Nonprofit · EIN 87-1876876
POLG FOUNDATION
Tax-exempt · NEW YORK, NY 10016
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $3,364,753 | $2,107,901 | $1,256,852 | $8,622,383 | $785,799 | $7,836,584 |
| December 31, 2024 | 990 | $1,297,847 | $2,097,172 | -$799,325 | $6,529,501 | $448,201 | $6,081,300 |
| December 31, 2023 | 990 | $983,511 | $2,087,691 | -$1,104,180 | $7,528,235 | $587,962 | $6,940,273 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $3,068,631
- Program service revenue
- $0
- Investment income
- $254,740
- Net gain from sales of assets
- $58,369
- Other revenue
- $41,382
Expenses
- Grants and similar amounts paid
- $1,319,962
- Compensation of officers, directors and key employees
- $180,833
- Salaries, compensation and benefits (total)
- $195,367
- Professional fundraising fees
- $0
- Accounting fees
- $60,750
- Travel
- $1,271
- Program services (functional)
- $1,921,379
- Management and general (functional)
- $186,522
Balance sheet and other
- Total assets, start of year
- $6,529,501
- Total assets, end of year
- $8,622,383
- Total liabilities, end of year
- $785,799
- Net assets, end of year
- $7,836,584
- Publicly traded securities
- $6,815,616
- Net assets without donor restrictions
- $5,379,022
- Net assets with donor restrictions
- $2,457,562
- Gross receipts
- $3,840,662
- Employees
- 1
- Year formed
- 2021
- State of legal domicile
- DE
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 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| BRIAN TSENG | Director / CSO | 40 | $315,983 |
| ROBERT DE LUXEMBOURG | Chairman Trustee or director | 1 | $0 |
| JULIE DE LUXEMBOURG | Vice Chair Trustee or director | 1 | $0 |
| CINDY GAVIN | Director Trustee or director | 1 | $0 |
| REMY BEST | Director Trustee or director | 1 | $0 |
| ALLYSON OCEAN | Director Trustee or director | 1 | $0 |
| JENNIFER ADAMS | Director Trustee or director | 1 | $0 |
| FRANCESCO DE RUBERTIS | Director Trustee or director | 1 | $0 |
| STVEN ALTSCHULER | Director Trustee or director | 1 | $0 |
| JRG DUSCHMALE | Director Trustee or director | 1 | $0 |
| EILEEN KANE | Corp. Secretary Institutional trustee | 1 | $0 |
| MARCUS SIEZING | Treasurer Institutional trustee | 1 | $0 |
990 for the year ended December 31, 2024: 13 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| SAMUEL SEWARD | Executive Dir. | 40 | $196,923 |
| BRIAN TSENG | Director Trustee or director | 40 | $149,813 |
| ROBERT DE LUXEMBOURG | Chairman Trustee or director | 1 | $0 |
| JULIE DE LUXEMBOURG | Vice Chair Trustee or director | 1 | $0 |
| CINDY GAVIN | Director Trustee or director | 1 | $0 |
| REMY BEST | Director Trustee or director | 1 | $0 |
| ALLYSON OCEAN | Director Trustee or director | 1 | $0 |
| JENNIFER ADAMS | Director Trustee or director | 1 | $0 |
| FRANCESCO DE RUBERTIS | Director Trustee or director | 1 | $0 |
| STVEN ALTSCHULER | Director Trustee or director | 1 | $0 |
| JRG DUSCHMALE | Director Trustee or director | 1 | $0 |
| EILEEN KANE | Corp. Secretary Officer | 1 | $0 |
| MARCUS SIEZING | Treasurer Officer | 1 | $0 |
990 for the year ended December 31, 2023: 12 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| BRIAN TSENG | DIRECTOR / CHIEF SCIENCE OFFICER Trustee or director | 7 | $206,975 |
| ROBERT DE LUXEMBOURG | CHAIR Trustee or director, Officer | 1 | $0 |
| JULIE DE LUXEMBOURG | VICE CHAIR Trustee or director, Officer | 7 | $0 |
