California · Nonprofit
STEM PREPARATORY SCHOOLS INC
STEM PREPARATORY SCHOOLS INC (California) receives grants from 12 organizations whose IRS filings report $3,007,766 to it, the largest being GATES FOUNDATION ($1,616,571). 7 of them have funded it in more than one year.
- Revenue FY2025
- $27M
- Funders on record
- 12
- Grants received
- $3.0M
- Net assets
- $17M
What STEM Preparatory Schools Inc does
Mission
Operate a small network of high performing schools, in a targeted area of los angeles; develop tk-12th grade scholars into successful college graduates and professionals, through equal access and inspiration, rigorous curriculum, and a commitment to our core values.
As stated on its FY2025 Form 990.
Program
Operation of three (3) public charter schools in the west adams and jefferson park neighborhoods of south la:-stem prep elementary school serving grades tk to 5-crown preparatory academy serving grades 5 to 8-math & science college prep serving grades 9 to 12the vision of stem prep schools is to create a kindergarten through college pipeline of individuals who will transform their community by closing the socio-economic, ethnic, and gender gaps in stem fields, and serving as role models who exhibit scholarliness, advocacy, perseverance, and kindness.
$21,691,523 spentof which $18,000 as grants$49,345 earned by the program100% of program spending
The program described on its FY2024 Form 990. Program spending in total: $21,691,523.
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 2022 to 2023, from $18M to $38M (+106%).
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: 2017 97% · 2018 94% · 2019 99% · 2020 96% · 2021 96% · 2022 99% · 2023 98% · 2024 98% · 2025 97%. Grants only. Government contracts and fees sit inside program revenue.
98% of STEM PREPARATORY SCHOOLS INC’s revenue is contributions — more reliant on donations than three-quarters of its peers (23% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 0 of the last 9 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
Emilio Pack
Chief executive officer
Board chair
Carmen Vazquez
Chair
As listed on its FY2025 Form 990.
Who funds it, year by year
2017 → 2023: the base narrowed from 3 funders to 1 funder, grant income rose $37k → $100k.
3 of 12 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 2% 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 STEM PREPARATORY SCHOOLS INC’s funders (the co-funder graph). Top 11 of 12 funders by total. 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
STEM PREPARATORY SCHOOLS INC leans on a few funders — its largest provides 54% of grant income and the top three 88%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
39% 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 STEM PREPARATORY SCHOOLS INC.
Largest funder’s share by year: 2017 54% · 2018 59% · 2019 51% · 2020 80% · 2021 100% · 2022 100% · 2023 100% — growing more concentrated.
“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
9% of STEM PREPARATORY SCHOOLS INC's funders are still giving 3 years after their first grant; 58% 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
STEM PREPARATORY SCHOOLS INC draws 74% of its grant income from funders outside California, across 5 states in all.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $58k arriving through sponsors registered in 2 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.
Against its field
STEM PREPARATORY SCHOOLS INC holds deeper cash reserves than three-quarters of the 3,758 education nonprofits its size.
this organization peer median middle 50% of peers· 3,758 education nonprofits $10M–$100M, FY2025
Organizations like STEM PREPARATORY SCHOOLS 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 California
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
80% of spending goes to programs.
Governance
Footprint & structure
Files a return copy in 1 state
Part of a family of 1 related entity
- 3200 Adams Holding Corp · exempt
Screen this organization
A dated, signed PDF of the compliance screen for STEM PREPARATORY SCHOOLS 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 STEM PREPARATORY SCHOOLS INC?
- STEM PREPARATORY SCHOOLS INC (California) receives grants from 12 organizations whose IRS filings report $3,007,766 to it, the largest being GATES FOUNDATION ($1,616,571). 7 of them have funded it in more than one year.
- How many funders does STEM PREPARATORY SCHOOLS INC have?
- IRS filings report 12 organizations giving $3,007,766 in grants to STEM PREPARATORY SCHOOLS INC, 7 of which have funded it in more than one year.
- Who is the largest funder of STEM PREPARATORY SCHOOLS INC?
- GATES FOUNDATION is the largest funder on record, with $1,616,571 in grants. The full list of funders is on this page.
- How can an organization like STEM PREPARATORY SCHOOLS INC find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in California. 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 STEM Preparatory Schools →
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 12 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