TY 2025 Form 990

(A) Name and title	(B) Average hours per week (list any hours for related organizations below dotted line)	(C) Position (do not check more than one box, unless person is both an officer and a director/trustee)	(E) Reportable compensation from related organizations (W-2/1099-MISC/1099-NEC)
(1) PANTEP ANGCHAISUKSIRI...................................................................... PRESIDENT	2.00 .................	X	X
(2) WOLFRAM RUF...................................................................... PRESIDENT-EL	2.00 .................	X	X
(3) SAM SCHULMAN...................................................................... TREASURER	2.00 .................	X	X
(4) JEFFREY WEITZ...................................................................... SECRETARY GE	2.00 .................	X	X
(5) ROBERT ARIENS...................................................................... DIRECTOR	1.00 .................	X
(6) ANA BOBAN...................................................................... DIRECTOR	1.00 .................	X
(7) SABINE EICHINGER...................................................................... DIRECTOR	1.00 .................	X
(8) OMOLADE AWODU...................................................................... DIRECTOR	1.00 .................	X
(9) JEAN CONNORS...................................................................... DIRECTOR	1.00 .................	X
(10) SHINYA GOTO...................................................................... DIRECTOR	1.00 .................	X
(11) DONNA DIMICHELE...................................................................... DIRECTOR	1.00 .................	X
(12) MARY CUSHMAN...................................................................... DIRECTOR	1.00 .................	X
(13) WOLFGANG MIESBACH...................................................................... DIRECTOR	1.00 .................	X
(14) SASKIA MIDDELDORP...................................................................... DIRECTOR	1.00 .................	X
(15) JAMES DOUKETIS...................................................................... DIRECTOR	1.00 .................	X
(16) NICOLA MUTCH...................................................................... DIRECTOR	1.00 .................	X
(17) CHRISTOPHER WARD...................................................................... DIRECTOR	1.00 .................	X

- TIN:

SCHEDULE A
(Form 990)

Department of the Treasury
Internal Revenue Service

Public Charity Status and Public Support

Complete if the organization is a section 501(c)(3) organization or a section 4947(a)(1) nonexempt charitable trust.
Attach to Form 990 or Form 990-EZ.
Go to www.irs.gov/Form990 for instructions and the latest information.

OMB No. 1545-0047

2025

Open to Public
Inspection

Name of the organization

INTERNATIONAL SOCIETY ON THROMBOSIS
AND HAEMOSTASIS INC

Employer identification number

23-7428305

Part I

Reason for Public Charity Status (All organizations must complete this part.) See instructions.

The organization is not a private foundation because it is: (For lines 1 through 12, check only one box.)

A church, convention of churches, or association of churches described in section 170(b)(1)(A)(i).

A school described in section 170(b)(1)(A)(ii). (Attach Schedule E (Form 990).)

A hospital or a cooperative hospital service organization described in section 170(b)(1)(A)(iii).

A medical research organization operated in conjunction with a hospital described in section 170(b)(1)(A)(iii). Enter the hospital's name, city, and state:

An organization operated for the benefit of a college or university owned or operated by a governmental unit described in section 170(b)(1)(A)(iv). (Complete Part II.)

A federal, state, or local government or governmental unit described in section 170(b)(1)(A)(v).

An organization that normally receives a substantial part of its support from a governmental unit or from the general public described in section 170(b)(1)(A)(vi). (Complete Part II.)

A community trust described in section 170(b)(1)(A)(vi). (Complete Part II.)

An agricultural research organization described in 170(b)(1)(A)(ix) operated in conjunction with a land-grant college or university or a non-land grant college of agriculture. See instructions. Enter the name, city, and state of the college or university:

An organization that normally receives: (1) more than 33 1/3% of its support from contributions, membership fees, and gross receipts from activities related to its exempt functions—subject to certain exceptions, and (2) no more than 33 1/3% of its support from gross investment income and unrelated business taxable income (less section 511 tax) from businesses acquired by the organization after June 30, 1975. See section 509(a)(2). (Complete Part III.)

An organization organized and operated exclusively to test for public safety. See section 509(a)(4).

An organization organized and operated exclusively for the benefit of, to perform the functions of, or to carry out the purposes of one or more publicly supported organizations described in section 509(a)(1) or section 509(a)(2). See section 509(a)(3). Check the box on lines 12a through 12d that describes the type of supporting organization and complete lines 12e, 12f, and 12g.

Type I. A supporting organization operated, supervised, or controlled by its supported organization(s), typically by giving the supported organization(s) the power to regularly appoint or elect a majority of the directors or trustees of the supporting organization. You must complete Part IV, Sections A and B.

Type II. A supporting organization supervised or controlled in connection with its supported organization(s), by having control or management of the supporting organization vested in the same persons that control or manage the supported organization(s). You must complete Part IV, Sections A and C.

Type III functionally integrated. A supporting organization operated in connection with, and functionally integrated with, its supported organization(s) (see instructions). You must complete Part IV, Sections A, D, and E.

Type III non-functionally integrated. A supporting organization operated in connection with its supported organization(s) that is not functionally integrated. The organization must generally satisfy a distribution requirement and an attentiveness requirement (see instructions). You must complete Part IV, Sections A and D, and Part V.

Check this box if the organization received a written determination from the IRS that it is a Type I, Type II, Type III functionally integrated, or Type III non-functionally integrated supporting organization.

Enter the number of supported organizations ...........................

Provide the following information about the supported organization(s).

(i) Name of supported organization	(ii) EIN	(iv) Is the organization listed in your governing document?		(v) Amount of monetary support (see instructions)	(vi) Amount of other support (see instructions)
(i) Name of supported organization	(ii) EIN	Yes	No	(v) Amount of monetary support (see instructions)	(vi) Amount of other support (see instructions)


Total

For Paperwork Reduction Act Notice, see the Instructions for
Form 990 or 990-EZ.

Cat. No. 11285F

Schedule A (Form 990) 2025

Page 2

Part II

Support Schedule for Organizations Described in Sections 170(b)(1)(A)(iv) and 170(b)(1)(A)(vi)
(Complete only if you checked the box on line 5, 7, or 8 of Part I or if the organization failed to qualify under Part III. If the organization failed to qualify under the tests listed below, please complete Part III.)

Section A. Public Support

Calendar year (or fiscal year beginning in)		(a) 2021	(b) 2022	(c) 2023	(d) 2024	(e) 2025	(f) Total
1	Gifts, grants, contributions, and membership fees received. (Do not include any "unusual grant.") ..
2	Tax revenues levied for the organization's benefit and either paid to or expended on its behalf ....
3	The value of services or facilities furnished by a governmental unit to the organization without charge..
4	Total. Add lines 1 through 3
5	The portion of total contributions by each person (other than a governmental unit or publicly supported organization) included on line 1 that exceeds 2% of the amount shown on line 11, column (f) ..
6	Public support. Subtract line 5 from line 4.

Section B. Total Support

Calendar year (or fiscal year beginning in)		(a) 2021	(b) 2022	(c) 2023	(d) 2024	(e) 2025	(f) Total
7	Amounts from line 4..
8	Gross income from interest, dividends, payments received on securities loans, rents, royalties and income from similar sources...
9	Net income from unrelated business activities, whether or not the business is regularly carried on..
10	Other income. Do not include gain or loss from the sale of capital assets (Explain in Part VI.)..
11	Total support. Add lines 7 through 10

Gross receipts from related activities, etc. (see instructions) ..................

