Anthony and Dorothy Riddle Family Foundation
Anthony and Dorothy Riddle Family Foundation is a private foundation, based in Boulder, CO. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $575K in total assets. In 2025, it awarded 6 grants totaling $40K. Net investment income was $7K.
Anthony and Dorothy Riddle Family Foundation at a glance
In short: Anthony and Dorothy Riddle Family Foundation gave $40K across 6 grants in 2025 (avg $7K), mostly in Colorado. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $40,000
- +8.1% vs 2024
- Grants made (2025)
- 6
- +20.0% vs 2024
- Average grant
- $6,667
- -9.9% vs 2024
- Median grant
- $2,000
- Total assets
- $575,364
- -0.2% vs 2024
- Primary geography
- Colorado (85% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated September 2026.
Who Anthony and Dorothy Riddle Family Foundation funds
How this funder distributes its grants
Top Recipients
Top 5 recipients in 2025
The largest 2025 recipient was University of Colorado Foundation ($30K). Together the top 5 received $38K.
Organizations only. It also paid 1 individual scholarship ($2,000), which are not listed by name.
Grant Size Distribution
24 grants across all recorded years
The most common grant size was under $50K: 24 grants of 24 (100%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 6 itemized grants.
Cities
How Anthony and Dorothy Riddle Family Foundation gives
- Giving held roughly steady from 2022 to 2025 (+11%). Method
- In 2025 it paid out 99% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. Method
From the foundation's IRS Form 990-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2025, annual grant giving ranged from $36K (2020) to $42K (2021). In 2025 it made 6 grants totaling $40K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| University of Colorado Foundation Denver, CO | Scholarships | $30,000 |
| Bechtel International Center Stanford, CA | Encouraging interactions with international visitors | $4,000 |
| 1 individual scholarship Recipients not named | — | $2,000 |
| Colorado Fourteeners Golden, CO | Preserve trails and open spaces for intergenerational interactions | $2,000 |
| International Topical Steroid Awareness Network Dacula, GA | Awareness of TSC | $1,000 |
| Grand Canyon Youth Flagstaff, AZ | Funding for intergenerational interaction with nature | $1,000 |
Ready to take the next step with Anthony and Dorothy Riddle Family Foundation?
Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2025 | $575,364 | $41,575 | $42,656 | $40,000 | 6 | $42,656 | $6,759 | $43,184 |
| 2024 | $576,445 | $53,482 | $38,593 | $37,000 | 5 | $38,593 | $51,887 | $40,162 |
| 2023 | $561,556 | $13,033 | $38,569 | $37,000 | 4 | $38,569 | $22,621 | $36,088 |
| 2022 | $598,249 | $16,515 | $38,590 | $36,000 | 4 | $38,590 | $19,091 | $39,142 |
| 2021 | $620,324 | $62,425 | $44,808 | $42,000 | 5 | $44,808 | $58,985 | $45,352 |
| 2020 | $602,707 | $25,869 | $37,860 | $36,000 | 4 | — | $24,009 | $37,956 |
Under IRS private-foundation payout rules, Anthony and Dorothy Riddle Family Foundation reported a distributable amount of $43K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Anthony and Dorothy Riddle Family Foundation is led by Dorothy Kathryn Riddle, President on every filing since 2020; none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
Dorothy Kathryn Riddle
President
On filings since 2020
1 hr/week
No compensation reported
Christopher Cooper Riddle
Treasurer
On filings since 2020
1 hr/week
No compensation reported
Kathryn Riddle Penzkover
Secretary
On filings since 2020
1 hr/week
No compensation reported
Data from IRS Form 990 filings, 2020–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about Anthony and Dorothy Riddle Family Foundation
How much does Anthony and Dorothy Riddle Family Foundation give each year?
Anthony and Dorothy Riddle Family Foundation gave $40K across 6 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $37K across 5 grants.
What is Anthony and Dorothy Riddle Family Foundation's typical grant size?
Anthony and Dorothy Riddle Family Foundation's median grant in 2025 was $2,000, and its average grant was $6,667, across 6 grants on its 2025 IRS Form 990-PF.
Where does Anthony and Dorothy Riddle Family Foundation give grants?
Anthony and Dorothy Riddle Family Foundation gives mostly in Colorado: 85% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest state was California (10%).
Does Anthony and Dorothy Riddle Family Foundation give general operating support?
