Merrill Edge joined lots of other brokerages last autumn in moving customers' settlement (core) accounts into low paying (though FDIC-insured) bank accounts. Current yield is 0.14% (up to $250K).
https://advisorhub.com/merrill-to-shift-client-cash-into-bofa-accounts-and-away-from-cash/Here's a column (Feb 19, 2019) giving options for cash in these accounts. There are some MMFs you can buy that pay a passable rate of interest, though well under 2%. (Fidelity's default SPAXX currently yields 2.05%.)
https://www.mymoneyblog.com/merrill-edge-brokerage-cash-sweep-options.htmlTwo items of note in that column:
There's a 2.07% bank account you can get into if you bootstrap it with $100K (you can reduce the amount once opened);
The same $100K will get you into some institutional MMFs.
A couple of those funds actually have fluctuating NAVs, i.e. are real, institutional, non-government MMFs. A prime fund (currently yielding 2.54%) and a muni fund.
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https://olui2.fs.ml.com/Publish/Content/application/pdf/GWMOL/ICCRateSheet.pdf