GoldK acquired the retirement plan services division of Gallagher Benefit Services of Michigan. The deal adds about $700 million in plan assets and more than 25,000 active participants in more than 300 plans to GoldKs web-based record-keeping platform. Terms were not disclosed. Gallaghers 31 employees in the division will be retained by GoldK. Gallagher offers American Employers Retirement Trust, a proprietary defined contribution trust vehicle for smaller plan sponsors.