SEI Sells Family Office Services Business to Aquiline for $120M 

SEI has revealed plans to offload its Family Office Services division to Aquiline Capital Partners, a private investment firm, for $120 million. The deal is slated to finalize late in the second quarter of 2025. 

The agreement covers moving Family Office Services staff from SEI’s offices in Indianapolis, Denver, and Oaks—including key leadership team members—over to Aquiline. The acquisition aims to further invest in and extend the platform’s capabilities under Aquiline’s ownership. 

After the acquisition, the business will rebrand as Archway. The Archway Platform, which was managing $723 billion in assets as of December 31, 2024, delivers tech solutions and outsourced services—covering accounting, investment management, and reporting—for ultra-high-net-worth families. 

“As part of SEI’s broader growth strategy, we’re committed to investing in the areas of our business where we believe we can drive growth, and for more than seven years, we’ve made substantial investments in the solutions and capabilities we deliver for the family office segment,” said Sandy Ewing, head of SEI’s Family Office Services business. 

Morgan Stanley & Co. LLC served as financial advisor to Aquiline, and Ropes & Gray LLP served as legal counsel to Aquiline. Holland & Knight served as legal counsel to SEI.