Saying last week’s sell-off triggered by one bank’s results appears to be overblown, Citi analyst Keith Horowitz on Monday upgraded Citizens Financial Group Inc. to buy from hold.Citizens Financial Group’s stock CFG, +2.82% rose by 1.4% in premarket trading.“With the market pricing in greater credit concerns, we are stepping off the sidelines and upgrading CFG,” Horowitz said. Horowitz kept his target price for the stock at $36 a share, after Citizens Financial Group’s stock dropped by 7% between Jan. 30 an ...