AI Dominates 40% of S&P 500, Half of Bond Market — SkimNews
Get the Finance newsletter
Daily finance — markets, central banks, M&A, the prints that move money. Free.
- Torsten Slok, Apollo's chief economist, declared the classic 60-40 portfolio framework dead, arguing investors must now distinguish between "AI vs. non-AI" rather than stocks vs. bonds.
- The top 10 companies in the S&P 500 now make up approximately 40% of the index's total value, with nine of the ten having businesses tied to AI — Eli Lilly being the lone exception.
- Nvidia leads the S&P 500 at a 7.5% weighting, followed by Apple (6.8%), Alphabet (6.4%), and Microsoft (4.2%), according to Apollo's data.
- AI infrastructure now accounts for 49% of all net new investment-grade bond issuance, while massive debt offerings from Oracle and SpaceX have received a lukewarm reception from investors.
- Venture capital flows have skewed even more dramatically — 87% of 2026's net new venture investment has gone to AI companies versus just 13% for non-AI.
- Slok expects the AI data-center buildout to drive roughly half of the 2% real GDP growth projected for the U.S. economy in 2026, noting that so far only semiconductor and equipment makers are profiting from the technology.
Why it matters: With nine of the top ten S&P 500 companies tied to AI and AI infrastructure now representing 49% of investment-grade bond issuance, investors seeking diversification may inadvertently hold concentrated AI exposure across stocks, credit, and venture capital — leaving portfolios exposed if the data-center buildout disappoints.
Ask SkimNews
