Tesla Motors Inc. (Nasdaq: TSLA) shares added 19.9% to $28.42, on volume of 5.2 million shares, or four times its full-day average, after Morgan Stanley upgraded the electric-car maker to overweight from equal weight.

Citigroup Inc. (NYSE: C) bought and sold 149.2 million shares Thursday, still pursuing a daily average of 490 million. C shares trailed Wednesday’s close by 1% to $4.41. C was at the center of the deal between Berkshire Hathaway and Lubrizol, making it a key figure in the story surrounding the departure of Buffett lieutenant David Sokol.

General Maritime Corp. (NYSE: GMR) shares fell 3.2% to $2.09, on volume of 7.4 million shares, triple its daily average, a day after the debt-riddled oil carrier shipper said Oaktree Capital Management would invest $200 million in the firm.