Micron Technology (MU) Stock After Hours Today (Dec. 17, 2025): Record Q1 Results, Massive Q2 Guidance, and What to Watch Before Tomorrow’s Open

Micron Technology, Inc. (NASDAQ: MU) is in the spotlight tonight after reporting fiscal first-quarter 2026 results after the closing bell on Wednesday, December 17, 2025—and the stock is reacting immediately in extended trading.

MU stock after the bell: the after-hours move and why it matters

Micron shares finished the regular session at $225.64 and were trading higher in after-hours activity shortly after the results dropped. Investing.com showed MU around $235.85 in after-hours trading (+4.58%) at roughly 4:04 p.m. ET. ^[1]

A separate extended-hours data source (Public.com) reported MU at $238.39 at 4:30 p.m. ET, up about 5.6% from the regular-session close, with an after-hours range that reached as high as $241. ^[2]

That “pop after hours” is consistent with what traders were bracing for heading into the print. Earlier in the week, Investopedia highlighted options pricing that implied Micron could swing up to ~9% by the end of the week after earnings. ^[3]

The headline: Micron just posted record fiscal Q1 revenue—and guided far above expectations

Micron’s earnings release was packed with numbers that help explain the after-hours strength:

Fiscal Q1 2026 (quarter ended Nov. 27, 2025): the key results

Micron reported (GAAP vs. non-GAAP):

Revenue:$13.643B (record) ^[4]
Diluted EPS:$4.60 GAAP, $4.78 non-GAAP ^[5]
Gross margin:56.0% GAAP, 56.8% non-GAAP ^[6]
Operating cash flow:$8.411B ^[7]
Investments in capex, net:$4.505B and adjusted free cash flow:$3.906B ^[8]

From these figures, revenue was up about 20.6% sequentially (vs. $11.315B in fiscal Q4 2025) and about 56.7% year-over-year (vs. $8.709B in fiscal Q1 2025). ^[9]

Micron also disclosed $878M in proceeds from government incentives in the quarter’s cash-flow detail—an item investors often watch closely because it can materially affect free cash flow optics and funding flexibility during capex-heavy cycles. ^[10]

The “beat vs. estimates” angle (what Wall Street expected vs. what happened)

A fast, widely-circulated earnings recap from Investing.com stated Micron’s non-GAAP EPS of $4.78 beat the analyst estimate of $3.94 by $0.84, while revenue of $13.64B topped the $12.83B consensus. ^[11]

That’s important because expectations going into this report were already high. For example, Investopedia cited Visible Alpha estimates looking for about $12.93B revenue and $3.96 adjusted EPS. ^[12]

In other words: Micron didn’t just clear the bar—it cleared a bar that had been rising.

Guidance: the real catalyst investors will focus on before tomorrow’s open

For many semiconductor stocks (and especially memory), guidance is the story—because pricing, supply discipline, and customer digestion can turn quickly.

Micron’s outlook for fiscal Q2 2026 was striking:

Revenue:$18.70B ± $0.40B ^[13]
Gross margin:68.0% ± 1.0% (non-GAAP) ^[14]
EPS:$8.42 ± $0.20 (non-GAAP) ^[15]

And here’s the comparison Wall Street will be modeling tonight: Investing.com reported that Micron’s Q2 revenue guide ($18.70B) compares with an analyst consensus near $14.23B. ^[16]

If that consensus figure is broadly representative across data providers, the implication is straightforward: Micron is signaling a much stronger near-term demand and/or pricing environment than the Street had penciled in.

Micron CEO Sanjay Mehrotra underscored the tone, saying the company’s Q2 outlook reflects “substantial records across revenue, gross margin, EPS and free cash flow.” ^[17]

Business-unit detail: where the strength showed up in Q1

Micron’s release also broke out results across four business units—useful tonight because it tells investors whether AI-driven demand is concentrated or broadening:

Cloud Memory Business Unit: revenue $5.284B (with 66% gross margin) ^[18]
Core Data Center Business Unit: revenue $2.379B (with 51% gross margin) ^[19]
Mobile and Client Business Unit: revenue $4.255B (with 54% gross margin) ^[20]
Automotive and Embedded Business Unit: revenue $1.720B (with 45% gross margin) ^[21]

Two quick takeaways investors often draw from this mix:

