Skip to content

California · Nonprofit

OPERATION RAINBOW INC

OPERATION RAINBOW INC (California) receives grants from 21 organizations whose IRS filings report $732,198 to it, the largest being Richmon Family Foundation ($190,000). 8 of them have funded it in more than one year.

Revenue FY2025
$713k
Funders on record
21
Grants received
$732k
Net assets
$701k
8/21 repeat funderspeak grant-dependency 36%
01What it does

What Operation Rainbow Inc does

Mission

To provide volunteer health care services to medically underserved countries.

As stated on its FY2025 Form 990.

Program

  1. Organizes, funds, & oversees volunteer health care teams that provide reconstructive surgery to indigent patients; over 240 patients were seen and 280 surgeries were performed in the four underserved countries of armenia (1 missions); ecuador (1 mission); honduras (2 missions) and guatemala (1 mission) in the fiscal year ended 6/30/2025.

    $394,171 spent
    100% of program spending

The program described on its FY2024 Form 990. Program spending in total: $394,171.

02The organization over time

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.

100 = 20172017 Revenue 100 ($590k) Expenses 100 ($673k) Net assets 100 ($397k)2018 Revenue 104 ($615k) Expenses 96 ($644k) Net assets 93 ($368k)2019 Revenue 107 ($632k) Expenses 93 ($626k) Net assets 94 ($374k)2020 Revenue 98 ($581k) Expenses 83 ($557k) Net assets 100 ($397k)2021 Revenue 60 ($352k) Expenses 22 ($148k) Net assets 151 ($601k)2022 Revenue 36 ($215k) Expenses 22 ($145k) Net assets 169 ($671k)2023 Revenue 56 ($331k) Expenses 70 ($469k) Net assets 134 ($533k)2024 Revenue 70 ($410k) Expenses 68 ($457k) Net assets 122 ($486k)2025 Revenue 121 ($713k) Expenses 74 ($498k) Net assets 177 ($701k)
'17'18'19'20'21'22'23'24'25
Revenue (121)Expenses (74)Net assets (177)

Balance sheet

Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2020 to 2021, from $418k to $601k (+44%).

$434k
$385k
$416k
$418k
$601k
$684k
$543k
$532k
$706k
'17'18'19'20'21'22'23'24'25
Total assetsTotal liabilities

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.

2017
2018
2019
2020
2021
2022
2023
2024
2025
ContributionsProgram revenueInvestmentOther

Surplus & reserves

Operating surplus or deficit each year, and months of liquidity in hand. 4 of the last 9 reported years ran a deficit.

−$83k
’17
−$29k
’18
$6k
’19
$23k
’20
$204k
’21
$70k
’22
−$137k
’23
−$47k
’24
$215k
’25
17
months of
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

Michelle Duncan-Lowenberg

Executive director

Board chair

Gus Gialamas Md

Director/chairman

As listed on its FY2025 Form 990.

The chief executive listed changed between the FY2017 and FY2018 filings.

'17'18'19'20'21'22'23'24'25
Listed888888888
Joined·+1+0+0+0+0+0+0+0
No longer listed·10000000
03Who funds it

Who funds it, year by year

2017 → 2023: the base broadened from 5 funders to 8 funders, grant income fell $90k → $84k.

8 of 21 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 16% 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 OPERATION RAINBOW 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

OPERATION RAINBOW INC leans on a few funders — its largest provides 26% of grant income and the top three 64%; half comes from just 2 funders.

the vertical line marks half of all grant income — 2 funders to its left

54% 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 OPERATION RAINBOW INC.

26%
largest funder
64%
top three
~6
effective funders

Largest funder’s share by year: 2017 49% · 2018 47% · 2019 67% · 2020 21% · 2021 25% · 2022 62% · 2023 32% — 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

36% of OPERATION RAINBOW INC's funders are still giving 3 years after their first grant; 38% give in more than one year at all.

first grant+1y+2y+3y+4y+5y+6y

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

OPERATION RAINBOW INC draws 51% of its grant income from funders outside California, across 6 states in all.

WA
IL
NY
CA
DE
FL

In-state vs out-of-state, by year

’17
’18
’19
’20
’21
’22
’23
California out of state home

Funder states come from each funder’s own filing. $119k arriving through sponsors registered in 8 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.

04Its place in the field

Organizations like OPERATION RAINBOW 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

05Profile & governance

Read directly from this organization’s own Form 990, as neutral context.

Where the money goes

79% of spending goes to programs.

Program 79%Management 14%Fundraising 7%

Governance

8
board members
88%
independent
–Conflict-of-interest policy–Whistleblower policy–Document retention✓Board reviewed the 990–Audited financials

Public support

100%

Share of support from the public (Schedule A) — the basis for its public-charity status.

Footprint & structure

Files a return copy in 1 state

CA

Screen this organization

A dated, signed PDF of the compliance screen for OPERATION RAINBOW 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.

A paid feature, included from the $75 plan up. Sign in to download.

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 OPERATION RAINBOW INC?
OPERATION RAINBOW INC (California) receives grants from 21 organizations whose IRS filings report $732,198 to it, the largest being Richmon Family Foundation ($190,000). 8 of them have funded it in more than one year.
How many funders does OPERATION RAINBOW INC have?
IRS filings report 21 organizations giving $732,198 in grants to OPERATION RAINBOW INC, 8 of which have funded it in more than one year.
Who is the largest funder of OPERATION RAINBOW INC?
Richmon Family Foundation is the largest funder on record, with $190,000 in grants. The full list of funders is on this page.
How can an organization like OPERATION RAINBOW 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 Operation Rainbow →

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 21 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