Atlantic Trust, the private wealth management division of Invesco Ltd., has been named the nation's top wealth management firm by the Luxury Institute.

The New York-based research firm said Atlantic Trust achieved top scores in its 2011 Luxury Brand Status Index (LBSI), out of 35 private wealth management firms in the survey.

The index measures firms in four categories: quality, exclusivity, social status and self-enhancement, based on surveys of 500 pentamillionaires-consumers with annual income of $200,000 and a minimum net worth of $5 million.

In addition to leading in the overall score, Atlantic Trust, which has about $17.5 billion in assets under management, ranked first in terms of uniqueness and exclusivity, and having clients who are admired and respected, according to the Luxury Institute.

"This recognition validates our firm's commitment to serve as our clients' most trusted advisor and deliver the highest quality client experience," said Jack Markwalter, chairman and CEO of Atlantic Trust.