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Are mutual funds safe from defaults?
There are very strict regulations that requires the assets which a fund buys on behalf of its investors to be kept completely separate from the fund's own assets (which it uses to pay its expenses), except for the published fees. Funds are typically audited regularly to ensure this is the case. So the only way in which a default of the fund could cause a loss of invstor money would be if the fund managers broke the regulations and committed various crimes. I've never heard of this actually happening to a normal mutual fund. There is of course also a default risk when a fund buys bonds or other non-equity securities, and this may sometimes be non-obvious. For example, some ETFs which are nominally based on a stock index don't actually buy stocks; instead they buy or sell options on those stocks, which involves a counterparty risk. The ETF may or may not have rules that limit the exposure to any one counterparty.