The Clamshell Foundation
Legal name: The Clamshell Foundation Inc
Nonprofit profile at a glance
- EIN
- 113227901
- IRS 990-EZ coverage
- 2010–2025
- Official website data refreshed
- Sep 2026
- Forms available
- Form 990 2020, Form 990-EZ 2025, Form 990-N 2007
- Location
- East Hampton, NY, US
- Phone
- 6319037000
- Rating
- 90
- Verdict
- STRONG
- Rating confidence
- Moderate
- Sector
- Water Resource, Wetlands Conservation and Management
Reported finances
- Revenue
- $38,046
- Expenses
- $41,466
- Assets
- $40,601
Source: IRS Form 990-EZ. Selected filing: tax year 2025. Amounts in USD.
Leadership & pay
6 people listed
Executive titles in this filing
- WILLIAM KALBACHER (CEO)
People named in this filing
- KORI PETERS (Executive Dir.)
- WILLIAM KALBACHER (CEO)
- KELSEY DEMARQUEZ (Secretary)
Selected names, not a complete roster or a statement of current roles. Open leadership details for the complete filed list.
Source: IRS Form 990-EZ. Selected filing: tax year 2025. Names and roles reflect this filing, not necessarily current officeholders.
Overview
Mission
The Clamshell Foundation supports the people, programs, and projects of the East End of Long Island.
What it reported doing in 2025
The purpose of the corporation, as stated in our charter, is to enrich the lives of others by fostering education in health, cultural, and environmental fields of endeavor. Currently, we are concentrating our efforts on community based concerns such as local food pantries and educational projects.
Operating model
- Revenue model
- Cannot be determined from the filing. The filing does not provide enough consistent revenue detail to tell how this nonprofit funds its work.
- Distribution model
- Grant intermediary. The nonprofit sent 96% of its reported program spending out as grants.
The verdict
STRONG - A large share of available resources goes toward mission work and the filed numbers largely add up. Program spending has declined or grown slowly and expenses are high relative to revenue.
Rating breakdown
- Financial Efficiency: 90
- Transparency & Controls: 100
- Sustainability: 35
- Growth: 60
Detailed rating inputs
Financial Efficiency
- Mission deployment rate: 92.9%; rating input score 93
- Program expense ratio: 85.2%; rating input score 85
Transparency & Controls
- Consistency checks: 100%; rating input score 100; 51st percentile among comparable filings
- Major donor itemization: Yes; rating input score 100
Sustainability
- Operating margin: -9%; rating input score 30; 30th percentile among comparable filings
- Total-asset coverage ratio: 0.98; rating input score 47; 47th percentile among comparable filings
- Liabilities to assets ratio: Limited
- Officer compensation ratio: 0%; rating input score 56; 56th percentile among comparable filings
Growth
- Program expense growth: -8.1% per year; rating input score 0; 31st percentile among comparable filings
- Revenue growth: 1% per year; rating input score 100; 54th percentile among comparable filings
- Asset growth: 13.3% per year; rating input score 100; 76th percentile among comparable filings
Details
- What they do: 7 programs and campaigns described on the official site · 1 operating location identified
- Where the money goes: 92.9% of revenue deployed · 85.2% of spending went to programs
- Governance: Filed governance answers
- Accomplishments: 1 filed program accomplishment · $35K in reported program spending
- Leadership: top reported pay $0 · 6 people listed
- Consistency: 7 of 7 current checks pass
- Schedules: 4 filed schedules
- Filing history: 15 filing years from 2010 to 2025
- Contacts: How to reach this organization
- Money network: 9 filed money-flow records
- Related organizations: 7 filed related-organization links
- Grant readiness: Federal tax and exclusion status, award history, and grant-maker relationships.
- People: Everyone the filings name, and which of them the filings identify by more than a name.
Key Signals
Signals prioritize questions for review. They are not findings of misconduct.
- High — Growth: Program expense growth scored 0/100.
- Moderate — Sustainability: Operating margin scored 30/100.
- Moderate — Sustainability: Total-asset coverage ratio scored 47/100.
- Review — Sustainability: Officer compensation ratio scored 56/100.