Notes. Tax-exempt money fund The fund invests primarily in obligations of state and local jurisdictions ("municipal securities") generally exempt from US Federal Income Tax (and to some extent state income taxes). Institutional money fund Institutional money funds are high minimum investment, low expense share classes that are marketed to corporations, governments, or fiduciaries. They are often set up so that money is swept to them overnight from a company's main operating accounts. Large national chains often have many accounts with banks all across the country, but electronically pull a majority of funds on deposit with them to a concentrated money market fund. Retail money fund Retail money funds are offered primarily to individuals. Retail money market funds hold roughly 33% of all money market fund assets. Fund yields are typically somewhat higher than bank savings accounts, but of course these are different products with differing risks (e.g., money fund accounts are not insured and are not deposit accounts). Since Retail funds generally have higher servicing needs and thus expenses than Institutional funds, their yields are generally lower than Institutional funds. SEC rule amendments released July 24, 2014, have 'improved' the definition of a Retail money fund to be one that has policies and procedures reasonably designed to limit its shareholders to natural persons. Money fund sizes Recent total net assets for the US Fund industry are as follows: total net assets $2.6 trillion: $1.4 trillion in Prime money funds, $907 billion in Treasury money funds, $257 billion in Tax-exempt. Total Institutional assets outweigh Retail by roughly 2:1. The largest institutional money fund is the JPMorgan Prime Money Market Fund, with over US$100 billion in assets. Among the largest companies offering institutional money funds are BlackRock, Western Asset, Federated Investors, Bank of America, Dreyfus, AIM and Evergreen (Wachovia). The largest money market mutual fund is Vanguard Federal Money Market Fund (Nasdaq:VMFXX), with assets exceeding US$120 billion. The largest retail money fund providers include: Fidelity, Vanguard, and Schwab. Similar investments Money market accounts Banks in the United States offer savings and money market deposit accounts, but these should not be confused with money mutual funds. These bank accounts offer higher yields than traditional passbook savings accounts, but often with higher minimum balance requirements and limited transactions. A money market account may refer to a money market mutual fund, a bank money market deposit account (MMDA) or a brokerage sweep free credit balance.