digested a cluster of insider Form 4 filings alongside fresh news highlighting intensifying global competition in quantum computing. Below is a clear, publication-ready breakdown of what happened after the bell on Monday, December 15, 2025, what’s driving the move, and what to keep on your radar before Tuesday’s open (December 16, 2025). IonQ stock price recap: big drop into the close, slight fade after hours IonQ shares closed Monday at $46.07, down $4.28 (-8.50%), after trading in a wide range with $51.00 as