Jessica Lerner

"Folloing recent yield moves, a generic muni index is now down 1% on the month with no real sub-sector showing much deviation from that result," said Kim Olsan, senior vice president of trading at FHN Financial.

Despite higher yields, muni to UST ratios remain rich. Ratios look "progressively richer" moving into the five- to 10-year part on the curve, with the 10-year spot "still far more attractive in taxables versus tax-exempts," J.P. Morgan said.

"April has been one of the worst-performing months over the past five years, which we believe warrants continued caution," BlackRock strategists said.

The firm said Saporito's hiring is among several other additions made to beef up Wells Fargo's commitment to munis.

April continues to be "harsh" for munis as the asset class has given up roughly 72 basis points in the first two weeks of the month, said Jason Wong, vice president of municipals at AmeriVet Securities.

The top two municipal bond insurers wrapped $7.132 billion in the first quarter of 2024, up from the $5.735 billion of deals in the first quarter of 2023, according to LSEG data.

Municipal bond mutual funds saw the seventh consecutive week of inflows and the 14th week of inflows for high-yield funds.

The new hire comes on the heels of the firm's growth in bond insurance in the first quarter of 2024.

The pace of the issuance and the increase of refundings, surging 59.6% in the first quarter of 2024, have also led some firms to up their overall 2024 issuance projections.

"The news is sparking an equity market selloff while sending bond yields to the stars as investors dial down their Fed easing expectations again, this time to only two rate cuts this year," said José Torres, senior economist at Interactive Brokers.

Wednesday's CPI report will "shed more light on the path of inflation and the potential timing for rate cuts this year," said Cooper Howard, a fixed income strategist at Charles Schwab.

Muni to UST ratios also continue to rise across the curve, inching closer to more normal averages.

Some buying returned to the market Thursday from the buy-side and asset managers as dealers attempted to sell bonds, said Chris Brigati, senior vice president and director of strategic planning and fixed income research at SWBC.

Two mega deals recently priced with make-whole calls for bonds due in 2034 and shorter where the market does not appear "to be penalizing issuers for including an optional make whole call feature in the short maturity tax-exempt bonds," said Pat Luby, head of Municipal Strategy at CreditSights, in a report.

"Most spots on the muni AAA HG curve are at or near year-to-date highs, and the muni HG curve showed significant underperformance across the curve in March, relative to the broader fixed income market, after sizable muni outperformance in February," said J.P. Morgan strategists.

Before Tuesday's selloff, muni yields have been rising over the last several weeks due to "outsized" new-issue supply, said Anders S. Persson, Nuveen's chief investment officer for global fixed income, and Daniel J. Close, Nuveen's head of municipals.

The uptick in supply amid tax season has led to a short-end correction and higher muni to UST short ratios, but the levels are still rather rich from a historical perspective.

March issuance came in at $36.405 billion, above the $34.579 billion 10-year average, according to LSEG Refinitiv data. 

LSEG Lipper reported fund inflows of $447 million while high-yield muni bond funds saw another round of inflows at $246 million, marking the 12th consecutive week of positive flows in that space.

Most of the selling during tax season happens on the front end of the curve, said Wesly Pate, senior portfolio manager at Income Research + Management.