The AI Build-Out
Billions of dollars are being poured into AI infrastructure every year. A handful of tech companies now carry about a third of the entire US stock market.
Projected AI infrastructure spend in 2026
Today, seven tech companies are a third of the market.
In 2004, the top seven made up a sixth of the market and were spread across six different industries.
Each block is a company, sized by its weight in the S&P 500. The red blocks are the Magnificent Seven: about 32% of the entire index, and every one a tech or AI company. In 2004, no such cluster existed.
- NVDANvidia$5.4T7.9%
- AAPLApple$5.2T7.7%
- GOOGLAlphabet$3.6T5.3%
- MSFTMicrosoft$3.0T4.5%
- AMZNAmazon$2.4T3.6%
- METAMeta$1.4T2.0%
- TSLATesla$0.9T1.4%
Source: SPDR S&P 500 ETF (SPY) daily holdings, State Street · As of July 2026 · How to read this
A handful of giants are carrying the U.S. stock market.
The red and grey lines are two real S&P 500 indices tracked from the start of 2025. Weighted by size, the market is up about 23% since the start of 2025. Weighted evenly, with every company counting the same, it is up about 19%. When the size-weighted market outruns the evenly-weighted one, the gains are coming from the biggest companies, not the average one.
| Month | Weighted by size | Weighted evenly |
|---|---|---|
| Jan '25 | +0.0% | +0.0% |
| Feb '25 | +-1.3% | +-0.6% |
| Mar '25 | +-7.1% | +-4.4% |
| Apr '25 | +-7.9% | +-6.7% |
| May '25 | +-2.1% | +-2.7% |
| Jun '25 | +2.7% | +0.3% |
| Jul '25 | +5.0% | +1.3% |
| Aug '25 | +7.2% | +4.1% |
| Sep '25 | +10.7% | +4.7% |
| Oct '25 | +13.3% | +3.7% |
| Nov '25 | +13.6% | +5.7% |
| Dec '25 | +13.3% | +5.7% |
| Jan '26 | +15.0% | +9.3% |
| Feb '26 | +14.0% | +13.1% |
| Mar '26 | +8.1% | +5.9% |
| Apr '26 | +19.4% | +12.2% |
| May '26 | +25.7% | +15.2% |
| Jun '26 | +24.1% | +17.4% |
| Jul '26 (live) | +22.8% | +18.7% |
Each bar estimates how much a company added to, or subtracted from, the market’s rise since the start of 2025: its weight in the index times its own price move. Some of the Magnificent Seven are pulling the market up; a few are quietly dragging.
| Company | Stock return since Jan 2025 | Estimated points added to the S&P 500 |
|---|---|---|
| Nvidia | +64% | +3.8 pts |
| Apple | +43% | +2.8 pts |
| Alphabet | +60% | +2.4 pts |
| Amazon | −3% | −0.1 pts |
| Meta | −14% | −0.4 pts |
| Microsoft | −6% | −0.4 pts |
| Tesla | −24% | −0.5 pts |
Source: Yahoo Finance, SPY (cap-weighted S&P 500) & RSP (S&P 500 Equal Weight) · As of June 2026 (updates through the trading day) · How to read this
Only the tech-linked category is actually growing.
Over the past year, investment in computing gear jumped 64%. Every other kind of business equipment barely moved, flat or a little up or down.
Each bar is one type of business equipment. Its length shows how much investment in that category grew or shrank over the past year — stretching right for growth, left for decline.
Source: U.S. Bureau of Economic Analysis — Table 5.3.6 (via FRED) · Year-over-year, as of Q1 2026 · How to read this
The build-out is running ahead of the money behind it.
The money the AI build-out needs, and the prices being paid, are both running far ahead of the money actually coming in.
Gap one — the money it needs
The build-out needs far more revenue than it’s on track to earn.
Hyperscalers keep stepping up combined data-center and AI spend, while revenue directly attributable to AI remains a fraction of the outlay. The shortfall is bridged with debt, off-balance-sheet vehicles, and vendor financing — the gap widens quietly.
Revenue needed by 2030
$2T
to fund the build-out
On track for
$1.2T
at the current pace
The shortfall
$800B
still to be found
Source: Bain & Company — Global Technology Report 2025 · As of September 2025
Gap two — the prices being paid
Prices have run far ahead of the earnings to justify them.
This is a separate gap. Even if financing were sound, today’s multiples assume the eventual cash flows not only arrive but arrive large enough to justify the price. It is a question of discounted expectations, not liquidity — the distance between value priced in and value delivered.
Source: Goldman Sachs · As of December 2025