A small Boston advisory firm is poised to expand from New England to the Middle Atlantic states and beyond because its executives believe the richest Americans want alternatives to the money-center banks.

"I think many of the clients we hope to attract — the ultra-high-net-worth and families of very significant wealth — are really taking a step back after the last 12 months," Stephen Prostano, the president and chief operating officer of Silver Bridge Advisors, said in an interview last week. "Large financial services companies offering private banking and wealth management services are not of interest to them."

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