You are right. Didn't knew about the stock just being added to the Nasdaq 100. That's a huge catalyst to propel the stock higher indeed. On the other hand - many would look at the stock and see it's gone parabolic.... they probably say " i'll wait for a lower high to buy the dip." These parabolic moves normally retrace a fib 50, so If it's continue to go for the 140 level that could be the chance for the first buyers to get out - shorting it and wait for the 70 level to go long again.