Microsoft Stock After Hours Today (Dec. 17, 2025): MSFT Holds Near $476 as OpenAI–Amazon Talks and CPI Loom

Microsoft Corp. (NASDAQ: MSFT) ended Wednesday’s session essentially flat and edged higher in early after-hours trading, as investors digested fresh headlines around OpenAI’s funding outlook, Wall Street’s latest take on Azure’s AI profitability, and a high-stakes U.S. inflation report scheduled before Thursday’s opening bell.

Microsoft stock after the bell: MSFT price action recap (Dec. 17, 2025)

Microsoft shares closed Wednesday at $476.09, down $0.30 (-0.06%) on the day. In the first minutes of extended trading, MSFT ticked up to about $476.67 (up $0.58 after hours as of 4:01 p.m. ET), signaling a calm initial reaction after the closing bell. ^[1]

Intraday, the stock traded between $475.27 and $479.89 with volume of roughly 15.16 million shares, leaving traders with a tight range to watch heading into Thursday. ^[2]

Why the muted move matters: When MSFT holds steady into the close—especially on a macro-heavy week—it often means investors are waiting for the next “big signal,” which in this case arrives before Thursday’s open: U.S. CPI.

The headlines driving Microsoft sentiment today

1) OpenAI–Amazon funding talks put Microsoft’s OpenAI stake back in focus

A key story circulating Wednesday is a Reuters report that Amazon is in talks to invest about $10 billion in OpenAI, in discussions described as “fluid,” potentially valuing OpenAI at more than $500 billion. ^[3]

For Microsoft shareholders, the most market-relevant details are the ones that touch Microsoft directly:

Reuters reported that Microsoft holds a 27% stake in OpenAI and has an exclusive right to sell OpenAI models to its cloud customers. ^[4]
Reuters also noted the talks highlight OpenAI’s ability to partner more broadly after restructuring, and that OpenAI had previously signed a large cloud deal with Amazon. ^[5]

Why this matters for MSFT:
Microsoft’s AI narrative is closely tied to Azure’s ability to monetize frontier models and the broader “AI infrastructure” spending cycle. Any shift in how OpenAI funds itself, sources compute, or expands partnerships can influence investor assumptions about Azure demand, competitive positioning versus AWS, and the economics around Microsoft’s OpenAI-linked revenue streams.

Importantly, even if the headline is Amazon-focused, it still lands on Microsoft because it directly intersects with the OpenAI ecosystem that investors treat as a key MSFT growth lever.

2) Morgan Stanley reiterates “Top Pick” call—spotlighting Azure AI margins

Another major driver today came from a Morgan Stanley research note summarized by Investing.com. The bank reiterated Microsoft as its Top Pick in large-cap software, citing robust demand and operating margin expansion potential. ^[6]

Key takeaways investors are parsing from the note:

Morgan Stanley said meetings with Microsoft executives reinforced confidence in durable mid-teens top-line growth and improved ROI translating into continued operating margin expansion. ^[7]
The note pointed to “high-teens EPS CAGR” that it argues is not reflected in the stock. ^[8]
The bank highlighted Azure AI as a central driver and said Azure AI gross margins (excluding OpenAI revenue share) could be around 20% already, with a path toward ~30% by FY29 (and potentially higher). ^[9]
Investing.com also reported the note’s view that future OpenAI funding could boost “other income” and shareholder value. ^[10]

A separate summary of Morgan Stanley commentary published today emphasized the same theme—Azure AI margins improving and the potential for upside from Azure—based on the firm’s discussions with Microsoft leadership. ^[11]

Why this matters tonight:
The market has been sensitive to the idea that Big Tech’s AI capex is enormous—and that not every participant can win equally. A margin-focused Azure AI thesis is one of the more direct counterarguments to “AI spending fatigue”: it shifts the debate from how much Microsoft must spend to how profitably Microsoft can convert spend into durable cloud earnings power.

3) Macro backdrop: tech and “AI funding jitters” weighed on broader markets

Even if MSFT itself was quiet after-hours, the wider tape matters—especially for a mega-cap that trades as a macro proxy.

