The first half of 2017 is in the books, and the S&P 500 index and Nasdaq Composite each ended their first half of the year with the largest gains in several years. All told, the Dow was up 8 percent, the S&P 500 is up 8.2 percent, and the Nasdaq has risen by more than 14 percent.
The Nasdaq was the star performer of the first half, posting its largest first-half gains since 2009. That's nearly double the index's 7.5 percent increase for all of 2016.
And there may be even better times ahead. Since 1988 there have been 12 other times when the S&P 500 has seen a first-half gain of at least 6 percent. After each of those instances, the index has extended its increase through the second half — closing the year at a higher level than where it was at the end of June.