Walmart posted a strong first quarter and reiterated guidance for the year. However, executives warned that financial performance for the year ahead was subject to “substantial uncertainty” as a result of fluctuating tariff policies.

The company issued second-quarter guidance with net sales expected to increase 3.5 percent to 4.5 percent, but maintained its full-year guidance of net sales to increase between 3 percent and 4 percent from last year, and for adjusted earnings per share to range from $2.50 to $2.60.