Here are some of the stocks making the biggest moves in extended trading. Qualcomm — Shares of the chipmaker tanked more than 8% as a global memory shortage hurt its forecast. Qualcomm expects fiscal second-quarter adjusted earnings of between $2.45 and $2.65 per share on revenue of $10.2 billion to $11 billion. Analysts polled by LSEG were expecting $11.11 billion in sales and earnings of $2.89 per share. Alphabet — The Google parent added about 1%. Alphabet beat on both its earnings and revenue for the fourth quarter. Other metrics that Wall Street was watching such as Google Cloud revenue and traffic acquisition costs also came in above expectations. Elsewhere, YouTube advertising came in at $11.38 billion in the fourth quarter, while analysts had expected $11.84 billion, according to StreetAccount. The company also anticipates a sharp increase in spending on artificial intelligence in 2026. Boot Barn — The American retail chain specializing in Western wear jumped 5% after lifting its full-year guidance for earnings to $7.25 to $7.35 per share, versus its earlier call for $6.75 to $7.15 per share. This compares to the FactSet consensus for $7.31 per share. Fiscal third-quarter earnings of $2.79 per share and revenue of $705.6 million were in line with the company’s prior guidance. Align Technology — The maker of Invisalign jumped more than 11% after posting fourth-quarter results that beat on the top and bottom lines. Align Technology reported earnings of $3.29 per share on an adjusted basis, more than the LSEG consensus estimate of $2.97. Revenue of $1.05 billion exceeded the $1.03 billion expected by analysts. Wolfspeed — The semiconductor manufacturer tumbled about 9%. Wolfspeed posted an adjusted loss of $6.11 per share in the fiscal second quarter , worse than the loss of 95 cents a share it posted in the year-ago period. The company sees revenue for the current quarter ranging from $140 million to $160 million, down from revenue of $168 million in the fiscal second quarter, due to “accelerated fiscal first half customer purchases.” E.l.f. Beauty — The beauty stock popped 1% after E.l.f. raised its full-year guidance . The company is calling for adjusted earnings of $3.05 to $3.10 per share, while analysts polled by FactSet sought $2.87 per share. Fiscal third-quarter results also topped expectations, with E.l.f. reporting adjusted earnings of $1.24 per share, surpassing the 72 cents analysts polled by LSEG had penciled in. The company’s revenue of $490 million also exceeded the $460 million consensus estimate. Arm Holdings — The U.S.-listed shares of the British semiconductor and software design company dropped 6.6%. Arm’s fourth quarter guidance only narrowly beat Wall Street’s estimates, as the company called for adjusted earnings of roughly 58 cents versus the LSEG consensus call for 57 cents a share. Third-quarter adjusted earnings of 43 cents per share on revenues of $1.24 billion topped the earnings of 41 cents per share and $1.22 billion in revenue expected by analysts. Snap — The social media stock jumped 5% after fourth-quarter revenue outpaced estimates. The Snapchat parent earned 3 cents per share on revenue of $1.72 billion. According to LSEG, analysts had anticipated revenue of $1.7 billion. Global average revenue per user also was stronger than expected at $3.62 versus a StreetAccount estimate of $3.56. O’Reilly Automotive — Shares of the auto parts supplier fell nearly 5% after disappointing fourth-quarter earnings. The company earned 71 cents a share on sales of $4.41 billion. Analysts surveyed by FactSet expected the company to earn 73 cents per share on average. For fiscal year 2026, the retailer estimates it will earn between $3.10 and $3.20 per share. Analyst had expected earnings of $3.32 for the full year. Broadcom , Nvidia – Shares of the chip giants jumped in extended trading after Alphabet said that it expects to spend as much as $185 billion on capital expenditures this year. The Google parent is ramping up capital expenditures to build out data centers focused on artificial intelligence. Broadcom rose about 5%, while Nvidia gained nearly 2%. —CNBC’s Christina Cheddar-Berk, Sarah Min and Lisa Kailai Han contributed reporting.