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%.

The blue-chip Dow Jones Industrial Average was headed for its worst daily drop in almost a month on Friday as the Israel-Iran conflict rattles investors, after easing back from session lows. The Dow was down about 774 points,

US stocks fell on Friday after Israel's attack on Iran and Iran's retaliation shook global markets, pushing oil prices to their highest level since January. The major averages sank to a session low in the afternoon after Israeli defense forces said dozens of Iranian missiles were launched at Israel and "all of Israel is under fire.

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

The major averages posted modest gains on Thursday, placing them on track for a winning week. Softer-than-anticipated inflation reports helped lift stocks.

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,

Stock futures fell sharply early Thursday, pointing to a rocky open as Wall Street grapples with a tragic plane crash involving Dow component Boeing (BA) and digests a blockbuster earnings report from software giant Oracle (ORCL).

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.