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The AI Buildout Just Turned Into America’s Biggest Construction Project

Big Tech is not dabbling in AI anymore. It is pouring concrete, signing power deals, and buying compute like it is racing a deadline.

The eye-popping part is not just the dollar figure, it is the scale: projected 2026 AI infrastructure spending from Meta, Amazon, Microsoft, and Alphabet is being compared to the biggest capital pushes in modern US history.

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The cleanest way to frame this story is that AI has moved from software hype to physical buildout.

These four giants are planning up to roughly $670B in capex in 2026, mainly aimed at data centers, chips, networking, and the infrastructure required to run and scale AI workloads.

As a share of GDP, it is sitting in the same zip code as historic national buildouts.

That matters because capital cycles this big do three things:

1) They create second-order winners.
The hyperscalers will capture the AI platform value, but the durable cash flows often show up in the supply chain that sells the infrastructure every quarter, regardless of which model is trending.

2) They shift the market’s question from who has the best AI to who has the best ROI.
When capex rises toward 30% to 50% of sales for some companies, investors stop cheering spending for its own sake.

They start demanding proof: utilization, revenue per unit of compute, and margin expansion tied to AI products.

3) They make constraints the story.
The bottleneck is not just GPUs. It is power availability, cooling, networking throughput, lead times, and the ability to deploy at scale without breaking reliability targets.

When constraints drive the timeline, the companies enabling throughput and uptime often gain pricing power.

The other key dynamic is that the market can punish even great businesses if spending ramps faster than confidence.

Amazon’s market value hit after its capex ramp is a reminder that investors will tolerate big checks only if the narrative stays tight: spend now, monetize soon, defend margins throughout.

So the investor playbook is not to argue whether AI capex is too high.

It is to position around where the money must flow no matter what: data center capacity, high-speed networking, and the hardware stack that turns compute into usable output.

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Actionable Stuff

  • Treat this like an infrastructure cycle, not a gadget cycle. The recurring winners are the ones selling core plumbing: networking, interconnect, power management, and data center real estate.

  • Follow utilization signals. The best tell is not capex, it is whether cloud and AI revenue growth accelerates enough to justify it.

  • Prefer toll collectors over moonshots. Picks that benefit from volumes and deployments can be less fragile than single-product AI bets.

  • Watch lead times and backlog quality. In a buildout, backlog matters only if it converts cleanly and does not come with margin pain.

  • Expect volatility. When spending is historic, the market constantly reprices how much is investment versus excess.

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Top Picks

Arista Networks (NYSE: ANET)

If AI is the new interstate highway system, networking is the asphalt.

Arista sits in a prime spot because hyperscalers need faster, denser, more reliable connectivity inside and between data centers to move AI workloads efficiently.

As AI clusters scale, the value of high-performance switching and network software rises because the cost of bottlenecks explodes.

This is one of the cleanest ways to play the buildout without needing to pick which model wins.

What to watch: Cloud and AI-driven order commentary, 800G adoption trends, and any signs that competitive pricing pressure is easing or intensifying.

Broadcom (NASDAQ: AVGO)

The AI buildout is not only GPUs. It is also custom silicon, networking components, and the infrastructure that makes data centers run at industrial scale.

Broadcom is positioned across multiple layers of that stack, and its exposure can benefit as hyperscalers pursue more customized hardware to optimize cost and performance.

In a capex arms race, optimization becomes a feature, not a footnote.

What to watch: AI-related semiconductor revenue trajectory, custom silicon momentum, and margin discipline as volumes ramp.

Digital Realty Trust (NYSE: DLR)

When spending turns physical, data center landlords become a direct beneficiary.

Digital Realty is a way to play the demand for capacity and interconnection as hyperscalers expand footprints and enterprises follow them into AI-ready infrastructure.

In a world of power constraints and long build times, well-located, power-secured capacity becomes more valuable.

What to watch: Leasing spreads, power availability commentary, and any improvement in funding conditions if rates drift lower.

Super Micro Computer (NASDAQ: SMCI)

Super Micro is a higher-beta way to play the buildout because it sits close to where capex turns into shipped systems.

When hyperscalers and enterprises accelerate deployments, demand for optimized server and rack-scale solutions can surge.

This one can move fast in both directions, but it fits the moment: massive capex plans ultimately translate into physical orders and buildouts that need to ship now, not someday.

What to watch: Order cadence, supply chain stability, gross margin trend, and any customer concentration risk that starts to matter more in a volatile tape.

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Bottom Line

This is not a normal tech spending cycle. It is a national-scale infrastructure push financed by four balance sheets.

The best way to play it is to focus on the inevitable spending channels: networking that prevents bottlenecks, silicon and components that improve efficiency, and the data center capacity required to house it all.

The story will stay noisy, but the capex gravity is real.

That’s it for today’s edition—thanks for reading! Reply to this email with any feedback or let me know which macro trends or markets you’d like me to cover next.

Best Regards,
—Noah Zelvis
Macro Notes