Vanguard will be merging the $6.7 billion Vanguard Treasury Money Market Fund into the $21.8 billion Vanguard Admiral Treasury Money Market Fund in August, and it has already closed the Vanguard Federal Money Market Fund to new accounts and additional purchases.

“Taking these preventative measures will protect fund shareholders and will help ensure that the yields of the funds remain competitive,” said Bill McNabb, chief executive officer of Vanguard. “It is quite possible that yields on government-backed securities, and consequently the Vanguard funds, will remain quite low for the foreseeable future. Shareholders may wish to consider switching to alternative Vanguard fund options that are consistent with their goals and risk tolerance.”

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