Check out some of the companies making the biggest midday moves: SpaceX — SpaceX's stock added 2%. Elon Musk's rocket company is slated to report its first quarterly results as a public company on Tuesday, and a key insider lockup provision is set to expire on Thursday. Bearish bets against the rocket company have climbed, with short sellers holding 32.2% of the company's publicly tradable float, according to S3. Palantir Technologies — Shares rose 2% ahead of the data analytics and artificial intelligence software company's earnings report, expected after the closing bell. Analysts anticipate second-quarter revenue of $1.81 billion and earnings of 34 cents per share, according to StreetAccount. Travel stocks — Companies tied to the travel industry saw shares rise as oil prices dropped. Shares of cruise operators Norwegian and Carnival rose 4% and almost 2%, respectively. Shares of American Airlines and United Airlines gained about 5% each. Artificial intelligence infrastructure — Traders kicked off August buying shares of companies involved in AI infrastructure. Shares of AI cloud computing play CoreWeave jumped 15%, while Nebius ' stock advanced more than 13%. Vertiv , a maker of cooling systems for data centers, saw shares rise nearly 7%. Shares of photonics companies Coherent and Lumentum gained 9% and 6%, respectively. GameStop — The video game retailer and onetime meme stock darling saw shares tumble more than 12% after it announced a private exchange of $1.4 billion in convertible senior notes for equity. The exchange is expected to close on or about Sept. 23, and GameStop won't receive any cash proceeds from the issuance of shares. Amazon — The dominant e-commerce platform saw shares climb another 5% to a record, pushing Amazon's market value above $3 trillion for the first time. The stock is advancing for a third day as a stronger-than-expected earnings report last week boosted sentiment. The rally followed robust second-quarter cloud growth fueled by continued demand for AI services. Software — Software stocks rose as a group, as tech names outside of semiconductors caught a bid. The iShares Expanded Tech-Software Sector ETF (IGV) climbed more than 2% in midday trading, though it remains lower by more than 8% year to date. Notable advancers included Salesforce , which saw shares gain nearly 3%, and Adobe , which saw share rise almost 2%. Corning — Shares of the specialty glass and optical fiber manufacturer rallied more than 5% after an upgrade by Truist to buy from hold. The bank said the stock has a "more reasonable entry point" following a recent sell-off. AstraZeneca , Bristol Myers Squibb — Shares of the pharmaceutical companies moved in opposite directions after the Financial Times reported that the two were in talks to merge. AstraZeneca's stock fell almost 9%, while Bristol Myers' stock was marginally higher. ArcelorMittal — The stock rose more than 1% after the steelmaker deepened a technology partnership with Microsoft. ArcelorMittal said Microsoft's Azure will serve as the backbone in modernizing its technology systems and that it will implement other infrastructure services by Microsoft into its systems. Shares of Microsoft were up 4%. Alibaba — U.S.-listed shares of the Chinese e-commerce platform gained 5% after Alibaba unveiled a new AI model on Monday. Qwen3.8-Max, set to be officially released next week, is said to be one of the most powerful models in the company's portfolio . Ferguson Enterprises — Shares were up 8% after S & P Dow Jones Indices said Friday that Ferguson will join the S & P 500 , replacing Electronic Arts before the market opens Wednesday. EBay — The e-commerce platform tumbled 4% after Wells Fargo downgraded eBa to underweight from equal weight. The bank said eBay's acquisition of Depop, completed last week, will lead to weaker earnings in fiscal year 2027 and potentially increased spending on marketing. Memory stocks — Shares of memory storage companies were broadly lower to start the week, following choppy trading last week . Micron Technology 's stock was down about 1%, while shares of Seagate Technology were off 5%. Western Digital 's stock slid more than 4%. Circle Internet Group — The stablecoin issuer's stock declined almost 5% after Morgan Stanley downgraded Circle to underweight from equal weight. The investment bank said the company faces tactical and structural headwinds, including a weaker outlook for USDC, the stable coin tied to the U.S. Dollar, in circulation in 2027. Tyson Foods — Shares of the meat processing company erased earlier losses and were last up more than 2%. Fiscal third-quarter adjusted earnings per share matched expectations, but revenue of $13.87 billion missed the FactSet consensus call. Tyson also trimmed its operating income outlook for the fiscal year. — CNBC's Sarah Min, Yun Li, Michelle Fox, Alex Harring, Nick Wells and Darla Mercado contributed reporting.