Stock futures were falling Tuesday amid the latest tariffs uncertainty and as investors keyed on the start of the Federal Reserve's two-day meeting. On Monday, nine-session winning streaks ended for both the S&P 500 and Dow Jones Industrial Average.

These stocks were poised to make moves Tuesday:

Palantir Technologies Inc. was falling 7.9% in premarket trading. The data analytics company reported first-quarter adjusted earnings of 13 cents a share, in line with analysts' expectations, on revenue of $884 million that rose 39% from a year earlier and beat forecasts of $862 million. Palantir also raised its raised its full-year outlook. "We are delivering the operating system for the modern enterprise in the era of [artificial intelligence]," said CEO Alexander C. Karp. "Consequently, we are raising our full-year guidance for total revenue growth to 36% and our guidance for U.S. commercial revenue growth to 68%." Coming into the earnings report, Palantir shares had risen 65% in 2025.

Ford Motor was down 2.7% in premarket trading after the auto maker posted first-quarter earnings that beat analysts' estimates but suspended guidance for the full year because of uncertainty over President Donald Trump's tariffs on its business. The company expects tariffs to reduce adjusted pretax earnings by $1.5 billion.

Fellow auto makers also traded lower. General Motors was down 0.7% and Jeep maker Stellantis declined 1.7%. Electric-vehicle maker Tesla Motors fell 1.6% in premarket trading. It has declined 31% this year.

Class B shares of Warren Buffett's Berkshire Hathaway's were up 0.2% in premarket trading. Shares of the conglomerate fell 5.1% on Monday following Buffett's announcement over the weekend that he would be stepping down as CEO at the end of the year and after Berkshire's first-quarter earnings missed analysts' expectations. The drop Monday was Berkshire's worst post-earnings performance since Aug. 8, 2011, when it fell 6.5%, according to Dow Jones Market Data.

Vertex Pharmaceuticals posted first-quarter adjusted profit of $4.06 a share, below estimates of $4.32. Revenue of $2.77 billion also missed analysts' estimates of $2.85 billion. The stock fell 3.4%.

Clorox tumbled 3.5% after the cleaning-products maker reported fiscal third-quarter adjusted earnings that missed analysts' estimates as revenue fell 8% to $1.67 billion. The company also updated its fiscal-year guidance to "reflect recent changes in the macroeconomic and geopolitical environment" and the "impact of tariffs on earnings." Clorox said for fiscal 2025 it expects sales down 1% to flat, compared with a prior outlook of down 1% to up 2%.

Hims & Hers Health Inc. , the health and wellness company, reported first-quarter earnings that topped Wall Street estimates. But the company introduced long-term sales guidance that was lower than expectations and the stock fell 6% in premarket trading. For the second quarter, Hims & Hers expects revenue of between $530 million to $550 million, compared with expectations of $564.6 million.

Neurocrine Biosciences jumped 11%. First-quarter revenue at the biopharmaceutical company of $572.6 million beat estimates of $559.6 million. Sales of Ingrezza, a treatment for movement disorders, rose 8% from a year earlier to $545 million.

Upwork Inc. rose 11% after the platform for freelancers posted first-quarter earnings and revenue that topped Wall Street expectations.

Toy maker Mattel reported a narrower-than-expected first-quarter adjusted loss and sales that beat analysts' forecasts but paused its full-year outlook. "Given the volatile macroeconomic environment and evolving U.S. tariff landscape, it is difficult to predict consumer spending and Mattel's U.S. sales in the remainder of the year and holiday season." Mattel said it plans to raise prices in the U.S. "where necessary" on some toys.

Earnings reports are expected Tuesday from Advanced Micro Devices, Super Micro Computer, Rivian Automotive, Ferrari, Arista Networks, Marriott International, Upstart, Marathon Petroleum, Electronic Arts, and Datadog.

Advanced Micro Devices was down 0.6% ahead of the chip maker's first-quarter earnings report. The stock has declined 17% this year. Analysts expect AMD to post adjusted earnings of 94 cents a share on revenue of $7.1 billion.