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Nonprofit · EIN 84-4765097

OKLAHOMA PROTON FOUNDATION

Tax-exempt · OKLAHOMA CITY, OK 73142

Financials

$28M$31.4M2023$28.9M$32.4M2024$34.4M$35.8M2025
Revenue Expenses · by fiscal year end
Financials of OKLAHOMA PROTON FOUNDATION by year, from its e-filed returns
Year endedFormRevenueExpensesNet incomeTotal assetsLiabilitiesNet assets
December 31, 2025990$34,389,036$35,764,784-$1,375,748$83,335,626$91,187,744-$7,852,118
December 31, 2024990$28,894,386$32,372,725-$3,478,339$81,059,386$87,662,078-$6,602,692
December 31, 2023990$27,970,398$31,399,767-$3,429,369$83,206,043$86,497,448-$3,291,405
Financial details: 990 for the year ended December 31, 2025

Revenue

Contributions, gifts and grants
$0
Program service revenue
$33,801,696
Investment income
$465,628
Net gain from sales of assets
-$158,679
Other revenue
$121,712

Expenses

Grants and similar amounts paid
$0
Other salaries and wages
$6,678,025
Salaries, compensation and benefits (total)
$6,678,025
Professional fundraising fees
$0
Depreciation
$3,628,775
Program services (functional)
$31,011,377
Management and general (functional)
$4,753,407

Balance sheet and other

Total assets, start of year
$81,059,386
Total assets, end of year
$83,335,626
Total liabilities, end of year
$91,187,744
Net assets, end of year
-$7,852,118
Land, buildings and equipment
$53,555,695
Net assets without donor restrictions
-$7,852,118
Gross receipts
$34,547,715
Employees
83
Volunteers
1
Year formed
2021
State of legal domicile
OK

From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.

Officers, directors and key employees

As listed on the 990 for the year ended December 31, 2025, highest compensation first.

NameTitleHours / weekCompensation
Anna StidhamRadiologist
Key employee
40$396,714
Yi LeDirector of Physics
Key employee
40$274,841
Thanh NguyenPhysicist
Key employee
40$198,535
Randall JohnsonDosimetry Manager
Key employee
40$171,286
Ying FengDosimetrist
Key employee
40$163,121
G Richard FransenChair
Trustee or director, Officer
0.5$3,750
Les FoutTreasurer
Trustee or director, Officer
0.5$3,750
Rodney BakerSecretary
Trustee or director, Officer
0.5$3,750
Gary BridwellBoard Member
Trustee or director
0.5$3,750
Nicholas J SamarripasBoard Member
Trustee or director
0.5$3,750
Steve RowleyBoard Member
Trustee or director
0.5$3,750
990 for the year ended December 31, 2024: 11 people
NameTitleHours / weekCompensation
Yi LeDirector of Physics
Key employee
40$252,718
Levi GarrettFormer Physicist
Former
40$195,452
Thanh NguyenPhysicist
Key employee
40$170,503
Randall JohnsonDosimetry Manager
Key employee
40$165,047
Ying FengDosimetrist
Key employee
40$153,699
G Richard FransenChair
Trustee or director, Officer
0.5$6,250
Les FoutTreasurer
Trustee or director, Officer
0.5$6,250
Rodney BakerSecretary
Trustee or director, Officer
0.5$6,250
Gary BridwellBoard Member
Trustee or director
0.5$6,250
Nicholas J SamarripasBoard Member
Trustee or director
0.5$6,250
Steve RowleyBoard Member
Trustee or director
0.5$6,250
990 for the year ended December 31, 2023: 11 people
NameTitleHours / weekCompensation
Yi LeDirector of Physics
Key employee
40$239,879
Jennifer WashingtonVP of Operations
Officer
40$172,046
Randall JohnsonDosimetry Manager
Key employee
40$160,673
Ryan CrawfordVP of Administration
Key employee
40$147,861
Clayton R AustDosimetrist
Key employee
40$131,936
G Richard FransenChair
Trustee or director, Officer
1$6,250
Les FoutTreasurer
Trustee or director, Officer
1$6,250
Rodney BakerSecretary
Trustee or director, Officer
1$5,000
Gary BridwellBoard Member
Trustee or director
1$5,000
Nicholas J SamarripasBoard Member
Trustee or director
1$5,000
Steve RowleyBoard Member
Trustee or director
1$5,000

Address and contacts

Address (IRS master file)
5901 W MEMORIAL RD, OKLAHOMA CITY, OK 73142-2015
Principal officer (990 for 2025)
G Richard Fransen, 5901 West Memorial Road, Oklahoma City, OK 73142
Signed the 990
G Richard Fransen, Board Chair
Phone
(415) 984-9804
Return prepared by
Elliott Advisory Group PLLC

Mission

To acquire and operate an advanced proton therapy treatment center located in Oklahoma City, Oklahoma.

990 for the year ended December 31, 2025

Program accomplishments

  • The Oklahoma Proton Center, LLC, wholly owned by the Foundation, is a cancer center that has successfully treated thousands of patients from all over the United States and from fifteen different countries. Its doctors have experience treating patients with a wide variety of conditions, including breast cancer, lung cancer, prostate cancer, head and neck cancer, pediatric cancers, liver cancer, esophageal cancer and many other diagnoses. The facility features four treatment rooms with advanced in-room imaging capabilities.
    Expenses $31,011,377 · revenue $33,643,017

What it must file and when

IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025December 31, 2025May 15, 2026990 on file
2024December 31, 2024May 15, 2025990 on file
2023December 31, 2023May 15, 2024990 on file

IRS record

EIN
84-4765097
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Hospital or medical research organization
Donations deductible (Pub 78)
Public charity, 50% deduction limit
Exempt since
2020
Accounting year ends
December
Files
Form 990 or 990-EZ
Category (NTEE)
Health care (E24)
Assets (IRS master file)
$83,335,626
Income (IRS master file)
$34,547,715

Filing history

FormYear endedRevenueExpensesAssetsReturn
990December 2025$34,389,036$35,764,784$83,335,626XML
990December 2024$28,894,386$32,372,725$81,059,386XML
990December 2023$27,970,398$31,399,767$83,206,043XML
990December 2022$24,408,997$28,741,766$84,927,274IRS
990December 2021–––IRS

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 84-4765097).

Questions about OKLAHOMA PROTON FOUNDATION

What is the EIN of OKLAHOMA PROTON FOUNDATION?
The employer identification number (EIN) of OKLAHOMA PROTON FOUNDATION is 84-4765097.
Is OKLAHOMA PROTON FOUNDATION tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2020.
Are donations to OKLAHOMA PROTON FOUNDATION tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does OKLAHOMA PROTON FOUNDATION file?
Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
When is the next return of OKLAHOMA PROTON FOUNDATION due?
The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did OKLAHOMA PROTON FOUNDATION last file with the IRS?
The latest return in the IRS public files is the 990 for the year ended December 2025.
Who is the principal officer of OKLAHOMA PROTON FOUNDATION?
The 990 for the year ended December 31, 2025 names G Richard Fransen.
Who are the officers and directors of OKLAHOMA PROTON FOUNDATION?
The 990 for the year ended December 31, 2025 lists 11 people; 11 received compensation from the organization, the highest $396,714 (Anna Stidham, Radiologist).
How much revenue does OKLAHOMA PROTON FOUNDATION have?
On its 990 for the year ended December 31, 2025 it reported revenue of $34,389,036, expenses of $35,764,784 and total assets of $83,335,626 at year end.

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