Stocks making the biggest moves midday: Zillow, KLA, iRobot, Immunome & more

CNBC
Original Story by CNBC
December 15, 2025
Stocks making the biggest moves midday: Zillow, KLA, iRobot, Immunome & more

Midday trading saw significant movements in stocks such as Zillow, KLA, iRobot, and Immunome, reflecting a mix of investor sentiment and market dynamics. Key factors influencing these changes include earnings reports and broader economic indicators, which have created a volatile trading environment. The shifting landscape has implications for investor strategies, as traders reassess risk and opportunity in light of these developments. Looking ahead, market participants will be closely monitoring upcoming financial disclosures and economic data releases that could further impact stock performance.

Dive Deeper:

  • Zillow experienced notable fluctuations due to recent earnings that exceeded analyst expectations, driving investor interest.

  • KLA reported a decrease in revenue forecasts, which spurred a decline in its stock price amidst concerns over semiconductor demand.

  • iRobot's stock rose sharply after announcing a partnership aimed at enhancing its product offerings, signaling growth potential.

  • Immunome's stock saw significant gains following positive clinical trial results, indicating advancements in its therapeutic pipeline.

  • Market analysts are focusing on upcoming Federal Reserve meetings and economic data releases that could influence stock market trends.

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