Nonprofit · EIN 23-7428305
INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC
Also known as ISTH
Tax-exempt · CHARLOTTE, NC 28204
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $12,803,951 | $11,947,441 | $856,510 | $18,797,413 | $3,528,776 | $15,268,637 |
| December 31, 2024 | 990 | $11,177,139 | $13,221,137 | -$2,043,998 | $17,709,554 | $3,769,527 | $13,940,027 |
| December 31, 2023 | 990 | $12,554,951 | $13,329,163 | -$774,212 | $20,617,721 | $4,508,338 | $16,109,383 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $2,360,597
- Membership dues
- $701,783
- Program service revenue
- $9,084,122
- Investment income
- $1,359,922
- Net gain from sales of assets
- $919,658
- Other revenue
- -$690
Expenses
- Grants and similar amounts paid
- $407,330
- Compensation of officers, directors and key employees
- $385,551
- Other salaries and wages
- $3,025,408
- Salaries, compensation and benefits (total)
- $4,549,055
- Professional fundraising fees
- $0
- Legal fees
- $102,090
- Accounting fees
- $14,000
- Travel
- $199,630
- Depreciation
- $50,877
- Program services (functional)
- $9,558,802
- Management and general (functional)
- $2,074,702
- Fundraising (functional)
- $313,937
Balance sheet and other
- Total assets, start of year
- $17,709,554
- Total assets, end of year
- $18,797,413
- Total liabilities, end of year
- $3,528,776
- Net assets, end of year
- $15,268,637
- Land, buildings and equipment
- $447,857
- Publicly traded securities
- $13,098,428
- Net assets without donor restrictions
- $15,178,637
- Net assets with donor restrictions
- $90,000
- Gross receipts
- $27,294,161
- Employees
- 36
- Volunteers
- 175
- Year formed
- 1974
- State of legal domicile
- NC
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 |
|---|---|---|---|---|
| THOMAS REISER | EXECUTIVE DI Key employee | 40 | $385,551 | $54,484 |
| LOUISE BANNON | DIR MEMBRSHI Highest-paid employee | 40 | $198,498 | $31,220 |
| JEFFREY CAIOLA | DIR FINANCE Highest-paid employee | 40 | $185,289 | $35,678 |
| ROBERT CLARK | DIR PROGRAMS Highest-paid employee | 40 | $171,593 | $42,627 |
| LISA ASTORGA | DIR MEETINGS Highest-paid employee | 40 | $192,528 | $20,849 |
| ERICKA ROBSINSON | DIR PEOPLE C Highest-paid employee | 40 | $165,205 | $33,626 |
| FIONNUALA NI ANILE | DIRECTOR Trustee or director | 1 | $3,000 | $0 |
| PANTEP ANGCHAISUKSIRI | PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| WOLFRAM RUF | PRESIDENT-EL Trustee or director, Officer | 2 | $0 | $0 |
| SAM SCHULMAN | TREASURER Trustee or director, Officer | 2 | $0 | $0 |
| JEFFREY WEITZ | SECRETARY GE Trustee or director, Officer | 2 | $0 | $0 |
| ROBERT ARIENS | DIRECTOR Trustee or director | 1 | $0 | $0 |
| ANA BOBAN | DIRECTOR Trustee or director | 1 | $0 | $0 |
| SABINE EICHINGER | DIRECTOR Trustee or director | 1 | $0 | $0 |
| OMOLADE AWODU | DIRECTOR Trustee or director | 1 | $0 | $0 |
10 more people on this return
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| JEAN CONNORS | DIRECTOR Trustee or director | 1 | $0 |
| SHINYA GOTO | DIRECTOR Trustee or director | 1 | $0 |
| DONNA DIMICHELE | DIRECTOR Trustee or director | 1 | $0 |
| MARY CUSHMAN | DIRECTOR Trustee or director | 1 | $0 |
| WOLFGANG MIESBACH | DIRECTOR Trustee or director | 1 | $0 |