First 5 years. If the Form 990 is for the organization's first, second, third, fourth, or fifth tax year as a section 501(c)(3) organization, check this box and stop here ........................................

Section C. Computation of Public Support Percentage

Public support percentage for 2025 (line 6, column (f) divided by line 11, column (f)) .........

Public support percentage for 2024 Schedule A, Part II, line 14 ...............

16a

33 1/3% support test—2025. If the organization did not check the box on line 13, and line 14 is 33 1/3% or more, check this box
and stop here. The organization qualifies as a publicly supported organization .......................

33 1/3% support test—2024. If the organization did not check a box on line 13 or 16a, and line 15 is 33 1/3% or more, check this
box and stop here. The organization qualifies as a publicly supported organization .....................

17a

10%-facts-and-circumstances test—2025. If the organization did not check a box on line 13, 16a, or 16b, and line 14 is 10% or more, and if the organization meets the "facts-and-circumstances" test, check this box and stop here. Explain in Part VI how the organization meets the "facts-and-circumstances" test. The organization qualifies as a publicly supported organization ............

10%-facts-and-circumstances test—2024. If the organization did not check a box on line 13, 16a, 16b, or 17a, and line 15 is 10% or more, and if the organization meets the "facts-and-circumstances" test, check this box and stop here. Explain in Part VI how the organization meets the "facts-and-circumstances" test. The organization qualifies as a publicly supported organization ............

Private foundation. If the organization did not check a box on line 13, 16a, 16b, 17a, or 17b, check this box and see
instructions .....................................................

Schedule A (Form 990) 2025

Page 3

Part III

Support Schedule for Organizations Described in Section 509(a)(2)
(Complete only if you checked the box on line 10 of Part I or if the organization failed to qualify under Part II. If the organization fails to qualify under the tests listed below, please complete Part II.)

Section A. Public Support

Calendar year (or fiscal year beginning in)		(a) 2021	(b) 2022	(c) 2023	(d) 2024	(e) 2025	(f) Total
1	Gifts, grants, contributions, and membership fees received. (Do not include any "unusual grants.")	2,773,748	2,617,283	2,410,644	2,298,293	2,360,597	12,460,565
2	Gross receipts from admissions, merchandise sold or services performed, or facilities furnished in any activity that is related to the organization's tax-exempt purpose	5,903,922	9,217,927	9,533,693	7,440,338	9,083,432	41,179,312
3	Gross receipts from activities that are not an unrelated trade or business under section 513 .....
4	Tax revenues levied for the organization's benefit and either paid to or expended on its behalf...
5	The value of services or facilities furnished by a governmental unit to the organization without charge
6	Total. Add lines 1 through 5	8,677,670	11,835,210	11,944,337	9,738,631	11,444,029	53,639,877
7a	Amounts included on lines 1, 2, and 3 received from disqualified persons
b	Amounts included on lines 2 and 3 received from other than disqualified persons that exceed the greater of $5,000 or 1% of the amount on line 13 for the year.	1,747,487	1,432,380	1,659,073	464,791	1,023,442	6,327,173
c	Add lines 7a and 7b..	1,747,487	1,432,380	1,659,073	464,791	1,023,442	6,327,173
8	Public support. (Subtract line 7c from line 6.)						47,312,704

Section B. Total Support

Calendar year (or fiscal year beginning in)		(a) 2021	(b) 2022	(c) 2023	(d) 2024	(e) 2025	(f) Total
9	Amounts from line 6	8,677,670	11,835,210	11,944,337	9,738,631	11,444,029	53,639,877
10a	Gross income from interest, dividends, payments received on securities loans, rents, royalties and income from similar sources	335,927	343,952	435,155	450,030	440,264	2,005,328
b	Unrelated business taxable income (less section 511 taxes) from businesses acquired after June 30, 1975
c	Add lines 10a and 10b	335,927	343,952	435,155	450,030	440,264	2,005,328
11	Net income from unrelated business activities not included on line 10b, whether or not the business is regularly carried on.
12	Other income. Do not include gain or loss from the sale of capital assets (Explain in Part VI.) ..
13	Total support. (Add lines 9, 10c, 11, and 12.)..	9,013,597	12,179,162	12,379,492	10,188,661	11,884,293	55,645,205

Section C. Computation of Public Support Percentage

Public support percentage for 2025 (line 8, column (f) divided by line 13, column (f)) .........

85.030 %

Public support percentage from 2024 Schedule A, Part III, line 15 ...............

82.570 %

Section D. Computation of Investment Income Percentage

Investment income percentage for 2025 (line 10c, column (f) divided by line 13, column (f)) ......

4.000 %

Investment income percentage from 2024 Schedule A, Part III, line 17 .............

4.000 %

19a

33 1/3% support tests-2025. If the organization did not check the box on line 14, and line 15 is more than 33 1/3%, and line 17 is not more than 33 1/3%, check this box and stop here. The organization qualifies as a publicly supported organization .......

33 1/3 % support tests—2024. If the organization did not check a box on line 14 or line 19a, and line 16 is more than 33 1/3% and line 18 is not more than 33 1/3%, check this box and stop here. The organization qualifies as a publicly supported organization .....

Private foundation. If the organization did not check a box on line 14, 19a, or 19b, check this box and see instructions ....

Schedule A (Form 990) 2025

Page 4

Part IV

Supporting Organizations

(Complete only if you checked a box on line 12 of Part I. If you checked box 12a, of Part I, complete Sections A and B. If you checked box 12b, of Part I, complete Sections A and C. If you checked box 12c, of Part I, complete Sections A, D, and E. If you checked box12d, of Part I, complete Sections A and D, and complete Part V.)

Section A. All Supporting Organizations

Yes

Are all of the organization’s supported organizations listed by name in the organization’s governing documents?
If "No," describe in Part VI how the supported organizations are designated. If designated by class or purpose,
describe the designation. If historic and continuing relationship, explain.

Did the organization have any supported organization that does not have an IRS determination of status under section 509(a)(1) or (2)? If "Yes," explain in Part VI how the organization determined that the supported organization was described in section 509(a)(1) or (2).

Did the organization have a supported organization described in section 501(c)(4), (5), or (6)? If "Yes," answer lines 3b and 3c below.

Did the organization confirm that each supported organization qualified under section 501(c)(4), (5), or (6) and satisfied the public support tests under section 509(a)(2)? If "Yes," describe in Part VI when and how the organization made the determination.

Did the organization ensure that all support to such organizations was used exclusively for section 170(c)(2)(B) purposes? If "Yes," explain in Part VI what controls the organization put in place to ensure such use.

Was any supported organization not organized in the United States ("foreign supported organization")? If “Yes” and if you checked box 12a or 12b in Part I, answer lines 4b and 4c below.

Did the organization have ultimate control and discretion in deciding whether to make grants to the foreign supported organization? If “Yes,” describe in Part VI how the organization had such control and discretion despite being controlled or supervised by or in connection with its supported organizations.

Did the organization support any foreign supported organization that does not have an IRS determination under sections 501(c)(3) and 509(a)(1) or (2)? If “Yes,” explain in Part VI what controls the organization used to ensure that all support to the foreign supported organization was used exclusively for section 170(c)(2)(B) purposes.

