The shopping spree continues at Mercer Advisors, which announced its second acquisition of the month Monday, pushing the fast-growing acquirer to nearly $14 billion in assets under management.

This week’s deal involves Sigma Investment Management Co., a Portland, Ore.-based registered investment adviser with $500 million in assets under management.

The announcement comes just a week after Mercer secured an agreement to acquire Beacon Wealth Management, a $230 million RIA with offices in Hackensack, N.J., and Palm Beach, Fla.