Short sellers are increasingly betting Twitter Inc.'s big rally isn't sustainable. As shares of the microblogging site have jumped 44% this month, short sellers have been piling in, betting that ...

Shares of Twitter (NYSE:TWTR) are down about 3% as both the S&P 500 and Nasdaq Composite fall more than 2.5% today. However, there’s another catalyst sending shares of TWTR stock lower. This morning, ...