Stocks making the biggest moves after hours: ON Semiconductor, Upwork, Chegg and more (2026)

The stock market is a thrilling arena where fortunes can be made or lost in an instant, and the after-hours trading session is no exception. Imagine a late-night auction, where the bidding continues even after the official closing bell. But which companies are making the most significant moves in this extended trading period?

CNBC brings you the inside scoop on the stocks that are stirring up excitement after the regular trading day. This exclusive list includes ON Semiconductor, a technology company that's been making waves; Upwork, a platform connecting businesses and freelancers; and Chegg, a popular education technology company. These companies are just the tip of the iceberg, as the list also features other intriguing names.

But here's where it gets controversial: what drives these after-hours surges? Is it late-breaking news, earnings reports, or perhaps insider trading? The reasons can be as diverse as the market itself. For instance, a company might release positive earnings after the market closes, causing its stock to surge in after-hours trading. Or, a significant news event could impact a specific industry, leading to unexpected stock movements.

Stay tuned to CNBC for more insights and updates on these post-market movers. And remember, the stock market is a dynamic, ever-changing landscape, full of surprises and opportunities. Are these after-hours moves a sign of things to come, or just a temporary blip? Share your thoughts and predictions in the comments below. Let's discuss the potential implications and strategies for investors navigating these extended trading hours.

Stocks making the biggest moves after hours: ON Semiconductor, Upwork, Chegg and more (2026)

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