Private Foundation

Janet & Robert W Postma Foundation

Janet & Robert W Postma Foundation is a Private Foundation headquartered in Water Mill, NY. Financial data from the 2025 filing: $-330K revenue, $475K expenses, $4.1M total assets. IRS filings disclose 91 grants awarded by this foundation, totaling roughly $1.1M.

EIN: 853636639 Water Mill, NY Private Grantmaking Foundations NTEE: T20 Latest filing: 2025
Total Revenue$-330K
Total Expenses$475K
Total Assets$4.1M
Grants Given91
Grant Total$1.1M
Filing Years2020–2025

Sample Grants Given

Southhampton Hospital Foundation
Southampton, NY · 2025
Tax Exempt Contribution
$100,000
North Sea Maritime Center
Southampton, NY · 2025
Tax Exempt Contribution
$51,500
HSS Foundation
New York, NY · 2025
Tax Exempt Contribution
$51,000
Leadership Roundtable
Washington, DC · 2025
Tax Exempt Contribution
$50,000
CMTA
Glenolden, PA · 2025
Tax Exempt Contribution
$25,000

Showing up to 5 of 91 total records — full history available with membership.

Officers & Directors

VP Secretary Treasurer Janet Whalen
Director Kristen Slaoui
President Robert W Postma

Officer compensation and complete director data available with membership.

Top Grant Purposes

Tax Exempt Contribution
$891,250 62 grants
TO FURTHER DONEE'S EXEMPT PURPOSE
$227,570 29 grants

Financial Trends

Year Revenue Expenses Assets
2025 $-330K $475K $4.1M
2024 $-593K $470K $4.9M
2023 $-38K $106K $6.0M
2022 $1K $159K $6.1M
2020 $6.5M — $5.0M

Between 2020 and 2025, reported annual revenue moved from $6.5M to $-330K, with total assets most recently reported at $4.1M.

Interactive year-over-year charts and full filing details available with membership.

Grant Geography

Grants from this foundation were reported to recipients in DC, GA, IL, MA, NJ, NY, and 2 other states.

DCGAILMANJNYPAVT

Full geographic grant map with state-by-state breakdown available with membership.

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