Illinois · Nonprofit
OAK LEYDEN DEVELOPMENTAL SERVICES INC
OAK LEYDEN DEVELOPMENTAL SERVICES INC (Illinois) receives grants from 23 organizations whose IRS filings report $996,832 to it, the largest being WESTLAKE HEALTH FOUNDATION ($385,000). 15 of them have funded it in more than one year.
- Revenue FY2025
- $10M
- Funders on record
- 23
- Grants received
- $997k
- Net assets
- $4.6M
What Oak Leyden Developmental Services Inc does
Mission
To help people with developmental disabilities meet life's challenges and reach their highest potential.
As stated on its FY2025 Form 990.
Programs
The community living services program operates 12 residential community homes for residents with intellectual and developmental disabilities. The homes, known as community integrated living arrangements (or cilas), allow adult participants to enjoy comfort, safety, and community in chicago's near-west suburbs.residents are provided 24-hour support and care that promote personal independence and physical well-being. Each of these accessible, family-like spaces house an average of four residents. Participants are able to grow and live as independently as possible, participating in communities as their neighbors do.in addition, oak-leyden offers intermittent support to adults with developmental disabilities who live on their own in the community. Oak-leyden staff help intermittent cila participants maintain their personal independence by providing the support they need.
$5,598,019 spentof which $100,000 as grants$7,112,262 earned by the program68% of program spendingOur lifelong learning centers provide daily structured programming tailored to meet the cognitve, social, and emotional needs of the 84 participants enrolled in at our oak park location and our elmwood park program. Our programs focus on the developing social skills and interpersonal relationships. We provide participants the opportunity to engage in activities aimed at increasing their involvement in their community while learning life skills. Activities at both sites include advocacy, arts and crafts, music and choir, problem solving, health and wellness, community safety, field trips and numerous celebrations. The ol choir performs in several events in the community.
$1,600,599 spent$1,273,971 earned by the program20% of program spendingOak leyden's children's services programming takes a unique, multi-disciplinary, team approach to facilitate the holistic development of children with developmental disabilities and delays. Oak leyden therapists evaluate children in all areas of development and facilitate individualized therapy that fits the unique needs, challenges, and circumstances of your child. We are family-centric, typically providing services in a child's natural environment and working with caregivers to take advantage of everyday learning opportunities. Oak leyden is the only nonprofit agency in the area providing therapy to children all of these disciplines: developmental, occupational, physical, behavioral, and speech/ language.
$813,358 spent$639,780 earned by the program10% of program spendingOther program services include the supported employment program and clinic.
$176,657 spent$72,999 earned by the program2% of program spending
The 4 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $8,188,633.
The organization over time
Each line starts at 100 in 2019, so what you read is the shape rather than the size: 150 means half as much again as 2019, 50 means half. The number beside each label in the key is where it ended.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2024 to 2025, from $5.2M to $6.7M (+29%).
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.
Government-grant reliance: 2019 9% · 2020 9% · 2021 20% · 2022 8% · 2023 8% · 2024 7% · 2025 4%. Grants only. Government contracts and fees sit inside program revenue.
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 1 of the last 7 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Chief executive
Raymond Mcmahon
CEO
As listed on its FY2025 Form 990.
Who funds it, year by year
2017 → 2023: the base broadened from 3 funders to 12 funders, grant income rose $27k → $220k.
5 of 23 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 8% 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 OAK LEYDEN DEVELOPMENTAL SERVICES 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
OAK LEYDEN DEVELOPMENTAL SERVICES INC leans on a few funders — its largest provides 39% of grant income and the top three 62%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
Largest funder’s share by year: 2017 92% · 2018 55% · 2019 60% · 2020 37% · 2021 45% · 2022 43% · 2023 46% — 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.
How long its funders stay
29% of OAK LEYDEN DEVELOPMENTAL SERVICES INC's funders are still giving 3 years after their first grant; 65% give in more than one year at all.
Share of funders still giving k years after their first recorded grant, pooled across every acquisition cohort. A funder counts as retained in a year only if it made a grant that year. Measured to FY2023, the last fiscal year that has finished arriving — a funder cannot be counted as lapsed in a year most filers have not reached.
Where its funders are
90% of OAK LEYDEN DEVELOPMENTAL SERVICES INC's grant income comes from Illinois funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $83k arriving through sponsors registered in 5 states 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.
Organizations like OAK LEYDEN DEVELOPMENTAL SERVICES 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 Illinois
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
83% of spending goes to programs.
Governance
Public support
92%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for OAK LEYDEN DEVELOPMENTAL SERVICES 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 OAK LEYDEN DEVELOPMENTAL SERVICES INC?
- OAK LEYDEN DEVELOPMENTAL SERVICES INC (Illinois) receives grants from 23 organizations whose IRS filings report $996,832 to it, the largest being WESTLAKE HEALTH FOUNDATION ($385,000). 15 of them have funded it in more than one year.
- How many funders does OAK LEYDEN DEVELOPMENTAL SERVICES INC have?
- IRS filings report 23 organizations giving $996,832 in grants to OAK LEYDEN DEVELOPMENTAL SERVICES INC, 15 of which have funded it in more than one year.
- Who is the largest funder of OAK LEYDEN DEVELOPMENTAL SERVICES INC?
- WESTLAKE HEALTH FOUNDATION is the largest funder on record, with $385,000 in grants. The full list of funders is on this page.
- How can an organization like OAK LEYDEN DEVELOPMENTAL SERVICES INC find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Illinois. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2019–2025), and the filings of 23 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