On Thursday, Apple (AAPL.O) estimated that costs for the fiscal quarter ending in June would increase by about $900 million if global tariffs remain unchanged. Apple (AAPL.O) CEO Tim Cook said in an earnings call that Apple believes the impact of tariffs on the second fiscal quarter is "limited" as the company shifts its supply chain and inventory. "But for the quarter ending in June (third fiscal quarter), assuming that current global tariff rates, policies and implementation do not change for the remainder of the quarter and there are no new tariffs, we estimate the impact will increase our costs by $900 million," Cook said. In addition, Cook made it clear that the company is using U.S. suppliers. He expressed support for Apple's plan to spend $500 billion over four years, part of which will be used to expand teams and facilities in Arizona, Nevada, Iowa, Oregon, North Carolina and other places. "We expect to purchase more than 19 billion chips from more than a dozen states, including tens of thousands of advanced chips produced in Arizona this year," Cook said.