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The Bond Market Is Now Underwriting The AI Boom

The AI boom stopped being an equity story this year. It is a credit story now.

September 13, 2026

For three years you were told the AI buildout was self-funding. Hyperscalers had the cash flow, the argument went, so the capex was free. That stopped being true this year. Goldman Sachs counts nearly $500 billion of AI-related debt sold through early August, roughly a fifth of all higher-rated US issuance, against 1% in 2024.

Now look at the other side of the trade you own. At the same moment, the US Treasury is funding a deficit near 6% of GDP and paying up to do it. The 30-year ended last week at 5.35%, a level last seen in 2007, and the term premium has rebuilt to about 0.8 percentage points.

Two of the largest borrowers on the planet are pulling from the same well, and the FOMC gavels in Wednesday with Fed chair Kevin Warsh holding the discount rate that prices all of it. Friday's August CPI, headline steady at 3.4% and core at 2.4%, pushed futures to roughly an 85% chance the committee actually hikes. Here is how to position before the dot plot lands.

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The Buildout Moved Onto A Balance Sheet You Own

Here is the scale you are dealing with. Debt now funds roughly a third of AI capital spending, rising toward 35% next year on Goldman's numbers, against a projected $5.3 trillion of capex from 2025 through 2030. Morgan Stanley pencils in around $570 billion of AI-related issuance this year alone.

Where that paper lands matters. Hyperscalers issue into the investment-grade index, which means the bond fund in your retirement account holds it. Neoclouds and developers lean on bridge loans that get taken out with bonds later, plus private credit for the rest. If you own a total bond market fund, you are an AI investor. You just were not asked.

Term Premium Is Not An Inflation Story

Last Thursday's $22 billion 30-year auction drew genuinely strong demand, with real money buyers taking down more than dealers did, and the yield still finished the week at 5.35%. That combination should change how you read the long end. Five-year inflation expectations are anchored around 2.2%.

Put those together, and the message to you is clear: buyers are not scared of inflation; they want compensation for locking up money against a heavy and growing supply calendar. Treasury doubled long-dated buybacks, and it barely moved the needle. When the risk-free curve reprices for supply, every asset valued off it reprices too, and the ones with cash flows furthest out reprice hardest.

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The Squeeze Few Models Account For

Your corporate holdings do not get to ignore the government's funding costs. A 30-year Treasury at 5.35% resets the base rate on every project finance model in the data center pipeline, and returns that penciled out at a 4% discount rate stop working at 5.5%.

That is the pinch point in this cycle. Not an AI demand collapse. A financing cost that climbs faster than the revenue ramp. Watch spreads on hyperscaler and data center paper more closely than you watch chip orders, because credit tightens the taps months before any tenant misses a payment.

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What Is Actually Holding This Together

Contracted demand you can verify: AEP's large-load pipeline runs to roughly 63 gigawatts with about 90% tied to data centers. These are signed agreements, not slideware.

Backlogs, not forecasts: Comfort Systems USA exited Q2 with a $14.06 billion backlog, up 73% year over year. That is booked work extending into 2027 and 2028.

Investment-grade balance sheets: The largest issuers still carry enormous cash flow, so this is a spread and concentration risk far more than a default risk.

Anchored inflation expectations: At 2.2% on the five-year, the Fed is fighting a supply-driven price problem rather than an expectations spiral.

Where It Could Break On You

Start with the part of the market you cannot see priced daily. Private credit is already showing strain in the smaller borrower tier, with stress among the smallest names up more than tenfold since 2023 by Houlihan Lokey's count, and the Fed has started formally counting nonbank exposure. Redemptions from the retail channel are eroding private credit's pricing edge against the syndicated market.

Add a yen funding shock to that. Japan's 10-year debt cleared 3% for the first time since 1996 and the currency has rallied to a seven-month high just under 154 per dollar into this week's Bank of Japan meeting, where a Reuters poll has the policy rate going to 1.25% on Friday. Cheap yen financed a lot of leverage across global credit. When the funding leg moves, the marginal buyer of everything steps back, and you find out which spreads were tight for a reason.

How To Play The Week Ahead

Own the toll booths, not the tenants: The landlords, contractors, and utilities collecting contracted payments capture the buildout without underwriting whether any model earns its cost of capital.

