Apple Stock Is Up 22%, but 1 Slowing Business Could Test That Valuation

AAPL has gained 22% in 2026 and now trades at 38x earnings, a premium multiple that leaves little room for error. The pressure point is the services business, where growth is cooling.

Services generates 40% of Apple's gross profit, making it a disproportionate driver of earnings quality. Year-over-year growth in the segment has slowed from 12% to 10%. The expectation for Q1 2027 is a further step down to 8-9%.

That trajectory matters because the stock's valuation is built on durable, high-margin growth, not just hardware demand. Strong product sales are currently supporting the story, but they don't carry the same margin profile as services. Interpretation: if services growth keeps decelerating toward the 8-9% range, the case for paying 38x earnings gets harder to defend, and multiple compression becomes the main risk rather than an earnings miss.

The setup is straightforward. A 22% year-to-date run has already priced in a lot of good news, while the segment responsible for 40% of gross profit is moving in the wrong direction. Each incremental slowdown narrows the cushion beneath the current multiple.