Between late April and late May 2026, US Treasuries sold off sharply as a US-Iran conflict-driven oil supply shock pushed inflation expectations to multi-month highs, the Fed turned hawkish under Powell, and structural changes in buyer composition removed a reliable yield ceiling. The 30-year yield breached 5% for the first time since 2007 while the bearish case increasingly dominated.
Oil-driven demand destruction, month-end rebalancing, and a Warsh-era rate-cut pivot offer plausible but conditional relief for duration.
The bullish case for Treasuries during this period rested on two conditional but plausible scenarios, both tied to the resolution of energy-price volatility. A Manulife portfolio manager argued that either a de-escalation reducing oil prices or a prolonged conflict causing demand destruction would both ultimately be supportive of Treasuries [1]. That framing captures the asymmetric optionality bulls were pointing to: the geopolitical trigger that drove the selloff could, under either resolution path, eventually reverse it.
More near-term technical support came from month-end dynamics. Index rebalancing flows — driven by April's relative underperformance of equities versus bonds — were expected by market participants to generate mechanical buying pressure from portfolio managers and index funds. On April 30, a pullback in oil prices from four-year highs did produce an intraday rally, with yields falling two to six basis points at midday, providing a concrete if transient illustration of the oil-Treasury linkage.
Looking further out, the anticipated leadership transition to Kevin Warsh at the Federal Reserve offered bulls a structural argument. Wall Street strategists expected a Warsh-led Fed to push front-end yields lower, reviving the curve steepener trade and supporting bond prices at the short end [2]. One fixed income strategist projected that expectations for lower rates under Warsh could push bond yields in G7 countries down by 30 to 50 basis points [3]. These projections remain forward-looking and contingent on the pace and credibility of a Warsh pivot, but they represent a meaningful medium-term counterweight to the prevailing bearish momentum.
Competing forces — sticky inflation, a cautious Fed, and geopolitical uncertainty — left the 10-year rangebound near 4.3% before the breakout, with direction unresolved.
Through most of late April, the 10-year Treasury yield had barely strayed from 4.3% for the month, with BMO Capital Markets' head of US rates strategy Ian Lyngen noting that Bollinger Bands had compressed to their narrowest since January 16 — a dynamic he characterized as implying "a coiling that will eventually resolve in a sharp repricing" [4]. That technical setup framed the neutral period as a state of suspended tension rather than equilibrium, with the eventual direction uncertain.
The Federal Reserve's posture reinforced that ambiguity. The Fed was widely expected to hold rates steady at its April/May meeting, with market participants characterizing Powell as deliberately buying time given a strong economy and above-target inflation, and as trying to avoid "shocking the markets and creating an inadvertent tightening of financial conditions" [5]. That cautious optionality — neither easing nor tightening — was consistent with a rangebound yield environment.
The macro data released on April 30 validated neither the bull nor bear case with conviction. GDP growth of 2.0% came in below the 2.3% consensus while PCE inflation of 3.5% printed in line with forecasts, a combination that, as one market participant observed, was "mixed but probably validates the Fed's stance" of a hawkish lean without delivering a decisive catalyst [6]. A PGIM strategist further noted that shorter-maturity Treasuries faced genuinely uncertain risks depending on how the Iran conflict fed through to economic data, reflecting the balanced upside and downside scenarios that defined the neutral window [7].
The 30-year yield above 5%, structural demand deterioration, and energy-driven inflation persistence have removed the ceiling, raising the question of what stops yields from rising further.
The bearish case became the dominant narrative by mid-May and rested on three reinforcing pillars: an energy-driven inflation shock, a hawkish Fed pivot, and structural deterioration in Treasury demand. The US attack on Iran and the resulting Strait of Hormuz supply disruption drove oil prices sharply higher, and as one strategist observed, "rising energy prices continue to set the agenda for the direction of US rates" [8]. Market-implied inflation expectations, measured by the five-year CPI swap rate, topped 2.7% for the first time since August 2025 — a level likely to keep the Fed cautious about cutting [9].
The Fed's April/May meeting under Powell produced a hawkish outcome [10]. The 10-year Treasury yield subsequently surged to 4.671%, its highest level since January 2025, while the 30-year yield rose above 5% for the first time since 2007, touching 5.178% [11]. A BNP Paribas rates strategist articulated the resulting loss of anchor directly: "Now that we have no anchor, what stops bond yields from going up in a world of high inflation, ever-rising deficits, and global bond yield pressure?" [12]. That question had no ready answer given the prevailing macro backdrop.
Compounding the directional pressure was a structural shift in who holds Treasuries. According to analysis cited in reporting, the buyer composition has shifted away from stable sovereign holders such as China toward price-sensitive hedge funds concentrated in financial hubs including the UK, Belgium, and the Cayman Islands. As that analysis noted, "this shift means that higher yields don't automatically bring in buyers the way they once did" — investors have become more cautious and selective, which "can allow yields to rise further before demand picks up" [13]. That structural change undermines the traditional stabilizing mechanism and reinforces the bearish view that the selloff may have further to run.