Fundstrat’s Tom Lee warns a 6% 10-year Treasury yield would pressure stocks

Fundstrat strategist Tom Lee has drawn a line in the bond market. A 10-year Treasury yield of 5% is something stocks can live with, in his view. A yield of 6% is a different story.

Lee warned that a move to 6% would put significant pressure on stock valuations. According to the research findings, the yield climbed above 5% in mid-September and reached around 5.3% in early October 2026.

Why 6% is the number that matters

Lee framed the problem as competition. When a government bond pays a high, near-guaranteed return, stocks have to offer a lot more to justify the extra risk.

A 6% yield on the 10-year Treasury would create “much more competition for equities,” Lee said.

At 5%, Lee sees the math still working for equities, provided earnings stay strong. Third-quarter earnings are tracking near 29% growth, by Lee’s count. He also highlighted rising S&P 500 earnings estimates for 2027.

The 10-year hit 5.04% on September 15, 2026, around the time yields reached their highest level since 2007.

How yields got here

The climb followed the Federal Reserve’s first rate hike since 2023. That move set the Fed’s target range at 3.75%-4.00%.

Lee is not alone in watching the 6% level. Economist Ed Yardeni cautioned that if the 10-year yield sprinted to 6%, it could expose “real cracks” in the financial system. Yardeni’s emphasis is on speed: a rapid spike can catch leveraged players off guard, which is how a rates story turns into a financial stability story.

Lee’s case for optimism

Lee has suggested that yields could fall back below 5% within six months if inflation pressures ease. He views that outcome as a positive signal for risk assets.

He also noted that higher yields could benefit well-capitalized companies relative to weaker ones. When borrowing gets expensive, companies with strong balance sheets can keep investing without much pain, while firms that depend on cheap financing face higher costs.

What this means for investors

If yields keep pressing toward 6%, companies able to manage their financing needs, potentially including mega-cap technology firms, could attract more investor interest, while weaker companies with heavier funding needs may struggle as valuations come under strain.

The key variable to watch is the 10-year yield itself. At around 5.3%, it sits in Lee’s manageable zone but closer to his danger threshold than to the sub-5% level he hopes to see.

Lee’s call for yields to slip below 5% hinges on inflation pressures easing. His argument that stocks can handle 5% leans heavily on profit growth near 29% in the third quarter and rising 2027 estimates. Yardeni’s warning further suggests a fast run to 6% would be more dangerous than a slow one, because rapid repricing tends to expose hidden leverage.