Private Foundation

MAINWARING FAMILY FOUNDATION

Based in WILMINGTON, DE, MAINWARING FAMILY FOUNDATION operates as a Private Foundation. The organization reported $20.5M in revenue, $236K in expenses, $19.5M in total assets for fiscal year 2025. Imperigo tracks 51 reported grants from this foundation totaling approximately $968K.

EIN: 822289585 WILMINGTON, DE Private Grantmaking Foundations NTEE: T20 Latest filing: 2025
Total Revenue$20.5M
Total Expenses$236K
Total Assets$19.5M
Grants Given51
Grant Total$968K
Filing Years2021–2025

Sample Grants Given

HELENA SYMPHONY
HELENA, MT · 2025
UNRESTRICTED GIFT
$65,000
HOLTER MUSEUM OF ART
HELENA, MT · 2025
GENERAL PURPOSE
$45,000
PRICKLY PEAR LAND TRUST
HELENA, MT · 2025
GENERAL PURPOSE
$15,000
AMERICAN PRAIRIE FOUNDATION
BOZEMAN, MT · 2025
GENERAL PURPOSE
$15,000
HELENA FOOD SHARE
HELENA, MT · 2025
GENERAL PURPOSE
$12,000

Showing up to 5 of 51 total records — full history available with membership.

Officers & Directors

TRUSTEE Scott Mainwaring
TRUSTEE Susan Benedict

Officer compensation and complete director data available with membership.

Top Grant Purposes

UNRESTRICTED GIFT
$604,500 21 grants
GENERAL PURPOSE
$232,112 14 grants
GENERAL
$131,085 16 grants

Financial Trends

Year Revenue Expenses Assets
2025 $20.5M $236K $19.5M
2024 $203K $212K $3.8M
2023 $64K $207K $3.8M
2022 $131K $235K $4.0M
2021 $305K $174K $4.1M

Between 2021 and 2025, reported annual revenue grew from $305K to $20.5M (+6617%), with total assets most recently reported at $19.5M.

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

Grant Geography

Grants from this foundation were reported to recipients in DC, MD, MT, PA, VA.

DCMDMTPAVA

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

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