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
Where $100 goes at Group Main Stream Incorporated
How Group Main Stream Incorporated divides every $100 it spends, from its own Form 990 filings, averaged across 8 years.
$86
Programs
the work itself
$14
Management
running the organization
$0
Fundraising
none reported
No fundraising costs are reported. That often means fundraising runs through a separate affiliated organization that files its own return.
Inside the $86 for programs
$52
Provide consumers with another option from traditional group home settings and independent living that places the individual into a home with a family or supportive roommate
$30
Provide high quality residential facilities and services for adults with intellectual disabilities
$3
Provide case management services for consumers living on their own, with families, or in other staffed settings
Plus 1 more program. Cost per person served and the full program breakdown are on the full profile.
Source: Form 990 filings with the IRS, latest fiscal year 2025. Shares are from the organization's reported expenses. Data by Imperigo; not affiliated with the IRS.
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.