Chesapeake (CHK, news, chart, volatility) is up 96 cents to $18.23 and 40,000 CHK calls have traded on the day, compared to 14,000 puts. Today’s action comes amid renewed takeover chatter, with Exxon Mobile (XOM) mentioned as a possible suitor (per Briefing). Sentiment is decidedly mixed, however. January 17.5 and 20 calls are most actives. Almost 27,000 contracts (all in fewer than 900 ) but less than half traded ask-side.