Micron's AI Memory Boom Just Blew Past Every Estimate

Micron Technology just posted numbers that make even seasoned chip watchers do a double take. The memory maker's stock climbed in after-hours trading Wednesday after fiscal fourth-quarter revenue nearly quadrupled year over year, and the guidance for the quarter ahead topped Wall Street's best-case scenarios.

Revenue hit $54.23 billion for the quarter, more than triple what Micron posted a year earlier. Net income climbed to $37.7 billion, or $32.87 per share, up from $3.2 billion a year ago. These aren't rounding errors — they're a company fundamentally re-rated by the AI buildout happening across the chip sector.

The driver is high-bandwidth memory, the specialized DRAM stacks that feed Nvidia and AMD's AI accelerators. Fourth-quarter DRAM revenue jumped 343% from a year ago to $39.8 billion, representing 73% of total sales, as CNBC reported this week. Micron is also working with Nvidia on what CEO Sanjay Mehrotra called the industry's first custom HBM implementation.

For the current quarter, Micron is guiding to roughly $61.5 billion in revenue and adjusted earnings per share of $38.15 — both well above the $57 billion and $35.40 analysts had penciled in, according to LSEG consensus data. That's a beat-and-raise pattern the company has now delivered multiple quarters running.

"At this point, I have not heard any negative data points pointing to the memory cycle reversing toward a decline anytime soon for the foreseeable future." — Hendi Susanto, Portfolio Manager, Gabelli Funds

That's not just one portfolio manager's hunch. Wall Street has been racing to keep up with Micron all month. Baird lifted its price target to $1,520 from $1,280 heading into the print, while JPMorgan reaffirmed an Overweight rating and a $1,540 target, betting the company would beat on revenue, margin, and earnings before the numbers even hit the tape.

For investors who already own MU, the message is simple: don't rush to take profits just because the stock is up more than 500% over the past year. The HBM shortage driving these numbers isn't a one-quarter blip — Micron is spending $250 billion to build new HBM-focused campuses in New York and Idaho, and rivals SK Hynix and Samsung are racing to do the same thing on their own turf.

For investors on the sidelines, the entry math gets trickier after a run like this. Micron's market cap now tops $1.2 trillion, and the Street's average price target still implies meaningful upside — but a stock that's already quadrupled leaves less room for error if AI capital spending ever slows down.

The risk worth watching isn't demand — it's margins. Micron's own executives flagged that raising pay for employees worldwide, partly in response to labor pressure in Taiwan, will weigh on profitability even as revenue surges. Rivals SK Hynix and Samsung have already paid bonuses north of $500,000 to head off similar strikes at their own plants.

There's also a supply-side wildcard worth tracking. Micron holds the smallest HBM market share among the big three memory makers, and both Samsung and SK Hynix are mid-buildout on massive new factories in South Korea. If that capacity comes online faster than expected, today's shortage-driven pricing power could soften before Micron's own new fabs are ready to offset it.

For now, the setup still favors staying long rather than chasing an exit at these levels. Watch the November-quarter numbers for confirmation that HBM4 shipments are ramping on schedule, and keep an eye on DRAM contract pricing — any sign of a price rollback would be the first real signal the cycle is starting to turn.

There's a political wrinkle too. Mehrotra met with President Trump this week at a summit on AI regulation, days after attending a White House dinner with Chinese President Xi Jinping. How Washington handles chip export policy and China trade relations could matter as much to Micron's next leg as the memory cycle itself.

Micron just proved the AI memory trade is still intact. The bigger test comes next quarter, when the company has to show the beat-and-raise pattern can continue without fresh margin surprises tripping up the story.