AI Stocks Face Proof Test as MSFT, GOOGL, AMZN Report

Microsoft, Alphabet and Amazon report earnings on Oct. 28-29 as investors look for proof that AI stocks' record capex is producing cloud revenue and profit growth.

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What Are Investors Looking for in Big Tech Earnings?

Investors want evidence that cloud revenue is growing fast enough to justify capital spending that has risen sharply all year. Attention has moved from headline earnings growth to the scale of data center, chip and networking outlays and the date at which they turn into profit.

Alphabet has raised its 2026 capex guidance twice, from $175-$185 billion in February to $195-$205 billion in July. Amazon lifted its 2026 plan to about $220 billion from $200 billion. Microsoft has guided fiscal first-quarter capex above $50 billion and expects spending to rise through fiscal 2027.

Why Is AI Spending Under Scrutiny?

AI spending is under scrutiny because the rise in outlays is now outpacing the rise in free cash flow. Amazon's trailing free cash flow turned negative at about -$7.6 billion, and its net capex reached $53.1 billion in the second quarter. Investment-grade bond issuance by AI-focused technology companies in September and October ran at more than double the sector's 2015-2024 annual average.

The market has shown it will punish spending increases. Meta (META) fell 6% to 8% after warning that its capex would be larger in 2026 than in 2025. Nasdaq Amazon shares moved the other way in July, rising more than 8% after the capex increase, because AWS growth accelerated alongside it.

What Do Microsoft's Results Need to Show?

Microsoft needs to show Azure growth at or above its guidance of about 45% in constant currency. Azure and other cloud services grew 43% in the June quarter, up from 40% in March. Consensus calls for revenue of about $90.7 billion and earnings of about $4.72 a share, against guidance of $89.85-$90.95 billion in revenue.

The company's AI revenue run rate is $37 billion, up 123% from a year earlier. Investors will also look at cloud gross margin, which is expected to hold steady despite higher component prices and finance-lease interest costs, and at bookings tied to OpenAI, which can swing quarter to quarter.

Can Alphabet and Amazon Sustain Cloud Momentum?

Both companies posted accelerating cloud growth last quarter, and this week shows whether it continued. Google Cloud revenue rose 82% to $24.8 billion in the second quarter. Consensus for Alphabet is revenue of about $128 billion and earnings of about $3.00 a share.

AWS grew 37% to $42.2 billion in the second quarter, its fastest pace in 18 quarters, with a 39.4% operating margin. Amazon guided third-quarter sales to $197-$202 billion and operating income to $22.5-$26.5 billion. Consensus sits near $202 billion in revenue and $1.96 a share, which implies about 12% revenue growth but almost flat earnings. Advertising revenue, which grew 26% to $19.8 billion last quarter, is the other pillar for Amazon.

Market Context

The reports arrive alongside the federal reserve's rate decision on Oct. 28, so earnings reactions will play out against a policy signal. Higher borrowing costs matter more for companies funding data centers partly with debt, and credit default swaps on AI-linked issuers are near their widest levels of the year.

Outlook

The three reports will show whether cloud growth is keeping pace with capex that now runs into the hundreds of billions of dollars. Azure near 45%, Google Cloud above 80% and AWS in the mid-30s would support the case for continued spending. Any slowdown, or a further capex increase without matching revenue, would extend the pressure seen in Meta's shares and renew scrutiny of the AI trade across the Nasdaq.