International Society on Thrombosis
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.
Key facts about International Society on Thrombosis
- EIN
- 23-7428305
- Latest 990 filing
- Form 990-PF, 2025
- Annual giving (2025)
- $130,119
- Grants made (2025)
- 4
- Average grant
- $32,530
- Median grant
- $33,850
- Total assets
- $18,797,413
- Primary geography
- North Carolina (38% of itemized 2025 grant dollars)
Data from IRS Form 990-PF, 2025; updated September 2026.
Who International Society on Thrombosis funds
By grant dollars, the top recipient states for International Society on Thrombosis's 4 itemized 2025 grants were North Carolina (38%), Massachusetts (38%) and Michigan (14%). None of its 4 grants with a stated purpose were described as general or operating support. Recurring purposes include "Fundamental Research" (3 grants).
Next steps with International Society on Thrombosis
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Financial Overview
From 2025 IRS Form 990-PF · View filing
Total Assets
$18.8M
+6.1% YoY
Annual Giving
$130K
Grant Count
4
Avg Grant Size
$33K
About International Society on Thrombosis
Based on IRS filings
International Society on Thrombosis is a nonprofit organization, based in Charlotte, NC. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $18.8M in total assets. In 2025, it awarded 4 grants totaling $130K. Net investment income was $1.4M.
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Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of all 4 itemized 2025 grant dollars.
Cities
Financial History
Multi-year comparison from IRS filings
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $18,797,413 | $17,709,554 | $20,617,721 |
| Revenue | $12,803,951 | $11,177,139 | $12,554,951 |
| Expenses | $11,947,441 | $13,221,137 | $13,329,163 |
| Qualifying Distributions | — | — | — |
| Net Investment Income | $1,359,922 | $1,438,508 | $610,614 |
| Distributable Amount | — | — | — |
Data update history
When this profile's IRS filing data changed on Grantable
- Updated Form 990 for fiscal year 2025 (received by the IRS April 22, 2026)
Giving Over Time
Total grant dollars and number of grants per year
Grant Insights
How this funder distributes its grants
Top Recipients
Top 4 recipients in 2025
Grant Size Distribution
4 grants across all recorded years
Giving History
Grant recipients and amounts by year
Among its reported 2025 grants, the largest recipients include University of North Carolina ($50,000), Brigham and Women's Hospital ($50,000), The Regents of the Univ of Michigan ($17,700).
| Recipient | Purpose | Amount |
|---|---|---|
| UNIVERSITY OF NORTH CAROLINA Chapel Hill, NC | FUNDAMENTAL RESEARCH | $50,000 |
| BRIGHAM AND WOMEN'S HOSPITAL Boston, MA | FUNDAMENTAL RESEARCH | $50,000 |
| THE REGENTS OF THE UNIV OF MICHIGAN Ann Arbor, MI | FUNDAMENTAL RESEARCH | $17,700 |
| ENDEAVOR HEALTH Evanston, IL | PERIPOERATIVE CARE | $12,419 |
Leadership & Key People
Officers and directors from IRS filings
Compensation Overview
From 2025 IRS filing
From 2025 IRS filing
| Name | Title | Hours | Compensation |
|---|---|---|---|
| Pantep Angchaisuksiri | President | 2 | — |
| Wolfram Ruf | President-El | 2 | — |
| Sam Schulman | Treasurer | 2 | — |
| Jeffrey Weitz | Secretary Ge | 2 | — |
| Robert Ariens | Director | 1 | — |
| Ana Boban | Director | 1 | — |
| Sabine Eichinger | Director | 1 | — |
| Omolade Awodu | Director | 1 | — |
| Jean Connors | Director | 1 | — |
| Shinya Goto | Director | 1 | — |
| Donna Dimichele | Director | 1 | — |
| Mary Cushman | Director | 1 | — |
| Wolfgang Miesbach | Director | 1 | — |
| Saskia Middeldorp | Director | 1 | — |
| James Douketis | Director | 1 | — |
| Nicola Mutch | Director | 1 | — |
| Christopher Ward | Director | 1 | — |
| Fionnuala Ni Anile | Director | 1 | $3,000 |
| Fernanda Orsi | Director | 1 | — |
| Thomas Reiser | Executive Di | 40 | $385,551 |
| Lisa Astorga | Dir Meetings | 40 | $192,528 |
| Louise Bannon | Dir Membrshi | 40 | $198,498 |
| Jeffrey Caiola | Dir Finance | 40 | $185,289 |
| Robert Clark | Dir Programs | 40 | $171,593 |
| Ericka Robsinson | Dir People C | 40 | $165,205 |
Frequently Asked Questions
How large is International Society on Thrombosis?
As of 2025, International Society on Thrombosis holds $18.8M in total assets with $12.8M in annual revenue. It awarded 4 grants totaling $130K in 2025.
Where does International Society on Thrombosis operate?
International Society on Thrombosis has awarded grants in Illinois, Massachusetts, Michigan, North Carolina.
What size grants does International Society on Thrombosis award?
In 2025, International Society on Thrombosis awarded 4 grants totaling $130K — an average of about $33K per grant, based on its IRS Form 990 filings.
What is International Society on Thrombosis's EIN?
International Society on Thrombosis's EIN (Employer Identification Number) is 23-7428305. IRS Form 990 filing data is available on this page for 2020–2025.
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Data last updated September 2026. Sourced from IRS Form 990-PF filings.