Citi, Wells Fargo, Sunrun and more
Citigroup offices in New York City. Adam Jeffery | CNBC Check out the companies making headlines in midday trading.Pinterest — Shares of the image-sharing social media company surged 15% on a report from the Wall Street Journal that Elliott Management has acquired a more than 9% stake.Citigroup — Citigroup rallied 11% after second-quarter earnings beat on the top and bottom lines. Citigroup was the only one of the four major banks that reported earnings this week to surpass expectations on revenue.Wells Fargo — Shares of…