https://www.cnbc.com/2018/06/04/twitter-to-replace-monsanto-in-sp-500.html

Twitter jumped as much as 5 percent in extended trading on Monday, after Dow Jones Indices announced the social media company would replace Monsanto in the S&P 500. Another tech giant, Netflix will fill the agricultural giant's place on the S&P 100.

The gains pushed Twitter stock above $39 a share after hours, extending earlier gains during the regular session that had pushed the company to a 52-week-high.