Glucose monitoring device maker DexCom stock rallies more than 50% in October to pace the S&P 500 - MarketWatch

keep them connected way to beryllium the S&P 500's SPX, -0.49% champion October performer with a month-to-date summation of 50.6%. The rally comes arsenic shaper of glucose monitoring systems reported past week third-quarter results that bushed expectations and got a boost from the Centers for Medicare and Medicaid Services' issuing a proposal that would grow the sum of glucose monitoring devices. Just down DexCom connected the S&P 500's October best-performers database was cruise relation Norwegian Cruise Line Holdings Ltd.'s shares NCLH, +2.51% with a 49.7% rally this month, followed by lipid services institution Halliburton Co.'s banal HAL, +0.17% with a 47.4% gain. Year to date, the S&P 500's champion performer has been lipid and state shaper Occidental Petroleum Corp.'s banal OXY, +1.74% by a wide margin, arsenic it has rocketed 154.6% this twelvemonth portion chap vigor institution Hess Corp.'s banal HES, +1.34% was 2nd with a 92.9% advance.