Check out the companies making headlines before the bell rings. Humana: Shares plunged more than 22% after the healthcare company announced preliminary Medicare Advantage data for 2025. The company said in an 8-K filing that 25% of its members are currently enrolled in qualified plans with 4 stars or more for next year. which is down 94% in 2024. Nike: Shares sank 7% after the sportswear and sneaker company withdrew its full-year guidance. Nike, which posted higher profits and lower revenue in its fiscal first quarter, also postponed its investor day as its new chief executive prepares to take over. China Stocks: Shares of Chinese companies continued to gain amid the broader stimulus rally. E-commerce company JD.com and electric vehicle maker Li Auto advanced more than 9%, while technology company Baidu and Temu parent PDD advanced more than 6%. E-commerce company Alibaba also rose more than 4%. Lamb Weston – Shares of the French potato chip maker fell 5% after the company warned in its fiscal first quarter that demand appears weak for restaurants and frozen products. Lamb Weston's adjusted earnings for the period were slightly better than expected: 73 cents per share. Analysts surveyed by LSEG were looking for 72 cents per share. Diamondback Energy: Oil stocks rose 3% after an upgrade to overweight from equal weight at Barclays. Analyst Betty Jiang said Diamondback had one of the “clearest positive event paths,” referencing the company's $26 billion merger deal with Endeavor Energy Resources. LPL Financial – Shares fell 3.4% after LPL Financial fired CEO Dan Arnold for allegedly violating its “commitment to a respectful workplace.” The firm said Rich Steinmeier, chief growth officer, will take over as interim CEO. Harley-Davidson: Shares of the motorcycle maker fell 4% after receiving a downgrade to neutral from buy at Baird. The firm cited risks to its third-quarter guidance, including both a weak retail outlook and excess inventory. Energy Stocks: Shares of energy companies rose following Iran's missile attack on Israel. APA Corp and Marathon Oil rose more than 2% and Occidental Petroleum rose more than 1%. — CNBC's Lisa Kailai Han, Jesse Pound, Sarah Min and Michelle Fox Theobald contributed reporting.