CME Group rises as Citi upgrades to 'buy'

** Derivatives exchange operator CME Group's CME.O shares rise 1% to $267 premarket

** Citi upgrades CME to "buy" from "hold," citing catalysts ahead

** Brokerage sees a robust capital return over the next four months as it expects CME to return proceeds from OSSTRA sale to shareholders

** Adds CME's joint venture with FanDuel should help the firm expand its retail presence

** 6 of 18 brokerages rate the stock "buy" or higher, 9 "hold" and 3 "sell"; median PT $285 - data compiled by LSEG

** As of last close, CME stock up 14% YTD