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

Worst Performers

10. ELAN: Elanco Animal Health (ELAN) dips 3.36% on Jefferies downgrade to hold from buy, alongside a lower price target.

9. PTEN: Patterson-UTI (PTEN) drops 3.49% on lower oil prices.

8. GE: GE Aerospace (GE) declines 3.67% as traders sold the news of strong Q3 earnings.

7. HWM: Howmet Aerospace (HWM) falls 3.82% on lack of fresh leads.

6. MPT: Medical Properties Trust (MPT) drops 3.86% on lack of catalysts to boost buying.

5. IREN: IREN Ltd. (IREN) down 4% on lingering concerns about borrowing for AI buildout.

4. FPS: Forgent Power Solutions (FPS) falls 4.09% after analyst downgrade.

3. GM: General Motors (GM) loses 6.84% on $20B buyback, lower growth outlook.

2. TSEM: Tower Semiconductor (TSEM) declines 8.25% on broader industry pessimism.

1. SE: Sea Ltd. (SE) loses 9.09% on broader market pessimism, chief commercial officer’s disposition of stake.

Top Performers

10. BB: BlackBerry Ltd. (BB) jumps 8.7% on strong QNX backlog.

9. RUN: Sunrun Inc. (RUN) climbs 9.87% on bargain-hunting after touching 52-week low in intraday trading.

8. NESR: National Energy Services Reunited (NESR) surges 11.12% on bargain-hunting.

7. HAS: Hasbro Inc. (HAS) climbs 11.2% on higher annual growth outlook after Q3 beat.

6. TLK: Telkom Indonesia (TLK) surges 11.39% on bargain-hunting.

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.”

2. LION: Lionsgate Studios (LION) surges 14.41% on revived talks to merge with Legendary Entertainment.

1. BRZE: Braze Inc. (BRZE) soars 51.7% on $5.66B merger with Salesforce.