NEW YORK ( TheStreet) -- CHANGE IN RATINGS Davita ( DVA) was downgraded at Goldman Sachs to sell from neutral. $110 price target. Company faces earnings headwinds, Goldman Sachs said. Gogo ( GOGO) was initiated with an outperform rating at William Blair. Company is a market leader and can deliver solid growth, William Blair said. Medley Capital ( MCC) was upgraded to buy at TheStreet Ratings. PPL) was initiated with an equal-weight rating at Morgan Stanley. $32 price target. Company is transitioning to a regulated utility, but consensus expectations appear too high, Morgan Stanley said. Scholastic ( SCHL) was upgraded to buy at TheStreet Ratings. Tenneco ( TEN) was upgraded at Goldman Sachs to buy from neutral. Company has strong secular drivers and margin prospects, Goldman said.