Seattle, WA (December 19, 2024) ­- Rainier Partners, a private equity firm investing in lower middle-market services businesses, is pleased to announce its investment in Welfare & Pension Administration Service (“WPAS”), a third-party administration (TPA) firm specializing in multi-employer benefit plan administration. Based in Mercer Island, WA, WPAS has a 70+ year history of dedicated,… Read More