Stock Market Movers: 10 Biggest Gainers and Losers – 19 October 2026

8. WDC: Western Digital (WDC) climbs 6.09% on bargain-hunting after a 5-day losing streak.

7. SMMT: Summit Therapeutics (SMMT) jumps 6.43% as it kicks off with Akeso Therapeutics the phase 2 study multiple treatment candidates, including combination of their therapies, in patients with the most common type of kidney cancer.

6. APLD: Applied Digital (APLD) surges 6.65% on bargain-hunting following last week’s fall to a new 52-week low.