Call volume for $35 July calls

Check out the volume on the July calls for VRTX (28.51)

$30 strike price trader 1995 calls.
$35 Strike price traded 5285 calls. - Some one bet $26,000 that VRTX price will go higher than $35 before EOD July 20th.

I checked almost all the other expiry dates for the $35 strike price and the volume is high only on July. This means it's not like someone is moving the calls to a later date. A sure way to tell is if the Open Interest in the $35 strike price goes up to about 14700 tomorrow.