Anticipated earnings reports from the world’s largest stocks boosted the S&P 500 and Nasdaq to new all-time highs Monday, marking the latest records for both indexes in recent weeks, though one analyst warned investor optimism might be short-lived as others say AI firms could propel the rally even more.

That helped to offset big gains for some homebuilders after they reported stronger profits for the spring than Wall Street had forecast. D.R. Horton rallied 14.5%, and PulteGroup rose 9.2%. That was even as both companies said homebuyers are continuing to deal with challenging conditions, including higher mortgage rates and an uncertain economy.