| SASKIA MIDDELDORP | DIRECTOR Trustee or director | 1 | $0 |
| JAMES DOUKETIS | DIRECTOR Trustee or director | 1 | $0 |
| NICOLA MUTCH | DIRECTOR Trustee or director | 1 | $0 |
| CHRISTOPHER WARD | DIRECTOR Trustee or director | 1 | $0 |
| FERNANDA ORSI | DIRECTOR Trustee or director | 1 | $0 |
990 for the year ended December 31, 2024: 25 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| THOMAS REISER | EXECUTIVE DI Key employee | 40 | $371,334 | $49,208 |
| JEFFREY CAIOLA | DIR FINANCE Highest-paid employee | 40 | $186,107 | $31,439 |
| ROBIN BOETTCHER | DIR INDUST R Highest-paid employee | 40 | $187,484 | $29,545 |
| LOUISE BANNON | DIR MEMBRSHI Highest-paid employee | 40 | $186,674 | $29,461 |
| LISA ASTORGA | DIR MEETINGS Highest-paid employee | 40 | $195,195 | $20,919 |
| ROBERT CLARK | DIR PROGRAMS Highest-paid employee | 40 | $175,373 | $33,512 |
| SABINE EICHINGER | DIRECTOR Trustee or director | 1 | $0 | $3,000 |
| JEAN CONNORS | DIRECTOR Trustee or director | 1 | $0 | $3,000 |
| SASKIA MIDDELDORP | DIRECTOR Trustee or director | 1 | $0 | $3,000 |
| FIONNUALA NI ANILE | DIRECTOR Trustee or director | 1 | $0 | $3,000 |
| PANTEP ANGCHAISUKSIRI | PRESIDENT Trustee or director, Officer | 2 | $0 | $0 |
| WOLFRAM RUF | PRESIDENT-EL Trustee or director, Officer | 2 | $0 | $0 |
| SAM SCHULMAN | TREASURER Trustee or director, Officer | 2 | $0 | $0 |
| JEFFREY WEITZ | SECRETARY GE Trustee or director, Officer | 2 | $0 | $0 |
| ROBERT ARIENS | DIRECTOR Trustee or director | 1 | $0 | $0 |
| ANA BOBAN | DIRECTOR Trustee or director | 1 | $0 | $0 |
| OMOLADE AWODU | DIRECTOR Trustee or director | 1 | $0 | $0 |
| SHINYA GOTO | DIRECTOR Trustee or director | 1 | $0 | $0 |
| DONNA DIMICHELE | DIRECTOR Trustee or director | 1 | $0 | $0 |
| MARY CUSHMAN | DIRECTOR Trustee or director | 1 | $0 | $0 |
| WOLFGANG MIESBACH | DIRECTOR Trustee or director | 1 | $0 | $0 |
| JAMES DOUKETIS | DIRECTOR Trustee or director | 1 | $0 | $0 |
| NICOLA MUTCH | DIRECTOR Trustee or director | 1 | $0 | $0 |
| CHRISTOPHER WARD | DIRECTOR Trustee or director | 1 | $0 | $0 |
| FERNANDA ORSI | DIRECTOR Trustee or director | 1 | $0 | $0 |
990 for the year ended December 31, 2023: 27 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| THOMAS REISER | EXECUTIVE DI Key employee | 40 | $355,495 | $47,980 |
| JEFFREY CAIOLA | DIR FINANCE Highest-paid employee | 40 | $180,706 | $32,094 |
| ROBIN BOETCHER | EMPLOYEE Highest-paid employee | 40 | $180,540 | $27,929 |
| LISA ASTORGA | EMPLOYEE Highest-paid employee | 40 | $189,104 | $19,112 |
| LOUISE BANNON | EMPLOYEE Highest-paid employee | 40 | $179,760 | $27,851 |
| ROBERT CLARK | EMPLOYEE Highest-paid employee | 40 | $167,671 | $37,268 |
| M CUSHMAN | DIRECTOR Trustee or director | 1 | $0 | $41,250 |
| P ANGCHAISUKSIRI | PRESIDENT-EL Trustee or director, Officer | 2 | $0 | $3,000 |
| S MIDDELDORP | DIRECTOR Trustee or director | 1 | $0 | $3,000 |
| J CONNORS | DIRECTOR Trustee or director | 1 | $0 | $3,000 |
| F PEYVANDI | PRESIDENT Trustee or director, Officer | 2 | $0 | $1,250 |
| W RUF | DIRECTOR Trustee or director | 1 | $0 | $750 |
| F NI ANIE | DIRECTOR Trustee or director | 1 | $0 | $500 |
| JOOST MEIJERS | EX-OFFICIO D Trustee or director | 1 | $0 | $500 |
| JEFFREY WELTZ | EX-OFFICIO D Trustee or director | 1 | $0 | $500 |