Did the organization add, substitute, or remove any supported organizations during the tax year? If “Yes,” answer lines 5b and 5c below (if applicable). Also, provide detail in Part VI, including (i) the names and EIN numbers of the supported organizations added, substituted, or removed; (ii) the reasons for each such action; (iii) the authority under the organization's organizing document authorizing such action; and (iv) how the action was accomplished (such as by amendment to the organizing document).

Type I or Type II only. Was any added or substituted supported organization part of a class already designated in the organization's organizing document?

Substitutions only. Was the substitution the result of an event beyond the organization's control?

Did the organization provide support (whether in the form of grants or the provision of services or facilities) to anyone other than (i) its supported organizations, (ii) individuals that are part of the charitable class benefited by one or more of its supported organizations, or (iii) other supporting organizations that also support or benefit one or more of the filing organization’s supported organizations? If “Yes,” provide detail in Part VI.

Did the organization provide a grant, loan, compensation, or other similar payment to a substantial contributor (defined in section 4958(c)(3)(C)), a family member of a substantial contributor, or a 35% controlled entity with regard to a substantial contributor? If “Yes,” complete Part I of Schedule L (Form 990) .

Did the organization make a loan to a disqualified person (as defined in section 4958) not described on line 7? If “Yes,” complete Part I of Schedule L (Form 990).

Was the organization controlled directly or indirectly at any time during the tax year by one or more disqualified persons, as defined in section 4946 (other than foundation managers and organizations described in section 509(a)(1) or (2))? If “Yes,” provide detail in Part VI.

Did one or more disqualified persons (as defined on line 9a) hold a controlling interest in any entity in which the supporting organization had an interest? If “Yes,” provide detail in Part VI.

Did a disqualified person (as defined on line 9a) have an ownership interest in, or derive any personal benefit from, assets in which the supporting organization also had an interest? If “Yes,” provide detail in Part VI.

10a

Was the organization subject to the excess business holdings rules of section 4943 because of section 4943(f) (regarding certain Type II supporting organizations, and all Type III non-functionally integrated supporting organizations)? If “Yes,” answer line 10b below.

10a

Did the organization have any excess business holdings in the tax year? (Use Schedule C, Form 4720, to determine whether the organization had excess business holdings).

10b

Schedule A (Form 990) 2025

Page 5

Part IV

Supporting Organizations (continued)

Yes

Has the organization accepted a gift or contribution from any of the following persons?

A person who directly or indirectly controls, either alone or together with persons described on lines 11b and 11c below, the governing body of a supported organization?

11a

A family member of a person described on 11a above?

11b

A 35% controlled entity of a person described on line 11a or 11b above? If “Yes” to 11a, 11b, or 11c, provide detail in Part VI.

11c

Section B. Type I Supporting Organizations

Yes

Did the officers, directors, trustees, or membership of one or more supported organizations have the power to regularly appoint or elect at least a majority of the organization’s directors or trustees at all times during the tax year? If “No,” describe in Part VI how the supported organization(s) effectively operated, supervised, or controlled the organization’s activities. If the organization had more than one supported organization, describe how the powers to appoint and/or remove directors or trustees were allocated among the supported organizations and what conditions or restrictions, if any, applied to such powers during the tax year.

Did the organization operate for the benefit of any supported organization other than the supported organization(s) that operated, supervised, or controlled the supporting organization? If “Yes,” explain in Part VI how providing such benefit carried out the purposes of the supported organization(s) that operated, supervised or controlled the supporting organization.

Section C. Type II Supporting Organizations

Yes

Were a majority of the organization’s directors or trustees during the tax year also a majority of the directors or trustees of each of the organization’s supported organization(s)? If “No,” describe in Part VI how control or management of the supporting organization was vested in the same persons that controlled or managed the supported organization(s).

Section D. All Type III Supporting Organizations

Yes

Did the organization provide to each of its supported organizations, by the last day of the fifth month of the organization’s tax year, (i) a written notice describing the type and amount of support provided during the prior tax year, (ii) a copy of the Form 990 that was most recently filed as of the date of notification, and (iii) copies of the organization’s governing documents in effect on the date of notification, to the extent not previously provided?

Were any of the organization’s officers, directors, or trustees either (i) appointed or elected by the supported organization(s) or (ii) serving on the governing body of a supported organization? If "No," explain in Part VI how the organization maintained a close and continuous working relationship with the supported organization(s).

By reason of the relationship described in line 2 above, did the organization’s supported organizations have a significant voice in the organization’s investment policies and in directing the use of the organization’s income or assets at all times during the tax year? If "Yes," describe in Part VI the role the organization’s supported organizations played in this regard.

Section E. Type III Functionally-Integrated Supporting Organizations

Check the box next to the method that the organization used to satisfy the Integral Part Test during the year (see instructions):

The organization satisfied the Activities Test. Complete line 2 below.

The organization is the parent of each of its supported organizations. Complete line 3 below.

The organization supported a governmental supported organization. Describe in Part VI how you supported a governmental supported organization (see instructions).

Activities Test. Answer lines 2a and 2b below.

Yes

Did substantially all of the organization’s activities during the tax year directly further the exempt purposes of its supported organization(s)? If "Yes," then in Part VI identify those supported organizations and explain how these activities directly furthered their exempt purposes, how the organization was responsive to each of its supported organizations, and how the organization determined that these activities constituted substantially all of its activities.

Did the activities described on line 2a, above, constitute activities that, but for the organization’s involvement, one or more of the organization’s supported organization(s) would have been engaged in? If “Yes,” explain in Part VI the reasons for the organization’s position that its supported organization(s) would have engaged in these activities but for the organization’s involvement.

Parent of Supported Organizations. Answer lines 3a, 3b, and 3c below.

Are the organization and its supported organization(s) part of an integrated system (for example, a hospital system)? If “Yes,” provide details in Part VI.

Did the organization direct the policies, programs, and activities of each of its supported organizations? If "Yes," describe in Part VI the role played by the organization in this regard.

Did the organization have the power to regularly appoint or elect (and remove) a majority of the officers, directors, or trustees of each of the supported organizations?If "Yes" or "No", provide details in Part VI.

Schedule A (Form 990) 2025

Page 6

Part V

Type III Non-Functionally Integrated 509(a)(3) Supporting Organizations

Check here if the organization satisfied the Integral Part Test as a qualifying trust on Nov. 20, 1970 (explain in Part VI). See instructions. All other Type III non-functionally integrated supporting organizations must complete Sections A through E.

