S&P 500 ekes out slight gain in May, extends monthly-win streak to three

The S&P 500 (SP500) on Wednesday managed to post a marginal gain of 0.25% for the month of May to close at 4,179.83 points, while its accompanying SPDR S&P 500 Trust ETF (NYSEARCA:SPY) added 0.34%.

The benchmark index traded in a tight range