Stocks fall as bond yields and oil rise; IonQ jumps on Nvidia quantum deal, McDonald's slides after Investor Day

Stocks fell Wednesday as bond yields climbed and oil prices rose amid Iran war uncertainty. IonQ gained 4.4% after its Superion 256 quantum system will be the first deployed at Nvidia's quantum research center. Palantir rose 3.7% as the FAA began using its AI tool for air-traffic control. McDonald's dropped 4.8% after outlining long-term targets and $8.5 billion in planned spending through 2036. Royal Caribbean fell 2% on its plan to buy 50% of Sandals Resorts. Paychex slid 8.8% as the S&P 500's worst performer. Mining stocks fell with gold's decline. Cracker Barrel rose 4.5% on earnings beat. General Mills, Worthington Enterprises also gained on earnings. Expedia dropped 7.7% despite partnership with Meta's Muse.