Get paid for duration risk instead of taking it: Bills and short credit pay you while the term premium rebuilds. Reach for the long end after the dot plot, not before.

Check your bond fund's top holdings: If a handful of AI-linked issuers dominate, you have equity-like concentration inside the sleeve you hold for safety.

Fade the story stocks that need cheap money: Anything valued on 2030 cash flows has a math problem with the 30-year above 5.3%.

Watch USD/JPY as your risk switch: A Bank of Japan hike into a strengthening yen is the cleanest early warning for a leverage unwind you will get.

Top Picks

Ares Management (NYSE: ARES)

The contrarian slot. Ares is one of the largest private credit managers in the world, so it sits exactly where the AI buildout goes for the capital banks will not hold, and it earns management fees on committed capital rather than on market direction.

The market has punished the whole alternatives group this year, and the stock trades roughly 30% below its 52-week high near $187 with a market cap around $29 billion.

You are being paid roughly 4.1% on the dividend to hold an asset gatherer through a credit repricing.

Risk to the thesis: redemptions keep pressuring fundraising, and further stress in smaller private credit borrowers extends the derating.

Digital Realty Trust (NYSE: DLR)

The landlord expression, and a deliberate one. Digital Realty leases data center capacity on long contracts to the same hyperscalers issuing all that debt, which puts it a layer above the financing risk while still capturing demand. Market cap runs near $69 billion.

Understand what you are buying: as a REIT it is genuinely rate-sensitive, so a 30-year yield grinding higher is a real headwind on the multiple even while the leasing pipeline stays full. That tension is the reason the entry looks reasonable here.

Risk to the thesis: development yields compress if construction and financing costs rise faster than releasing spreads.

American Electric Power (NASDAQ: AEP)

The power bottleneck, in regulated form. AEP's contracted large-load pipeline has grown to roughly 63 gigawatts, with about 90% of it data centers, and regulated utilities earn a return on the capital they invest to serve that load.

You collect a yield near 3.1% on a market cap around $67 billion while the rate base grows for reasons that have nothing to do with the economy. Data centers run at load factors above 80%, which makes them the highest-quality demand a utility can add.

Risk to the thesis: regulators in Ohio and elsewhere push back on who pays for capacity built against forecasts that may not fully materialize.

Comfort Systems USA (NYSE: FIX)

Your pick-and-shovel expression, and it comes with receipts. Comfort Systems builds the mechanical, electrical, and cooling systems data centers cannot open without, and it closed Q2 with a $14.06 billion backlog, up 73% year over year and nearly double 2025's level.

Management describes no letdown in hyperscaler capacity plans. The stock sits about 18% below its 52-week high near $2,074 on a market cap around $59 billion, after jumping more than 6% on Friday, so only some of the froth has come out.

Risk to the thesis: backlog conversion slows if projects get delayed by power interconnection queues, and the multiple stays vulnerable to any AI capex scare.

Where This Leaves You

The AI buildout is real, contracted, and increasingly debt-financed, which means its next constraint is the cost of money rather than the demand for compute. Meanwhile, the Treasury curve is repricing for supply, not inflation. Own the contracted layer of the buildout, keep your fixed income short and boring, know what your bond fund actually holds, and treat any leveraged AI equity as a position that gets marked against the 30-year Treasury every single day.

Setup Scorecard (Macro Trade: Long Contracted AI Infrastructure / Short Duration)

Entry Zone: Scale in Monday and Tuesday ahead of Wednesday's FOMC, adding on any pullback tied to the long end rather than to company news.

Target: Contracted infrastructure names outperforming the S&P 500 by 8% to 12% over the next two to three quarters, with the 30-year yield settling in a 5.0% to 5.4% band.

Stop Loss: Investment-grade spreads on AI-linked issuers widening sharply, or a hyperscaler cutting its capex guidance. Either one breaks the thesis, so cut rather than average down.

Catalyst Timeline: FOMC decision Wednesday, September 16, with the Warsh presser the same day; Bank of Japan decision September 18; Q3 hyperscaler capex updates in late October.

Confidence Level: High on the framework, moderate on timing. The financing squeeze builds over quarters, and one dovish dot plot can delay the whole repricing.

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