Texas · Nonprofit
ST MARK'S SCHOOL OF TEXAS
ST MARK'S SCHOOL OF TEXAS (Texas) receives grants from 123 organizations whose IRS filings report $61,784,299 to it, the largest being THE ZIERK FAMILY FOUNDATION ($13,000,000). 92 of them have funded it in more than one year.
- Revenue FY2025
- $46M
- Funders on record
- 123
- Grants received
- $62M
- Net assets
- $378M
What St Mark's School of Texas does
Mission
St. Mark's school of texas is a private, non-profit, non-sectarian, independent, college preparatory day school for boys grades 1 through 12. The school aims to afford its students well-rounded physical, intellectual, and spiritual education.
As stated on its FY2025 Form 990.
Programs
Instructional grades 1 through 12 - st. Mark's school of texas is a private, non-profit, non-sectarian, independent, college preparatory day school for boys in grades 1 through 12. The school aims to afford its students well-rounded physical, intellectual, and spiritual education. The school is located in dallas, texas, and has an approximate enrollment of 915 boys.
$41,233,747 spentof which $4,140,687 as grants$32,848,092 earned by the program96% of program spendingStudent activities - wide ranging expenses related to noninstructional activities of students including commencement exercises, student council expenses, and class field trips.
$924,330 spent$718,891 earned by the program2% of program spendingNew student admission fees - expenses related to the matriculationof students to the school.
$890,966 spent$219,700 earned by the program2% of program spendingExtended day - after school care for boys in grades 1 through 4. The program has an enrollment of approximately 60 boys.
$96,746 spent$172,477 earned by the program0% of program spending
The 4 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $43,145,789.
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 $323M to $367M (+13%).
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.
18% of ST MARK'S SCHOOL OF TEXAS’s revenue is contributions — about as donation-reliant as the typical peer (23% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 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.
Who funds it, year by year
2017 → 2023: the base broadened from 34 funders to 66 funders, grant income rose $6.3M → $6.8M.
26 of 123 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 29% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
Left out of every figure on this page: $100k from one payer (an institutional transfer, not a grant programme, largest The Rory and Howard Meyers Family Foundation). These are real filings, and they are not money ST MARK'S SCHOOL OF TEXAS raised.
From the IRS filings of ST MARK'S SCHOOL OF TEXAS’s funders (the co-funder graph). Top 30 of 123 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
ST MARK'S SCHOOL OF TEXAS has a broad base — no single funder exceeds 21% of grant income, and it takes 4 funders to reach half.
the vertical line marks half of all grant income — 4 funders to its left
29% 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 ST MARK'S SCHOOL OF TEXAS.
Largest funder’s share by year: 2017 39% · 2018 74% · 2019 17% · 2020 24% · 2021 55% · 2022 56% · 2023 30% — 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
56% of ST MARK'S SCHOOL OF TEXAS's funders are still giving 3 years after their first grant; 75% 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
95% of ST MARK'S SCHOOL OF TEXAS's grant income comes from Texas funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $18M arriving through sponsors registered in 15 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
ST MARK'S SCHOOL OF TEXAS holds deeper cash reserves than three-quarters of the 3,794 education nonprofits its size.
this organization peer median middle 50% of peers· 3,794 education nonprofits $10M–$100M, FY2025
Organizations like ST MARK'S SCHOOL OF TEXAS
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 Texas
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
43%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Screen this organization
A dated, signed PDF of the compliance screen for ST MARK'S SCHOOL OF TEXAS: 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 ST MARK'S SCHOOL OF TEXAS?
- ST MARK'S SCHOOL OF TEXAS (Texas) receives grants from 123 organizations whose IRS filings report $61,784,299 to it, the largest being THE ZIERK FAMILY FOUNDATION ($13,000,000). 92 of them have funded it in more than one year.
- How many funders does ST MARK'S SCHOOL OF TEXAS have?
- IRS filings report 123 organizations giving $61,784,299 in grants to ST MARK'S SCHOOL OF TEXAS, 92 of which have funded it in more than one year.
- Who is the largest funder of ST MARK'S SCHOOL OF TEXAS?
- THE ZIERK FAMILY FOUNDATION is the largest funder on record, with $13,000,000 in grants. The full list of funders is on this page.
- How can an organization like ST MARK'S SCHOOL OF TEXAS find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Texas. 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 St Mark's School of Texas →
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 123 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 22, 2026. What this page cannot tell you · view filing