Mercer Advisors Inc., a national registered investment advisor based in Santa Barbara, has acquired Ray Mignone Associates, a provider of financial planning and investment management services with $290 million of assets under management.

The acquisition strengthens Mercer’s presence in New York and Florida by adding offices in Little Neck, N.Y., and Boynton Beach, Fla. It is the seventh acquisition this year for Mercer, which now has $11.3 billion in assets under management and 7,700 clients nationwide. Terms of the deal were not announced.