	Section A - Adjusted Net Income		(A) Prior Year	(B) Current Year (optional)
1	Net short-term capital gain	1
2	Recoveries of prior-year distributions	2
3	Other gross income (see instructions)	3
4	Add lines 1 through 3	4
5	Depreciation and depletion	5
6	Portion of operating expenses paid or incurred for production or collection of gross income or for management, conservation, or maintenance of property held for production of income (see instructions)	6
7	Other expenses (see instructions)	7
8	Adjusted Net Income (subtract lines 5, 6 and 7 from line 4)	8

	Section B - Minimum Asset Amount		(A) Prior Year	(B) Current Year (optional)
1	Aggregate fair market value of all non-exempt-use assets (see instructions for short tax year or assets held for part of year):	1
a	Average monthly value of securities	1a
b	Average monthly cash balances	1b
c	Fair market value of other non-exempt-use assets	1c
d	Total (add lines 1a, 1b, and 1c)	1d
e	Discount claimed for blockage or other factors (explain in detail in Part VI):
2	Acquisition indebtedness applicable to non-exempt use assets	2
3	Subtract line 2 from line 1d	3
4	Cash deemed held for exempt use. Enter 0.015 of line 3 (for greater amount, see instructions).	4
5	Net value of non-exempt-use assets (subtract line 4 from line 3)	5
6	Multiply line 5 by 0.035	6
7	Recoveries of prior-year distributions	7
8	Minimum Asset Amount (add line 7 to line 6)	8

	Section C - Distributable Amount		Current Year
1	Adjusted net income for prior year (from Section A, line 8, Column A)	1
2	Enter 85% of line 1	2
3	Minimum asset amount for prior year (from Section B, line 8, Column A)	3
4	Enter greater of line 2 or line 3	4
5	Income tax imposed in prior year	5
6	Distributable Amount. Subtract line 5 from line 4, unless subject to emergency temporary reduction (see instructions)	6

Check here if the current year is the organization's first as a non-functionally- integrated Type III supporting organization (see instructions)

Schedule A (Form 990) 2025

Page 7

Part V

Type III Non-Functionally Integrated 509(a)(3) Supporting Organizations(continued)

Section D - Distributions		Current Year
1 Amounts paid to supported organizations to accomplish exempt purposes	1
2 Amounts paid to perform activity that directly furthers exempt purposes of supported organizations, in excess of income from activity	2
3 Administrative expenses paid to accomplish exempt purposes of supported organizations	3
4 Amounts paid to acquire exempt-use assets	4
5 Qualified set-aside amounts (prior IRS approval required - provide details in Part VI)	5
6Total annual distributions. Add lines 1 through 5.	6
7 Distributions to attentive supported organizations to which the organization is responsive (provide details in Part VI). See instructions	7
8 Distributable amount for 2025 from Section C, line 6	8
9 Line 7 amount divided by Line 8 amount	9

Section E - Distribution Allocations (see instructions)		(i) Excess Distributions	(ii) Underdistributions Pre-2025	(iii) Distributable Amount for 2025
1 Distributable amount for 2025 from Section C, line 6
2 Underdistributions, if any, for years prior to 2025 (reasonable cause required-- explain in Part VI). See instructions.
3 Excess distributions carryover, if any, to 2025:
a From 2020.......
b From 2021.......
c From 2022.......
d From 2023.......
e From 2024.......
fTotal of lines 3a through e
g Applied to underdistributions of prior years
h Applied to 2025 distributable amount
i Carryover from 2020 not applied (see instructions)
j Remainder. Subtract lines 3g, 3h, and 3i from line 3f.
4Distributions for 2025 from Section D, line 6:
$
a Applied to underdistributions of prior years
b Applied to 2025 distributable amount
c Remainder. Subtract lines 4a and 4b from line 4.
5 Remaining underdistributions for years prior to 2025, if any. Subtract lines 3g and 4a from line 2. If the amount is greater than zero, explain in Part VI. See instructions.
6 Remaining underdistributions for 2025. Subtract lines 3h and 4b from line 1. If the amount is greater than zero, explain in Part VI. See instructions.
7 Excess distributions carryover to 2026. Add lines 3j and 4c.
8 Breakdown of line 7:
a Excess from 2021.....
b Excess from 2022.....
c Excess from 2023.....
d Excess from 2024.....
e Excess from 2025.....

Schedule A (Form 990) (2025)

Schedule A (Form 990) 2025

Page 8

Part VI

Supplemental Information. Provide the explanations required by Part II, line 10; Part II, line 17a or 17b; Part III, line 12; Part IV, Section A, lines 1, 2, 3b, 3c, 4b, 4c, 5a, 6, 9a, 9b, 9c, 11a, 11b, and 11c; Part IV, Section B, lines 1 and 2; Part IV, Section C, line 1; Part IV, Section D, lines 2 and 3; Part IV, Section E, lines 1c, 2a, 2b, 3a, 3b, and 3c; Part V, line 1; Part V, Section B, line 1e; Part V Section D, lines 5 and 7; and Part V, Section E, lines 2, 5, and 6. Also complete this part for any additional information. (See instructions).

Facts And Circumstances Test

Return Reference	Explanation

Schedule A (Form 990) 2025

Additional Data

Software ID:
Software Version:

- TIN:

Schedule B
(Form 990)
(Rev. January 2025)

Department of the Treasury
Internal Revenue Service

Schedule of Contributors

Attach to Form 990, 990-EZ, or 990-PF.

Go to www.irs.gov/Form990 for the latest information.

OMB No. 1545-0047

Name of the organization

INTERNATIONAL SOCIETY ON THROMBOSIS
AND HAEMOSTASIS INC

Employer identification number

23-7428305

Organization type (check one):

Filers of:

Section:

Form 990 or 990-EZ

501(c)( ) (enter number) organization

4947(a)(1) nonexempt charitable trust not treated as a private foundation

527 political organization

Form 990-PF

501(c)(3) exempt private foundation

4947(a)(1) nonexempt charitable trust treated as a private foundation

501(c)(3) taxable private foundation

Check if your organization is covered by the General Rule or a Special Rule.
Note: Only a section 501(c)(7), (8), or (10) organization can check boxes for both the General Rule and a Special Rule. See instructions.

General Rule

For an organization filing Form 990, 990-EZ, or 990-PF that received, during the year, contributions totaling $5,000 or more (in money or other property) from any one contributor. Complete Parts I and II. See instructions for determining a contributor's total contributions.

Special Rules

For an organization described in section 501(c)(3) filing Form 990 or 990-EZ that met the 33¹/3% support test of the regulations
under sections 509(a)(1) and 170(b)(1)(A)(vi), that checked Schedule A (Form 990 or 990-EZ), Part II, line 13, 16a, or 16b, and that received from any one contributor, during the year, total contributions of the greater of (1) $5,000 or (2) 2% of the amount on (i) Form 990, Part VIII, line 1h, or (ii) Form 990-EZ, line 1. Complete Parts I and II.

For an organization described in section 501(c)(7), (8), or (10) filing Form 990 or 990-EZ that received from any one contributor,
during the year, total contributions of more than $1,000 exclusively for religious, charitable, scientific, literary, or educational purposes, or for the prevention of cruelty to children or animals. Complete Parts I, II, and III.

For an organization described in section 501(c)(7), (8), or (10) filing Form 990 or 990-EZ that received from any one contributor,
during the year, contributions exclusively for religious, charitable, etc., purposes, but no such contributions totaled more than $1,000. If this box is checked, enter here the total contributions that were received during the year for an exclusively religious, charitable, etc., purpose. Don't complete any of the parts unless the General Rule applies to this organization because it received nonexclusively religious, charitable, etc., contributions totaling $5,000 or more during the year ......... $

Caution: An organization that isn't covered by the General Rule and/or the Special Rules doesn't file Schedule B (Form 990,
990-EZ, or 990-PF), but it must answer “No” on Part IV, line 2, of its Form 990; or check the box on line H of its Form 990-EZ
or on its Form 990PF, Part I, line 2, to certify that it doesn't meet the filing requirements of Schedule B (Form 990,
990-EZ, or 990-PF).

For Paperwork Reduction Act Notice, see the Instructions
for Form 990, 990-EZ, or 990-PF.

