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International Society on Thrombosis and Haemostasis Inc

EIN 23-7428305 · Charlotte, NC

Public records show a registered, tax-exempt organization in good standing.

LegitimacyPassesRegistration and standingFinancial healthStrong96 out of 100GovernanceStrong94 out of 100Impact evidenceDescribes programsHow well its results are evidenced

What it says it does

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.

Income
$12.8 million
Spending
$11.9 million
Spent on programs
80%
Reserves
14.8 months of spending
Largest source of income
fees for its services, 71%
Employees
36
Volunteers
175
Highest pay
$440,035, executive di

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Financial health

Strong: 96 out of 100.

  • Reserves

    35 of 35

    Spendable reserves would cover 14.8 months of spending.

  • Debt

    16 of 20

    It owes 19% of what it owns.

  • Living within its means

    15 of 15

    Income exceeded spending by 7% of income.

  • Income trend

    15 of 15

    Income rose 15% on the year before.

  • Spending floor

    15 of 15

    80% of spending went to programs and raising each dollar of donations cost 13 cents.

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Governance

Strong: 94 out of 100.

  • Independent board

    25 of 25

    21 of 21 voting board members are independent.

  • Conflict of interest policy

    15 of 15

    Has a written conflict of interest policy.

  • Whistleblower policy

    8 of 8

    Has a written whistleblower policy.

  • Record keeping policy

    7 of 7

    Has a written policy on keeping and destroying records.

  • Board minutes

    5 of 5

    Keeps minutes of board meetings.

  • Board sees the tax return

    10 of 10

    Gave the board a copy of this return before filing it.

  • Pay set independently

    5 of 5

    Sets its chief executive's pay through independent review and comparison.

  • Independent check of accounts

    9 of 15

    Its accounts were reviewed or compiled by an independent accountant, but not audited.

  • No reported misuse

    10 of 10

    Reports no diversion of assets, excess benefits or loans to insiders.

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Impact evidence

Describes programs. Its tax return describes what it does but we have found no measurable results in it.

Programs described in its return (5)
  1. $5.5 million spent. 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.
  2. $2.0 million spent. 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.
  3. $545,515 spent. 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.
  4. $1.5 million spent. 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.
  5. 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.

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Legitimacy checks

  1. Is it registered with the IRS? Passed.

    Listed in the IRS master file of tax-exempt organizations as a 501(c)(3) charitable organization.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  2. Has the IRS revoked its tax-exempt status? Passed.

    Not on the IRS automatic revocation list.

    Source: Automatic revocation of exemption list, Internal Revenue Service, file dated October 13, 2026.

  3. Are donations tax-deductible? Passed.

    On the IRS list of organizations eligible to receive tax-deductible contributions.

    Source: Publication 78 data: organizations eligible for tax-deductible contributions, Internal Revenue Service, file dated October 13, 2026.

  4. Is it keeping up with its IRS filings? Passed.

    Most recent return on file covers the year ending December 2025.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  5. How long has it been tax-exempt? Passed.

    Recognized by the IRS since January 1975.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  6. Is it in good standing with state regulators? Passed.

    Not on California's list of charities barred from soliciting. Other states are not yet checked.

    Source: May Not Operate or Solicit for Charitable Purposes list, California Attorney General, Registry of Charities and Fundraisers, file dated October 21, 2026.

Ratings and checks are our reading of public records, using the published method. They are not a statement about anyone's honesty. If you work for this organization, you can send corrections or results, confirm you want gifts through Veridonate, or ask to be removed from giving.