US and Japan Long Yields Are Rising Together: Five Stabilization Triggers and Three Scenarios

Sat, 16 May 2026 00:00:00 +0000

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The previous piece showed how Iran and the Strait of Hormuz, oil prices, US inflation, Japan’s inflation, the BOJ, US long-term yields, and the global discount rate are all bound together in a single cycle. This piece addresses the next question: when and how can this cycle stabilize?

The US 10-year yield has been approaching 4.6%, and the 30-year has crossed 5%. Japan’s 10-year yield is at its highest since 1997. A simultaneous spike in long-term yields across both countries is not a common event. One can read this as a simple bond-market seizure, or as the beginning of something more structural.

My judgment lies in between. A short-term stabilization is possible. But this is not a market that unwinds on its own. What matters is how many of the following converge simultaneously: Hormuz normalization, oil prices, US inflation, BOJ guidance, and demand at US Treasury auctions.

Key Summary

Current state: US 10-year at 4.46%, 30-year at 5.02%, Japan 10-year at 2.55% (highest since 1997), Japan 30-year near 4.0%.
Decomposing the drivers: This is not simply a product of hawkish Fed commentary. Expected short-term rates, inflation premiums, term premiums, and bond supply premiums have all moved higher simultaneously.
Stabilization potential: Possible, but conditional. The structure does not unwind automatically over time.
Five core triggers: Hormuz normalization and falling oil prices; containment of energy pass-through into US core CPI/PPI; BOJ June meeting guidance; recovery in demand at 10-year and 30-year US Treasury auctions; flight-to-safety flows triggered by risk-asset corrections.
1-to-3-month scenarios: Fast stabilization 20–25%, range-bound consolidation 45–50%, renewed seizure 25–30%.
Single most important variable: Hormuz transit normalization. This one variable touches US inflation and Japan import prices simultaneously.
Investment judgment: It is premature to place a large bet on stabilization in advance. A staged entry after two to three of the five triggers are confirmed is more defensible.

1. Where We Stand Now

Between May 14 and 15, long-term yields moved higher again. The US 10-year yield climbed from 4.46% toward 4.60%, and the 30-year surged from 5.02% to as high as 5.13%. The May 30-year auction saw weak demand, with the stop-through rate coming in higher than market expectations and the tail widening.

Japan followed the same path. The 10-year JGB yield rose into the 2.55%–2.72% range, touching the highest level since 1997. The 30-year JGB approached 4.0%, and the 40-year had already traded as high as 4.24% back in January.

This is not a US-only problem. Long-end yields in Japan, Europe, and the US are all moving together. The global discount rate for risk assets is rising in unison — which explains why Korean equities, US mega-cap tech, KOSDAQ growth names, and long-duration bond ETFs are all under simultaneous pressure.

Why This Is Not a Simple Fed Hawkishness Event

Long-term yields are best understood as the sum of four components.

Component	Current direction	Implication
Expected short-rate path	Higher	Fed rate-cut expectations have faded; BOJ hike probability has risen
Inflation premium	Higher	US CPI, US PPI, and Japan PPI have all re-accelerated simultaneously
Term premium	Higher	The compensation demanded for holding long-duration paper has increased
Bond supply premium	Higher	Weak US auction demand and diminished Japanese marginal buying of Treasuries are compounding

In the US, virtually all Fed rate-cut expectations have evaporated, and markets have even begun pricing a December rate hike. In Japan, the probability of a BOJ June hike has risen above 70%. US April CPI came in at +3.8% year-over-year; Japan April PPI at +4.9%. The NY Fed ACM model puts the US term premium at 0.68% — still below the historical median of 1.47%, but the direction is toward normalization.

Supply-demand dynamics are equally unfavorable. The US must absorb roughly $2 trillion in annual fiscal deficits alongside large Treasury maturities. As BOJ normalization pushes JGB yields higher, the hedged return on US Treasuries for Japanese insurers and pension funds has declined. China, too, is no longer a consistent large buyer of Treasuries.

