Bond Yields Reach Multi‑Year Peaks as Inflation Concerns Shake Stock Markets

TLDR

• The 30-year U.S. Treasury yield reached a two-decade high of 5.14%, while the 10-year climbed to 4.62%, its highest point in 15 months.
• Increasing yields are applying downward pressure on stock valuations, with the S&P 500 trading at 21.3x forward earnings—significantly above its long-term average of 16x.
• Robust Q1 corporate earnings, which rose 28% year-on-year, are currently supporting stock prices.
• Closure of the Strait of Hormuz and escalating Iran-related tensions are pushing oil prices above $100 per barrel, intensifying inflation concerns.
• Analysts caution that equity markets have not yet fully incorporated the risk of a prolonged inflation surge.

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(SeaPRwire) –   U.S. Treasury yields surged to multi-year peaks on Monday as global bond markets experienced a broad sell-off. Investors are growing increasingly worried that stock markets have not adequately factored in rising inflation risks.

It simply won’t stop.

It is Sunday night and the US 10Y Note Yield just casually hit 4.63%, the highest since February 2025.

We are now ~4 basis points ABOVE the high that prompted President Trump’s “90-day tariff pause” in April 2025.

This puts the 10Y Note Yield up +70 basis… pic.twitter.com/SGjFmq8ieo

— The Kobeissi Letter (@KobeissiLetter) May 18, 2026

The 10-year Treasury yield increased to 4.62%, marking its highest level in 15 months. The 30-year Treasury bond yield climbed to 5.14%, reaching a two-decade peak.

The market downturn extended across international markets. German 10-year bund yields advanced to 3.18%, while Japan’s 10-year bond jumped 13 basis points to 2.74%.

The sharp rise in yields comes as new Federal Reserve Chair Kevin Warsh confronts surging consumer prices and elevated import costs. Central bankers are now under heightened scrutiny ahead of an upcoming G7 finance ministers meeting in Paris.

Oil prices are further fueling inflation worries. Brent crude surged to $111.16 per barrel on Monday, with U.S. West Texas Intermediate trading at $107.56. Both remain well above normal levels due to ongoing uncertainty surrounding a temporary U.S.-Iran ceasefire.

Why Stocks Are Still Holding Up

Despite significant turbulence in the bond markets, U.S. stocks have maintained their footing. The S&P 500 has gained over 8% year-to-date, even after declining nearly 1% on Friday.

The primary driver is robust corporate earnings. U.S. companies reported first-quarter profits approximately 28% higher than the same period last year—the strongest growth since late 2021.

Jeremiah Buckley, portfolio manager at Janus Henderson, highlighted AI-driven productivity gains as a key contributor. He noted these benefits could persist through 2027.

However, the S&P 500 is currently valued at 21.3 times forward earnings estimates, substantially above the historical average of 16x, prompting questions about how much additional upside remains for equities.

“Traders prefer not to adopt a bearish stance unless there is a clear indication that the Strait of Hormuz situation will be resolved within the next few weeks,” commented Tim Murray of T. Rowe Price.

The Risks Investors Are Monitoring

Several investment professionals are taking precautionary measures. Paul Karger of TwinFocus maintains substantial allocations in cash, gold, commodities, and large-cap growth stocks.

Jack Ablin of Cresset Capital warned that even a brief delay in reopening the Strait of Hormuz could establish “a completely new inflation environment for which investors are currently unprepared.”

Producer prices recorded their largest increase in four years during April. Peter Tuz of Chase Investment Counsel observed that inflation appears deeply entrenched in the economy and could trigger further market declines if it continues.

Capital Economics alerted clients that equity markets are failing to price in the potential impact of a sustained Hormuz closure to the same extent as bond markets.

Matthew Gertken of BCA emphasized that the Iran crisis has the capacity to fundamentally alter market direction for the remainder of the year.

The situation remains highly volatile. With oil trading above $100, Treasury yields at multi-year highs, and the Iranian ceasefire still fragile, financial markets face a period of considerable uncertainty in the coming weeks.