Twitter's big improvements are 'already priced in' (TWTR)

Twitter shares may be topping out, according to Macquarie analyst Ben Schachter. 
The stock has soared this year, and all of Twitter's strategy and product improvements are priced in, he says. 
Plus, there isn't a new catalyst that will drive further gains for the moment. 
Watch Twitter trade in real time here. 
Twitter has quietly been one of the best performing US stocks this year. It's up more than 80% this year, but has flown under the radar because of the big gains from