California-based specialty insurance broker Alliant Insurance Services has completed the acquisition of Thesco Retirement Planning Services (TRPS), a New York-based 401(k) advisory and brokerage firm.

The terms of the transaction remain undisclosed.

Alliant Insurance CEO Tom Corbett said the acquisition of Thesco Retirement complements the company’s plans to extend its presence in the 401(k) marketplace in the Northeast region.

Alliant provides workers’ compensation, employee benefits, surety, and financial products and services to about 20,000 customers nationwide and also serves public entities, tribal nations, and the energy, healthcare, legal and construction industries.

Founded in 2001, TRPS manages a broad range of retirement plans most of which are in the defined contribution plan category.