The highest-yielding Vanguard money market fund right now is the Vanguard Treasury Money Market Fund (VUSXX). Based on Vanguard’s data as of July 11, 2025, its 7-day SEC yield is approximately 4.18% slightly ahead of the Federal fund (around 4.23% 30-day) and ahead of municipal or state-specific funds, which yield less (typically 2–3%) .
Why Treasury fund leads:
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Invests only in U.S. Treasury securities, which currently pay higher short-term rates.
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Held highest recent yields compared to other Vanguard cash equivalents .
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Expense ratio is just 0.07%, the lowest among Vanguard money market options .