Cat. No. 30613XSchedule B (Form 990) (Rev. 1-2025)

Schedule B (Form 990) (Rev. 2025) Page 2

Name of organization INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC

Part I	Contributors (see instructions). Use duplicate copies of Part I if additional space is needed.
(a) No.	(b) Name, address, and ZIP + 4	(c) Total contributions	(d) Type of contribution
RESTRICTED	,	$ RESTRICTED	Person Payroll Noncash (Complete Part II for noncash contributions.)
(a) No.	(b) Name, address, and ZIP + 4	(c) Total contributions	(d) Type of contribution
		$	Person Payroll Noncash (Complete Part II for noncash contributions.)
(a) No.	(b) Name, address, and ZIP + 4	(c) Total contributions	(d) Type of contribution
		$	Person Payroll Noncash (Complete Part II for noncash contributions.)
(a) No.	(b) Name, address, and ZIP + 4	(c) Total contributions	(d) Type of contribution
		$	Person Payroll Noncash (Complete Part II for noncash contributions.)
(a) No.	(b) Name, address, and ZIP + 4	(c) Total contributions	(d) Type of contribution
		$	Person Payroll Noncash (Complete Part II for noncash contributions.)
(a) No.	(b) Name, address, and ZIP + 4	(c) Total contributions	(d) Type of contribution
		$	Person Payroll Noncash (Complete Part II for noncash contributions.)
Schedule B (Form 990) (Rev. 1-2025)

Schedule B (Form 990) (Rev. 1-2025)

Page 3

Name of organization INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC		Employer identification number 23-7428305

Part II	Noncash Property (see instructions). Use duplicate copies of Part II if additional space is needed.
(a) No. from Part I	(b) Description of noncash property given	(c) FMV (or estimate) (See instructions)	(d) Date received
		$
(a) No. from Part I	(b) Description of noncash property given	(c) FMV (or estimate) (See instructions)	(d) Date received
		$
(a) No. from Part I	(b) Description of noncash property given	(c) FMV (or estimate) (See instructions)	(d) Date received
		$
(a) No. from Part I	(b) Description of noncash property given	(c) FMV (or estimate) (See instructions)	(d) Date received
		$
(a) No. from Part I	(b) Description of noncash property given	(c) FMV (or estimate) (See instructions)	(d) Date received
		$
(a) No. from Part I	(b) Description of noncash property given	(c) FMV (or estimate) (See instructions)	(d) Date received
		$
Schedule B (Form 990) (Rev. 1-2025)

Schedule B (Form 990) (Rev. 1-2025)

Page 4


Name of organization INTERNATIONAL SOCIETY ON THROMBOSIS AND HAEMOSTASIS INC			Employer identification number 23-7428305
Part III Exclusively religious, charitable, etc., contributions to organizations described in section 501(c) (7), (8), or (10) that total more than $1,000 for the year from any one contributor. Complete columns (a) through (e) and the following line entry. For organizations completing Part III, enter the total of exclusively religious, charitable, etc., contributions of $1,000 or less for the year. (Enter this information once. See instructions.) $ Use duplicate copies of Part III if additional space is needed.

(a)
No. from Part I

(b) Purpose of gift

(d) Description of how gift is held

(e) Transfer of gift
Transferee's name, address, and ZIP 4	Relationship of transferor to transferee

(a)
No. from Part I

(b) Purpose of gift

(d) Description of how gift is held

(e) Transfer of gift
Transferee's name, address, and ZIP 4	Relationship of transferor to transferee

(a)
No. from Part I

(b) Purpose of gift

(d) Description of how gift is held

(e) Transfer of gift
Transferee's name, address, and ZIP 4	Relationship of transferor to transferee

(a)
No. from Part I

(b) Purpose of gift

(d) Description of how gift is held

(e) Transfer of gift
Transferee's name, address, and ZIP 4	Relationship of transferor to transferee

Schedule B (Form 990) (Rev. 1-2025)

Additional Data

Software ID:
Software Version:

- TIN:

SCHEDULE D
(Form 990)

Department of the Treasury
Internal Revenue Service

Supplemental Financial Statements

Complete if the organization answered "Yes," on Form 990,
Part IV, line 6, 7, 8, 9, 10, 11a, 11b, 11c, 11d, 11e, 11f, 12a, or 12b.
Attach to Form 990.
Go to www.irs.gov/Form990 for instructions and the latest information.

OMB No. 1545-0047

Open to Public Inspection

Name of the organization

INTERNATIONAL SOCIETY ON THROMBOSIS
AND HAEMOSTASIS INC

Employer identification number

23-7428305

Part I

Organizations Maintaining Donor Advised Funds or Other Similar Funds or Accounts. Complete if the organization answered "Yes" on Form 990, Part IV, line 6.

		(a) Donor advised funds	(b) Funds and other accounts
1	Total number at end of year .........
2	Aggregate value of contributions to (during year)
3	Aggregate value of grants from (during year)
4	Aggregate value at end of year ........

Did the organization inform all donors and donor advisors in writing that the assets held in donor advised funds are the organization’s property, subject to the organization’s exclusive legal control? ............

Yes No

Did the organization inform all grantees, donors, and donor advisors in writing that grant funds can be used only for charitable purposes and not for the benefit of the donor or donor advisor, or for any other purpose conferring impermissible private benefit? ...................................

Yes No

Part II

Conservation Easements.
Complete if the organization answered "Yes" on Form 990, Part IV, line 7.

Purpose(s) of conservation easements held by the organization (check all that apply).

Preservation of land for public use (e.g., recreation or education) Preservation of an historically important land area

Protection of natural habitat Preservation of a certified historic structure

Preservation of open space

Complete lines 2a through 2d if the organization held a qualified conservation contribution in the form of a conservation easement on the last day of the tax year.


a	Total number of conservation easements ......................	2a
b	Total acreage restricted by conservation easements ....................	2b
c	Number of conservation easements on a certified historic structure included in (a) .....	2c
d	Number of conservation easements included in (c) acquired after July 25, 2006, and not on a historic structure listed in the National Register ...	2d

Number of conservation easements modified, transferred, released, extinguished, or terminated by the organization during the
tax year

Number of states where property subject to conservation easement is located

Does the organization have a written policy regarding the periodic monitoring, inspection, handling of violations, and enforcement of the conservation easements it holds? ............

Yes No

Staff and volunteer hours devoted to monitoring, inspecting, handling of violations, and enforcing conservation easements during the year

Amount of expenses incurred in monitoring, inspecting, handling of violations, and enforcing conservation easements during the year
$

Does each conservation easement reported on line 2(d) above satisfy the requirements of section 170(h)(4)(B)(i) and section 170(h)(4)(B)(ii)? .............................

Yes No

In Part XIII, describe how the organization reports conservation easements in its revenue and expense statement, and
balance sheet, and include, if applicable, the text of the footnote to the organization’s financial statements that describes
the organization’s accounting for conservation easements.

Part III

Organizations Maintaining Collections of Art, Historical Treasures, or Other Similar Assets.
Complete if the organization answered "Yes" on Form 990, Part IV, line 8.

If the organization elected, as permitted under FASB ASC 958, not to report in its revenue statement and balance sheet works of art, historical treasures, or other similar assets held for public exhibition, education, or research in furtherance of public service, provide, in Part XIII, the text of the footnote to its financial statements that describes these items.

