KCG Holding Inc. shares slipped in the extended session Wednesday, walking back some of the last-minute gains in the regular session following a report that trading firm rival Virtu Financial Inc. offered to buy the company. KCG shares declined 3.6% to $16.30 after hours, after closing up 23% following a Dow Jones report that Virtu was offering more than $18 a share for the firm. Virtu shares declined 0.9% to $16.60 after hours.
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