Two finalists were vying for the contract.
The plan launched a search last year to consolidate to a single record keeper from its previous three.
The 457(b) and 401(a) plans are in the market for record keeping/administration, communication/education and custodial trustee services.
The city last conducted a similar search for its retirement plans in 2017.
The plans terminated their mandate with domestic core-plus fixed-income manager Western Asset Management and hired a new record keeper in the fourth quarter.
The plans previously utilized MissionSquare Retirement.
The incumbent provider will see its contract with the plans expire in August.
The town last conducted a bundled provider search in 2017 on behalf of its deferred compensation plan.
The plan has retained its incumbent to continue providing record keeping and administration services.
The plans have a total of $8 million in assets.