If the organization elected, as permitted under FASB ASC 958, to report in its revenue statement and balance sheet works of art, historical treasures, or other similar assets held for public exhibition, education, or research in furtherance of public service, provide the following amounts relating to these items:

(i)

Revenue included on Form 990, Part VIII, line 1 ......................... $

(ii)

Assets included in Form 990, Part X ............................... $

If the organization received or held works of art, historical treasures, or other similar assets for financial gain, provide the
following amounts required to be reported under FASB ASC 958 relating to these items:

Revenue included on Form 990, Part VIII, line 1 .......................... $

Assets included in Form 990, Part X ............................... $

For Paperwork Reduction Act Notice, see the Instructions for Form 990.

Cat. No. 52283D

Schedule D (Form 990) (Rev. 1-2025)

Page 2

Part III

Organizations Maintaining Collections of Art, Historical Treasures, or Other Similar Assets (continued)

Using the organization’s acquisition, accession, and other records, check any of the following that are a significant use of its collection items (check all that apply):

Public exhibition

Loan or exchange programs

Scholarly research

Other

Preservation for future generations

Provide a description of the organization’s collections and explain how they further the organization’s exempt purpose in
Part XIII.

During the year, did the organization solicit or receive donations of art, historical treasures or other similar
assets to be sold to raise funds rather than to be maintained as part of the organization’s collection?...

Yes No

Part IV

Escrow and Custodial Arrangements. Complete if the organization answered "Yes" on Form 990, Part IV, line 9, or reported an amount on Form 990, Part X, line 21.

Is the organization an agent, trustee, custodian or other intermediary for contributions or other assets not
included on Form 990, Part X? ....................................

Yes No


b	If "Yes," explain the arrangement in Part XIII and complete the following table:		Amount
c	Beginning balance .............................	1c
d	Additions during the year ............................	1d
e	Distributions during the year ..........................	1e
f	Ending balance ................................	1f

Did the organization include an amount on Form 990, Part X, line 21, for escrow or custodial account liability? ...

Yes No

If "Yes," explain the arrangement in Part XIII. Check here if the explanation has been provided in Part XIII ....

Part V

Endowment Funds.
Complete if the organization answered "Yes" on Form 990, Part IV, line 10.

		(a) Current year	(b) Prior year	(c) Two years back	(d) Three years back	(e) Four years back

1a	Beginning of year balance ....	293,209
b	Contributions ...
c	Net investment earnings, gains, and losses	2,779
d	Grants or scholarships ...
e	Other expenditures for facilities and programs ...	295,988
f	Administrative expenses ....
g	End of year balance ......

Provide the estimated percentage of the current year end balance (line 1g, column (a)) held as:

Board designated or quasi-endowment

Permanent endowment

Term endowment

The percentages on lines 2a, 2b, and 2c should equal 100%.

Are there endowment funds not in the possession of the organization that are held and administered for the
organization by:

Yes

(i) Unrelated organizations .................

3a(i)

(ii) Related organizations .................

3a(ii)

If "Yes" on 3a(ii), are the related organizations listed as required on Schedule R? .........

Describe in Part XIII the intended uses of the organization's endowment funds.

Part VI

Land, Buildings, and Equipment.
Complete if the organization answered "Yes" on Form 990, Part IV, line 11a. See Form 990, Part X, line 10.

Description of property		(a) Cost or other basis (investment)	(b) Cost or other basis (other)	(c) Accumulated depreciation	(d) Book value

1a	Land .....
b	Buildings ....	874,073	501,233	372,840
c	Leasehold improvements	252,288	199,826	52,462
d	Equipment ....	257,329	234,774	22,555
e	Other .....
Total. Add lines 1a through 1e. (Column (d) must equal Form 990, Part X, column (B), line 10(c).)..				447,857

Schedule D (Form 990) (Rev. 1-2025)

Page 3

Part VII

Investments - Other Securities.
Complete if the organization answered "Yes" on Form 990, Part IV, line 11b. See Form 990, Part X, line 12.

(a) Description of security or category (including name of security)	(b) Book value	(c) Method of valuation: Cost or end-of-year market value
(1) Financial derivatives.........
(2) Closely-held equity interests........
(3)Other
(A)
(B)
(C)
(D)
(E)
(F)
(G)
(H)
Total. (Column (b) must equal Form 990, Part X, col. (B) line 12.)

Part VIII

Investments - Program Related. Complete if the organization answered 'Yes' on Form 990, Part IV, line 11c. See Form 990, Part X, line 13.

(a) Description of investment	(b) Book value	(c) Method of valuation: Cost or end-of-year market value

(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Total. (Column (b) must equal Form 990, Part X, col.(B) line 13.)

Part IX

Other Assets.
Complete if the organization answered 'Yes' on Form 990, Part IV, line 11d. See Form 990, Part X, line 15.

(a) Description				(b) Book value

(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Total. (Column (b) must equal Form 990, Part X, col.(B) line 15.)...........

Part X

Other Liabilities.
Complete if the organization answered 'Yes' on Form 990, Part IV, line 11e or 11f. See Form 990, Part X, line 25.

1.(a) Description of liability	(b) Book value
(1) Federal income taxes









Total. (Column (b) must equal Form 990, Part X, col.(B) line 25.)
2. Liability for uncertain tax positions. In Part XIII, provide the text of the footnote to the organization's financial statements that reports the organization's liability for uncertain tax positions under FIN 48 (ASC 740). Check here if the text of the footnote has been provided in Part XIII

Schedule D (Form 990) (Rev. 1-2025)

Page 4

Part XI Reconciliation of Revenue per Audited Financial Statements With Revenue per Return. Complete if the organization answered 'Yes' on Form 990, Part IV, line 12a.
1	Total revenue, gains, and other support per audited financial statements .......			1	13,206,659
2	Amounts included on line 1 but not on Form 990, Part VIII, line 12:
a	Net unrealized gains (losses) on investments ....	2a	472,100
b	Donated services and use of facilities .........	2b
c	Recoveries of prior year grants ...........	2c
d	Other (Describe in Part XIII.) ...........	2d
e	Add lines 2a through 2d .....................			2e	472,100
3	Subtract line 2e from line 1..................			3	12,734,559
4	Amounts included on Form 990, Part VIII, line 12, but not on line 1:
a	Investment expenses not included on Form 990, Part VIII, line 7b .	4a	69,392
b	Other (Describe in Part XIII.) ...........	4b
c	Add lines 4a and 4b....................			4c	69,392
5	Total revenue. Add lines 3 and 4c. (This must equal Form 990, Part I, line 12.) ......			5	12,803,951

Part XII Reconciliation of Expenses per Audited Financial Statements With Expenses per Return. Complete if the organization answered 'Yes' on Form 990, Part IV, line 12a.
1	Total expenses and losses per audited financial statements ...........			1	11,878,049
2	Amounts included on line 1 but not on Form 990, Part IX, line 25:
a	Donated services and use of facilities .........	2a
b	Prior year adjustments ............	2b
c	Other losses ................	2c
d	Other (Describe in Part XIII.) ...........	2d
e	Add lines 2a through 2d....................			2e
3	Subtract line 2e from line 1...................			3	11,878,049
4	Amounts included on Form 990, Part IX, line 25, but not on line 1:
a	Investment expenses not included on Form 990, Part VIII, line 7b ..	4a	69,392
b	Other (Describe in Part XIII.) ...........	4b
c	Add lines 4a and 4b.....................			4c	69,392
5	Total expenses. Add lines 3 and 4c. (This must equal Form 990, Part I, line 18.) ......			5	11,947,441

Part XIII

Supplemental Information

Provide the descriptions required for Part II, lines 3, 5, and 9; Part III, lines 1a and 4; Part IV, lines 1b and 2b; Part V, line 4; Part X, line 2; Part XI, lines 2d and 4b; and Part XII, lines 2d and 4b. Also complete this part to provide any additional information.

