Treasury Buybacks, Rising Yields — When Do Stocks Need a Rethink?

Two weeks of larger Treasury buybacks, yet long-term yields are still climbing.

That matters for stocks because the risk-free rate is moving higher at the same time equity valuations are already elevated.

The Treasury expanded its long-end buyback operations to at least $4B per operation, with a $6B 20–30 year operation on September 24. The program is primarily intended to improve liquidity in older Treasury securities — it isn’t a tool that can directly control long-term yields.

And the bond market is making that distinction clear.

The key move

The U.S. 10-year yield jumped roughly 15bp to 5.11%, its highest close since 2007. The 30-year yield also reached multi-year highs.

At the same time, October Fed hike expectations moved sharply higher as investors reacted to stronger economic data and hawkish Fed commentary.

That creates a difficult setup for equities.

A higher Treasury yield means investors can demand a higher return from stocks. If earnings expectations don’t rise at the same pace, the valuation multiple investors are willing to pay can compress.

So what yield level matters?

There isn’t one magic number.

The more useful question is how fast yields are rising and whether corporate earnings can keep up.

A 5% 10-year yield accompanied by strong earnings growth is a very different environment from 5% yields alongside falling earnings expectations.

That’s why watching the relationship between:

10Y yield ↑ + earnings estimates ↑

versus

10Y yield ↑ + earnings estimates ↓

may tell us more than the yield itself.

The bigger test for stocks

The recent selloff shows the market is sensitive to the rate shock: the Nasdaq fell 1.13% while the S&P 500 lost 0.75% on Wednesday.

But one day’s decline doesn’t establish a new equity regime.

If yields remain elevated, investors may increasingly ask whether paying high multiples for future earnings still makes sense.

The real trigger isn’t necessarily 5%, 5.5% or 6%.

It’s the point where the combination of higher discount rates + weaker earnings revisions becomes large enough to materially change the valuation math.

That’s the number I’d watch.

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