price (2.50) and time of trade early this week of over 800 July 12.5 calls clearly appeared to be a sell. prices (implied volatility) of options remain very high... maybe too attractive to a seller who wanted some insurance around a short term (?) market top.
most common would be a market maker who would then sell shares to maintain a neutral position. I suppose also that Russell index maneuvering might be a complicating factor in the mix. in any event, the high prices of options reflect an expectation of strong price movement over the next few months.