Return Reference	Explanation
SCHEDULE D, PAGE 2, PART V, LINE 4	THE BOARD DESIGNATED ENDOWMENTS WERE ESTABLISHED TO FUND SUPPORT OF A SPEAKER HONORARIA FOR LECTURES AT THE CONGRESS, TO FUND AWARDS GIVEN BY THE JTH EDITORS TO YOUNG INVESTIGATORS FOR BEST ARTICLE AND TO FUND SSC SUBCOMMITTEE GRANTS. THE ENDOWMENT FUNDS WERE COMLETELY SPENT IN FISCAL YEAR 2021.

Schedule D (Form 990) (Rev. 1-2025)

Additional Data

Software ID:
Software Version:

- TIN:

SCHEDULE F(Form 990)
(Rev. January 2025)

Department of the Treasury
Internal Revenue Service

Statement of Activities Outside the United States

Complete if the organization answered "Yes" to Form 990, Part IV, line 14b, 15, or 16.Attach to Form 990.Go to www.irs.gov/Form990 for instructions and the latest information.

OMB No. 1545-0047

Open to Public Inspection

Name of the organization
INTERNATIONAL SOCIETY ON THROMBOSIS
AND HAEMOSTASIS INC

Employer identification number

23-7428305

Part I

General Information on Activities Outside the United States. Complete if the organization answered "Yes" on Form 990, Part IV, line 14b.

For grantmakers. Does the organization maintain records to substantiate the amount of its grants and

other assistance, the grantees’ eligibility for the grants or assistance, and the selection criteria used

to award the grants or assistance? . . . . . . . . . . . . . . . . . . . . . . . . .

Yes

For grantmakers. Describe in Part V the organization’s procedures for monitoring the use of its grants and other assistance outside the United States.

Activites per Region. (The following Part I, line 3 table can be duplicated if additional space is needed.)

(a) Region		(d) Activities conducted in region (by type) (such as, fundraising, program services, investments, grants to recipients located in the region)	(e) If activity listed in (d) is a program service, describe specific type of service(s) in the region	(f) Total expenditures for and investments in the region
	AFRICA	RTW (2)	SEE PART V	9,750
	AFRICA	ADVOCACY AWARD (1)	SEE PART V	1,000
	EAST ASIA AND THE PACIFIC	FELLOWSHIP (2)	SEE PART V	15,494
	EAST ASIA AND THE PACIFIC	SSC AWARD (2)	SEE PART V	1,580
	EAST ASIA AND THE PACIFIC	RTW (1)	SEE PART V	12,000
	EAST ASIA AND THE PACIFIC	ADVOCACY AWARD (1)	SEE PART V	1,000
	EUROPE	FELLOWSHIP (3)	SEE PART V	20,340
	EUROPE	RSCH GRANTS (7)	SEE PART V	95,257
	EUROPE	RTC ADMIN (2)	SEE PART V	15,395
	EUROPE	RTW (2)	SEE PART V	12,044
	EUROPE	SSC AWARD (5)	SEE PART V	3,475
	EUROPE	EDITOR AWARD (3)	SEE PART V	6,000
	EUROPE	ADVOCACY AWARD (1)	SEE PART V	1,000
	MIDDLE EAST & NORTH AFRICA	RTW (1)	SEE PART V	8,100
	NORTH AMERICA	RSCH GRANTS (2)	SEE PART V	33,657
	NORTH AMERICA	SSC AWARD (1)	SEE PART V	790
	SOUTH AMERICA	RSCH GRANTS (1)	SEE PART V	14,949
	SOUTH AMERICA	RTW (1)	SEE PART V	3,889
3a	Sub-total ....			251,831
b	Total from continuation sheets to Part I ...			3,889
c	Totals (add lines 3a and 3b)			255,720

For Paperwork Reduction Act Notice, see the Instructions for Form 990.Cat. No. 50082W Schedule F (Form 990) (Rev. 1-2025)

Schedule F (Form 990) (Rev. 1-2025)

Page 2

Part II

Grants and Other Assistance to Organizations or Entities Outside the United States. Complete if the organization answered "Yes" on Form 990, Part IV, line 15, for any recipient who received more than $5,000. Part II can be duplicated if additional space is needed.

(c) Region	(d) Purpose of grant	(e) Amount of cash grant	(f) Manner of cash disbursement	(i) Method of valuation (book, FMV, appraisal, other)
NORTH AMERICA	SEE PART V	15,000	WIRE TRANSFER	N/A
NORTH AMERICA	SEE PART V	18,657	WIRE TRANSFER	N/A
EUROPE	SEE PART V	10,000	WIRE TRANSFER	N/A
EUROPE	SEE PART V	50,000	WIRE TRANSFER	N/A
EUROPE	SEE PART V	8,827	WIRE TRANSFER	N/A
EUROPE	SEE PART V	14,285	WIRE TRANSFER	N/A
NORTH AFRICA & MIDDLE EAST	SEE PART V	8,100	WIRE TRANSFER	N/A
SOUTH AMERICA	SEE PART V	14,949	WIRE TRANSFER	N/A

2	Enter total number of recipient organizations listed above that are recognized as charities by the foreign country, recognized as tax-exempt by the IRS, or for which the grantee or counsel has provided a section 501(c)(3) equivalency letter .......	8
3	Enter total number of other organizations or entities .......................

Schedule F (Form 990) (Rev. 1-2025)

Schedule F (Form 990) (Rev. 1-2025)Page 3

Part III

Grants and Other Assistance to Individuals Outside the United States. Complete if the organization answered "Yes" on Form 990, Part IV, line 16.

Part III can be duplicated if additional space is needed.

	(b) Region	(c) Number of recipients	(d) Amount of cash grant	(e) Manner of cash disbursement	(h) Method of valuation (book, FMV, appraisal, other)
FELLOWSHIP STIPEND TRAVEL	EAST ASIA AND THE PACIFIC	2	15,494	WIRE TRANSFER	N/A
RSCH GRANTS	EUROPE	1	20,000	WIRE TRANSFER	N/A
FELLOWSHIP STIPEND,TRAVEL	EUROPE	3	20,340	WIRE TRANSFER	N/A
RTW	AFRICA	1	7,250	WIRE TRANSFER	N/A
RTW	EAST ASIA AND THE PACIFIC	1	12,918	WIRE TRANSFER	N/A
RTW	EUROPE	2	12,044	WIRE TRANSFER	N/A

Schedule F (Form 990) (Rev. 1-2025)

Page 4

Part IV

Foreign Forms

Schedule F (Form 990) (Rev. 1-2025)

Page 5

Part V

Supplemental Information
Provide the information required by Part I, line 2 (monitoring of funds); Part I, line 3, column (f) (accounting method; amounts of investments vs. expenditures per region); Part II, line 1 (accounting method); Part III (accounting method); and Part III, column (c) (estimated number of recipients), as applicable. Also complete this part to provide any additional information. See instructions.

