Take a look at the companies making headlines in midday trading: Alphabet – The online search giant launched its latest quantum chip, called Willow. Alphabet said this marks a major breakthrough in quantum computing, sending its shares up 4%. Quantum computing is considered the next step for many technology companies. Oracle – Shares fell 8% after the cloud infrastructure company fell short of Wall Street's fiscal second-quarter expectations. The company also issued disappointing second-quarter guidance, saying it expects earnings per share to be between $1.50 and $1.54, versus an LSEG estimate of $1.57. Alaska Air Group – The airline's stock price rose more than 14% after Alaska Air posted better-than-expected fourth-quarter earnings and said it expects to grow profits by $1 billion through 2027. The company is also plans to launch nonstop flights next year to Tokyo and Seoul from homeport Seattle. SiriusXM — The radio operator fell 10% after the company hired a new chief operating officer and announced cost-cutting initiatives. SiriusXM said it will target initial incremental savings of $200 million annually as it exits 2025, citing “market headwinds.” The company also said it will shift its marketing and other resources from “expensive, high-churn audiences into streaming.” Vail Resorts – Shares rose 3.4% after the ski area operator beat revenue expectations and reported a narrower quarterly loss than analysts expected. Morgan Stanley and Barclays were among the companies that raised their price targets for the company after the financial report. HealthEquity — The custodian of health savings accounts gave a disappointing revenue forecast, saying it expects fiscal 2026 revenue between $1.275 billion and $1.295 billion. That's lower than the $1.32 billion that analysts polled by FactSet had expected. The shares in turn lost more than 4%. Pinterest – Shares fell 3.4% after Piper Sandler downgraded the social media company from “overweight” to “neutral,” citing two quarters of mixed results from the company and a competitive advertising field suggested by the company's ad buyer survey . T-Mobile – The mobile communications services company saw its share price rise 2.4% after positive comments from CEO Mike Sievert, who expressed optimism about the company's growth plans. Centene – Shares of the managed healthcare company fell 3.6% after being downgraded to underperform versus Jefferies. The investment firm said Centene could be hurt by the expiration of federal health care subsidies and increased government oversight, given its exposure to the Affordable Care Act exchanges. MongoDB – Shares fell about 13.4% after the company's Chief Financial Officer and Chief Operating Officer resigned effective Jan. 31. The news overshadowed a better-than-expected third-quarter report and strong fourth-quarter guidance. eBay – Shares fell more than 3% after Jefferies downgraded the online marketplace to underperforming stocks. The company cited declining advertising revenue and a slowdown in China as headwinds to growth. American Airlines Group – The stock is up nearly 3% thanks to an upgrade at Bernstein to outperform market performance. American Airlines' ability to reduce debt, thanks to an improving industry backdrop and the airline's new credit card deal, improves its prospects, Bernstein said. CoreCivic — Shares rose 3.4% on an upgrade from Wedbush Securities, outperforming neutral. Analyst Brian Violino said the private prison operator should benefit from the mass deportations promised by newly elected President Donald Trump, noting that the need for additional beds for Immigration and Customs Enforcement could be greater than previously expected. Toll Brothers — The homebuilding company fell 6% despite a profit and revenue decline in the fiscal fourth quarter. Toll Brothers reported earnings per share of $4.63 on revenue of $3.33 billion. Analysts polled by FactSet expected earnings of $4.34 per share on revenue of $3.17 billion. Norwegian Cruise Line – Shares rose 3.1% following Goldman Sachs' upgrade to buy from neutral. Goldman said the cruise line has improved its business and deserves a higher price-to-earnings ratio. – CNBC's Alex Harring, Hakyung Kim, Samantha Subin, Yun Li, Lisa Kailai Han, Jesse Pound and Michelle Fox contributed reporting.