For yields to stabilize, improving one factor is not sufficient. If oil prices fall but the BOJ remains hawkish, Japan-sourced pressure persists. If the Fed turns more accommodative but auctions keep coming in weak, the long end of the US curve will continue to struggle.

Why the US and Japan Are Moving Together

The first linkage is a common shock. The Hormuz bottleneck and rising oil prices push US CPI and Japan import prices higher at the same time — through gasoline and energy services in the US, and through imported raw materials and corporate goods prices in Japan. This channel is the strongest.

The second linkage is Japanese capital flows. When JGB yields rise, the hedge-adjusted yield on US Treasuries becomes less attractive to Japanese insurers and pension funds. They do not need to sell Treasuries outright. Even a reduction in new purchases weakens the marginal demand for US Treasuries and pushes long-term yields higher.

The third linkage is a global re-pricing of sovereign bond risk. Watching a country like Japan — with an extremely high government debt load — see its 10-year yield move from 2% to 3% territory raises questions about appropriate term premiums for other developed-market sovereigns: the US, Canada, Italy. Markets have started asking those questions again.

Of these three channels, the first — Hormuz and oil prices — is the most powerful. Which is why the central question in this piece ultimately returns to whether Hormuz normalizes.

2. Five Core Triggers

2.1 Hormuz Normalization and Lower Oil Prices

The most powerful trigger is Hormuz normalization. The reason is straightforward: oil prices affect US and Japanese inflation simultaneously.

A substantial portion of the US April CPI print of +3.8% came from energy. Gasoline prices and energy services pushed the headline directly higher. Japan’s exposure is even more direct. The backbone of Japan’s April PPI of +4.9% was import prices rising +17.5%, dominated by energy and raw materials.

If Hormuz transit normalizes and Brent crude stabilizes below $95 for at least one week, the probability that US and Japanese yields ease simultaneously rises meaningfully. Conversely, if Brent re-breaks above $110 and vessel attacks or seizures recur, the long-yield shock can re-intensify.

Category	Stabilization signal	Deterioration signal
Oil price	Brent stable below $95	Re-breaks $110
Hormuz	Vessel traffic recovers to 70%+ of normal	Additional attacks or seizures
Inventories	IEA/EIA draw rate decelerates	Continued draws above 5 mb/day average
War risk insurance	Rates normalize	Vessel war-risk premiums remain at 2–3%
Negotiations	Iran–US talks show progress	Reported collapse of talks

I assess the probability of near-term full normalization at 25–30%. Partial normalization is the most likely outcome at 45–50%, and prolonged disruption sits at 20–25%. In other words, the most realistic picture is not Brent falling quickly into the low $90s, but rather a range-bound environment where further sharp spikes are capped.

2.2 Containment of US CPI/PPI Pass-Through into Core Inflation

The second trigger is US inflation. More important than whether energy prices are high in isolation is whether they pass through into core inflation.

The April headline CPI was +3.8%, with a significant energy contribution. But core CPI also came in at +2.8%, or +0.4% month-over-month. If that monthly pace persists, the annualized rate approaches 5%. In that scenario, even if oil stabilizes, inflationary pressure already transmitted into services, transportation, and shelter will linger.

In the next CPI and PPI releases, what matters more than the headline is core. If core CPI steps down to +0.2%–+0.3% month-over-month and PPI transportation and services decelerate, markets can breathe. Conversely, if core CPI prints +0.4% again and PPI services rise further, Fed rate-cut expectations recede even further.

The key dates: June 11 (US May CPI), June 12 (US May PPI), and June 27 (US May PCE). One deceleration is a signal; two consecutive prints confirm a trend.

2.3 BOJ June Meeting Guidance

The third trigger is the BOJ. Markets already have a substantial probability of a 25bp hike — from 0.75% to 1.00% — at the June meeting priced in. The hike itself is therefore not the critical variable. The critical variable is the tone following the hike.

If the BOJ hikes but characterizes the path as “gradual” and “data-dependent,” markets can take comfort. Even if Governor Ueda leaves the door open to further tightening, a low-implied pace of subsequent hikes would allow both JGBs and US Treasuries to stabilize.

