What can you do with a mountainone account? MountainOne offers you banking services, customized insurance products, and comprehensive investment management with more flexibility. As your needs change and grow, MountainOne will be there to grow with you. MountainOne Is mountainone insurance a registered broker? Fixed insurance products and services offered through CES Insurance Agency or MountainOne Investments. MountainOne Bank is not a registered broker-dealer or Registered Investment Adviser. MountainOne Bank and MountainOne Insurance are not affiliated with Commonwealth.Is mountainone bank fdic insured? MountainOne Bank was established on Jan. 1, 1848. Headquartered in North Adams, MA, it has assets in the amount of $826,758,000. Its customers are served from 7 locations. Deposits in MountainOne Bank are insured by FDIC.Are mountainone and commonwealth affiliated with each other? MountainOne Bank and MountainOne Insurance are not affiliated with Commonwealth. MountainOne Investments’ main office is located at 85 Main Street, Suite 100, North Adams, MA 01247. (413) 664-4025