Walmart, CVS, American Express, Apple, Johnson & Johnson, Rio Tinto and Tribune Publishing

Here are the companies that the Yahoo Finance team is watching today.

A new agreement between Walmart and CVS. The retail giant signed a multi-year contract with CVS's pharmaceutical benefits program, Caremark. It occurs days after CVS said that Walmart was leaving its network, in a price dispute. Walmart is one of the largest pharmacy operators in the country.

American Express is under pressure this morning after falling short of its latest earnings. Profits came in below expectations as expenses increased. That was driven in part by competition that raised costs. American Express has had to offer higher rewards to customers to keep using their cards.

Apple is partnering with a pharmaceutical giant to see if its newer clocks can detect heart problems. He is working with Johnson and Johnson to study a cardiac monitoring application on the Apple Watch. The application developed by J & J can help detect irregular heart rhythms and the study will be launched later this year.

Rio Tinto expects a new increase in exports in the next year. The miner said it sent more iron ore from its Australian mining operations in 2018 than the previous year, about 2% more. This comes after he increased the production of his newest mine and worked others even more.

Tribune Publishing has a new CEO. The publishing company named the executive of the Chicago newspaper Tim Knight CEO on Thursday, effective immediately. This comes after former president and president Justin Dearborn resigned after nearly three years in charge. The company also announced the departure of other top executives.

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