Conversely, if the BOJ strongly validates the path to consecutive hikes, the shock will not remain contained within Japan. JGB yields would push higher, the incentive for Japanese investors to add new positions in US Treasuries would weaken further, and the term premium embedded in the US 10-year would face additional upward pressure.

BOJ message	Market interpretation	Yield impact
Gradual, data-dependent	One hike then a pause	Stabilizing
Justifies further hikes	Consecutive hike path validated	Worsening
Emphasizes yen stability	Reduces import-price pressure expectations	Stabilizing
Emphasizes upside inflation risks	Triggers additional JGB long-end selling	Worsening

A single sentence from the BOJ June meeting can move the US 10-year yield by roughly 10bp. We are in a phase where Japan’s policy dynamics are directly linked to the US Treasury market.

2.4 Recovery in US 10-Year and 30-Year Auction Demand

The fourth trigger is US Treasury auction results. The supply-demand dimension of the long-yield shock is most transparently revealed in auction data.

The May 30-year auction was weak. Bid-to-cover was soft and the tail widened — meaning the clearing yield was higher than the market had anticipated. One weak auction can be treated as an isolated event, but a pattern of weakness reads as a structural demand shortfall.

If the next 10-year and 30-year auctions show a recovering bid-to-cover, a tighter tail, and indirect bidder participation returning above 65%, long-term yields can find a footing. If weak auctions recur, the 30-year sustaining above 5.2% becomes a real possibility.

Key dates to watch: June 10-year and 30-year auctions, and the quarterly Treasury Refunding Announcement on July 30. If the Treasury signals an increase in long-end issuance, the supply burden on long-dated yields grows heavier.

2.5 Risk-Asset Correction Triggering Flight to Safety

The fifth trigger is a paradoxical stabilization path. If long-term yields rise too rapidly, risk assets eventually break. Mortgage rates climb, corporate credit spreads widen, equity multiples compress, and consumption slows. At that point, markets begin repricing growth deceleration and the possibility of eventual Fed easing.

In this case, long-term yields can come down. But it is not a good stabilization. It is a bad equilibrium in which bonds rally only because equities and real estate have sold off.

The stabilization signals here are: an S&P 500 correction of 5–10%, VIX above 25, high-yield spreads widening by at least 50bp, softening consumption and employment data, and an increasing number of Fed officials citing growth concerns. I put the probability of this pathway at 20–30%. It is not, however, a scenario any investor should welcome.

3. One-to-Three-Month Scenarios

The most probable scenario at present is not a fast stabilization but a range-bound consolidation.

Scenario	Probability	Conditions	US 10-Year	Japan 10-Year
A. Fast stabilization	20–25%	Hormuz normalizes, Brent below $95, CPI/PPI decelerate	4.2–4.4%	2.3–2.5%
B. Range-bound consolidation	45–50%	Oil stays elevated but further spikes are capped, BOJ hikes gradually	4.4–4.7%	2.5–2.8%
C. Renewed seizure	25–30%	Brent at $110–$120+, inventory draws persist, BOJ and Fed both turn more hawkish	4.8–5.0%+	Approaching 3.0%

Scenario A requires Hormuz normalization and US disinflation to materialize simultaneously — possible but not high-probability. Scenario C requires oil prices, auction results, and the BOJ to all deteriorate together. The most likely outcome is the middle path: oil remains elevated without spiking further, the US 10-year oscillates between 4.4% and 4.7%, and the Japan 10-year moves in the 2.5%–2.8% range.

Asset-Class Implications

Asset	Fast stabilization	Range-bound	Renewed seizure
US equities	Bullish	Volatility expands	Correction
US mega-cap tech	Bullish	Sideways	Significant correction
Korean KOSPI	Recovery	Sector divergence	Foreign selling
Korean growth stocks	Recovery	Weakness	Significant correction
Korean financials	Sideways	Relative strength	Relative strength
US long-duration bonds	Bullish	Bearish	Significantly bearish
US dollar	Weakness	Sideways to strength	Strength
Gold	Partial profit-taking	Bullish	Bullish
Oil refining/LNG	Weakness	Bullish	Significantly bullish
Defense	Weakness	Bullish	Significantly bullish

4. The Traps in Betting on Stabilization

The first trap is fixating on Fed communication alone. In a conventional market environment, when the Fed turns more dovish, yields fall. But this is not a market driven solely by Fed policy expectations. Inflation premiums, term premiums, bond supply dynamics, and the BOJ are all moving simultaneously. Even if Fed communication improves, the other factors can undercut any rally.

