# Muriel F Siebert Foundation Inc

Muriel F Siebert Foundation Inc is a Private Foundation based in Southampton, United States.

## Overview

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

## About

The IRS Exempt Organizations Business Master File snapshot retrieved on 2026-10-14 identifies Muriel F Siebert Foundation Inc as a private grantmaking foundation exempt under Section 501(c)(3). Its Employer Identification Number is 13-6266367. Its reported mailing city is Southampton, New York, United States. For the tax period ending December 2025, the retained IRS record reports total assets of USD 39,514,643. Reported income for that tax period is USD 2,125,518. The IRS ruling year recorded in this snapshot is 1968. 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: 2026-10-23T07:51:13Z

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