Nonprofit · EIN 23-2161580
MATHEMATICAL OPTIMIZATION SOCIETY INC
Tax-exempt · PHILADELPHIA, PA 19104
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $227,966 | $79,435 | $148,531 | $1,249,794 | $93,119 | $1,156,675 |
| December 31, 2024 | 990 | $94,886 | $68,480 | $26,406 | $1,013,484 | $5,335 | $1,008,149 |
| December 31, 2023 | 990 | $116,319 | $104,082 | $12,237 | $989,580 | $7,837 | $981,743 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $0
- Program service revenue
- $192,989
- Investment income
- $34,977
- Other revenue
- $0
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $0
- Salaries, compensation and benefits (total)
- $0
- Professional fundraising fees
- $0
- Accounting fees
- $6,750
- Depreciation
- $250
- Program services (functional)
- $76,003
- Management and general (functional)
- $3,432
Balance sheet and other
- Total assets, start of year
- $1,013,484
- Total assets, end of year
- $1,249,794
- Total liabilities, end of year
- $93,119
- Net assets, end of year
- $1,156,675
- Land, buildings and equipment
- $7,976
- Publicly traded securities
- $22,750
- Net assets without donor restrictions
- $1,082,770
- Net assets with donor restrictions
- $73,905
- Gross receipts
- $227,966
- Employees
- 0
- Year formed
- 1981
- State of legal domicile
- PA
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 |
|---|---|---|---|
| MERVE BODUR | COUNCIL MEMBER Trustee or director | 1 | $0 |
| KATYA SCHEINBERG | CHAIR Trustee or director, Officer | 5 | $0 |
| FABIAN BASTIN | COUNCIL MEMBER Trustee or director | 1 | $0 |
| JORGE VERA | COUNCIL MEMBER Trustee or director | 1 | $0 |
| XIAOJUN CHEN | COUNCIL MEMBER Trustee or director | 1 | $0 |
| MIGUEL ANJOS | Vice Chair Trustee or director, Officer | 3 | $0 |
| SAMUEL BURER | Treas. Outgoing Trustee or director, Officer | 2 | $0 |
| FATMA KILINC-KARZAN | TREASURER Trustee or director, Officer | 3 | $0 |
990 for the year ended December 31, 2024: 13 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| JOHN BIRGE | CHAIR-outgoing Trustee or director, Officer | 1 | $0 |
| MERVE BODUR | COUNCIL MEMBER Trustee or director | 1 | $0 |
| KATYA SCHEINBERG | CHAIR ELECT Trustee or director, Officer | 2 | $0 |
| DAVID MORTON | CHAIR OF EXEC Trustee or director, Officer | 1 | $0 |
| FABIAN BASTIN | COUNCIL MEMBER Trustee or director | 1 | $0 |
| JORGE VERA | COUNCIL MEMBER Trustee or director | 1 | $0 |
| XIAOJUN CHEN | COUNCIL MEMBER Trustee or director | 1 | $0 |
| MIGUEL ANJOS | CHAIR Trustee or director, Officer | 5 | $0 |
| SAMUEL BURER | Treasurer Trustee or director, Officer | 3 | $0 |
| FATMA KILINC-KARZAN | TREASURER ELECT Trustee or director, Officer | 2 | $0 |
| ANDREAS WACHTER | COUNCIL MEMBER Trustee or director | 1 | $0 |
| ANGELIKA WIEGELE | COUNCIL MEMBER Trustee or director | 1 | $0 |
| WOLFRAM WIESEMANN | COUNCIL MEMBER Trustee or director | 1 | $0 |
990 for the year ended December 31, 2023: 9 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| JOHN BIRGE | VICE CHAIR Trustee or director, Officer | 1 | $0 |
| MARINA EPELMAN | Outgoing Treas. Trustee or director, Officer | 1 | $0 |
| DAVID MORTON | CHAIR OF EXEC Trustee or director, Officer | 1 | $0 |
| MIGUEL ANJOS | CHAIR Trustee or director, Officer | 5 | $0 |
| SAMUEL BURER | Treasurer Trustee or director, Officer | 4 | $0 |
| FATMA KILINC-KARZAN | COUNCIL MEMBER Trustee or director | 1 | $0 |
| ANDREAS WACHTER | COUNCIL MEMBER Trustee or director | 1 | $0 |
| ANGELIKA WIEGELE | COUNCIL MEMBER Trustee or director | 1 | $0 |
