First Solar is trading 4.21% down at $186.31, with the broad November 5 selloff the clearest current explanation for the decline. - Major U.S. indexes are sharply lower amid concerns about AI regulation and other macro risks. - First Solar closed at $194.51 on November 4. - Earlier reports linked solar optimism to Democrats’ congressional gains, and William Blair upgraded First Solar; those developments are supportive but do not clearly explain today’s decline.