Fourth-quarter earnings season begins next week with results from the nation's largest banks and semiconductor makers, the first hard look investors will get at how tariffs and artificial intelligence spending reshaped corporate profits in late 2025.

Jim Cramer, host of CNBC's "Mad Money," said Friday the coming reports will replace speculation with numbers. "No more guesswork," he said. "We're about to go into the wide world" of actual results.

The stakes are highest for two sectors. Banks will show whether elevated Treasury yields and a slower pace of dealmaking dented lending margins. Chipmakers will reveal whether the AI data-center buildout is still accelerating or beginning to plateau after two years of explosive demand.

Stocks closed higher Friday, led by the tech sector, as traders recovered from a volatile week. Treasury yields remained elevated, pressuring rate-sensitive shares and keeping borrowing costs high for consumers and businesses alike.

Bank earnings carry particular weight because the Federal Reserve's rate path remains uncertain. If net interest margins compress, it signals the central bank's past cuts are finally eating into the profit banks earn on loans. If they hold steady, lenders have proven more resilient than analysts feared.

Chipmakers face a different test. Nvidia, the largest beneficiary of AI infrastructure spending, has seen its revenue climb for eight consecutive quarters. Any sign of slowing orders from cloud providers would ripple through the entire semiconductor supply chain, from equipment makers to memory producers.

The broader market enters earnings season with the S&P 500 near record highs, leaving little room for disappointment. Companies that miss revenue or profit targets have been punished swiftly in recent quarters, with single-day share drops of 10% or more becoming routine.

Tariffs remain a wild card. Import duties imposed over the past year have raised input costs for manufacturers, and executives will face questions about whether those expenses are being passed to customers or absorbed into margins.

Cramer said the week ahead marks a turning point for investors who have spent months trading on sentiment rather than fundamentals. "We're about to go into the wide world" of real numbers, he said, a shift that will either validate the market's optimism or expose it as premature.

Earnings reports from the major banks arrive Tuesday and Wednesday, with chipmakers following later in the week.