First Solar stock last trades at USD 172.97 on September 28, 2026

First Solar stock last traded at USD 172.97 on September 28, 2026, down 2.67 percent. The company plans to withdraw its USITC complaint and continue TOPCon patent lawsuits in federal court.

First Solar, Inc. (Nasdaq: FSLR) last traded at USD 172.97 on September 28, 2026, down 2.67 percent from the previous close. The quote was timestamped 8:00:01 PM UTC.

Trading session

First Solar’s regular-session price was reported in U.S. dollars on Nasdaq. The stock’s daily change was separate from the company’s previously announced intellectual-property actions.

Patent strategy shifts to federal court

On September 15, 2026, Business Wire reported that First Solar intended to voluntarily withdraw its Section 337 complaint and seek termination of the investigation pending before the U.S. International Trade Commission without prejudice to refiling later.

The company said it would continue pursuing existing TOPCon patent lawsuits in U.S. District Court, including cases against affiliates of Canadian Solar, Jinko Solar, T1 Energy and Trina Solar. First Solar also said it intended to resume efforts to enforce its global TOPCon patent portfolio against other manufacturers it believes infringe those patents.

First Solar said the strategy change followed the U.S. administration’s Section 232 action concerning imports of polysilicon and its derivatives. The company obtained its U.S. TOPCon patents and related international patents through its 2013 acquisition of TetraSun, Inc.