| CINDY GAVIN | DIRECTOR AND SECRETARY Trustee or director, Officer | 1 | $0 |
| EILEEN KANE | CORPORATE SECRETARY Trustee or director, Officer | 1 | $0 |
| MARCUS SIEZING | TREASURER Trustee or director, Officer | 3 | $0 |
| REMY BEST | DIRECTOR Trustee or director | 1 | $0 |
| ALLYSON OCEAN | DIRECTOR Trustee or director | 1 | $0 |
| JENNIFER ADAMS | DIRECTOR Trustee or director | 1 | $0 |
| FRANCESCO DE RUBERTIS | DIRECTOR Trustee or director | 1 | $0 |
| STVEN ALTSCHULER | DIRECTOR Trustee or director | 1 | $0 |
| JORG DUSCHMALE | DIRECTOR Trustee or director | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 99 PARK AVE FL 24, NEW YORK, NY 10016-0313
- In care of
- % KESWICK MANAGEMENT
- Signed the 990
- MARCUS SIEZING, Treasurer
- Phone
- (212) 315-8339
- Website
- POLGFOUNDATION.ORG
- Return prepared by
- RLN US LLP
Mission
THE PURPOSES FOR WHICH THE FOUNDATION IS FORMED ARE TO ADDRESS THE UNMET MEDICAL NEEDS OF PATIENS WITH POLG-RELATED DISORDERS WITH THE GOAL OF BEING ABLE TO MITIGATE OR CURE SUCH DISORDERS. THE FOUNDATION INTENDS TO (I) IDENTIFY HIGH-QUALITY SCIENTIFIC RESEARCH AND DISCOVERIES IN THE TREATMENT AND DIAGNOSIS OF POLG-RELATED DISORDERS, (II) PROVIDE CAPITAL TO ASSIST IN THE DEVELOPMENT OF NEW TREATMENTS AND DIAGNOSTIC TOOLS FOR SUCH DISORDERS; AND (III) FUND RESEARCH [AND] CLINICAL TRIALS, AND INVEST IN MISSION-RELATED BUSINESS.
Program accomplishments
- POLG FOUNDATION'S SUPPORTS AND ACCELERATES RESEARCH TO FIND EFFECTIVE TREATMENTS AND A CURE FOR POLG-RELATED MITOCHONDIRAL DISORDERS.Expenses $1,921,379 · grants $1,319,962
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 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 87-1876876
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 2021
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Voluntary health associations and medical disciplines (G20)
- Assets (IRS master file)
- $8,622,383
- Income (IRS master file)
- $3,840,662
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $3,364,753 | $2,107,901 | $8,622,383 | IRS |
| 990 | December 2024 | $1,297,847 | $2,097,172 | $6,529,501 | IRS |
| 990 | December 2023 | $983,511 | $2,087,691 | $7,528,235 | XML |
| 990 | December 2022 | $7,954,948 | $791,460 | $8,139,856 | IRS |
| 990 | December 2021 | – | – | – | IRS |
990-N: the IRS publishes only the latest e-Postcard per organization; earlier years appear here as 990.tax collects the monthly files. 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.
Questions about POLG FOUNDATION
- What is the EIN of POLG FOUNDATION?
- The employer identification number (EIN) of POLG FOUNDATION is 87-1876876.
- Is POLG FOUNDATION tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2021.
- Are donations to POLG FOUNDATION tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does POLG FOUNDATION 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 POLG FOUNDATION 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 POLG FOUNDATION last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who are the officers and directors of POLG FOUNDATION?
- The 990 for the year ended December 31, 2025 lists 12 people; 1 received compensation from the organization, the highest $315,983 (BRIAN TSENG, Director / CSO).
- How much revenue does POLG FOUNDATION have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $3,364,753, expenses of $2,107,901 and total assets of $8,622,383 at year end.
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