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SPACE FRONTIER FOUNDATION INC

EIN 13-3542980 WASHINGTON, DC

Largest nonprofits in District of Columbia

Revenue 2025
$122,872
Expenses 2025
$314,692

Program services were 66.0% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
U01
Classification
2000
Street
1455 PENNSYLVANIA AVE NW STE 400

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Other organizations at this address

45 other organizations in the IRS Business Master File list the same street address. matched by us

This address is a suite or unit (STE 400). Organizations that share one are often clients of the same office-services firm, accountant or registered agent rather than related to each other.

We match the street line and ZIP code as the IRS gives them, ignoring case and outer spaces and nothing else, so "AVE" and "AVENUE" count as different streets and this list can miss some. A shared address can mean related organizations or a shared office, but it can also be a registered agent, a mail drop or a service provider holding mail for unrelated clients. It is not, by itself, evidence that two organizations are connected.

Mission and programs · 2025

Mission

Education of the public on issues of space exploration, development and settlement, and the development and settlement of space by nongovernmental means.

  • Pathfinder Initiative: By leveraging access to policy leaders and robust academic research, Pathfinder will develop the international standard for a stable carbon market with robust American participation.

    Expenses $143,886

  • Political Advocacy: The Space Frontier Foundation remains one of the most effective organizations that pursues legislation expressing Congress' support for commercial space development as an organizing goal of U.S. space policy.

    Expenses $59,775

  • Space Based Solar Power: The Space Frontier Foundation advanced its mission to create the landscape and conditions necessary for commercial Space Solar Power (SSP) to become viable,competitive, and ultimately self-sustaining. Across U.S. Government engagement, industry convening, student development, and media leadership, SFF is becoming the recognized nexus for SSP advocacy and coordination globally.

    Expenses $4,126

As filed on the 2025 return.

Officers and directors · 2025

As listed in Part VII of the 2025 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • Aaron Oesterle

    Director

    Total calculated
    $54,000
    From this org
    $54,000
    From related orgs
    $0
    Other
    $0
    Hours/week
    8

  • Michael Mealling

    Director

    Total calculated
    $0
    Hours/week
    0

  • Miekkal Clarkson

    Director

    Total calculated
    $0
    Hours/week
    0

  • Sean Mahoney

    Board Chair

    Total calculated
    $0
    Hours/week
    0

  • Taylor Winkleman

    Director

    Total calculated
    $90,757
    From this org
    $90,757
    From related orgs
    $0
    Other
    $0
    Hours/week
    15

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. Earlier years are each on their own filing page.

Filings

  • 2025
    Revenue
    $122,872
    Expenses
    $314,692
    Contributions
    $100,000
    Grants paid
    $0
  • 2023
    Revenue
    $24,904
    Expenses
    $186,423
    Contributions
    $857
    Grants paid
    $63,221

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Grants made

Where these grants went next →

Grants received

Other IRS files

Auto-Revocation List

  • Exemption revoked 15 May 2022, reinstated 15 May 2022.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 1 November 2026, for every organization at once. Returns through tax year 2025, the newest we have parsed for this organization.