One Mission Inc
One Mission is a pediatric cancer charity founded in 2008 by Ashley and Ari Haseotes after their son was diagnosed with leukemia. The organization brings joy, hope, comfort, and support to children fighting cancer and their families through in-hospital programming, arts and music therapy, celebration events, and practical support such as paying for hospital parking. Since its founding, One Mission has helped over 36,000 families navigate childhood cancer, providing support from diagnosis through treatment and beyond.
One Mission Inc at a glance
In short: One Mission Inc gave $663K across 6 grants in 2024 (avg $111K), mostly in Massachusetts. Source: 2024 IRS Form 990.
- Annual giving (2024)
- $663,287
- +3.8% vs 2023
- Grants made (2024)
- 6
- +20.0% vs 2023
- Average grant
- $110,548
- -13.5% vs 2023
- Median grant
- $37,500
- Total assets
- $1,234,760
- -5.7% vs 2023
- Primary geography
- Massachusetts (89% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990, 2024 View filing
Data from IRS Form 990, 2024; updated October 2026.
Who One Mission Inc funds
How this funder distributes its grants
Top Recipients
Top 6 recipients in 2024
The largest 2024 recipient was Boston Children's Hospital ($468K). Together the top 6 received $663K.
Grant Size Distribution
26 grants across all recorded years
The most common grant size was under $50K: 14 grants of 26 (54%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2024 grant dollars across all 6 itemized grants.
Cities
How One Mission Inc gives
- Giving held roughly steady from 2021 to 2024 (+12%). Method
From the foundation's IRS Form 990 filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2024, annual grant giving ranged from $525K (2020) to $747K (2022). In 2024 it made 6 grants totaling $663K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Boston Children's Hospital Boston, MA | Services for Pediatric Cancer Patients & Families | $468,287 |
| Dana-Farber Cancer Institute Brookline, MA | Services for Pediatric Cancer Patients & Families | $75,000 |
| Rett's Roost Ogunquit, ME | Services for Pediatric Cancer Patients & Families | $40,000 |
| Camp Casco Sudbury, MA | Services for Pediatric Cancer Patients & Families | $35,000 |
| Hasbro Children's Hospital Providence, RI | Services for Pediatric Cancer Patients & Families | $30,000 |
| New England Patriots Foundation Foxborough, MA | Buzz Off Partnership | $15,000 |
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Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Net Investment Income |
|---|---|---|---|---|---|---|
| 2024 | $1,234,760 | $1,631,350 | $1,537,193 | $663,287 | 6 | $26,120 |
| 2023 | $1,310,089 | $1,467,377 | $1,434,531 | $639,187 | 5 | $7,104 |
| 2022 | $1,313,795 | $1,485,226 | $1,426,609 | $746,917 | 6 | $2,385 |
| 2021 | $1,071,160 | $931,706 | $1,057,022 | $594,689 | 5 | $1,550 |
| 2020 | $1,179,033 | $1,114,329 | $918,548 | $525,160 | 4 | — |
About One Mission Inc
Based on IRS filings
One Mission Inc is a public charity focused on Health, based in Newton, MA. IRS filing data is available from 2020 through 2024. As of 2024, the organization holds $1.2M in total assets. In 2024, it awarded 6 grants totaling $663K. Net investment income was $26K.
Focus Areas
Leadership & Key People
Officers and directors from IRS filings
One Mission Inc is led by Ashley Haseotes, President & Director on every filing since 2020; 2 of 6 officers listed in 2024 are compensated.
Officers on the 2024 filing
Ashley Haseotes
President & Director
On filings since 2020
20 hrs/week
$7K (2024)
Abby Pastyrnak
Managing Director
On filings since 2022
40 hrs/week
$114K (2022) → $138K (2024)
Melissa Rees
Director & Director of Marketing
Director → Director of Marketing & Director, 2022
On filings since 2020
20 hrs/week
$16K (2020) → $0 (2024)
Ari Haseotes
Vice President & Director
Director → Vice President & Director, 2022
On filings since 2020
4 hrs/week
No compensation reported
David Blouin
Treasurer & Director
On filings since 2020
1 hr/week
No compensation reported
Gina M. Deacetis Powers
Clerk & Director
On filings since 2020
1 hr/week
No compensation reported
Former officers (2)
- Former: Erika Siegal (2020–2023) — Director
- Former: Abby Porosky (2020–2021) — Managing Director
Data from IRS Form 990 filings, 2020–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Compensation Overview
From 2024 IRS filing
The highest reported compensation on the 2024 filing was $138K, to Abby Pastyrnak (Managing Director). 2 officers or directors reported compensation on that filing.
Frequently asked questions about One Mission Inc
How much does One Mission Inc give each year?
One Mission Inc gave $663K across 6 grants in 2024, according to its 2024 IRS Form 990. In 2023 it gave $639K across 5 grants.
What is One Mission Inc's typical grant size?
One Mission Inc's median grant in 2024 was $37,500, and its average grant was $110,548, across 6 grants on its 2024 IRS Form 990.
Where does One Mission Inc give grants?
One Mission Inc gives mostly in Massachusetts: 89% of the grant dollars itemized on its 2024 IRS Form 990 went to recipients there. The next largest state was Maine (6%).
Does One Mission Inc give general operating support?
Not in 2024: none of the 6 grants with a stated purpose on One Mission Inc's 2024 IRS Form 990 were described as general or operating support. Recurring purposes include "Services for Pediatric Cancer Patients & Families" (5 grants).
Who are One Mission Inc's largest grantees?
One Mission Inc's largest 2024 grantees include Boston Children's Hospital ($468,287), Dana-Farber Cancer Institute ($75,000) and Rett's Roost ($40,000), according to its 2024 IRS Form 990. Together they received 88% of its itemized 2024 grant dollars.
How large is One Mission Inc?
One Mission Inc reported $1.2M in total assets on its 2024 IRS Form 990. Its revenue that year was $1.6M.
What is One Mission Inc?
One Mission Inc is a public charity focused on Health, based in Newton, MA. It holds $1.2M in total assets as of 2024.
What is One Mission Inc's EIN?
One Mission Inc's EIN (Employer Identification Number) is 26-3741880. IRS Form 990 filing data is available on this page for 2020–2024.
Data last updated October 2026. Sourced from IRS Form 990 filings.
Data update history
(6)
When this profile's IRS filing data changed on Grantable
- Updated Form 990 for fiscal year 2020 (received by the IRS November 15, 2021)
- Updated Form 990 for fiscal year 2021 (received by the IRS September 19, 2022)
- Updated Form 990 for fiscal year 2022 (received by the IRS November 15, 2023)
- Updated Form 990 for fiscal year 2023 (received by the IRS November 14, 2024)
- Updated Form 990 for fiscal year 2024 (received by the IRS October 21, 2025)
- IRS filings on file for fiscal years 2020–2024
Live grants for the work One Mission Inc funds
Health Open opportunities, soonest deadline first.
Explore Open Grants
Browse active grant opportunities in One Mission Inc's focus areas in our free grants database
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One Mission Inc down — hundreds of funders to go?