Thinking of Buying Micron Stock Now? Here's 1 Green Flag and 1 Red Flag.

Micron (NASDAQ: MU) stock has delivered extraordinary returns, up by more than 700% in one year. And that's after the stock suffered a sharp correction. As of this writing, the stock still trades 20% below its 12-month high.

Now investors face a tempting question: Is this finally the opportunity to buy Micron stock?

There is a strong argument in favor. But there is also one red flag investors shouldn't ignore.

Image source: Getty Images.

The green flag: Earnings have exploded

The strongest argument for buying Micron isn't simply that the stock has fallen from its high. It's that the underlying business has grown dramatically.

For perspective, Micron's fiscal 2026 third-quarter revenue reached a record $41.5 billion, up from $23.9 billion in the previous quarter and $9.3 billion a year earlier. Net income jumped to $28.2 billion in the period ended May 28, compared with $1.9 billion a year earlier. The company also generated $25.4 billion in operating cash flow during the quarter.

Those numbers tell an important story. Micron isn't simply riding a higher stock price. The company is generating vastly more cash and profit than it did a year ago. In particular, its data center business has grown significantly, generating more than $25 billion in revenue in fiscal Q3 alone.

Artificial intelligence (AI) has clearly changed the scale of Micron's business. And if that growth continues, today's share price could eventually look much more reasonable -- even after the stock's enormous rally.

In fact, according to Yahoo Finance, Micron's forward price-to-earnings (P/E) ratio is 6.23. This suggests that if Micron can sustain its profitability, the current stock valuation is not expensive at all.

That's the green flag. But it comes with an important caveat.

The red flag: Margins are unusually high

Micron's gross margin reached an astonishing 84.6% in the latest quarter. A year earlier, it stood at 37.7%. Micron even expects its gross margin to reach approximately 86% in the next quarter.

That's fantastic news for shareholders, suggesting that the recent rally in memory prices is continuing. But here's the catch. Micron operates in the memory industry, which has historically experienced sharp cycles.

When demand exceeds supply, prices rise, and manufacturers earn more money. Those profits encourage companies to add production. Eventually, additional supply can pressure prices and margins.

Micron has experienced that cycle before. So, the risk is, what if today's extraordinary margins represent the peak rather than the new normal?

The real question: How much can Micron keep?

This is where the bull and bear cases meet. The bullish argument doesn't require Micron to maintain an 85% gross margin forever. Instead, investors need to ask whether Micron can retain enough of today's profitability to keep growing its earnings over the next several years.

Suppose margins eventually decline, and there's a high chance that it will. Micron could still produce substantially more profit than it did before the AI boom, if revenue grows fast enough in the coming quarters.

But if revenue growth slows while margins fall, the earnings picture could change quickly. That's why investors shouldn't simply extrapolate today's results into the future. They need to determine how much of today's exceptional performance will survive in a more normal market.

What I'm watching in the coming quarters

Investors should keep an eye on three indicators to gauge future profitability. First, earnings growth. Micron needs to keep turning strong AI demand into higher profits. Second, margins. While margins don't need to remain at today's extraordinary levels, they need to settle at levels that support strong long-term returns. Third, supply. If Micron and its competitors add too much capacity, memory prices could eventually come under pressure.

Together, these indicators should tell investors whether Micron is experiencing a new normal or has simply reached an unusually profitable point in the memory cycle.

What does it mean for investors?

There are good reasons to buy Micron stock today, and to avoid it.

The green flag is clear: The business has become dramatically more profitable and could remain so if demand for AI infrastructure continues to grow. The red flag is equally clear: Micron's margins have reached levels that may prove difficult to sustain.

Ultimately, whether an investment in the stock today will be rewarding depends on whether Micron can retain enough of today's earnings improvement to justify its valuation and continue growing profits over time.

If it can, the recent volatility could eventually look like a buying opportunity. If it can't, investors may discover that the market has priced in too much of today's exceptional profitability.

Investors must decide which camp they belong to.

Lawrence Nga has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Micron Technology. The Motley Fool has a disclosure policy.