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Municipal Bond Yields Rise Amid Inflation Concerns

By Markets Desk · 2026-09-10 · 2 min read
A stack of government bond certificates on a desk
Illustration: Tradingbird

Municipal bond yields increased by up to nine basis points on Wednesday as investors priced in higher interest rates. The 30-year MMD-UST ratio hit 91%, a new year-to-date high, reflecting widening spreads against Treasuries.

Municipal bond yields climbed by five to nine basis points across the curve on Wednesday. This move followed a decline in U.S. Treasury prices and a drop in equity markets. The 10-year MMD-UST ratio reached 74%, while the 30-year ratio hit 91%. Both figures represent the highest levels recorded so far this year. U.S. Treasuries also yielded higher, with two-, three-, five-, and 10-year notes reaching their peak levels of the year.

Market participants are reacting to renewed inflation concerns. Federal Reserve Chair Kevin Warsh recently emphasized the central bank's commitment to lowering inflation. This stance has increased the perceived probability of future rate hikes. Kevin McGuigan, Director of Municipal Market Analytics, noted that this shift is impacting investor sentiment. The market is now closely watching the upcoming Consumer Price Index report for further clarity. That data could solidify expectations regarding the direction of monetary policy.

Supply Increases Amid Negative Fund Flows

Issuers are increasing their borrowing activity despite the challenging environment. The week's new issuance calendar has grown from $15 billion to $17 billion. This is a significant jump compared to the same week last year, when issuers priced only $7.7 billion. McGuigan attributes this to issuers acting ahead of potentially higher rates. The market is also facing technical headwinds that limit its resilience compared to Treasuries. Secondary supply levels were notably high on Tuesday, adding further pressure on prices.

Investment Company Institute data shows a sharp drop in fund flows. Outflows reached $947 million for the week ending September 2. This marks the largest outflow since mid-January. The previous week saw inflows of $754 million. LSEG reported a different figure, showing inflows of $137.9 million for the same period. Exchange-traded funds saw inflows of $705 million, down from $1.729 billion the week prior. These mixed signals highlight the complexity of current investor behavior.

Major Issuers Price New Debt Tranches

New York City priced $1.36 billion in general obligation bonds on Wednesday. The first tranche included bonds maturing in 2028 at 2.92% and 2041 at 4.52%. The second tranche saw similar yields, with 2028 bonds at 2.92% and 2038 bonds at 4.21%. Fort Worth also issued $497.12 million in venue project bonds. Yields ranged from 2.89% for 2027 maturities to 5.23% for 2056 maturities. These prices reflect the current market demand for credit quality.

Minnesota sold $1.03 billion in general obligation bonds across five series. The first series included bonds maturing in 2027 at 2.60% and 2036 at 3.67%. The third series, focused on state trunk highways, offered bonds maturing in 2046 at 4.69%. All tranches were sold to major banks including Wells Fargo and J.P. Morgan. The successful pricing indicates continued demand for high-rated state debt. However, the yields suggest that the cost of borrowing has risen for municipal issuers.

Inflation Data Will Guide Future Moves

The municipal market remains sensitive to broader economic indicators. The upcoming Consumer Price Index report is the key event to watch. This data will help clarify the path of Federal Reserve policy. If inflation proves sticky, expectations for higher rates may persist. This could lead to further yield increases in the municipal market. Investors are positioning themselves ahead of the release to manage risk. The current environment requires careful navigation of both inflation and rate risks.

Based on reporting by GN markets/inflation (en-US), compiled by the Tradingbird desk.

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