| S SCHULMAN | TREASURER Trustee or director, Officer | 2 | $0 | $0 |
| N KEY | SECRETARY GE Trustee or director, Officer | 2 | $0 | $0 |
| M CARMEN-AMIGO | DIRECTOR Trustee or director | 1 | $0 | $0 |
| C DENIS | DIRECTOR Trustee or director | 1 | $0 | $0 |
| J DI PAOLA | DIRECTOR Trustee or director | 1 | $0 | $0 |
| M SHIMA | DIRECTOR Trustee or director | 1 | $0 | $0 |
| R ARIENS | DIRECTOR Trustee or director | 1 | $0 | $0 |
| O AWODU | DIRECTOR Trustee or director | 1 | $0 | $0 |
| D DIMICHELE | DIRECTOR Trustee or director | 1 | $0 | $0 |
| C WARD | DIRECTOR Trustee or director | 1 | $0 | $0 |
| A BOBAN | DIRECTOR Trustee or director | 1 | $0 | $0 |
| J DOUKETIS | DIRECTOR Trustee or director | 1 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 301 S MCDOWELL ST STE 125 PMB 199, CHARLOTTE, NC 28204-0031
- Principal officer (990 for 2025)
- THOMAS REISER
- Signed the 990
- JEFFREY CAIOLA, DIR FINANCE & OPS
- Phone
- (919) 929-3807
- Website
- WWW.ISTH.ORG
- Return prepared by
- KELLY PARTNERSFRS ACCOUNTANTS
Mission
THE INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS (ISTH) ADVANCES THE UNDERSTANDING, PREVENTION, DIAGNOSIS AND TREATMENT OF CONDITIONS RELATED TO THROMBOSIS AND HEMOSTASIS. THE SOCIETY IS DEDICATED TO TRANSFORMATIVE SCIENTIFIC DISCOVERIES AND CLINICAL PRACTICES, THE DEVELOPMENT OF YOUNG PROFESSIONALS AND THE EDUCATION OF PHYSICIANS, SCIENTISTS AND ALLIED HEALTH PROFESSIONALS WHEREVER THEY MAY LIVE.
Program accomplishments
- THE INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTSIS XXXIII CONGRESS AND 71ST MEETING OF THE SCIENTIFIC AND STANDARDIZATION COMMITTEE TOOK PLACE IN-PERSON (WASHINGTON DC) AND VIRTUALLY JUNE 21-25, 2025. THE SCIENTIFIC PROGRAM INCLUDED EXPERT PRESENTATIONS, EDUCATIONAL, POSTER, TECHNICAL, AND SSC SUBCOMMITTEE SESSIONS AS WELL AS SUBMISSION AND PRESENTATION OF ABSTRACTS. ISTH CONGRESSES ARE OPEN TO THE GLOBAL SCIENTIFIC COMMUNITY IN THE FIELD OF THROMBOSIS AND HAEMOSTASIS. MANY OF THE PROCEEDINGS OF THE CONGRESS ARE AVAILABLE VIA OPEN ACCESS THROUGH THE SOCIETY'S JOURNAL AND WEBSITE.Expenses $5,487,426 · revenue $6,170,445
- EDUCATION SYMPOSIA LED BY EXPERT MEMBERS IN INDUSTRIALIZED AND DEVELOPING COUNTRIES, FELLOWSHIPS AND TRAINING COURSES FOR EARLY CAREER PROFESSIONALS FROM BOTH INDUSTRIALIZED AND DEVELOPING COUNTRIES, WEBINARS, WEBCASTS AND ON-LINE COURSES DEVELOPED BY INTERNATIONALLY RECOGNIZED EXPERTS, SUPPORT FOR ABSTRACT PRESENTERS FROM DEVELOPING COUNTRIES TO ATTEND ANNUAL MEETINGS.Expenses $1,976,294 · grants $285,658
- ADVOCACY: WORLD THROMBOSIS DAY (WTD) IS A GLOBAL INITIATIVE INCREASING AWARENESS OF BLOOD CLOTS-THEIR CAUSES, RISK FACTORS, SYMPTOMS, PREVENTION, AND TREATMENT-TO REDUCE THROMBOSIS-RELATED DEATH AND DISABILITY. AS A WHO NON-STATE ACTOR, ISTH INTEGRATES THE LATEST COAGULATION RESEARCH INTO PUBLIC HEALTH DECISION-MAKING TO IMPROVE PATIENT OUTCOMES. AS A FOUNDING MEMBER OF ETHA, WE UNITE LEADING ORGANIZATIONS TO ADVANCE THROMBOSIS AND HEMOSTASIS POLICY, EDUCATION, AND RESEARCH ACROSS EUROPE.Expenses $545,515 · grants $3,000
