
The iShares Prime Money Market ETF strives to generate strong current income, always balancing this goal with the critical needs for investment liquidity and the steadfast preservation of principal.
Is PMMF's expense ratio expensive, average, or a steal for its category?
Pro reveals the verdict on a 5-tier spectrum calibrated against ICI 2025 industry averages, with strategy-aware bands so the comparison is meaningful.

The iShares Prime Money Market ETF offers exposure to a broad mix of cash products, including repos, CDs, and commercial paper. PMMF operates under Rule 2a-7, aiming to maintain NAV stability and mitigate 'break-the-buck' risk during market stress. The fund's prime money market status allows for non-government security exposure, resulting in varied liquidity profiles across holdings.

iShares Prime Money Market ETF offers intraday liquidity and regulatory protections under SEC Rule 2a-7, enhancing traditional money market fund structures. PMMF currently emphasizes repos and CDs, maintaining a short 40-day weighted average maturity and a 3.7% SEC yield with weekly distributions. PMMF has consistently outperformed both T-Bill ETFs and large mutual fund money market peers, delivering small but reliable alpha within a tightly regulated framework.

As the hunt for yield and stability remains a cornerstone of portfolios in 2026, a group of iShares short-term bond ETFs have made a strategic move to the Big Board today. Four prominent short-term fixed-income vehicles have officially transitioned their primary listing to the New York Stock Exchange (NYSE).

The iShares Prime Money Market ETF (PMMF) eliminates duration risk amid growth rebound considerations and inflation still running hot. However, a growth rebound also makes some credit risk more appealing at the moment at low durations, provided by FLOT which also has a very low duration. Expense ratios are also lower on effectively similar low duration alternatives.

Multiple factors, including questions around interest rates, persistent inflationary pressures, and global volatility, are shaping the fixed income landscape in 2025. As investors seek ways to navigate uncertainty and maintain liquidity during periods of market stress, several key product launches have emerged in fixed income.