Records Everywhere as the AI Trade Goes Nuclear

Tuesday was the kind of day that makes you question your assumptions: the S&P 500 and the Nasdaq both closed at record highs — the S&P's first record since mid-August, closing above 7,800 for the first time ever — and the sector that led the charge wasn't tech. It was utilities. Bonds got a breather, oil steadied, and the AI trade found a new favorite costume: a nuclear power plant. **What Happened** The S&P 500 rose 0.58% to 7,818.93, its 28th record close of 2026. The Nasdaq added 0.45% to 27,599.79, back-to-back records. The Dow gained 253 points (0.49%) to 51,521.28 — still about 5% below its early-August peak. Small caps missed the party: the Russell 2000 slipped 0.59% to 2,830.44. Utilities jumped 3%, their biggest single-day gain in over five months. The star was Constellation Energy, up 12.3% (as much as 15% intraday) after Google signed a 20-year deal to buy 890 megawatts of new nuclear capacity from upgraded reactors in Illinois, Pennsylvania, and New Jersey — a $4.3 billion investment, with the first reactor due in 2028 — plus a separate 15-year agreement for 2,700 megawatts from existing plants. Chip stocks rebounded after Monday's split: Marvell gained about 6%, AMD nearly 3%, Broadcom 3.7%, and Nvidia notched its second straight record close. Ciena surged 13.9% while Seagate slumped 9.2%. Meanwhile, the 10-year Treasury yield fell about 4 basis points to 5.27%, retreating from Monday's 24-year high of 5.31%. The 2-year dropped to 4.789% and the 30-year to 5.641%. The Treasury's $58 billion 3-year note auction cleared at 4.932% — the highest yield for that maturity since May 2006 — with mixed demand: bid-to-cover of 2.62 was below average and foreign buyers pulled back, though near-record direct bidders filled the gap. **Why It Matters** The day's real story is the AI trade broadening beyond chips and into power. Utilities led the S&P on a record day — something that has happened only three times since 1990, per Dow Jones Market Data. The message is clear: the binding constraint on the AI boom isn't GPUs anymore, it's electrons, and investors are now paying power companies like tech stocks. Google has spent the past year stockpiling nuclear supply (NextEra's Iowa restart, Southern's upgrades, now Constellation), and Microsoft and Amazon have done the same — this is an arms race for baseload power. The yield pullback matters just as much. At 5.27%, the 10-year remains punishingly high, but four basis points of relief was enough to power a record close — a reminder of how tightly wound the equity market is around the bond market right now. **Under the Hood** A few wrinkles worth noting: first, speculative traders hold a record net short of more than 900,000 contracts in 10-year Treasury futures — a crowded position that could snap yields lower fast if auctions or data surprise, or grind equities down if it keeps growing. Second, the Russell's decline on a record-setting day means this isn't a uniform risk-on rally; it's large-cap AI exposure doing all the lifting. Third, BCA Research notes that tech companies that went public this year are down an average of 23% from their first trading day — the public market is a lot more skeptical of AI valuations than the venture market. And the $58 billion 3-year auction's soft foreign demand is worth watching: when the world's buyers blink at 4.93% yields, tomorrow's $39 billion 10-year auction will get real scrutiny. **What Hedgehog Is Watching** Today: FOMC minutes at 2 PM ET (from September's first rate hike in three years) and that $39 billion 10-year auction. Markets are pricing an 81% chance the Fed pauses this month but hikes in December — the minutes could shift that. Thursday brings jobless claims (around 195K expected), a $22 billion 30-year auction, and China's reopening; Friday brings UMich consumer sentiment and Delta's earnings. Next week: CPI on the 14th and PPI on the 15th, ahead of the October 27–28 FOMC meeting. Also: a tropical depression in the Gulf is forecast to become a hurricane Thursday — energy markets are watching. The market's bet right now is that the AI boom is real enough to absorb 5.27% yields and a hawkish Fed. Tuesday's record says the bet is still on. But with record bond shorts, heavy auction supply, and December-hike odds hanging around, the bond market gets a vote every single afternoon. Today's 10-year auction is its next turn to speak. Sources: The Wall Street Journal, Reuters, Barron's, CNN.