Wisconsin · Nonprofit
LITTLEST TUMOR FOUNDATION INC
LITTLEST TUMOR FOUNDATION INC (Wisconsin) receives grants from 7 organizations whose IRS filings report $197,085 to it, the largest being VALLEY KIDS FOUNDATION INC ($93,000). 7 of them have funded it in more than one year.
- Revenue FY2025
- $187k
- Funders on record
- 7
- Grants received
- $197k
- Net assets
- $152k
What Littlest Tumor Foundation Inc does
Mission
Increase understanding of neurofibromatosis (nf), empower affected families, advance research of preventative therapies.
As stated on its FY2025 Form 990-EZ.
Program
Led annual family wellness retreats for the entire family for five days in wisconsin that focused on education, healthy lifestyle and empowering the family unit. Held a five day young adult leadership program.held a four day nf young adult mentorship program.had virtual and an in-person meetings with the nf collective group.held support groups for parents and caregivers with nf.
$115,107 spent100% of program spending
The program described on its FY2024 Form 990-EZ. Program spending in total: $115,107.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2019 to 2020, from $71k to $155k (+118%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
100% of LITTLEST TUMOR FOUNDATION INC’s revenue is contributions — more reliant on donations than three-quarters of its peers (82% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 4 of the last 9 reported years ran a deficit.
Leadership and staff
Chief executive
Tracy Wirtanen
Treasurer & exec director
As listed on its FY2024 Form 990-EZ.
Who funds it, year by year
2017 → 2023: the base broadened from 2 funders to 4 funders, grant income fell $25k → $20k.
1 of 7 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 0% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of LITTLEST TUMOR FOUNDATION INC’s funders (the co-funder graph). Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
LITTLEST TUMOR FOUNDATION INC leans on a few funders — its largest provides 47% of grant income and the top three 83%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
64% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund LITTLEST TUMOR FOUNDATION INC.
Largest funder’s share by year: 2017 60% · 2018 50% · 2019 61% · 2020 53% · 2021 67% · 2022 60% · 2023 51% — diversifying over time.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Where its funders are
62% of LITTLEST TUMOR FOUNDATION INC's grant income comes from Wisconsin funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $85 arriving through sponsors registered in 1 state is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
LITTLEST TUMOR FOUNDATION INC runs a healthier operating margin than half of the 7,883 health nonprofits its size.
this organization peer median middle 50% of peers· 7,883 health nonprofits $100k–$1M, FY2025
Organizations like LITTLEST TUMOR FOUNDATION INC
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Wisconsin
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Public support
41%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 5 states
Screen this organization
A dated, signed PDF of the compliance screen for LITTLEST TUMOR FOUNDATION INC: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds LITTLEST TUMOR FOUNDATION INC?
- LITTLEST TUMOR FOUNDATION INC (Wisconsin) receives grants from 7 organizations whose IRS filings report $197,085 to it, the largest being VALLEY KIDS FOUNDATION INC ($93,000). 7 of them have funded it in more than one year.
- How many funders does LITTLEST TUMOR FOUNDATION INC have?
- IRS filings report 7 organizations giving $197,085 in grants to LITTLEST TUMOR FOUNDATION INC, 7 of which have funded it in more than one year.
- Who is the largest funder of LITTLEST TUMOR FOUNDATION INC?
- VALLEY KIDS FOUNDATION INC is the largest funder on record, with $93,000 in grants. The full list of funders is on this page.
- How can an organization like LITTLEST TUMOR FOUNDATION INC find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Wisconsin. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Littlest Tumor →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 7 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 14, 2026. What this page cannot tell you · view filing