# 3RIVERS Incorporated

Business profile: public business information with links to supporting state records. Data as of October 16, 2026.

- Legal business name: 3RIVERS Incorporated
- Alternative and DBA names: Group Main Stream Inc.
- Entity type: C corporation
- Original incorporation date: April 28, 1980
- Time in business: 46 years and 5 months
- Jurisdiction count: 2

## All known addresses

- 1280 PO Box, Westbrook, ME 04098 (listed in Maine)
- 15 Saunders Way Ste 500G, Westbrook, ME 04092 (listed in New Hampshire)

## Registered states

- [Maine](https://index.baselayer.com/me/23a0b1fc6a5e630f): Domestic registration
- [New Hampshire](https://index.baselayer.com/nh/21d1dcadab1e485b): Foreign registration
- [New Hampshire](https://index.baselayer.com/nh/91298dc030d185ea): Foreign registration, as Group Main Stream, Inc.

Source: public state registration records. Missing values are not a negative finding.

Cite as: Baselayer Business Index (https://index.baselayer.com/business/23a0b1fc6a5e630f)