BUZZ-UK Oil Cos: Jefferies reshuffles ratings
** Jefferies updates ratings on oil cos, seeing value in the beaten-down sector ** Tullow Oil up 3.1 pct, second-largest large-cap gainer in Europe as Jefferies upgrades rating to "hold" ** Analysts upgrade stock, which is down 49 pct YTD, as it now trades near Jefferies' revised PT o
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