First Security Van Kasper of San Francisco said Monday that it had agreed to buy a small privately owned Portland, Ore., broker-dealer, Black & Co., for an undisclosed price.

The buyer is a division of Salt Lake City-based First Security Corp., which neighboring Zions Bancorp. is to acquire this quarter for $5.9 billion. First Security bought the Van Kasper investment bank a year ago for $100 million, gaining an equity underwriting capability and a significant private-client business. First Security Van Kasper has eight offices in California and one in Phoenix.

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