In this article, we take a look at the 10 Best Performing AI Stocks Over the Last 3 Years.
The strongest AI-linked stock returns of the past three years have often followed the physical buildout of computing capacity rather than the broad software narrative alone. Chips, memory, optical links, storage, power systems, cooling equipment, and rack integration have all become important parts of a capital-intensive supply chain. Stanford HAI’s 2026 AI Index puts global corporate AI investment at $581.7 billion in 2025, up 130% from 2024, while private AI investment reached $344.7 billion. The scale of deployment is also visible in electricity use. The International Energy Agency says data centers consumed about 485 terawatt-hours in 2025, with demand rising 17%. Electricity use at AI-focused facilities increased 50%.
Spending remains elevated. Reuters reported that JPMorgan expected five large technology companies to invest roughly $730 billion in 2026. That supports demand across the infrastructure chain, but it also raises the standard for execution. Power availability, component supply, financing costs, and the pace of customer monetization may determine which businesses retain pricing power. PIMCO has estimated that capital spending could absorb 94% of major hyperscalers’ operating cash flow over the next two years, compared with 40% in 2023. The industry backdrop is therefore substantial, though high valuations and the possibility of overbuilding still warrant some restraint.
Source: unsplash
Methodology
We screened U.S.-listed companies with material exposure to the AI value chain and reviewed their full three-year trading history through the July 9 close. From these, we selected 10 companies with the highest 3-year annualized returns and ranked them accordingly.
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10. Ciena Corporation (NYSE:CIEN)
Ciena Corporation (NYSE:CIEN) is one of the best performing AI stocks over the last 3 years, with a 3Y CAGR of 120.4%. On June 8, UBS reiterated its Hold rating on the stock and raised its price target to $508 from $285. The action followed Ciena’s fiscal second-quarter report, where revenue rose 40% year over year to $1.57 billion, and adjusted earnings came in ahead of FactSet estimates, MarketWatch reported. UBS analyst David Vogt’s caution centered on expectations rather than the headline numbers.
He wrote that the market had been pricing in a “more material beat and raise” than Ciena delivered. Ciena still raised its fiscal 2026 revenue outlook to $6.2 billion to $6.4 billion and guided fiscal third-quarter revenue above Wall Street estimates. The gap between strong results and an even stronger setup explains the neutral stance: Ciena remained tied to AI-driven optical networking demand, but the stock had already climbed sharply into the report. Ciena also said its high-speed connectivity strategy across wide-area networks and data centers was aligned with multi-year AI demand.
Ciena Corporation (NYSE:CIEN) provides networking systems, services, and software used by communications service providers, cloud operators, governments, and enterprises to move, manage, and optimize high-bandwidth network traffic.
9. Vertiv Holdings Co (NYSE:VRT)
Vertiv Holdings Co (NYSE:VRT) is one of the best performing AI stocks over the last 3 years, with a 3Y CAGR of 134%. On June 12, Vertiv completed its acquisition of ThermoKey, an Italian provider of heat-rejection and heat-exchange equipment. The transaction adds dry coolers, heat exchangers, and systems compatible with low-global-warming-potential and natural refrigerants. It also expands manufacturing capacity in Europe, the Middle East, and Africa. That is relevant to AI infrastructure because rising rack densities are making cooling design a facility-level constraint, not merely an accessory to server deployment.
Vertiv has already used ThermoKey technology in selected products, which may reduce integration risk. The combination also extends Vertiv’s coverage across the thermal chain, allowing it to address heat removal beyond the immediate rack. The investor question is whether the acquired capacity can be converted into profitable growth without weakening execution. The deal appears strategically aligned with demand for denser computing, but returns will still depend on project timing, pricing and disciplined integration.
Vertiv Holdings Co (NYSE:VRT) supplies critical digital infrastructure, including power management, thermal management, racks, monitoring systems, and lifecycle services for data centers, communications networks, and commercial and industrial facilities.
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