What happened
Nvidia, Micron, Taiwan Semiconductor, Broadcom, and AMD have all posted gains of 300% or more over the past three years, driven by rising demand for AI semiconductors. Micron has outpaced the group with a 1,320% three-year gain; Nvidia is up 448%. Most recently, Micron's revenue surged 345% to $41.5 billion in Q3 2026, while Nvidia's revenue rose 91% to $81.6 billion in its latest quarter.
Why it matters
These stocks have benefited from companies' heavy spending on AI infrastructure. Nvidia controls 86% of the data center and AI chip market as of end-2025, while TSMC holds about 90% market share for advanced processors. However, concerns are rising that tech companies' AI spending may not deliver proportional returns, and that memory chip prices—now at peak levels—will eventually fall as supply catches up to demand.
What to watch
Micron's stock trades at a price-to-earnings ratio of just over 19, well below the tech sector average of 35, suggesting it may offer value—but only if sustained AI data center spending continues. Any major decrease in data center capex could pressure Micron's margins and stock price. AMD has boosted capital expenditures by 142% year over year in the first half of 2026, raising investor questions about whether that spending will deliver adequate returns.
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The semiconductor sector has been the primary engine of stock gains tied to artificial intelligence expansion over the past three years. These five companies occupy different but complementary positions in the AI hardware ecosystem: Nvidia dominates GPU design with 86% market share in data center and AI chips; TSMC, a third-party foundry, commands 90% of advanced processor manufacturing; Broadcom specializes in custom AI chips (ASICs) for companies like Alphabet and OpenAI; AMD designs CPUs and GPUs for data centers; and Micron supplies memory chips critical to AI infrastructure. The surge in share prices reflects genuine operational strength—Micron's gross margins have reached nearly 85%, Nvidia's quarterly revenue rose 91%, and Broadcom's Q2 sales jumped 48%. However, the body surfaces a tension: while tech companies continue to signal that AI capex will rise further next year, investors increasingly question whether such spending will yield proportional returns. This concern is sharpened by the memory market, where undersupply has driven prices to unsustainable peaks; the body notes that as manufacturers build new capacity, this period of high pricing will eventually end, posing a downside risk to Micron and the sector more broadly.
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