Nonprofit · EIN 20-2502389
MATHIESON FAMILY FOUNDATION
Tax-exempt · PITTSBURGH, PA 15215
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990-PF | $23,162 | $76,549 | -$53,387 | $834,883 | $0 | $834,883 |
| December 31, 2024 | 990-PF | $118,299 | $72,761 | $45,538 | $888,270 | $0 | $888,270 |
| December 31, 2023 | 990-PF | $74,293 | $77,406 | -$3,113 | $839,215 | $0 | $839,215 |
Financial details: 990-PF for the year ended December 31, 2025
Revenue
- Dividends
- $20,703
- Interest
- $7
- Net gain from sales of assets
- $2,452
Expenses
- Grants and similar amounts paid
- $69,000
- Compensation of officers, directors and key employees
- $0
- Disbursements for charitable purposes
- $69,000
- Excise tax on investment income
- $322
Balance sheet and other
- Total assets, start of year
- $888,270
- Total assets, end of year
- $834,883
- Total liabilities, end of year
- $0
- Net assets, end of year
- $834,883
- Fair market value of assets
- $1,655,262
- Qualifying distributions
- $69,000
- Net investment income
- $23,162
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-PF for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| PETER F MATHIESON 103 BRILLIANT AVENUE - SUITE A, PITTSBURGH, PA 15215 | DIRECTOR & PRESIDENT | 1 | $0 |
| ANDREW F MATHIESON 300 DRAKES LANDING ROAD SUITE 250, GREENBRAE, CA 94904 | DIRECTOR & VICE PRESIDENT | 1 | $0 |
| MARGARET M CONVER 15 PASTERN LANE, BLUE BELL, PA 19422 | DIRECTOR & TREASURER/ SECRETARY | 1 | $0 |
990-PF for the year ended December 31, 2024: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| PETER F MATHIESON 103 BRILLIANT AVENUE - SUITE A, PITTSBURGH, PA 15215 | DIRECTOR & PRESIDENT | 1 | $0 |
| ANDREW F MATHIESON 300 DRAKES LANDING ROAD SUITE 250, GREENBRAE, CA 94904 | DIRECTOR & VICE PRESIDENT | 1 | $0 |
| MARGARET M CONVER 15 PASTERN LANE, BLUE BELL, PA 19422 | DIRECTOR & TREASURER/ SECRETARY | 1 | $0 |
990-PF for the year ended December 31, 2023: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| PETER F MATHIESON 103 BRILLIANT AVENUE - SUITE A, PITTSBURGH, PA 15215 | DIRECTOR & PRESIDENT | 1 | $0 |
| ANDREW F MATHIESON 300 DRAKES LANDING ROAD SUITE 250, GREENBRAE, CA 94904 | DIRECTOR & VICE PRESIDENT | 1 | $0 |
| MARGARET M CONVER 15 PASTERN LANE, BLUE BELL, PA 19422 | DIRECTOR & TREASURER/ SECRETARY | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 103 BRILLIANT AVENUE SUITE A, PITTSBURGH, PA 15215-3145
- In care of
- % HELEN F MATHIESON
- Signed the 990-PF
- PETER F MATHIESON, DIRECTOR & PRESIDENT
- Phone
- (412) 963-6160
- Return prepared by
- LOVETT BOOKMAN HARMON MARKS LLP
What it must file and when
IRS records say it files Form 990-PF. Private foundations file every year. 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-PF on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990-PF on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990-PF on file |
IRS record
- EIN
- 20-2502389
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Private non-operating foundation
- Donations deductible (Pub 78)
- Private foundation, 30% limit
- Exempt since
- 2005
- Accounting year ends
- December
- Files
- Form 990-PF
- Category (NTEE)
- Philanthropy, voluntarism and grantmaking foundations (T20)
- Assets (IRS master file)
- $834,883
- Income (IRS master file)
- $390,126
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-PF | December 2025 | $23,162 | $76,549 | $834,883 | XML |
| 990-PF | December 2024 | $118,299 | $72,761 | $888,270 | IRS |
| 990-PF | December 2023 | $74,293 | $77,406 | $839,215 | XML |
| 990-PF | December 2022 | – | – | – | IRS |
| 990-PF | December 2021 | – | – | – | IRS |
| 990-PF | December 2020 | – | – | – | IRS |
| 990-PF | 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 20-2502389).
Questions about MATHIESON FAMILY FOUNDATION
- What is the EIN of MATHIESON FAMILY FOUNDATION?
- The employer identification number (EIN) of MATHIESON FAMILY FOUNDATION is 20-2502389.
- Is MATHIESON FAMILY FOUNDATION tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2005.
- Are donations to MATHIESON FAMILY FOUNDATION tax-deductible?
- Yes. It is listed in IRS Publication 78 (Private foundation, 30% limit).
- Which annual return does MATHIESON FAMILY FOUNDATION file?
- Form 990-PF. Private foundations file every year.
- When is the next return of MATHIESON FAMILY 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 MATHIESON FAMILY FOUNDATION last file with the IRS?
- The latest return in the IRS public files is the 990-PF for the year ended December 2025.
- Who are the officers and directors of MATHIESON FAMILY FOUNDATION?
- The 990-PF for the year ended December 31, 2025 lists 3 people; 0 received compensation from the organization.
- How much revenue does MATHIESON FAMILY FOUNDATION have?
- On its 990-PF for the year ended December 31, 2025 it reported revenue of $23,162, expenses of $76,549 and total assets of $834,883 at year end.
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