Check out the companies making the biggest moves in premarket trading: Paccar — The maker of Peterbilt trucks jumped 7% after President Donald Trump slapped a 25% tariff on imported heavy trucks starting Oct. 1. Intel — The chip company added 4.4%. The Wall Street Journal reported Intel has approached Apple , Taiwan Semiconductor and others about investing in the beleaguered company. Furniture stocks — President Trump said he is imposing a 30% tariff on upholstered furniture, effective Oct. 1, sending shares of furniture retailers lower. RH tumbled nearly 4%, while Wayfair and Williams-Sonoma both fell about 3%. Semiconductor companies — Shares of chipmakers slipped after a repor t that Trump is considering imposing tariffs on semiconductor companies that don't maintain a 1:1 ratio of domestically manufactured to imported semiconductors. STMicroelectronics fell about 2%, while Marvell Technology , Taiwan Semi and Teradyne dipped about 1%. U.S. pharmaceutical stocks — Trump announced a 100% tariff on branded, patented drugs entering the U.S., exempting companies building manufacturing plants in the U.S. Eli Lilly , Abbvie and Merck all gained 1.5%, while Amgen was ahead almost 1%. U.S.-listed shares of Novo Nordisk slipped about 1%. Concentrix — The technology and services company plunged 20% after third-quarter earnings disappointed investors. Adjusted earnings came in at $2.78 per share, less than a consensus estimate of $2.87 per share as compiled by LSEG. Six Flags Entertainment — The amusement park company rose 3.3%. Shareholder Land & Buildings sent a public letter to stakeholders outlining how the company can create value by monetizing its real estate holdings, including spinning off real estate into an investment trust. Kenvue — Shares of the Tylenol-maker gained 1.4% on the back of an upgrade at Rothschild & Co, which said there is a clear path to value creation following the stock's pullback. Kenvue has tumbled more than 20% this month since reports the Trump administration would link Tylenol use by pregnant mothers to autism, Rothschild said. The administration made that unproven link on Monday. Warner Bros Discovery — The HBO Max owner shed 1% following a downgrade at KeyBanc. The firm believes the stock's valuation has gotten ahead of its fundamentals. Riot Platforms — The bitcoin miner was upgraded at Citigroup to buy/high risk from neutral, sending the stock 4.6% higher after having fallen 4.1% the first four days of the week. Costco Wholesale — Shares dipped 1% after fiscal fourth-quarter earnings and revenue topped Wall Street estimates. The warehouse retailer posted earnings of $5.87 per share on revenue of $86.16 billion, above consensus estimates for $5.80 per share on revenue of $86.06 billion, based on analysts surveyed by LSEG. Costco reported double digit gains in both membership income and e-commerce business. Costco shares have lagged the market in 2025, rising less than 3%. —CNBC's Alex Harring and Sarah Min contributed reporting. (Learn the best 2026 strategies from inside the NYSE with Josh Brown and others at CNBC PRO Live. Tickets and info here .)