Cloud + data center exposure is large and improving. Cloud Memory and Core Data Center combined were a sizable portion of revenue, and their margins were strong. ^[22]
The cycle appears broader than just servers. Mobile/Client and Automotive/Embedded also posted meaningful revenue levels with improved margins. ^[23]

What “today’s” forecasts and analysis were saying before the print

To understand why MU sold off during the regular session but jumped after-hours, it helps to look at what analysts and commentators emphasized earlier today (Dec. 17):

Investing.com’s earnings preview said Wall Street was expecting $12.9B in revenue and $3.96 adjusted EPS, driven by rising memory pricing and AI data center buildouts. ^[24]
The same preview flagged the classic risk with memory: even when fundamentals are strong, the industry’s cyclicality can lead to oversupply later if capacity ramps too aggressively. ^[25]

In other words, the market came in expecting a strong quarter—but it needed Micron to prove that pricing strength and AI-led demand weren’t already “fully priced in.”

Analyst target activity today: the bull case is still intensifying

Even before the earnings release hit, analysts were still pushing targets upward.

A notable example from today: Investing.com reported Lynx Equity raised its Micron price target to $325 from $180, citing strong multi-year AI data center demand and what it described as extreme DRAM pricing movements tied to supply constraints. ^[26]

The same report also referenced multiple other bullish targets in the market (including $300-level targets from firms such as Needham and Wedbush, among others). ^[27]

Whether those targets change again after tonight’s guidance is one of the biggest “before the open” storylines—because fresh targets can drive premarket sentiment and momentum flows.

What to know before the stock market opens tomorrow (Thursday, Dec. 18, 2025)

Here are the specific things investors and traders typically watch overnight into the next session—especially after a volatile “earnings after-hours” move.

1) Watch the earnings call read-through (and management’s AI memory specifics)

Micron said it would host its earnings call at 2:30 p.m. Mountain Time on Dec. 17, with prepared remarks and slides posted to its investor site. ^[28]

By tomorrow morning, the market will be digesting:

How much of the upside is driven by pricing vs. volume
Whether management suggests supply remains tight (or hints capacity is catching up)
The outlook for “AI-enabling” memory and storage demand that Micron itself highlighted as a strategic focus ^[29]

2) Revisions: consensus estimates will likely reset upward

Investors should expect fast-moving updates to:

Next-quarter revenue/EPS estimates (especially given Micron’s Q2 guide) ^[30]
Full-year models, which can move price targets and quant screens quickly

3) The options market may amplify tomorrow’s move

Given the pre-earnings implied move commentary (around ~9%), it’s common to see:

Post-earnings volatility “crush” (options IV falling)
Large hedging flows at the open that can exaggerate the first 30–60 minutes of trading ^[31]

4) Remember: after-hours isn’t the same as “the market’s final verdict”

Tonight’s extended-hours jump (mid-$230s to high-$230s depending on timestamp) is meaningful, but after-hours liquidity can be thin. ^[32]

It’s not unusual for MU (or any mega-cap semiconductor name) to:

Open above the after-hours price on momentum
Or gap up and then fade if the market decides the guidance was “great but already priced in”

5) Cash flow, capex, and incentives are now front-and-center

Micron’s quarter included $3.906B in adjusted free cash flow with $4.505B in net capex investments, plus $878M in government incentive proceeds—details that matter for how investors value the sustainability of the upcycle. ^[33]

Tomorrow, watch for analyst notes that answer:

Is capex rising faster than demand?
Is Micron staying disciplined enough to avoid the classic memory oversupply trap? (a concern that even bullish previews flagged as a long-term risk) ^[34]

Bottom line: why Micron is likely to lead the semiconductor tape tomorrow

Micron’s after-hours rise is being driven by a combination of:

A clear earnings beat (EPS and revenue above consensus) ^[35]
A very aggressive Q2 outlook (revenue, margins, and EPS guidance well above what many analysts had been modeling) ^[36]
Continued confidence that Micron is positioned as an “AI enabler,” with management explicitly framing its portfolio and execution around AI-era memory and storage needs ^[37]

Between now and tomorrow’s opening bell (Dec. 18, 2025), the market will be doing one thing: deciding whether this is the next leg of an AI-driven memory supercycle—or whether Micron’s huge 2025 run means “good news” still needs to be extraordinary to push MU sustainably higher. ^[38]

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