BankAmerica Corp. and NationsBank Corp. each said Wednesday that they have completed acquisitions of securities firms.

San Francisco-based BankAmerica, which announced its $540 million deal for Robertson Stephens & Co. in June, said it will operate BancAmerica Robertson Stephens as its section 20 securities unit.

Sandy Robertson, co-founder of San Francisco-based Robertson Stephens, will join BankAmerica's board of directors.

Charlotte, N.C.-based NationsBank, which announced its $1.2 billion deal for Montgomery Securities in June, has renamed its section 20 subsidiary NationsBanc Montgomery Securities Inc.

Thomas W. Weisel, chief executive of San Francisco-based Montgomery, was named chairman of NationsBanc Montgomery Securities.

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