Mission
The Agency provides a residential setting to assist adults with developmental disabilities to accomplish and maintain their highest attainable living skills and to improve their quality of life by supporting independence.
Public Charity
Group Main Stream Incorporated
Based in Westbrook, ME, Group Main Stream Incorporated operates as a Public Charity. The organization reported $14.0M in revenue, $13.4M in expenses, $8.3M in total assets for fiscal year 2025.
EIN: 010371245
Westbrook, ME
Latest filing: 2025
Total Revenue$14.0M
Total Expenses$13.4M
Total Assets$8.3M
Grant Records1
Filing Years2021–2025
Officers & Directors
Executive Director
Ann-Marie Mayberry
Director
Jeff Bryan
Vice President
Katlyn Davidson
President
Marie Gray
Treasurer
Mary Arnold
Secretary
Mona Hilborn
Officer compensation and complete director data available with membership.
Financial Trends
| Year | Revenue | Expenses | Assets |
|---|---|---|---|
| 2025 | $14.0M | $13.4M | $8.3M |
| 2024 | $13.1M | $12.9M | $7.7M |
| 2023 | $13.0M | $12.3M | $7.4M |
| 2022 | $15.0M | $12.6M | $6.0M |
| 2021 | $12.3M | $11.6M | $5.1M |
Between 2021 and 2025, reported annual revenue grew from $12.3M to $14.0M (+14%), with total assets most recently reported at $8.3M.
Interactive year-over-year charts and full filing details available with membership.