Colorado-based Mercer Advisors has acquired Sigma Investment Management Company, a wealth manager based in Oregon, for an undisclosed sum.

Set up in 1992, Sigma tends to HNW clients across the Pacific Northwest region. The business manages over $500m in assets.

Commenting on Sigma, Mercer Advisors vice chairman David Barton said: “While many buyers were highly interested in partnering with them, Mercer Advisors won this transaction because our family office business model is complementary to their investment management platform.

“Stated differently, adding Mercer Advisors’ services like comprehensive financial and retirement planning, in-house estate planning, asset protection, tax return preparation, and corporate trustee services made the choice clear – Mercer Advisors’ multi-disciplinary approach to financial care was superior to other firms seeking to acquire Sigma.”

The acquisition of Sigma increases Mercer Advisors’ branch network to 30 and assets to nearly $14bn.

Mercer Advisors CEO Dave Welling said: “Sigma’s executive team led by Harmon Laurin and Bill Berg are seasoned professionals and pillars of the Portland community, and their 12-member team adds bench strength helping to fuel our intention to grow market share in Portland and surrounding communities.”

Mercer Advisors has been on an acquisition spree this year, with the most recent being the purchase of Beacon Wealth Management.