Apple (NASDAQ:AAPL) just delivered one of its strongest iPhone quarters ever, but the market’s reaction was surprisingly muted. Despite a blockbuster holiday season and eye-catching revenue growth, investors didn’t rush to re-rate the stock higher. Instead, the spotlight quickly shifted to what could slow Apple down in the months ahead.

That’s why Apple stock valuation has become the real debate. Even when Apple posts record iPhone numbers, the stock can struggle to move if investors believe future growth and profitability are already fully priced in.

In the December quarter, Apple reported revenue of $143.8 billion, up 16% year over year and well ahead of expectations. The iPhone segment led the charge, producing a record $85.3 billion in revenue. That’s a 23% year-over-year jump, with strength across every geographic region.

Under normal circumstances, a quarter like that could ignite a major rally. But Apple stock barely moved after earnings, suggesting investors are focused less on what Apple just achieved and more on what could disrupt momentum next.

Supply Constraints Could Cap Near-Term iPhone Upside

One of the biggest issues coming out of the quarter was supply. Apple acknowledged that demand for the newest iPhone lineup was stronger than anticipated, leaving the company with lean inventory at quarter-end. That might sound like a “good problem,” but it still creates a risk: Apple may not be able to fully capture demand in the near term if it can’t get enough units into customers’ hands.

The concern is that supply chain flexibility is tighter than normal, which could restrict iPhone sales in the March quarter. For investors, that’s an important detail because it means the record iPhone quarter may not translate into a smooth follow-through in the next period.

In other words, strong demand is only part of the story. The market wants to see Apple convert that demand into consistent product availability, especially when the company is being priced like a premium growth stock.

Rising Memory Costs Are a Growing Margin Headwind

Beyond supply, cost pressures are another reason Apple stock valuation is under scrutiny. Management noted that memory pricing had only a minimal impact on gross margin in the December quarter, but the company expects a larger hit in the March quarter.

Looking further ahead, Apple sees memory prices rising significantly. That’s not a trivial issue. Apple’s scale gives it enormous leverage, but even small cost increases can have a meaningful impact when you’re selling hundreds of millions of devices and investors are watching margins closely.

Apple has built its reputation on maintaining strong profitability through premium pricing, operational efficiency, and a high-margin services business. If component costs rise faster than Apple can offset them, the company could face pressure on margins—even with strong revenue growth.

Services Growth Helps, but Doesn’t Solve Everything

Apple’s long-term story remains strong, largely because of its ecosystem. The company now has more than 2.5 billion active devices in its installed base, giving it a massive platform to monetize through subscriptions and recurring digital services.

In the latest quarter, services revenue hit a record $30 billion, up 14% year over year. Growth was broad-based, with advertising, music, payments, and cloud services all showing double-digit gains in paid subscribers. Even better, services gross margin climbed to 76.5%, improving by 120 basis points sequentially, driven largely by mix.

Apple expects services revenue growth to continue at a similar year-over-year pace in the current quarter. That’s a key support for the overall business because services provide stability and help protect margins when hardware cycles become less predictable.

Still, services can’t fully offset a major slowdown in iPhone growth if supply constraints linger or if cost pressures expand beyond expectations.

Is Apple Stock a Buy Right Now?

Apple guided for second-quarter revenue growth of 13% to 16% year over year, even after factoring in iPhone supply constraints. That implies underlying demand remains healthy. The company also expects gross margin between 48% and 49% in the March quarter, slightly above the 48.2% reported in the prior quarter, helped by product mix and operating leverage.

However, Apple stock valuation remains the sticking point. Apple stock trades at roughly 31.4 times forward earnings, which is a high multiple relative to expected earnings growth. Wall Street forecasts EPS growth of 9.5% in fiscal 2026 and 11.6% in 2027, and those projections could come under pressure if memory costs rise faster than expected or if margins tighten.

Apple stock still holds a “Moderate Buy” consensus rating, and the long-term fundamentals remain attractive. But after a record iPhone quarter, the stock’s muted reaction suggests investors may want more clarity on supply and cost trends before calling Apple stock a near-term buy.

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