Stock Market Movers: 10 Biggest Gainers and Losers – 20 October 2026

5. EQPT:  EquipmentShare.com Inc. (EQPT) soars 11.83% on higher growth outlook.

4. KVYO: Klaviyo Inc. (KVYO) rallies 11.93% on partnership with the Atlassian Williams F1 team, becoming the latter’s official B2C CRM partner beginning next year.

3. SLS: Sellas Life Sciences (SLS) soars 14.2% as investors cheer CEO Angelo Sergiou’s post marking the firm’s 15th Anniversary, while noting its step into the “next chapter with greater focus.”