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

Published October 19, 2026 at 6:47 pm EDT

Monday’s 10 Biggest Losers

10. MOS: The Mosaic Company (MOS) tumbles 4.89% as Q3 earnings loom.

9. TLK: Telkom Indonesia (TLK) dips 5.26% as MSCI warns of exclusion of Indonesia from its indices.

8. MPT: Medical Properties Trust (MPT) falls to 52-week low, ending 5.32% lower on lack of catalysts to boost buying.

7. RUN: Sunrun Inc. (RUN) sheds 5.62% on investor pessimism ahead of Q3 earnings.

6. FRVO: Fervo Energy (FRVO) drops 5.99% on lingering investor pessimism triggered by a short seller report claiming that it failed to disclose existential issues.

5. QXO: QXO Inc. (QXO) loses 6.63% on portfolio positioning ahead of Q3 earnings early in Nov.

4. ARR: ARMOUR Residential REIT Inc. (ARR) falls 6.97% on lack of fresh leads.

3. DJT: Trump Media & Technology (DJT) loses 8.01% ahead of Q3 earnings.

2. IBRX: ImmunityBio (IBRX) declines 8.28% on profit-taking on last week’s return to the $10 level.

1. ALM: Almonty Industries (ALM) declines 10.17% as investors resume selling positions amid Oppenheimer’s 24% price target cut.

Monday’s 10 Highest Gainers

10. CELH: Celsius Holdings (CELH) extends winning streak to 3rd day, up 5.43% on broader market optimism, portfolio positioning ahead of Q3 earnings.

9. SNDK: SanDisk Corp. (SNDK) up 5.53% on bargain-hunting after 7 straight days of declines.

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.

5. AXTI: AXT Inc. (AXTI) climbs 10.34% on bargain-hunting after a 3-day decline, while positioning ahead of Q3 earnings on Thursday next week.

4. ARQT: Arcutis Biotherapeutics (ARQT) jumps 10.65% as Guggenheim hikes price target by 16%, while maintaining buy reco.

3. CLF: Cleveland-Cliffs (CLF) ends 5-day losing streak with 16.34% surge on swing to Q3 profits, thanks to higher selling price, sales volume, and unit costs.

2. IRON: Disc Medicine (IRON) extends winning streak to 3rd day, soars 38.86% amid strong results from phase 3 trial of drug candidate Bitopertin in treating patients with Erythropoietic Protoporphyria (EPP).

1. SLN: Silence Therapeutics (SLN) soars 125.58% on Merck’s $1.3B acquisition offer, with each share to be acquired at a 130% premium over its closing price on Friday.

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Monday’s 10 Biggest Losers

Monday’s 10 Highest Gainers

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