Money market mutual funds assets increased 0.42%, to $765.2 billion, for the week ended Dec. 6, the Investment Company Institute reported.

The gain was fueled by inflows into retail funds that more than offset losses in institutional portfolios.

Retail assets increased $4.68 billion, ending the week at $537.38 billion. Taxable retail funds rose $3.27 billion, to $433.9 million. Tax- free funds gained $1.41 billion, reaching $103.48 billion.

Institutional money funds lost $1.46 billion in assets, ending the week at $227.82 billion. Taxable institutional accounts fell $2.57 billion to $202.24 million, while tax-free accounts grew $1.10 billion, to $25.58 billion.

The investment institute, based in Washington, tracks the assets of more than 970 money market funds on a weekly basis.

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