Check out the companies making headlines before the bell. Stocks moving on tariffs — U.S. stocks reacted to the new 25% tariffs President Donald Trump levied on Saturday on goods from Canada and Mexico, and 10% on China, effective at midnight Monday. Stocks suffering the most included automakers and suppliers, consumer goods makers, clothing companies, steelmakers, railroads, transportation providers, nuclear stocks on Canadian uranium exposure, restraurant chains on higher food costs, homebuilders and solar stocks. General Motors — -8% Ford — -5% Tesla — -3% Aptiv — -5% Cummins — -3% Constellation Brands — -6% Diageo — -4% Chipotle Mexican Grill — -3% Nike — -2% Lululemon Athletica — -3% Nucor — +2% Steel Dynamics — +2% Apple — -2% Canadian Pacific Kansas City — -6% Canadian National Railway — -4% FedEx — -2% GE Vernova — -5% Constellation Energy — -4% Toll Brothers — -2% Broadcom — -4% Sunrun — -4% PDD — -6% Tyson Foods — The maker of Jimmy Dean sausage rose nearly 4% after fiscal first quarter results topped expectations. Tyson reported earnings of $1.14 per share, above the 90 cents per share estimated by analysts, according to FactSet. Sales rose about 2.3% year over year, led by growth in the beef category. IDEXX Laboratories — The veterinary healthcare stock added 4% after fourth-quarter revenue of $954.3 million topped analyst estimates of $935.1 million, according to FactSet. PVH — Shares of the Calvin Klein and Tommy Bahama parent slipped 3%. Wells Fargo downgraded the apparel maker to equal weight from overweight Monday, saying it feels like a value trap due to mounting issues. Becton, Dickinson and Co. — Shares rose 2.4% after the Financial Times, citing people familiar, reported Starboard Value took a stake in the medical device company, seeking a spinoff of the life sciences business, according to FactSet. — CNBC’s Michelle Fox, Jesse Pound and Sarah Min contributed reporting.