The second trap is treating a Hormuz agreement announcement as the definitive end of the episode. If an agreement is announced, Brent crude and long-term yields could react sharply on the day. But restoring actual vessel traffic, rebuilding inventories, normalizing refined product prices, and eventually seeing core CPI decelerate — all of that takes time. The announcement-day reaction is the first response; the 30-to-60-day verification period determines the true direction.

The third trap is reading this yield surge as nothing more than a short-term convulsion. The short-term geopolitical trigger is real. But simultaneously present are structural factors: US fiscal deficits, term premium normalization, BOJ normalization, and the weakening of Japanese marginal demand for US Treasuries. A return of the 10-year below 4% the way it used to trade is therefore a low-probability scenario. The more realistic target is stabilization in a 4.0%–4.5% range.

5. Practical Monitoring Checklist

The first thing to watch is Brent crude. Brent stable below $95 for at least one week is a stabilization signal. A re-break above $110 is a deterioration signal. Second, watch US core CPI and PPI: month-over-month needs to step down to +0.2%–+0.3%. Third, watch the precise language in the BOJ June statement. “Gradual” and “data-dependent” language is reassuring; any phrasing that validates consecutive hikes is a red flag.

Next, watch the US Treasury auctions. The question is whether demand recovers in the 10-year and 30-year. Finally, watch risk assets themselves. A sharp equity selloff can paradoxically drive a flight to long-duration bonds — but that is not a good scenario.

Priority	Indicator	Stabilization threshold	Deterioration threshold
1	Brent crude	Stable below $95 for 1+ week	Re-breaks $110
2	IEA/EIA weekly inventories	Draw rate decelerates	Draws sustained above 5 mb/day
3	US core CPI/PPI	MoM +0.2–0.3%	+0.4% repeated
4	Fed hike probability	December hike probability below 20%	Above 50%
5	BOJ June guidance	Gradual, data-dependent	Consecutive hikes justified
6	Japan import prices/PPI	Deceleration	Additional surge
7	US 10-year/30-year auctions	Bid-to-cover recovers, tail narrows	Weak auctions repeated
8	USD/JPY	Stable below 155	Re-breaks 160
9	US 30-year yield	Recovers below 5.0%	Settles above 5.2%
10	Japan 30-year yield	Below 3.8%	Settles above 4.0%

Entry Conditions for a Stabilization Bet

Staged entry can be considered when at least three of the following five conditions are met:

Brent crude holds below $95 for at least one week.
The next CPI/PPI release confirms core inflation deceleration.
The BOJ June meeting delivers gradual, data-dependent tightening guidance.
Demand recovers at US 10-year and 30-year Treasury auctions.
The US 10-year fails to sustain above 4.6% and begins to turn lower.

Three or more: first tranche entry is reasonable. Two or fewer: stay in cash. Zero to one: a defensive posture or positioning for further weakness is more rational than betting on stabilization.

6. Implications for the Korean Market

In a fast-stabilization scenario, semiconductors and AI hardware, KOSDAQ growth names, and platform companies are likely to react first. When discount rates fall, long-duration assets are the fastest to rebound.

In the range-bound scenario, the picture is different. Rates do not fall sharply, but they do not worsen either. In this environment, semiconductor components, substrates, test equipment, shipbuilding/LNG, defense, and value/financial stocks hold up better on a relative basis. Sectors with earnings momentum can weather the macro overhang even if it does not fully clear.

In a renewed-seizure scenario, oil refining/LNG, defense, short-duration bonds, and cash equivalents are the defensive plays. KOSDAQ growth stocks and long-duration assets are best avoided.

