J.P. Morgan & Co. said Thursday that it had agreed to acquire a 20% interest in Archipelago, one of a new breed of networks that is bringing rapid change to securities trading processes.

The dollar amount to be invested in Archipelago Holdings LLC of Chicago was not disclosed. The Morgan investment would follow similar ones by Goldman Sachs Group and E-Trade Group, indicating the high level of interest in such electronic communications networks, or ECNs, from the investment banking community.

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