California · Nonprofit
ONeill Sea Odyssey
ONeill Sea Odyssey (California) receives grants from 28 organizations whose IRS filings report $2,917,921 to it, the largest being DONOR ADVISED CHARITABLE GIVING INC ($1,502,017). 22 of them have funded it in more than one year, and 74% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2025
- $1.0M
- Funders on record
- 28
- Grants received
- $2.9M
- Net assets
- $4.7M
What ONeill Sea Odyssey does
Mission
Org's Mission: (i) to promote awareness of the Monterey Bay eco-systems and its adjoining areas; (ii) to conduct educational field trips; (iii) to instill in youth and adults a desire to perform community service to improve and preserve the ecology of the ocean environment.
As stated on its FY2025 Form 990.
Program
The corporation is formed for the following purposes: (i) to generally promote and foster local, national and international awareness of the eco-systems of the Monterey Bay and its adjoining areas; (ii) to promote, organize, manage and conduct educational field trips to promote such awareness; (iii) to encourage and instill in youth and adults a desire to perform community service aimed at improving and preserving the ecology of the ocean environment.During the fiscal year ended June 30, 2025, in order to keep an accurate count of each presentation offered, OSO staff recorded each scheduled class given on a google spreadsheet. Some teachers only participated in one, one-hour distance learning program, while other teachers participated in multiple one-hour distance learning programs. For the sake of recording our work accurately, one program is equal to one class of students. The total number of students is counted by keeping track of the number of students participating in each one-hour distance learning program. Some students received only one hour of instruction, while others received up to 10 hours of instruction from OSO staff. Total count of students tallied in this way was…
$993,396 spent100% of program spending
The program described on its FY2024 Form 990. Program spending in total: $993,396.
The organization over time
Each line starts at 100 in 2018, so what you read is the shape rather than the size: 150 means half as much again as 2018, 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 2024 to 2025, from $4.1M to $5.3M (+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: 2018 12% · 2019 18% · 2020 19% · 2021 10% · 2023 13% · 2024 35% · 2025 14%. Grants only. Government contracts and fees sit inside program revenue.
88% of ONeill Sea Odyssey’s revenue is contributions — more donation-reliant than the typical peer (88% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 3 of the last 8 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
Tracey Weiss
Exec. Director
Board chair
Bridget O'Neill
Chair
As listed on its FY2025 Form 990.
The chief executive listed changed between the FY2020 and FY2021, and between the FY2021 and FY2022 filings.
Who funds it, year by year
2017 → 2023: the base narrowed from 13 funders to 11 funders, grant income fell $789k → $285k.
8 of 28 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 74% 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 ONeill Sea Odyssey’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
ONeill Sea Odyssey leans on a few funders — its largest provides 51% of grant income and the top three 73%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
81% 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 ONeill Sea Odyssey.
Largest funder’s share by year: 2017 67% · 2018 76% · 2019 42% · 2020 46% · 2021 86% · 2022 51% · 2023 36% — 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 ONeill Sea Odyssey's funders are still giving 3 years after their first grant; 79% 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
74% of ONeill Sea Odyssey's grant income arrives through donor-advised or pass-through sponsors, whose addresses record where the money is held rather than where the donor is. Of the $764k that is directly attributable, 98% of it comes from California funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $2.2M 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.
Against its field
ONeill Sea Odyssey holds deeper cash reserves than three-quarters of the 1,074 environment nonprofits its size.
this organization peer median middle 50% of peers· 1,074 environment nonprofits $1M–$10M, FY2025
Organizations like ONeill Sea Odyssey
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
Public support
59%
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 ONeill Sea Odyssey: 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 ONeill Sea Odyssey?
- ONeill Sea Odyssey (California) receives grants from 28 organizations whose IRS filings report $2,917,921 to it, the largest being DONOR ADVISED CHARITABLE GIVING INC ($1,502,017). 22 of them have funded it in more than one year, and 74% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does ONeill Sea Odyssey have?
- IRS filings report 28 organizations giving $2,917,921 in grants to ONeill Sea Odyssey, 22 of which have funded it in more than one year.
- Who is the largest funder of ONeill Sea Odyssey?
- DONOR ADVISED CHARITABLE GIVING INC is the largest funder on record, with $1,502,017 in grants. The full list of funders is on this page.
- How can an organization like ONeill Sea Odyssey 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 ONeill Sea Odyssey →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2018–2025), and the filings of 28 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