Even if the Nasdaq Stock Market extends trading into the evening hours, mutual fund companies will probably continue to price their portfolios at 4 p.m., at least at the outset, predicted a spokesperson from the Investment Company Institute (ICI), the mutual fund industry's major trade organization, based in Washington, D.C.

The current practice of funds calculating their net asset values (NAVs) based on the 4 p.m. closing prices of the Nasdaq and New York Stock exchanges will probably continue because Nasdaq's proposal includes a break from 4 p.m. to 5:30 p.m., said Chris Wloszczyna, the ICI spokesperson.

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