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,

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

The Dow Jones Industrial Average, often called the Dow Jones or just the Dow, is a stock market index that tracks 30 major publicly traded companies in the United States.

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.

With a market cap of $43.5 billion, Diamondback Energy, Inc. (FANG) is an independent oil and natural gas company. Based in Midland, Texas, the company focuses on the acquisition, development, exploration,