Scenario	Favorable areas in Korea	Areas to avoid
Fast stabilization	Semiconductors, AI hardware, KOSDAQ growth, platforms	Oil/defense — some profit-taking
Range-bound	Semiconductor components/substrates/test, shipbuilding, defense, financials	Growth stocks without earnings
Renewed seizure	Oil refining, LNG, defense, cash equivalents	KOSDAQ long-duration assets

7. Frequently Asked Questions

Won’t everything resolve once the Fed eventually cuts?

It is not that simple. Even if the Fed cuts short-term rates, long-term yields are shaped by term premiums, bond supply dynamics, foreign buyer behavior, and fiscal deficits. In 2024, there were extended periods when the US 10-year refused to fall materially despite active Fed rate-cut expectations. Monitoring only Fed communication is insufficient this cycle as well.

If Japan dumps Treasuries, doesn’t that cause a collapse?

What matters more than outright selling is the deterioration of marginal demand. Japanese insurers and pension funds do not need to actively sell US Treasuries. Simply reducing new purchases weakens the marginal demand balance in the Treasury market. That is the quieter but more structurally significant risk.

Isn’t this a buying opportunity in long-duration bonds?

With yields elevated, the expected return on long-duration bonds has improved. But entry timing still matters. If the US 10-year climbs further from 4.6% to 4.8%, long-bond prices will experience additional drawdowns. Full allocation is therefore inferior to trigger-based staged entry: consider a first tranche when three of the five triggers are met, a second tranche at four, and complete the allocation if all five confirm.

8. One Final Thought

US 10-year at 4.46%, 30-year at 5.02%, Japan 10-year at the highest level since 1997. This is not a simple Fed hawkishness event. It is the result of expected short-term rates, inflation premiums, term premiums, and bond supply premiums all moving higher simultaneously. Improvement in a single factor will not produce stabilization.

The single most powerful variable is Hormuz and oil prices. They are the common shock that simultaneously determines US inflation and Japan’s import prices. The negotiation outcome in late May to early June is the first potential inflection point.

At this juncture, scenario probabilities stand as follows: fast stabilization 20–25%, range-bound consolidation 45–50%, renewed seizure 25–30%. The most probable outcome is the middle path. Rather than betting on a return of the 10-year below 4%, the more realistic target is stabilization in a 4.0%–4.5% range.

It is too early to bet heavily on stabilization. Staged entry after at least three of the five triggers — Hormuz, CPI/PPI, BOJ guidance, US Treasury auctions, risk-asset correction — are confirmed is the more defensible approach. The most dangerous assumption is that time alone will resolve this cycle. This episode contains not only a short-term geopolitical convulsion but also structural elements: fiscal dominance and term premium normalization.

This may not be a market returning to low rates, but rather one in which — at a higher discount rate — the gap between strong assets and weak assets widens. In that environment, the true alpha does not come from simply betting that rates fall. It comes from identifying assets with the earnings and cash flows to hold their ground even when rates stubbornly refuse to decline.

This post is for research and commentary purposes only and does not constitute investment advice. US April CPI/PPI figures are based on official BLS releases. Japan April PPI is based on the BOJ Monthly Report. US 10-year/30-year yields and JGB 10-year/30-year yields reflect market data from May 14–15. Scenario probabilities (fast stabilization 20–25%, range-bound 45–50%, renewed seizure 25–30%) represent the analyst’s subjective estimates and may differ materially from actual market outcomes. Term premium estimates (US ACM 0.68%, historical median 1.47%) are based on NY Fed publications. CME FedWatch December 25bp hike probability (36%) is as of May 15 and changes daily. BOJ June hike probability of 77% reflects market consensus per Reuters and Bloomberg. The timing of Hormuz normalization, BOJ guidance, and US CPI deceleration remain uncertain. The global macro environment can shift rapidly in response to unexpected events, including additional geopolitical conflicts or policy changes. Data reference date: May 16, 2026 KST.

Disclaimer: For research and information purposes only. Not investment advice. Names cited are for analytical illustration; readers should perform their own due diligence and consult licensed advisors before any investment decision.

JGB on Korea Invest Insights