Western Digital Stock (WDC) After Hours Today, Dec. 19, 2025: Nasdaq-100 Inclusion Looms—What to Know Before the Next Market Open
Western Digital Corporation (NASDAQ: WDC) ended Friday’s session (19.12.2025) with momentum—and then kept drifting higher after the closing bell as traders positioned for a major technical catalyst: the company’s pending addition to the Nasdaq-100 Index, effective before the market opens on Monday, Dec. 22, 2025. StockAnalysis+2Nasdaq+2 Here’s what happened in the regular session, what the after-hours tape is signaling tonight, and what investors should keep in mind heading into the next opening bell (note: U.S. markets are closed Saturday and Sunday). WDC stock price check: how Western Digital traded into and after the bell Regular session (Friday close): After-hours (early