Although Montgomery Asset Management of San Francisco recently joined two web-based fund start-ups in the unusual practice of revealing individual stock holdings instantaneously or with a slight delay, other established mutual fund companies are not likely to do the same, said fund executives.

Fund companies are more likely to stick to the SEC requirements that they reveal their holdings only two times a year, fund executives said. At most, they are likely to reveal their top 10 holdings, perhaps on a quarterly basis, the executives said. To reveal holdings more frequently is time-consuming and may prompt shareholders to abandon a fund in favor of individual stocks, executives said.

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