First Solar (FSLR -21.7%) has lost nearly a fifth of its value since announcing this afternoon...

First Solar (FSLR -21.7%) has lost nearly a fifth of its value since announcing this afternoon CEO Rob Gillette is out. All in all, it's a stunning drop considering Gillette only joined the company in Oct. '09, and interim CEO Michael Ahearn ran the show for the prior 9 years. First Solar's news is adding to broader weakness in solar stocks (KWT -6.7%).