Western Digital (WDC) Stock After Hours Today (Dec. 22, 2025): Post-Close Update, Nasdaq-100 Impact, and What to Watch Before Tuesday’s Open
Western Digital closed Monday at $176.76, down 2.39%, then edged up 0.21% to $177.13 in after-hours trading. The stock swung between $171.91 and $187.24 on heavy volume as it debuted in the Nasdaq-100 index. Broader U.S. markets rose on light pre-holiday trading. Index rebalancing and thin liquidity drove volatility.