Check out the companies making the biggest moves midday: Braiin — The AI platform stock surged 62% after the company launched its Aria, an AI agent designed for the real estate industry. “We believe this creates a scalable recurring software opportunity within a global real estate software market forecasted to reach approximately $32 billion by 2033,” CEO Natraj Balasubramanian said in a statement. AppLovin — The software stock tumbled 12%, making it the worst-performing S & P 500 member to start the week. The decline also put AppLovin on pace for its sixth daily loss in seven sessions. Biogen — Shares added almost 2% after Truist upgraded the biotechnology name to buy from hold. Truist said the stock could see upside after Biogen releases the latest data from investigational drug trials. Nio — U.S.-listed shares of the China-based electric vehicle company rose 3%. Goldman Sachs upgraded the stock to buy from neutral , saying Nio should deliver fast volume growth, a premium margin profile and a strong profit/free cash flow turnaround this year. Its new price target of $7 suggests 46% upside from Friday’s close. SpaceX — Elon Musk’s rocket company tumbled to a fresh post-IPO low, inching closer to its offering price of $135. Shares are down nearly 4% in midday trading and have lost more than 13% over the past week. The downwar …