So far, so very good. Last year was a historic one for equity markets—with global stocks not recording a single down month and U.S. indexes hitting a record number of records—and while the new year is young, so far it seems to be extending 2017’s upward trend. Tuesday marks the 10th trading day of 2018, and market returns over that period stand to be the best in 15 years. The Dow Jones Industrial Average DJIA, -0.04% is up 4.3% over that 10-session period, while the S&P 500 SPX, -0.35% is up 3.9% and the Nasdaq Composite Index COMP, -0.51% has gained 4.6%. According to the WSJ Market Data Group, that represents the best 10-day start to a year for both the Dow and the S&P since 2003, when the Dow kicked off the year by rising 4.57% and the S&P rose 4.36%. For the Nasdaq, 2018 marks the best 10-day start since 2012, when it rose 4.72%.via