| WOLFRAM WIESEMANN | COUNCIL MEMBER Trustee or director | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 3600 UNIVERSITY SCIENCE CENTER, PHILADELPHIA, PA 19104-0000
- In care of
- % MARINA A EPELMAN
- Principal officer (990 for 2025)
- KATYA SCHEINBERG, 3600 UNIVERSITY SCIENCE CENTER, PHILADELPHIA, PA 19104
- Signed the 990
- FATMA KILINC-KARZAN, Treasurer
- Phone
- (412) 268-9198
- Website
- WWW.MATHOPT.ORG
- Return prepared by
- Stephen Barry CPA LLC
Mission
THE SOCIETY IS AN INTERNATIONAL ORGANIZATION DEDICATED TO THE PROMOTION AND MAINTENANCE OF HIGH PROFESSIONAL STANDARDS IN THE SUBJECT OF MATHEMATICAL OPTIMIZATION. IT PUBLISHES THE JOURNALS MATHEMATICAL PROGRAMMING A AND B, CONSISTING OF TECHINCAL ARTICLES ON ALL ASPECTS OF THE SUBJECT, THE JOURNAL MATHEMATICAL PROGRAMMING COMPUTATION, FOR ARTICLES WITH A COMPUTATIONAL FOCUS, THE MOS/SIAM SERIES ON OPTIMIZATION, COMPRISING MONOGRAPHS AND TEXTS ON PARTICULAR OPTIMIZATION TOPICS, AND THE NEWSLETTER OPTIMA. EVERY THREE YEARS THE SOCIETY SPONSORS THE INTERNATIONAL SYMPOSIUM ON MATHEMATICAL PROGRAMMING (ISMP). IN OTHER YEARS, IT SUPPORTS THE CONFERENCE ON INTEGER, PROGRAMMING AND COMBINATORIAL OPTIMIZATION (IPCO) AND THE INTERNATIONAL CONFERENCE ON CONTINUOUS OPTIMIZATION (ICCOPT).
Program accomplishments
- PREPARE, PUBLISH AND DISTRIBUTE THE SOCIETY'S TECHNICAL JOURNALS. (1) MATHEMATICAL PROGRAMMING A, 6-9 TIMES A YEAR, (2) MATHEMATICAL PROGRAMMING B INTERMITTENTLY, AND (3) MATHEMATICAL PROGRAMMING COMPUTATION INTERMITTENTLY. PREPARE, PUBLISH AND DISTRIBUTE THE SOCIETY'S GENERAL NEWSLETTER OPTIMA.Expenses $76,003 · revenue $192,989
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
- 23-2161580
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (509(a)(2))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1981
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Assets (IRS master file)
- $1,249,794
- Income (IRS master file)
- $227,966
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $227,966 | $79,435 | $1,249,794 | XML |
| 990 | December 2024 | $94,886 | $68,480 | $1,013,484 | XML |
| 990 | December 2023 | $116,319 | $104,082 | $989,580 | XML |
| 990 | December 2022 | $106,199 | $60,832 | $975,758 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
| 990 | December 2017 | – | – | – | 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 23-2161580).
Questions about MATHEMATICAL OPTIMIZATION SOCIETY INC
- What is the EIN of MATHEMATICAL OPTIMIZATION SOCIETY INC?
- The employer identification number (EIN) of MATHEMATICAL OPTIMIZATION SOCIETY INC is 23-2161580.
- Is MATHEMATICAL OPTIMIZATION SOCIETY INC tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1981.
- Are donations to MATHEMATICAL OPTIMIZATION SOCIETY INC tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does MATHEMATICAL OPTIMIZATION SOCIETY INC 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 MATHEMATICAL OPTIMIZATION SOCIETY INC 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 MATHEMATICAL OPTIMIZATION SOCIETY INC 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 MATHEMATICAL OPTIMIZATION SOCIETY INC?
- The 990 for the year ended December 31, 2025 names KATYA SCHEINBERG.
- Who are the officers and directors of MATHEMATICAL OPTIMIZATION SOCIETY INC?
- The 990 for the year ended December 31, 2025 lists 8 people; 0 received compensation from the organization.
- How much revenue does MATHEMATICAL OPTIMIZATION SOCIETY INC have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $227,966, expenses of $79,435 and total assets of $1,249,794 at year end.
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