# Sonnentag Foundation Ltd

Sonnentag Foundation Ltd is a Private Foundation based in Marathon, United States.

## Overview

- **Organization type:** Private Foundation
- **Headquarters:** Marathon, United States
- **Region:** North America

## About

The IRS Exempt Organizations Business Master File snapshot retrieved on 2026-10-14 identifies Sonnentag Foundation Ltd as a private grantmaking foundation exempt under Section 501(c)(3). Its Employer Identification Number is 39-1597420. Its reported mailing city is Marathon, Wisconsin, United States. For the tax period ending December 2025, the retained IRS record reports total assets of USD 43,384,208. Reported income for that tax period is USD 32,604,765. The IRS ruling year recorded in this snapshot is 1988. Total assets are balance-sheet assets, not assets under management. These are dated IRS records; they do not establish current finances or a present investment mandate.

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Updated: 2026-10-23T09:41:15Z

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