RIG options

hey guys I know I'm new to options trading....but I was going through my list of stocks I like to trade and noticed RIG.....the odd thing was (to me anyway) the underlying was at 155 and the 140 calls were trading at 4.6.....what am I missing?
 
There are two series of MAY calls indicating a possible adjustment or other event. I would go to the OCC website and look up RIG and look for news about adjusted options.

The regular MAY 140 calls are trading at 17.30.
 
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