Stocks and bonds are moving in opposite directions at a pace not seen since the tail end of the dot-com era. The rolling 30-day correlation between the S&P 500 and the 10-year Treasury yield has plunged to -0.68, while the 2-month correlation sits at -0.70, marking the largest opposite-direction move of the 21st century.
To put that in context: at the start of 2026, this same correlation was positive at roughly +0.40, near multi-year highs. In other words, stocks and yields were moving together. Now they’re moving apart with the kind of force that makes portfolio managers rethink their entire allocation strategy.
What’s actually happening here
The 10-year Treasury yield hit 4.62% as of May 21, creating what amounts to a gravitational pull away from equities. When you can park money in government bonds earning north of 4.5% with essentially zero credit risk, the calculus for owning volatile assets changes meaningfully.
In English: bonds are becoming genuinely competitive with stocks for investor dollars, and the market is repricing accordingly.
