Twitter Gets Boost on News of Company Move to S&P 500

MarketWatch: Twitter shares rallied in the extended session Monday after S&P Dow Jones Indices announced the microblogging platform would join the S&P 500 index. Twitter shares rose 3.8% after hours, following a 3.4% rise to close at $37.88 in the regular session. Twitter shares are up 58% for the year, compared with a 2.7% rise in the S&P 500.