Check out the companies making headlines before the bell : Alibaba — The Chinese e-ecommerce giant saw shares rising more than 3% after The Wall Street Journal reported that the firm has created a more advanced chip as it looks to fill the gap left by Nvidia running into issues around selling its chips in China. Nvidia shares extended their recent losses, falling about 1% in the premarket. Caterpillar — The industrial giant’s shares lost nearly 3% in premarket trading after the company warned it could take a $1.5 billion to $1.8 billion hit this year due to tariffs. Dell Technologies — The tech stock slipped 5% after the company gave third-quarter earnings per share guidance that was below Wall Street’s expectations. Dell still beat on its top and bottom lines for the latest quarter, however. Ulta Beauty — The cosmetics and beauty products retailer surged about 4% after raising its full-year earnings and revenue forecast. Ulta expects full-year revenue of $12 billion to $12.1 billion, above the $11.7 billion estimate from analysts polled by LSEG. Ulta expects full-year earnings of $23.85 to $24.30 per share, while analysts were expecting $23.65. Affirm Holdings — The buy now, pay later fintech provider rallied 15% after fiscal fourth-quarter earnings and revenue beat analysts’ estimates. Affirm earned 20 cents per share on revenue of $876 million, while analysts polled by LSEG were looking for 11 cents in earnings per share on $837 million in revenue. Autodesk — Shares rallied 9.9% following a strong second-quarter earnings report. The software firm earned $2.62 per share, excluding items, on $1.76 billion in revenue, while analysts polled by LSEG penciled in $2.45 per share and $1.73 billion in revenue. Autodesk also posted upbeat guidance for the current quarter and full year. SentinelOne — The cybersecurity stock jumped 8% after posting second-quarter adjusted earnings of 4 cents per share, beating the 3 cents analysts polled by LSEG had penciled in. The company’s $242 million in revenue was in line with expectations. SentinelOne’s current-quarter revenue guidance was above LSEG’s consensus, and the company also raised its revenue guidance range for the fiscal year from previous estimates. Ambarella — Shares surged 18% after the fabless semiconductor design company lifted its outlook because of strong artificial intelligence demand, and reported a blowout second quarter. The company expects revenue of $379 million in fiscal 2026, topping the $350 million consensus estimate from LSEG. Dollar Tree — The discount retailer moved nearly 1% higher following an upgrade at Telsey Advisory Group to outperform from market perform. The firm believes Dollar Tree has a path toward multiyear growth now that it has sold Family Dollar. — CNBC’s Alex Harring, Michelle Fox, Sarah Min and Lisa Han contributed reporting.