The first-quarter results for top U.S. banks were mixed due to volatile markets, including a selloff in technology stocks, the Iran war, and concerns about the private credit sector. Interest income rose across the big four U.,S. lenders as loan demand rebounded and borrowers were encouraged to take on debt again. However, concerns about softening labor markets and uncertainty on the Federal Reserve's rate path are likely to keep banks cautious. Credit quality remains stable, with banks flagging only modest changes even as investors watch for signs of stress.