- PUBLICATION (HARDCOPY AND ONLINE) OF THE JOURNAL OF THROMBOSIS AND HAEMOSTASIS(JTH), WHICH SERVES AS AN INTERNATIONAL FORUM FOR ORIGINAL RESEARCH ARTICLES, REPORTS AND RECOMMENDATIONS AND REVIEWS RELATED TO THE IMPORTANT MEDICAL PROBLEMS OF THROMBOSIS, BLEEDING DISORDERS, AND VASCULAR BIOLOGY. TWELVE ISSUES ARE PUBLISHED ANNUALLY. PUBLICATION OF A MONTHLY E- NEWSLETTER PROVIDING INFORMATION ON ISTH EVENTS, EDUCATIONAL ACTIVITIES AND PROGRAMS, NEWS AND INTERVIEWS. COMPLEMENTING THE SOCIETY'S FLAGSHIP JOURNAL, JOURNAL OF THROMBOSIS AND HAEMOSTASIS (JTH), IS THE OPEN ACCESS ONLINE JOURNAL, RESEARCH AND PRACTICE IN THROMBOSIS AND HAEMOSTASIS (RPTH). RPTH IS A PLATFORM FOR SCIENCE AND DISCOURSE AMONG RESEARCHERS, CLINICIANS, NURSES, ALLIED HEALTH PROFESSIONALS, AND PATIENTS. PUBLISHED IN PARTNERSHIP WITH ELSEVIER, RPTH IS INTERESTED IN BASIC, CLINICAL, TRANSLATIONAL AND POPULATION OR PUBLIC HEALTH RESEARCH. MEMBER SERVICES PROVIDES BENEFITS TAILORED TO CLINICIANS, RESEARCHERS, NURSES, AND ALLIED HEALTH PROFESSIONALS AT ALL STAGES OF THEIR CAREERS IN BLEEDING AND CLOTTING DISORDERS THROUGH EDUCATION, PROGRAMS AND ACTIVITIES, AND PROFESSIONAL NETWORKING. THE SCIENTIFIC AND STANDARDIZATION COMMITTEE (SSC) IS A PERMANENT COMMITTEE OF THE ISTH AND IS ITS SCIENTIFIC WORKING ARM. CONDUCTED THROUGH SUBCOMMITTEES AND WORKING GROUPS, ITS ACTIVITIES PROMOTE COOPERATION AMONG LEADING INTERNATIONAL SCIENTISTS AND DIRECT THEIR ENERGIES TO PROJECTS THAT GENERATE RELIABLE AND STANDARDIZED CLINICAL AND BASIC SCIENCE TOOLS.Expenses $1,549,567 · grants $118,672 · revenue $2,913,677
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
- 23-7428305
- 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
- 1975
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Assets (IRS master file)
- $18,797,413
- Income (IRS master file)
- $27,294,161
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $12,803,951 | $11,947,441 | $18,797,413 | XML |
| 990 | December 2024 | $11,177,139 | $13,221,137 | $17,709,554 | XML |
| 990 | December 2023 | $12,554,951 | $13,329,163 | $20,617,721 | XML |
| 990 | December 2022 | $12,323,141 | $13,841,123 | $21,195,374 | 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 23-7428305).
Questions about INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC
- What is the EIN of INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC?
- The employer identification number (EIN) of INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC is 23-7428305.
- Is INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1975.
- Are donations to INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS 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 INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS 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 INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS 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 INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC?
- The 990 for the year ended December 31, 2025 names THOMAS REISER.
- Who are the officers and directors of INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC?
- The 990 for the year ended December 31, 2025 lists 25 people; 7 received compensation from the organization, the highest $385,551 (THOMAS REISER, EXECUTIVE DI).
- How much revenue does INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $12,803,951, expenses of $11,947,441 and total assets of $18,797,413 at year end.
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