and so is rdwr's trading volume. also, there is a 3 day holiday (starting today) in israel where alot of shareholders are located (including rdwr's workers). in a quiet pool like this, even little stones can make waves. but its only temporary.
I agree some light insider selling might be there... but I sure do suspect there are some shorts who just knew RDWR would come down after the run up from CBS. After all, they've been used to that since March.