Concerns over persistent inflation have sent a prominent BlackRock Inc. exchange-traded fund focused on longer-dated US Treasuries to its lowest point since 2004. The fund's decline reflects the broader struggles within fixed-income markets as investors grapple with the economic outlook.

The iShares 20+ Year Treasury Bond ETF (ticker: TLT), which tracks long-term government debt, has experienced a significant downturn. This slump is attributed to the Federal Reserve's aggressive interest rate hikes aimed at curbing inflation. As interest rates rise, the value of existing bonds with lower coupon payments decreases, particularly those with longer maturities.

Analysts suggest that the 'widow maker' moniker, often applied to such volatile assets, is fitting given the fund's sharp descent. The ETF's performance underscores the challenges faced by investors holding long-duration fixed-income securities in the current economic environment, where the path of inflation and future monetary policy remain uncertain. BlackRock's fund has been a popular choice for investors seeking exposure to long-term Treasuries, but its recent performance highlights the risks involved.