In the early 1970s, Farmers Union Central Exchange, later known as CENEX and part of Cenex Harvest States (CHS), developed a thrift savings plan for its affiliated local cooperatives. That savings plan matured into the Co-op 401(k) Plan, the largest plan of its type in the United States, which Milliman has continued to successfully administer and grow over the years.

2008		Fiduciary Board approves increased flexibility for profit sharing allocations, eligibility rules, and vesting schedules
2007		Roth 401(k) contributions are added to the plan
2006		The Milliman Co-op 401(k) Plan Fiduciary Board approves the plan's seventh overall and third consecutive fee reduction
		Milliman introduces a new, more personalized account statement
		Plan assets top $400 million
2005		Milliman unveils a new branding identity for the Co-op 401(k) Plan
		The Co-op 401(k) Plan Fiduciary Board approves the plan's largest fee reduction in its 11-year history
2004		Milliman expands the plan's Benefits Service Center and adds paperless withdrawls
		The Milliman Co-op 401(k) Plan celebrates 10 years of service
		Plan assets top $300 million
2003		Milliman adds options for participants to have their accounts professionally managed through Agi-Invest, LLC
2002		Milliman launches a comprehensive investment advice program
2001		Online investment advice module and auto rebalance features added to the plan's Web Service Center
		Same-day exchange capabilities are implemented
2000		Plan assets top $200 million
		Milliman partners with Agi-Invest to offer direct investment advice for retirees and participants nearing retirement
		The plan's Web Service Center is launched
1998		Triangle Cooperative Service Company endorses the plan
		Farmland Industries merges with SF Services and selects Milliman as the preferred 401(k) plan provider for 60 local cooperatives affiliates
1997		Plan assets reach $100 million
1996		21 Harvest States affiliates consolidate with the plan
1995		Assets are transferred to the Charles Schwab Trust Company
		Milliman unveils a new participation review program designed to boost employee participation
1994		Milliman is hired as the new service provider for the plan, which is renamed Co-op 401(k) Plan
1991		The Y.E.S. Retirement Plan Committee is officially recognized