The S&P 500 index opened solidly higher on Tuesday morning, with the benchmark poised to extend its rally to a fifth straight day and putting it in position to reclaim its perch at a late-April record if its rally holds. The S&P 500 SPX, +0.58% most recently was up 0.7% at 2,907, but had hit an intraday high in early action at 2,913.05, placing the index about 1.1% short of its April 30 all-time closing high at 2,945.63, according to FactSet data. Gains for the S&P 500 have been supported over the month by a rally in informational technology shares and those for materials, which have climbed by at least 7% so far this month. Meanwhile, the Dow Jones Industrial Average DJIA, +0.42% and the Nasdaq Composite Index COMP, +0.81% also were advancing firmly on Tuesday, adding to their own multiday gains. Reports of coming economic stimulus for China, the second-largest economy, and expectations of easier monetary policy from the Federal Reserve, amid strife over international tariff tensions, has helped to support appetite for stocks recently.