AI Infrastructure stocks sit at the crossroads of powerful themes: solid global demand for data, resilient consumer spending in markets like the US, and heavy investment in technology supply chains from hubs such as Hong Kong and Singapore. While inflation and interest rate paths still matter, many investors are looking for companies that turn AI demand into real-world cash flow through data centers, power, cooling, and connectivity. This AI Infrastructure Stocks screener narrows that universe to businesses with measurable revenue and operating discipline. Below, the article highlights three notable stocks identified by this screener for further research.

Celestica (TSX:CLS)

Overview: Celestica is a Toronto based manufacturing and supply chain company that builds and manages complex hardware for original equipment makers and cloud and AI service providers. It covers everything from product design and component sourcing to full system integration and after market support across sectors such as communications, data centers, aerospace and defense, industrial and HealthTech.

Operations: Celestica generates about US$3.2b in revenue from its Advanced Technology Solutions segment and about US$10.6b from its larger Connectivity & Cloud Solutions segment, which is closely tied to hyperscaler and AI infrastructure spending.

Market Cap: CA$59.3b

Investors looking at AI infrastructure may find Celestica interesting because it sits directly in the build out of next generation data centers. Its Connectivity & Cloud Solutions segment is tied to hyperscaler demand for advanced networking and AI racks, while its Advanced Technology Solutions business provides exposure to aerospace, industrial and HealthTech customers. Strong recent earnings, high return on equity and raised 2026 revenue guidance highlight a business that is scaling quickly. However, there are notable pressure points, including heavy reliance on a handful of large cloud customers, a funding structure built on external borrowing and a newer board. How those strengths and vulnerabilities interact as Celestica expands campuses and AI partnerships is an important consideration for investors.

Celestica’s AI data center story is accelerating. The real question is how revenue guidance, funding choices and customer concentration fit together in one picture. Get the full context in the analysis report for Celestica

Lumentum Holdings (LITE)

Overview: Lumentum Holdings is a San Jose based photonics company that supplies the lasers, optical chips, and modules that move data inside cloud and AI data centers, as well as industrial lasers used in semiconductor, solar, display, and electric vehicle manufacturing. Its customers include hyperscale cloud operators, AI and machine learning infrastructure providers, telecom equipment companies, and manufacturers that rely on precision laser tools.

Operations: Lumentum generates revenue across key manufacturing hubs, with major contributions from the United States (US$523.1m), Thailand (US$494.4m), Hong Kong (US$460.7m), Mexico (US$318m), and other regions across Japan, Europe, the Middle East, Africa, and the broader Asia Pacific.

Market Cap: US$65.5b

Investors watching AI infrastructure closely may find Lumentum interesting because it sits at the intersection of cloud optics, AI data center build outs, and industrial laser demand. The company has recently drawn attention from large partners, index inclusion, and multiple broker upgrades tied to co packaged optics and optical circuit switches. At the same time, the stock carries a high P/S multiple, relies on external borrowing rather than customer deposits, has experienced earnings swings, and has seen insider selling and share price volatility, so expectations are already elevated. The key consideration for readers is how AI related demand drivers, growth projections, and balance sheet choices compare with concentrated customers, rare earth supply risks, and a heavy investment cycle that still needs to translate into sustained free cash flow.

Lumentum’s AI optics story is accelerating, but the real tension sits between a high P/S multiple, customer concentration, and rare earth exposure, so the 4 key rewards and 2 important warning signs might reshape how you see the next move

Flex (FLEX)

Overview: Flex is an Austin based manufacturing and supply chain company that designs, builds, and manages complex hardware and systems for data centers, communications, automotive, industrial, healthcare, and power customers across the Americas, Asia, and Europe, including advanced power and liquid cooling solutions for AI data center deployments.

Operations: Flex generates about US$6.6b in Cloud and Power Infrastructure revenue, US$11.1b from Integrated Technology Solutions, and US$10.2b from Regulated Manufacturing Solutions, supported by large manufacturing footprints in Mexico, the US, China, and other regions.

Market Cap: US$55.2b

Flex provides direct exposure to AI data center build outs through its cloud and power infrastructure segment, while also linking into regulated healthcare and automotive electronics that can add stability as the business evolves. Earnings and revenue are forecast to grow faster than the broader US market, and recent news around S&P 500 inclusion, a spin off of the Power and Cloud portfolio, and new AI focused power products has put the stock firmly on institutional radar. At the same time, thin margins, heavy reliance on a handful of large hyperscaler customers, higher use of external borrowing, and recent insider selling mean expectations are already demanding and execution needs to stay tight for this AI infrastructure story to keep working.

Flex’s AI infrastructure growth story is accelerating, but thin margins and heavy reliance on major hyperscalers leave key questions unanswered, so the analyst forecasts for Flex could be the piece investors are missing

The three AI infrastructure stocks covered here are only a starting point, as the full AI Infrastructure Stocks screener surfaces 47 more companies that sit in the physical core of AI with equally compelling stories around data centers, cooling, and high density power. Use Simply Wall St to identify the catalysts that matter most to you and analyze the specific revenue drivers, capital intensity, and cash conversion traits behind each of these infrastructure plays, so you can focus on the opportunities you have the highest conviction in.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.