Three brokerages and a clearing firm have signed a letter of intent to build an electronic communications network.

Fidelity Investments, Donaldson, Lufkin & Jenrette, and Charles Schwab Corp. will use technology from Spear, Leeds & Kellogg, a market maker and major clearing firm, to create the industry's 10th ECN, a new breed of network that is rapidly changing securities trading.

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