According to tax returns released by Mr. Bush’s campaign on Tuesday, he sold $1,103,424 worth of stock in Tenet Healthcare in September and October of 2013, yielding a capital gain of $556,283. It hadn’t taken Mr. Bush long to double his money — he was selling shares he had acquired in 2010 and 2011.[...]

Mr. Bush served as a director of Tenet from 2007 to 2014, and like other directors, he was required as a condition of his employment to hold a significant investment in Tenet.

Mr. Bush’s tax returns reflect a gain of 105 percent on Tenet stock he acquired in May 2011 and sold in October 2013. Tenet shares actually gained 68 percent over that period; Mr. Bush’s higher gain may be related to his receipt of restricted stock grants. Still, Tenet’s 68 percent gain was much stronger than the 26 percent overall gain for the S.&P. 500 index over the same period.