A number of leading fund companies, Fidelity Investments of Boston and Charles Schwab & Co. of San Francisco included, are resisting a proposal that would require them to make a fund's monthly performance available to investors by the third day after the month.

The Securities and Exchange Commission has proposed new advertising rules that include a provision requiring a fund that includes performance figures in its advertisements to also list a toll-free or collect phone number where investors can obtain the latest month's data. Funds must be able to quote the previous month's performance within three days.

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