Payment Systems Inc., a Tampa-based market research firm, has acquired Spectrem Group Inc., a privately held trust and investment products consultancy.

The deal, announced Friday, allows for San Francisco-based Spectrem to continue operating as a separate company under its founder and chairman, Amy J. Errett.

Spectrem's consultants will now use Payment Systems' research on the affluent and retirement services markets to customize reports for their clients, the company said.

Payment Systems, a subsidiary of NFO Research Inc., employs more than 75 professionals. The company did not disclose how much it paid for Spectrem, which had annual revenues of $4 million last year.

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