EXHIBIT 99.1 News Release First Solar, Inc. Announces Third Quarter 2025 Financial Results and Updates Guidance TEMPE, Arizona, October 30, 2025 – First Solar, Inc. (Nasdaq: FSLR) (the "Company") today announced financial results for the third quarter ended September 30, 2025, and updated its 2025 guidance. Net sales for the third quarter were $1.6 billion, an increase of$0.5 billion from the prior quarter. The increase in net sales was primarily due to an increase in the volume of modules sold to third pa ...