Nonprofit · EIN 94-3228007
THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS
Tax-exempt · SAN FRANCISCO, CA 94123
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $1,179,055 | $1,582,110 | -$403,055 | $1,149,057 | $115,416 | $1,033,641 |
| December 31, 2024 | 990 | $1,284,648 | $1,621,543 | -$336,895 | $1,471,651 | $22,809 | $1,448,842 |
| December 31, 2023 | 990 | $1,532,996 | $1,459,434 | $73,562 | $1,825,083 | $39,428 | $1,785,655 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $1,086,615
- of which government grants
- $10,000
- Program service revenue
- $74,900
- Investment income
- $17,540
- Other revenue
- $0
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $487,231
- Other salaries and wages
- $286,715
- Salaries, compensation and benefits (total)
- $843,616
- Professional fundraising fees
- $145,000
- Legal fees
- $15,413
- Accounting fees
- $62,905
- Occupancy
- $33,090
- Depreciation
- $2,699
- Program services (functional)
- $1,157,397
- Management and general (functional)
- $123,875
- Fundraising (functional)
- $300,838
Balance sheet and other
- Total assets, start of year
- $1,471,651
- Total assets, end of year
- $1,149,057
- Total liabilities, end of year
- $115,416
- Net assets, end of year
- $1,033,641
- Land, buildings and equipment
- $5,602
- Publicly traded securities
- $87,925
- Net assets without donor restrictions
- $1,033,641
- Gross receipts
- $1,179,055
- Employees
- 7
- Year formed
- 1995
- State of legal domicile
- CA
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.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| Kevin R Stone MD | Chairman Trustee or director, Officer | 40 | $250,000 | $0 |
| Mani Vessal | Dir Research & Ops | 40 | $223,539 | $13,692 |
| Simaron Dhillon | Research Prgm Mgr | 40 | $106,289 | $0 |
| Mark Bailey | Director Trustee or director | 3 | $0 | $0 |
| Jennifer Brinkley | Director Trustee or director | 3 | $0 | $0 |
| Tim Strickler | Director Trustee or director | 3 | $0 | $0 |
| Greg Widroe | Director Trustee or director | 3 | $0 | $0 |
990 for the year ended December 31, 2024: 6 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Kevin R Stone MD | Chairman Trustee or director, Officer | 40 | $250,000 |
| Mani Vessal | Dir Research & Ops | 40 | $211,684 |
| Mark Bailey | Director Trustee or director | 3 | $0 |
| Jennifer Brinkley | Director Trustee or director | 3 | $0 |
| Tim Strickler | Director Trustee or director | 3 | $0 |
| Greg Widroe | Director Trustee or director | 3 | $0 |
990 for the year ended December 31, 2023: 6 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Kevin R Stone MD | Chairman Trustee or director, Officer | 40 | $246,314 |
| Mani Vessal | Dir Research & Ops | 40 | $159,489 |
| Mark Bailey | Director Trustee or director | 3 | $0 |
| Jennifer Brinkley | Director Trustee or director | 3 | $0 |
| Christine Hartley | Director Trustee or director | 3 | $0 |
| Greg Widroe | Director Trustee or director | 3 | $0 |
Address and contacts
- Address (IRS master file)
- 3727 BUCHANAN ST STE 310, SAN FRANCISCO, CA 94123-1779
- In care of
- % DR KEVIN R STONE PRESIDENT
- Principal officer (990 for 2025)
- Kevin R Stone MD, 3727 Buchanan Street 310, San Francisco, CA 94123
- Signed the 990
- Kevin R Stone MD, Chairman
- Phone
- (415) 921-1220
- Website
- www.stoneresearch.org
- Return prepared by
- Fontanello Duffield & Otake LLP
California records
California keeps its own records of charities and corporations. Search them by EIN 94-3228007 or by the name THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
Mission
To advance both scientific and educational enrichment of sports medicine and arthritis and to disseminate the results of analytical and scientific studies.
Program accomplishments
- Successes: For over a decade the Foundation has helped to bring regenerative joint repair solutions directly to patients. Our research focuses on analyzing leading-edge biologic techniques that stimulate the body's ability to heal itself. In the past, artificial joint replacement was the primary option for treating debilitating joint disease. Today, patients have the option of regenerative repair which is less invasive, allows for faster healing and restores biologic joint services. Biologic joint services are superior to metal and plastics because they feel more natural in the body and allow for activity levels not possible with artificial joint replacement. Outcome studies and preclinical research conducted by the Foundation support treatments that return patients to healthier, more active, and more productive lives than was previously possible.Education: Physicians and other medical professionals learn leading-edge treatments emanating from the research performed. Worldwide publications and presentations proliferate those results.Expenses $1,157,397
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 year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 94-3228007
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1997
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Medical research (H51)
- Assets (IRS master file)
- $1,149,057
- Income (IRS master file)
- $1,179,055
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $1,179,055 | $1,582,110 | $1,149,057 | IRS |
| 990 | December 2024 | $1,284,648 | $1,621,543 | $1,471,651 | IRS |
| 990 | December 2023 | $1,532,996 | $1,459,434 | $1,825,083 | XML |
| 990 | December 2022 | $1,834,814 | $913,533 | $1,704,696 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2019 | – | – | – | 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 94-3228007).
Questions about THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS
- What is the EIN of THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS?
- The employer identification number (EIN) of THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS is 94-3228007.
- Is THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1997.
- Are donations to THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS 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 THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS 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 THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS 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 THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS?
- The 990 for the year ended December 31, 2025 names Kevin R Stone MD.
- Who are the officers and directors of THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS?
- The 990 for the year ended December 31, 2025 lists 7 people; 3 received compensation from the organization, the highest $250,000 (Kevin R Stone MD, Chairman).
- How much revenue does THE STONE RESEARCH FOUNDATION FOR SPORTS MEDICINE AND ARTHRITIS have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $1,179,055, expenses of $1,582,110 and total assets of $1,149,057 at year end.
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