An increasing number of major US companies are warning that tariffs will force them to raise prices

Get ready for higher price tags at the largest retailer in the US. Walmart imports more products than any other company in the country, according to the Journal of Commerce.

"Increased tariffs will lead to increased prices for our customers," Walmart chief financial officer Brett Biggs told reporters on Thursday after reporting its best first-quarter sales performance in nine years.

Macy's said more tariffs would likely force the department store giant to increase prices on a wide range of apparel and accessories categories, including both store labels and national brands.

"When you do the math, it's hard to find a path through that wouldn't impact customers," Macy's chief executive Jeff Gennette told investors on Wednesday.