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.
PMMF is a newly launched ETF designed to offer intra-day trading liquidity for money market fund-like investments, adhering to SEC Rule 2a-7. This distinguishes it from traditional money market funds that operate with end-of-day NAV calculations. While aiming for high current income with liquidity and principal stability, PMMF's holdings, which include bank deposits and tri-party repos, introduce some counterparty credit risk, unlike pure T-Bill ETFs.