Seagate (STX) Stock After Hours Today: What Happened After the Bell on Dec. 19, 2025 — and What to Watch Before the Next Market Open
Seagate Technology (STX) closed Friday at $296.36 and rose to $298.94 in after-hours trading, up 0.87%. The stock saw wide swings during the session, trading between $293.69 and $305.43, amid index rebalancing and options expiration. A Nasdaq-100 index change affecting STX is set to take effect before the market opens on Monday, Dec. 22, 2025.