The Cornerstone School
Fiscal year ending 2025. Filed on December 16, 2025.
146 High Street
Stratham, New Hampshire 03885
The Cornerstone School (EIN: 22-2730159) has filed an IRS Form 990 since fiscal year 2021. In its fiscal year 2025 IRS Form 990 filing, The Cornerstone School, a 501(c)(3) charitable organization, reported compensation for 1 out of 46 total employees. Among the employees shown here, the average compensation is $144,000. The highest compensated employee at The Cornerstone School is Peter Zetlan with fiscal year 2025 compensation of $144,000.
Revenue, expenses, and employee compensation
Revenue
$2,890,588
Expenses
$2,697,681
Employee compensation
$2,087,719
Reported Compensated Employees
Mission Statement
TO PROVIDE MONTESSORI EDUCATION TO CHILDREN AGES 15 MONTHS TO 14 YEARS OLD
Other organizations also named The Cornerstone School
Cornerstone Schools of Alabama Inc.
Birmingham, Alabama
Cornerstone Schools of Washington DC Inc.
Washington, District of Columbia
Cornerstone School of Summit Inc.
Summit, New Jersey
Cornerstone Schools Association
Detroit, Michigan
Cornerstone Schools Inc.
Jacksonville, Florida
Cornerstone School at Pedregal Bstr Club
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Revisions to this organization profile
December 16, 2025:
2025 The Cornerstone School 990 filed
November 13, 2024:
2024 The Cornerstone School 990 filed
November 14, 2023:
2023 The Cornerstone School 990 filed
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