The Dow Jones Industrial Average (DJINDICES: ^DJI) index edged 3.9% higher in May, with 70% of its 30 constituent stocks ending the month in positive territory. However, the two worst-performing Dow stocks in May -- both from the healthcare sector -- kept the index's rally in check, with one of them plunging over 25%.

It's a very competitive industry, but Verizon's large annual revenue and free cash flow provide plenty of resources to invest in technology and features to protect its competitive position. On that note,

The U.S. stock market ended sharply lower Friday, with all three major benchmarks under pressure as tensions in the Middle East ran high amid missile strikes between Israel and Iran. The Dow Jones Industrial Average dropped 769.

Markets rebounded after Trump said his administration intends to send letters to US trade partners to formally establish new tariff terms.

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Perhaps unsurprisingly, energy stocks were climbing on Friday, largely inspired by the huge jump in crude oil prices. Among the S&P 500's 11 sectors, energy stocks were the only ones in the green. The

The S&P 500 and Nasdaq composite index lost more than 1 percent. The Dow Jones Industrial Average decreased 1.8 percent, dragged down by three of its 30 stocks.