Not in 2025: none of the 6 grants with a stated purpose on Anthony and Dorothy Riddle Family Foundation's 2025 IRS Form 990-PF were described as general or operating support.
Who are Anthony and Dorothy Riddle Family Foundation's largest grantees?
Anthony and Dorothy Riddle Family Foundation's largest 2025 grantees include University of Colorado Foundation ($30,000), Bechtel International Center ($4,000) and Colorado Fourteeners ($2,000), according to its 2025 IRS Form 990-PF. It also paid 1 individual scholarship ($2,000), which are not listed by name. Together they received 90% of its itemized 2025 grant dollars.
How large is Anthony and Dorothy Riddle Family Foundation?
Anthony and Dorothy Riddle Family Foundation reported $575K in total assets on its 2025 IRS Form 990-PF. It paid out $43K in qualifying distributions that year, against a required minimum of $43K (roughly 5% of its investment assets). Falling short in one year is not a violation: foundations have until the end of the next year to meet the minimum.
What is Anthony and Dorothy Riddle Family Foundation's EIN?
Anthony and Dorothy Riddle Family Foundation's EIN (Employer Identification Number) is 73-1631943. IRS Form 990 filing data is available on this page for 2020–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(6)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2020 (received by the IRS May 14, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS March 17, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS March 6, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS April 4, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS March 14, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS April 25, 2026)
Explore Open Grants
Browse active grant opportunities in Anthony and Dorothy Riddle Family Foundation's focus areas in our free grants database
Similar Funders
Funders that support many of the same organizations
Gates Family Foundation
Denver, CO
Gates Family Foundation funds public education, natural resources, community development, and informed communities, with a focus on Colorado; capital grants support projects such as construction, renovation, and land acquisition. In 2025, grants ranged from $2,000 to $20 million, with a median of $25,000. It does not accept unsolicited proposals for strategic grants, but qualified Colorado nonprofits can apply for capital grants.
Assets
$423.7M
Grants
374
Total Given
$36.3M
Eastern Bank Foundation
Wakefield, MA
Eastern Bank Foundation supports economic inclusion and mobility, including small businesses, early childhood development, affordable housing, and workforce development. Its 2025 grants ranged from $50 to $2,002,500, with a median of $2,500, primarily in Massachusetts and also in New Hampshire and Rhode Island. It accepts online applications and does not limit giving to preselected organizations.
Assets
$266.7M
Grants
1,786
Total Given
$19.0M
Colorado Gives Foundation
Arvada, CO
Colorado Gives Foundation funds nonprofits serving Jefferson County in areas including food security, early care and education, workforce development, housing, health and convenient neighborhoods; it also offers statewide nonprofit capacity-building support. Typical giving varies widely: its 2024 median grant was $17,814, while Thriving Jeffco Responsive Grant awards ranged from $2,500 to $100,000. It accepts applications through listed grant opportunities, but whether it accepts unsolicited requests is not stated.
Assets
$527.1M
Grants
2,211
Total Given
$91.0M
IBM International Foundation
Armonk, NY
The IBM International Foundation funds education and workforce programs that build 21st-century and technology job skills, including initiatives for underserved students and job seekers. Its 2024 grants ranged from $10,000 to $8.48 million, with a median of $100,000, and went to organizations across several U.S. states, especially Delaware and Massachusetts. It funds only preselected organizations and does not accept unsolicited requests.
Assets
$357.7M
Grants
16
Total Given
$11.7M
The Telluray Foundation
Littleton, CO
The Telluray Foundation supports health, education, arts, human services, parks, and conservation, with most of its giving going to Colorado organizations. In 2024, grants ranged from $2,450 to $500,000, with a median of $35,000. It funds only preselected charitable organizations and does not accept unsolicited requests.
Assets
$72.6M
Grants
51
Total Given
$2.8M
Wright Family Foundation
Boulder, CO
The Wright Family Foundation supports arts and cultural programs, education, historic preservation, and related charitable work, with nearly all 2025 grant dollars going to Colorado organizations. Its 17 grants totaled $180,225, with a median grant of $1,000 and amounts ranging from $225 to $150,000. It funds only preselected organizations and does not accept unsolicited requests.
Assets
$3.0M
Grants
17
Total Given
$180K
More similar funders
More Funders in Colorado
The filing figures on this page are open data under CC BY 4.0. About GrantGraph Open
Figures come from Anthony and Dorothy Riddle Family Foundation's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
Anthony and Dorothy Riddle Family Foundation down — hundreds of funders to go?