Nonprofit · EIN 56-2259409
INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS
Tax-exempt · NEW YORK CITY, NY 10011
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990-EZ | $120,980 | $43,071 | $77,909 | $163,990 | – | $163,990 |
| December 31, 2024 | 990-EZ | $22,078 | $46,741 | -$24,663 | $86,080 | – | $86,080 |
| December 31, 2023 | 990-EZ | $67,109 | $44,414 | $22,695 | $110,742 | – | $110,742 |
Financial details: 990-EZ for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $120,980
Expenses
- Compensation of officers, directors and key employees
- $0
- Professional fees and payments to contractors
- $1,477
- Printing, publications and postage
- $30,525
- Other expenses
- $11,069
- Program services (functional)
- $43,071
Balance sheet and other
- Total assets, start of year
- $86,081
- Total assets, end of year
- $163,990
- Total liabilities, end of year
- –
- Net assets, end of year
- $163,990
- Cash, savings and investments
- $163,990
- Gross receipts
- $120,980
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990-EZ for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| CHRISTIAN WACKER | PRESIDENT | 0 | $0 |
| KONSTANTINOS GEORGIADIS | VICE PRESIDE | 0 | $0 |
| HECTOR ARGUELLES MENENDEZ | TREASURER | 0 | $0 |
| MARCUS OSTERWALDER | BOARD MEMBER | 0 | $0 |
| TOLGA SINOFOROGLU | BOARD MEMBER | 0 | $0 |
| MARIA BULATOVA | BOARD MEMBER | 0 | $0 |
| NICHOLAS WOLAVER | BOARD MEMBER | 0 | $0 |
| PHILLIP BARKER | BOARD MEMBER | 0 | $0 |
| RICHARD POUND | BOARD MEMBER | 0 | $0 |
| DAVID WALLECHINSKY | BOARD MEMBER | 0 | $0 |
| ELIZABETH A HANLEY | BOARD MEMBER | 0 | $0 |
| TRACEY SAVELL REAVIS | BOARD MEMBER | 0 | $0 |
990-EZ for the year ended December 31, 2024: 12 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| CHRISTIAN WACKER | PRESIDENT | 0 | $0 |
| KONSTANTINOS GEORGIADIS | VICE PRESIDE | 0 | $0 |
| HECTOR ARGUELLES MENENDEZ | TREASURER | 0 | $0 |
| MARCUS OSTERWALDER | BOARD MEMBER | 0 | $0 |
| TOLGA SINOFOROGLU | BOARD MEMBER | 0 | $0 |
| MARIA BULATOVA | BOARD MEMBER | 0 | $0 |
| NICHOLAS WOLAVER | BOARD MEMBER | 0 | $0 |
| PHILLIP BARKER | BOARD MEMBER | 0 | $0 |
| RICHARD POUND | BOARD MEMBER | 0 | $0 |
| DAVID WALLECHINSKY | BOARD MEMBER | 0 | $0 |
| ELIZABETH A HANLEY | BOARD MEMBER | 0 | $0 |
| TRACEY SAVELL REAVIS | BOARD MEMBER | 0 | $0 |
990-EZ for the year ended December 31, 2023: 9 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| DAVID WALLECHINSKY | BOARD MEMBER | 0 | $0 |
| CHRISTIAN WACKER | PRESIDENT | 0 | $0 |
| MARCUS OSTERWALDER | SECRETARY GE | 0 | $0 |
| HECTOR ARGUELLES MENENDEZ | TREASURER | 0 | $0 |
| RICHARD POUND | BOARD MEMBER | 0 | $0 |
| KONSTANTINOS GEORGIADIS | VICE PRESIDE | 0 | $0 |
| MARIA BULATOVA | BOARD MEMBER | 0 | $0 |
| PHILLIP BARKER | BOARD MEMBER | 0 | $0 |
| CESAR TORRES | BOARD MEMBER | 0 | $0 |
Address and contacts
- Address (IRS master file)
- 85 8TH AVE APT 2W, NEW YORK CITY, NY 10011-5123
- In care of
- % WILLIAM J MALLON
- Signed the 990-EZ
- HECTOR ARGUELLES MENENDEZ, TREASURER
- Phone
- (603) 646-7455
- Website
- WWW.ISOH.ORG
- Return prepared by
- DEVRIES ASSOCIATES CPA
Mission
PROMOTE AND STUDY OLYMPIC MOVEMENT
Program accomplishments
- PUBLICATION OF RESEARCH AND HISTORICAL MATERIALS AND JOURNALSExpenses $43,071
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990-EZ on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990-EZ on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990-EZ on file |
IRS record
- EIN
- 56-2259409
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (509(a)(2))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 2003
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Recreation and sports (N197)
- Assets (IRS master file)
- $163,990
- Income (IRS master file)
- $120,980
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-EZ | December 2025 | $120,980 | $43,071 | $163,990 | XML |
| 990-EZ | December 2024 | $22,078 | $46,741 | $86,080 | IRS |
| 990-EZ | December 2023 | $67,109 | $44,414 | $110,742 | XML |
| 990-EZ | December 2022 | – | – | – | IRS |
| 990-EZ | December 2021 | – | – | – | IRS |
| 990-EZ | December 2020 | – | – | – | IRS |
| 990-EZ | December 2019 | – | – | – | IRS |
| 990-EZ | December 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 56-2259409).
Questions about INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS
- What is the EIN of INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS?
- The employer identification number (EIN) of INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS is 56-2259409.
- Is INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2003.
- Are donations to INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS last file with the IRS?
- The latest return in the IRS public files is the 990-EZ for the year ended December 2025.
- Who are the officers and directors of INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS?
- The 990-EZ for the year ended December 31, 2025 lists 12 people; 0 received compensation from the organization.
- How much revenue does INTERNATIONAL SOCIETY OF OLYMPIC HISTORIANS have?
- On its 990-EZ for the year ended December 31, 2025 it reported revenue of $120,980, expenses of $43,071 and total assets of $163,990 at year end.
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