O'Brien's Centerville Insurance
- Arbella Insurance Group
- Barnstable County Mutual Insurance Company
- CNA Surety
- Coastal Agents Alliance
- Hagerty
- Mass Property
- Safety Ins.
- United Marine Undwrs.
- Universal P&C
- UPC
- S. B. O'Brien, Jr., President
- Kevin R. O'Brien, V.P.