Stock indexes look ready to hold or even build on Monday’s gains. Futures for the S&P 500 ― which has just completed its best three-month rally in six decades, pushing the index above its 200-day average ― are up almost 3 points in pre-session trading. Unlike the rest of the week, there’s little data to shift investor sentiment today, although at 10 am the Pending Home Sales Index for April could have some impact on sentiment. The PHSI looks at contracts that have been signed, but...