Fidelity Investments, the nation’s biggest mutual fund company, said Friday that its sector funds will no longer carry a 3% front-end sales charge.

The Boston-based firm will eliminate the standard fee on its Select Portfolios, which track individual industries, making its entire retail fund lineup of 173 funds available on a no-load basis. The front-end load was lifted at the close of trading on Monday. While its sector funds are among the smallest of its portfolios, they make up $18.3 billion of its $1.6 trillion in total assets under management.

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