The U.S. Securities and Exchange Commission published its latest monthly "Money Market Fund Statistics" summary Tuesday. The report shows that total money fund assets rose by $125.0 billion in December 2025 to a record high $8.180 trillion, after hitting $8.055 trillion the month prior. The SEC shows Prime MMFs increased $1.2 billion in December to $1.342 trillion, Govt & Treasury funds increased $117.3 billion to $6.680 trillion and Tax Exempt funds increased $6.6 billion to $157.9 billion. Taxable yields were lower again in December following declines in November. The SEC's Division of Investment Management summarizes monthly Form N-MFP data and includes asset totals and averages for yields, liquidity levels, WAMs, WALs, holdings, and other money market fund trends. We review their latest numbers below. (Our MFI XLS monthly shows money fund assets increasing $129.2 billion in December 2025 to a record of $8.121 trillion. In January month-to-date through 1/20, total money fund assets have decreased by $9.2 billion to $8.100 trillion, according to Crane Data's separate, and slightly smaller, MFI Daily series.)
December's asset increase follows an increase of $125.1 billion in November, $153.2 billion in October, $106.0 billion in September, $138.0 billion in August, $60.2 billion in July, $4.3 billion in June, $94.9 billion in May, a decrease of $17.5 billion in April, a rise of $2.8 billion in March, $101.8 billion in February, $47.9 billion in January and $113.1 billion last December. Over the 12 months through 12/31/25, total MMF assets have increased by $941.7 billion, or 13.0%, according to the SEC's series.
The SEC's stats show that of the $8.180 trillion in assets, $1.342 trillion was in Prime funds, up $1.2 billion in December. Prime assets were up $3.1 billion in November, $9.1 billion in October, $6.2 billion in September, $20.2 billion in August, $22.7 billion in July, $9.8 billion in June, $11.8 billion in May, $2.3 billion in April, $22.1 billion in March, $15.5 billion in February and $27.3 billion in January and $4.0 billion last December. Prime funds represented 16.4% of total assets at the end of December. They've increased by $151.3 billion, or 12.7%, over the past 12 months. (Note that the SEC's series includes a number of internal money funds not tracked by ICI, though Crane Data includes most of these assets in its collections.)
Government & Treasury funds totaled $6.680 trillion, or 81.7% of assets. They increased $117.3 billion in December, increased $115.4 billion in November, increased $142.1 billion in October, increased $97.8 billion in September, increased $118.1 billion in August, increased $39.0 billion in July, decreased $0.7 billion in June, increased $82.7 billion in May, decreased $25.1 billion in April, $21.8 billion in March, increased $85.5 billion in February, $23.2 billion in January and $109.4 billion last December. Govt & Treasury MMFs are up $773.5 billion over 12 months, or 13.1%. Tax Exempt Funds increased $6.6 billion to $157.9 billion, or 1.9% of all assets. The number of money funds was 283 in December, up 2 from the previous month and up 7 funds from a year earlier.
Yields for Taxable MMFs were lower in December, while Tax Exempt MMFs yields were higher. The Weighted Average Gross 7-Day Yield for Prime Institutional Funds on December 31 was 3.91%, down 20 bps from the prior month. The Weighted Average Gross 7-Day Yield for Prime Retail MMFs was 3.93%, down 20 bps from the previous month. Gross yields were 3.83% for Government Funds, down 20 bps from last month. Gross yields for Treasury Funds were down 18 bps at 3.82%. Gross Yields for Tax Exempt Institutional MMFs were up 20 basis points to 3.09% in December. Gross Yields for Tax Exempt Retail funds were up 26 bps to 3.06%.
The Weighted Average 7-Day Net Yield for Prime Institutional MMFs was 3.80%, down 21 bps from the previous month and down 68 bps from 12/31/24. The Average Net Yield for Prime Retail Funds was 3.67%, down 20 bps from the previous month and down 68 bps since 12/31/24. Net yields were 3.61% for Government Funds, down 20 bps from last month. Net yields for Treasury Funds were down 18 bps from the previous month at 3.61%. Net Yields for Tax Exempt Institutional MMFs were up 21 bps from November to 2.99%. Net Yields for Tax Exempt Retail funds were up 25 bps at 2.83% in December. (Note: These averages are asset-weighted.)
WALs and WAMs were mixed in December. The average Weighted Average Life, or WAL, was 52.5 days (down 0.7 days) for Prime Institutional funds, and 48.3 days for Prime Retail funds (down 1.9 days). Government fund WALs averaged 88.6 days (down 0.5 days) while Treasury fund WALs averaged 95.1 days (up 0.3 days). Tax Exempt Institutional fund WALs were 5.0 days (unchanged), and Tax Exempt Retail MMF WALs averaged 30.6 days (down 1.6 days).
The Weighted Average Maturity, or WAM, was 28.1 days (down 0.2 days from the previous month) for Prime Institutional funds, 30.7 days (down 0.8 days from the previous month) for Prime Retail funds, 39.1 days (up 1.0 days from previous month) for Government funds, and 46.2 days (up 1.3 days from previous month) for Treasury funds. Tax Exempt Inst WAMs were down 0.2 days at 4.8 days, while Tax Exempt Retail WAMs were down 1.7 days from previous month at 29.7 days.
Total Daily Liquid Assets for Prime Institutional funds were 53.1% in December (down 2.2% from the previous month), and DLA for Prime Retail funds was 47.2% (down 2.3% from previous month) as a percent of total assets. The average DLA was 65.1% for Govt MMFs and 94.8% for Treasury MMFs. Total Weekly Liquid Assets was 65.0% (down 1.7% from the previous month) for Prime Institutional MMFs, and 60.4% (down 1.3% from the previous month) for Prime Retail funds. Average WLA was 79.8% for Govt MMFs and 98.9% for Treasury MMFs.
Note that the SEC made a number of changes to their monthly release in April 2025, so we're no longer publishing a number of tables. A press release titled, "SEC Publishes New Data and Analysis About Registered Investment Companies and Money Market Funds," states, "The Securities and Exchange Commission ... published new data and analysis in a pair of reports that provide the investing public with updated key information about registered investment companies and money market funds. 'It is important that the Commission publicly shares the information it collects in a clear and transparent way,' says Acting Chairman Mark Uyeda. 'These two reports will provide the public with key information about the approximately $41.5 trillion investors trust to funds and the approximately $7.39 trillion invested in money market funds.'"
The SEC says, "Money Market Fund Statistics is an enhanced version of the money market funds report generated by the Division of Investment Management. This report contains additional statistical analysis and enhancements, as well as certain metrics based on Form N-MFP data. The modifications to the report are designed to further facilitate the public's ability to efficiently review, digest, and use aggregate information about the money market fund industry by including summaries of more money market fund data, including information about internal affiliated funds, portfolio investments, flows, and industry concentration. The report extends the downloadable historical statistical series of data back to 2010."
Tim Husson, who leads the SEC's Division of Investment Management's Analytics Office, adds, "Forms N-MFP and N-CEN provide insights into key areas of the investment company industry. The reports reflect our continued dedication to enhance the public's use of important information about the industry."
