Nonprofit · EIN 73-1631943
ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION
Tax-exempt · BOULDER, CO 80302
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990-PF | $41,575 | $42,656 | -$1,081 | $575,364 | $0 | $575,364 |
| December 31, 2024 | 990-PF | $53,482 | $38,593 | $14,889 | $576,445 | $0 | $576,445 |
| December 31, 2023 | 990-PF | $13,033 | $38,569 | -$25,536 | $561,556 | $0 | $561,556 |
Financial details: 990-PF for the year ended December 31, 2025
Revenue
- Dividends
- $32,158
- Interest
- $2
- Net gain from sales of assets
- $9,415
Expenses
- Grants and similar amounts paid
- $40,000
- Compensation of officers, directors and key employees
- $0
- Salaries, compensation and benefits (total)
- $0
- Disbursements for charitable purposes
- $42,656
- Excise tax on investment income
- $94
Balance sheet and other
- Total assets, start of year
- $576,445
- Total assets, end of year
- $575,364
- Total liabilities, end of year
- $0
- Net assets, end of year
- $575,364
- Fair market value of assets
- $848,448
- Qualifying distributions
- $42,656
- Net investment income
- $9,415
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 |
|---|---|---|---|
| Dorothy Kathryn Riddle 700 Grant, Boulder, CO 80302 | 1 | 1 | $0 |
| Christopher Cooper Riddle 13620 Landfair, San Diego, CA 92130 | 1 | 1 | $0 |
| Kathryn Riddle Penzkover 1144 Green Cir, Boulder, CO 80305 | 1 | 1 | $0 |
990-PF for the year ended December 31, 2024: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Dorothy Kathryn Riddle 700 Grant, Boulder, CO 80302 | 1 | 1 | $0 |
| Christopher Cooper Riddle 13620 Landfair, San Diego, CA 92130 | 1 | 1 | $0 |
| Kathryn Riddle Penzkover 1144 Green Cir, Boulder, CO 80305 | 1 | 1 | $0 |
990-PF for the year ended December 31, 2023: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Dorothy Kathryn Riddle 700 Grant Place, Boulder, CO 80302 | President | 1 | $0 |
| Christopher Cooper Riddle 13620 Landfair Rd, San Diego, CA 92130 | Treasurer | 1 | $0 |
| Kathryn Riddle Penzkover 1144 Green Cir, Boulder, CO 80305 | Secretary | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 700 GRANT PL, BOULDER, CO 80302-7413
- In care of
- % DOROTHY RIDDLE
- Signed the 990-PF
- Kathryn Penzkover, Secretary
- Phone
- (720) 425-0251
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
- 73-1631943
- 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
- 2002
- Accounting year ends
- December
- Files
- Form 990-PF
- Category (NTEE)
- Philanthropy, voluntarism and grantmaking foundations (T21)
- Assets (IRS master file)
- $575,364
- Income (IRS master file)
- $124,633
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-PF | December 2025 | $41,575 | $42,656 | $575,364 | IRS |
| 990-PF | December 2024 | $53,482 | $38,593 | $576,445 | XML |
| 990-PF | December 2023 | $13,033 | $38,569 | $561,556 | XML |
| 990-PF | December 2022 | – | – | – | IRS |
| 990-PF | December 2021 | – | – | – | IRS |
| 990-PF | December 2020 | – | – | – | 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 73-1631943).
Questions about ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION
- What is the EIN of ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION?
- The employer identification number (EIN) of ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION is 73-1631943.
- Is ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2002.
- Are donations to ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION tax-deductible?
- Yes. It is listed in IRS Publication 78 (Private foundation, 30% limit).
- Which annual return does ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION file?
- Form 990-PF. Private foundations file every year.
- When is the next return of ANTHONY AND DOROTHY RIDDLE 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 ANTHONY AND DOROTHY RIDDLE 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 ANTHONY AND DOROTHY RIDDLE 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 ANTHONY AND DOROTHY RIDDLE FAMILY FOUNDATION have?
- On its 990-PF for the year ended December 31, 2025 it reported revenue of $41,575, expenses of $42,656 and total assets of $575,364 at year end.
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