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%.

Oil prices leapt, and stocks fell on worries that escalating violence following Israel's attack on Iranian nuclear and military targets could damage the flow of crude around the world, along with the global economy.

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,

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

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).

S&P 500 futures moved lower on Thursday evening ahead of a key jobs report that is expected to shed light on the health of the U.S. economy. S&P 500 futures ticked down 0.2%. Futures for the Dow Jones Industrial Average were little changed, while Nasdaq 100 futures shed 0.4%.

All three major U.S. stock indexes closed in positive year-to-date territory simultaneously for the first time since Feb. 21. The S&P 500, Nasdaq Composite, and Dow Jones Industrial Average all rose by 1%,

The S&P 500 slid 68 points, or 1.1%, to end the day at 5,977, while the Dow Jones Industrial Average dropped 749 points, or 1.8%, to 42,198 points. The Nasdaq Composite shed 1.3%.