3 Best Tech Stocks to Buy in October

Key Points

• Nvidia's data center revenue hit $41.1 billion in Q2, up 56% year over year, as AI infrastructure demand shows no signs of slowing.

• Microsoft generated $281.7 billion in fiscal 2025 revenue with AI features embedded across its entire product suite, from Azure to Office.

• AMD posted record Q2 2025 revenue of $7.7 billion while positioning itself as the undervalued challenger in AI accelerators.

• 10 stocks we like better than Nvidia ›

Tech remains the market's growth engine, and artificial intelligence (AI) is the theme driving the biggest dollars. With third-quarter earnings season beginning and enterprises locking in 2026 IT budgets, October is a crucial month for separating hype from execution. Investors want to see which companies can turn AI enthusiasm into lasting revenue streams and which have the balance sheets to weather volatility.

Three standouts look well positioned: Nvidia (NASDAQ: NVDA), the dominant force in AI chips powering data centers worldwide; Microsoft (NASDAQ: MSFT), the cloud and productivity leader weaving AI into every layer of enterprise software; and Advanced Micro Devices (NASDAQ: AMD), the challenger carving out share in the fast-growing accelerator market.

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Image source: Getty Images.

Each offers a different way to invest in the next wave of technology adoption. Read on to find out more about these three dominant tech giants.

Riding the AI infrastructure wave

Nvidia remains the leading force in AI infrastructure, and its Q2 fiscal 2026 results underscore that dominance. The company reported $46.7 billion in revenue, up 56% year over year, with data center revenue reaching $41.1 billion, also up 56%.

In the same quarter, Nvidia benefited from a $180 million release of previously reserved H20 inventory, reflecting adjustments to past allocations. Over the first half of fiscal 2026, Nvidia returned $24.3 billion to shareholders through buybacks and dividends, demonstrating that even a high-growth company can deliver capital returns.

Momentum still looks strong. Nvidia's ability to integrate hardware and software, plus its relationships with hyperscalers, provide a structural advantage that's hard to replicate. As enterprises finalize 2026 budgets this October, any upward surprises in guidance -- especially regarding next-generation architectures -- could fuel further upside.

That said, risks remain: U.S. export controls, particularly on H20 chips, create uncertainty; inventory adjustments have already been part of recent quarters; and rivalry from AMD or cloud providers developing custom AI chips may erode margins over time.

The AI-infused cloud anchor

Microsoft offers one of the safest ways to invest in AI transformation. In Q4 fiscal 2025 (ended June 30, 2025), the company posted $76.4 billion in revenue, up 18% year over year, and net income of $27.2 billion. Across the full year, revenue reached $281.7 billion, growing 15%. Azure and other cloud services within the Intelligent Cloud segment grew 39%, showing strong AI-driven demand.

October is a key month because many enterprises finalize budgets for the next year. Microsoft's Azure with AI integration is positioned to capture cloud and infrastructure spending. The breadth of Microsoft's portfolio -- spanning cloud, operating systems, productivity, and enterprise services -- helps buffer volatility in any one area.

Embedding AI features across Office, Teams, and Dynamics further gives Microsoft the ability to monetize AI broadly, rather than focusing on a single niche. That said, expectations are steep: Any softness in cloud growth or regulatory scrutiny could significantly impact the stock.

A challenger with upside

AMD offers the contrarian play in AI chips. The company posted record Q2 2025 revenue of $7.7 billion with gross margins around 40%. On a non-GAAP basis, operating income hit $897 million with net income of $781 million. While these numbers pale next to Nvidia's, that's exactly the point: AMD trades at a fraction of Nvidia's valuation despite pushing deeper into AI and data center accelerators.

As AMD's strategy bears fruit, the market upside could be significant. Record Q2 revenue shows demand is real, not hype. If export restrictions ease or new products like the MI400 series gain traction, AMD could rerate as a legitimate infrastructure competitor. The company offers outsized return potential for positive surprises. But challenges remain: Margin pressure from write-downs, dependency on China regulatory clarity, and intense competition in AI accelerators all pose risks.

Three approaches to the AI boom

These three stocks represent the full spectrum of tech investing: Nvidia for pure AI dominance, Microsoft for diversified safety, and AMD for challenger upside. As Q3 earnings approach and 2026 budgets crystallize, October will reveal which companies can sustain their momentum.

The AI boom isn't ending, but the easy gains are behind us. Winners from here will be those executing on real revenue, not just riding sentiment.

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George Budwell has positions in Microsoft and Nvidia. The Motley Fool has positions in and recommends Advanced Micro Devices, Microsoft, and Nvidia. The Motley Fool recommends the following options: long January 2026 $395 calls on Microsoft and short January 2026 $405 calls on Microsoft. The Motley Fool has a disclosure policy.