Not that most here are going to be all that excited about the yields, but the Vanguard Treasury MM fund with its .09% ER has long been far-and-away the best Treasury MM fund available from any major brokerage.
Historically the 50K minimum investment and somewhat frequent closings of the fund to new investors during market meltdowns have been obstacles. At least the first of these is now gone:
https://advisors.vanguard.com/pub/Pdf/sp11.pdf
For those who subscribe to the old Will Rogers saw ("I'm more concerned with the return OF my principal than the return ON it") VUSXX is about as good as it gets.
Historically the 50K minimum investment and somewhat frequent closings of the fund to new investors during market meltdowns have been obstacles. At least the first of these is now gone:
https://advisors.vanguard.com/pub/Pdf/sp11.pdf
For those who subscribe to the old Will Rogers saw ("I'm more concerned with the return OF my principal than the return ON it") VUSXX is about as good as it gets.