Private Foundation

SONNENTAG FOUNDATION LTD

SONNENTAG FOUNDATION LTD, of MARATHON, WI, is a Private Foundation tracked in Imperigo's IRS 990 database. The 2025 filing shows $4.6M in revenue, $6.5M in expenses, $43.4M in total assets. IRS filings disclose 6 grants awarded by this foundation, totaling roughly $27.9M.

EIN: 391597420 MARATHON, WI Latest filing: 2025
Total Revenue$4.6M
Total Expenses$6.5M
Total Assets$43.4M
Grants Given6
Grant Total$27.9M
Filing Years2020–2025

Sample Grants Given

ALL-SEE ATTACHED
Marathon, WI · 2025
CHARITABLE DONATIONS
$6,371,389
ALL - SEE ATTACHED
MARATHON, WI · 2024
CHARITABLE DONATIONS
$9,431,634
ALL - SEE ATTACHED
MARATHON, WI · 2023
CHARITABLE DONATIONS
$1,178,234
ALL - SEE ATTACHED
VARIOUS, WI · 2022
SCHOLARSHIPS AND CHARITABLE DONATIONS
$7,148,102
ALL - SEE ATTACHED
MARATHON, WI · 2020
SCHOLARSHIPS AND CHARITABLE DONATIONS
$854,039

Showing up to 5 of 6 total records — full history available with membership.

Officers & Directors

DIRECTOR PART TIME Bill Sonnentag
VICE PRESIDENT PART TIME Carolyn Sonnentag
PRESIDENT John Sonnentag

Officer compensation and complete director data available with membership.

Top Grant Purposes

CHARITABLE DONATIONS
$16,981,257 3 grants
SCHOLARSHIPS AND CHARITABLE DONATIONS
$10,924,576 3 grants

Financial Trends

Year Revenue Expenses Assets
2025 $4.6M $6.5M $43.4M
2024 $16.8M $9.6M $45.3M
2023 $6.5M $1.2M $38.0M
2022 $-29.3M $7.4M $32.7M
2020 $25.4M $933K $56.9M

Between 2020 and 2025, reported annual revenue declined from $25.4M to $4.6M (-82%), with total assets most recently reported at $43.4M.

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

Grant Geography

Grants from this foundation were reported to recipients in WI.

WI

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

See the full picture for SONNENTAG FOUNDATION LTD

Complete financials, all 6 grant records, officer compensation, year-over-year trend charts, a geographic grant map, and data exports — across 498,000+ organizations.

Full Financial History Complete Grant Activity Officer Compensation Year-over-Year Charts Geographic Grant Map Data Exports
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