First Solar's stock experienced a significant after-hours plunge of 10.92% following the release of its fourth-quarter financial results.

The solar technology company reported quarterly earnings of $4.84 per share, which missed the analyst consensus estimate of $5.14. While quarterly sales of $1.683 billion exceeded expectations of $1.563 billion, the company's forward guidance disappointed investors.

First Solar forecast 2026 net sales in the range of $4.9 billion to $5.2 billion, substantially below the $6.12 billion analyst estimate. This weak revenue outlook for the coming year triggered the post-market selloff as investors reassessed the company's growth prospects.