Reuters’ market wrap described:

Tech stocks leading losses and renewed worries about an AI bubble narrative, with investors scrutinizing the “circularity” of AI infrastructure spending and revenue. ^[12]
Investors waiting for the next inflation reading (due Thursday) while assessing delayed data amid a federal government shutdown. ^[13]

This macro framing is important for Thursday: CPI can swing yields, and yields can swing mega-cap tech multiples—even when company-specific news is unchanged.

Microsoft’s own ecosystem updates landing today (smaller, but notable)

Not every MSFT headline moves the stock overnight, but several Microsoft ecosystem updates today reinforce the company’s positioning in enterprise AI and data platforms:

Microsoft’s Partner Center announcements state that SQL Server 2025 will be available for purchase for Cloud Solution Provider (CSP) partners starting Dec. 17, 2025, with pricing stated as unchanged versus SQL Server 2022, and with SQL Server 2022 scheduled to reach End of Sale on Jan. 21, 2026. ^[14]
Microsoft’s Ignite 2025 “Book of News” notes Power Apps customers can begin previewing a unified Copilot Chat experience starting Dec. 17, aimed at reducing context switching between productivity and business apps. ^[15]
A Business Wire release today highlighted EcoVadis winning a Microsoft partner award and described EcoVadis leveraging Azure AI to build an AI assistant for procurement workflows—another example of customers building enterprise AI applications on Azure. ^[16]

These items are unlikely to drive after-hours volatility on their own, but they add color to the bigger MSFT story investors care about: enterprise AI adoption translating into durable platform usage.

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

1) CPI is the main event—before the open

The U.S. Bureau of Labor Statistics lists the next CPI release as:
“The Consumer Price Index for November 2025 is scheduled to be released on December 18, 2025 at 8:30 A.M. Eastern Time.” ^[17]

The New York Fed’s economic indicators calendar also shows CPI (8:30 a.m. ET) and the Philadelphia Fed Manufacturing Survey (8:30 a.m. ET) on Dec. 18. ^[18]

Why Microsoft investors should care:
MSFT often trades like a “long-duration” asset—meaning shifts in inflation expectations and bond yields can materially affect valuation multiples. A hotter-than-expected CPI print can pressure growth stocks broadly; a cooler print can do the opposite.

2) Consensus expectations for CPI and other key 8:30 a.m. data

A Reuters “Day Ahead” preview (via TradingView) summarized expectations as follows:

CPI (Nov) is forecast +0.3% m/m, with +3.1% y/y expected
Core CPI (Nov) is forecast +0.3% m/m, with core +3.0% y/y expected
Initial jobless claims are expected around 225,000
Philly Fed index forecast around 3.0 ^[19]

Separately, the Cleveland Fed’s daily inflation “nowcast” on Dec. 17 showed its model-based estimate for November 2025 CPI at +0.32% m/m and core CPI at +0.25% m/m (with y/y figures also provided). ^[20]

How to interpret this for MSFT into Thursday:

If CPI comes in meaningfully above expectations, yields can jump, and the first reaction often hits mega-cap tech (including MSFT) regardless of company news.
If CPI comes in below expectations, the AI/tech complex can see a fast relief bid—especially if the market has been leaning cautious.

3) Watch for follow-through (or reversal) in the AI infrastructure narrative

Reuters flagged that investors are on guard for signs AI demand is tailing off or that massive AI spending isn’t paying off. ^[21]
That theme can create “headline sensitivity” for Microsoft to anything involving:

cloud capacity supply (chips, data centers),
OpenAI funding and compute sourcing,
enterprise AI pricing and margins.

In other words: even if Microsoft doesn’t publish company news overnight, the AI ecosystem can still move the stock.

4) Simple MSFT levels traders will be watching at Thursday’s open

From Wednesday’s session, two obvious reference points stand out:

Near-term resistance area: Wednesday’s high around $479.89
Near-term support area: Wednesday’s low around $475.27 ^[22]

In a CPI-driven session, those levels can break quickly—but they’re still the first “map” many traders use in premarket planning.

Bottom line: what the MSFT setup looks like heading into Thursday

Microsoft stock is entering Thursday with modest after-hours movement and two dominant narratives in play:

Company-specific: investors weighing OpenAI’s evolving funding/partnership landscape (including Amazon talks) alongside bullish sell-side commentary focused on Azure AI margins and long-run earnings power. ^[23]
Macro-driven: CPI and related data before the open that could reprice yields and risk appetite—often the deciding factor for mega-cap tech on the day. ^[24]