Focus Financial Partners LLC on Tuesday announced it added Bridgewater Wealth & Financial Management LLC to its roster of partner firms. Terms of the deal weren't disclosed.

Based in Bethesda, Md., Bridgewater Wealth is a combination RIA and CPA practice founded by Ron Rubin and Gary Kasnett. The firm has offices in Washington, D.C. and New York City, and manages $200 million in assets. 

Focus Financial has bought stakes in 19 wealth management firms with more than $33 billion in assets since it was launched in 2006. Based in New York, Focus typically purchases equity stakes of 40% to 70% in its partner firms. In return, it promises to provide advisory practices with the technology, back office support and scale needed to grow their business while retaining their independence.

The acquisition strategy is aimed at achieving the critical mass needed to take the entity public.