The number of open-end funds worldwide reached 118,978 in 2018. Almost half of the global mutual fund assets were concentrated in the United States. The largest fund management companies worldwide as of June 2019 were Blackrock, Vanguard Asset Management, Vanguard Asset Management and State Street Global Advisors.
In the United States, there were 9,599 mutual funds in 2018, managing assets worth approximately 17.71 trillion U.S. dollars. Domestic equity funds constituted 41 percent of the fund market in the United States in 2018. The second most popular were bond funds, with 22 percent of the market share. In 2018, 44.8 percent of American households owned mutual funds, and this figure has not changed significantly since 2000. The families entrusted on average 21 percent of their financial assets to investment companies.
Costs constitute an important aspect of the mutual fund industry as they influence the value of an investor’s return. The expense ratio of equity mutual funds in the United States varied noticeably depending on the fund management style. In the case of actively managed equity funds it was equal to 0.76 percent in 2018, while for the passively managed equity funds the expense ratio amounted to only 0.08 percent.