Sunrun Inc (NASDAQ:RUN) stock is down 1.9% before the bell, extending Tuesday’s historic rout in the solar sector. RUN's slide follows an RBC Capital Markets downgrade to “sector perform” from “outperform,” alongside a drastic price-target cut to $5 from$12, as analysts note mounting pressure across the alternative energy space.RUN plunged 40% yesterday — its worst single-session drop on record. The shares hit their lowest level since 2018 last session before paring losses, and are eyeing those levels once ...