ReturnReference	Explanation
SCHEDULE F, PAGE 1, PART I, LINE 2	THE ISTH REACH-THE-WORLD (RTW) FELLOWSHIP PROGRAM IS TARGETED TO EARLY- CAREER PROFESSIONALS FROM DEVELOPING COUNTRIES (COUNTRIES DESIGNATED AS 'DEVELOPING' BY THE CLASSIFICATION OF THE WORLD BANK). THE OBJECTIVE IS TO PROMOTE ADVANCED KNOWLEDGE AND EXPERTISE IN ONE OR ALL OF THE FOLLOWING AREAS RELATED TO THROMBOSIS AND HEMOSTASIS: MEDICAL CARE; LABORATORY METHODS; AND RESEARCH. ISTH REIMBURSES AIRFARE AND PROVIDES A HOUSING AND PER DIEM STIPEND OF 3,000 PER MONTH TO ALLOW THE FELLOW TO TRAVEL AND TO STUDY AT A HOST INSTITUTE. IN 2025, WE HAD FOUR RTW FELLOWS: ONE FROM AFRICA & MIDDLE EAST REGION, ONE FROM EAST ASIA & PACIFIC REGION, AND TWO FROM EUROPE. IN 2025, WE HAD FIVE FELLOWS: THREE FROM EUROPE AND TWO FROM EAST ASIA AND PACIFIC REGIONS. IN 2025, WE HAD ONE INDIVIDUAL FROM EUROPE TO RECEIVE A RESEARCH GRANT TO SUPPORT THROMBOEMBOLIC EVENTS WITH AMIVANTAMB-BASED THERAPIES IN PATIENTS WITH CANCER.
SCHEDULE F, PAGE 1, PART I, LINE 3	AFRICA 9,750 0 AFRICA 1,000 0 EAST ASIA AND THE PACIFIC 15,494 0 EAST ASIA AND THE PACIFIC 1,580 0 EAST ASIA AND THE PACIFIC 12,000 0 EAST ASIA AND THE PACIFIC 1,000 0 EUROPE 20,340 0 EUROPE 95,257 0 EUROPE 15,395 0 EUROPE 12,044 0 EUROPE 3,475 0 EUROPE 6,000 0 EUROPE 1,000 0 MIDDLE EAST & NORTH AFRICA 8,100 0 NORTH AMERICA 33,657 0 NORTH AMERICA 790 0 SOUTH AMERICA 14,949 0 SOUTH AMERICA 3,889 0
SCHEDULE F, PAGE 5, PART V	PART II, LINE 1, COLUMN (D) - GRANTS TO ORGANIZATIONS OUTSIDE THE UNITED STATES RECIPIENT 1: 18,657 IN FUNDING TO SUPPORT RESEARCH IN TRANEXAMIC ACID IN HEAVY MENSTRUAL BLEEDING RECIPIENT 2: 15,000 IN FUNDING TO SUPPORT RESEARCH OF BIOBANKING RARE PLATELET ANTIBODIES RECIPIENT 3: 10,000 IN FUNDING TO SUPPORT THE RESEARCH OF THE CHARACTERISTICS OF CYCLIC THROMBOCYTOPENIA RECIPIENT 4: 50,000 IN FUNDING TO SUPPORT THE RESEARCH OF COAGULATION MEETS CALCIFICATION: GLADIATORS AS PROTECTORS OF VASCULAR INTEGRITY RECIPIENT 5: 8,827 IN FUNDING TO SUPPORT THE RESEARCH AND VALIDATION OF ANTI-AAV ASSAYS RECIPIENT 6: 14,285 IN FUNDING TO SUPPORT THE TRAVEL OF PROFESSIONAL SPEAKERS TO A SUPPORTED COURSE IN MOLDOVA - MOLDAVIAN SOCIETY ON THROMBOSIS AND HAEMOSTASIS RECIPIENT 7: 8,100 IN FUNDING TO SUPPORT THE TRAVEL AND ACCOMMODATIONS OF PROFESSIONAL SPEAKERS TO A SUPPORTED COURSE IN TANZANIA RECIPIENT 8: 14,949 IN FUNDING TO SUPPORT THE TRAVEL OF PROFESSIONAL SPEAKERS TO A SUPPORTED COURSE IN MONTEVIEDO, URUGUAY - CLAHT

Schedule F (Form 990) (Rev. 1-2025)

Additional Data

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Schedule I
(Form 990)
(Rev. January 2025)

Department of the Treasury
Internal Revenue Service

Grants and Other Assistance to Organizations,
Governments and Individuals in the United States

Complete if the organization answered "Yes," on Form 990, Part IV, line 21 or 22.
Attach to Form 990.
Go to www.irs.gov/Form990 for instructions and the latest information.

OMB No. 1545-0047

Open to Public
Inspection

Name of the organization
INTERNATIONAL SOCIETY ON THROMBOSIS
AND HAEMOSTASIS INC

Employer identification number
23-7428305

Part I

General Information on Grants and Assistance

Does the organization maintain records to substantiate the amount of the grants or assistance, the grantees' eligibility for the grants or assistance, and
the selection criteria used to award the grants or assistance? ........................

Yes No

Describe in Part IV the organization's procedures for monitoring the use of grant funds in the United States.

Part II

Grants and Other Assistance to Domestic Organizations and Domestic Governments. Complete if the organization answered "Yes" on Form 990, Part IV, line 21, for any recipient

that received more than $5,000. Part II can be duplicated if additional space is needed.

(a) Name and address of organization or government	(b) EIN	(c) IRC section (if applicable)	(d) Amount of cash grant	(h) Purpose of grant or assistance
(1) THE REGENTS OF THE UNIV OF MICHIGAN 3003 SOUTH STATE STREET 5TH FLOOR WOLVERINE TOWER ANN ARBOR,MI48109	38-6006309	GOV	17,700	FUNDAMENTAL RESEARCH
(2) UNIVERSITY OF NORTH CAROLINA 104 AIRPORT DRIVE CHAPEL HILL,NC27516	56-6001393	GOV	50,000	FUNDAMENTAL RESEARCH
(3) BRIGHAM AND WOMEN'S HOSPITAL 75 FRANCIS STREET BOSTON,MA02115	04-2312909	GOV	50,000	FUNDAMENTAL RESEARCH
(4) ENDEAVOR HEALTH 1301 CENTRAL STREET EVANSTON,IL60201	36-2167060	GOV	12,419	PERIPOERATIVE CARE

Enter total number of section 501(c)(3) and government organizations listed in the line 1 table .................

Enter total number of other organizations listed in the line 1 table ........................ .

For Paperwork Reduction Act Notice, see the Instructions for Form 990.

Cat. No. 50055P

Schedule I (Form 990) Rev. 1-2025

Page 2

Part III

Grants and Other Assistance to Domestic Individuals. Complete if the organization answered "Yes" on Form 990, Part IV, line 22.
Part III can be duplicated if additional space is needed.

(a) Type of grant or assistance	(b) Number of recipients	(c) Amount of cash grant	(d) Amount of noncash assistance	(e) Method of valuation (book, FMV, appraisal, other)	(f) Description of noncash assistance

(1)
(2)
(3)
(4)
(5)
(6)
(7)

Part IV

Supplemental Information. Provide the information required in Part I, line 2; Part III, column (b); and any other additional information.

Return Reference	Explanation

Schedule I (Form 990) Rev. 1-2025

Additional Data

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Schedule J
(Form 990)
(Rev. January 2025)

Department of the Treasury
Internal Revenue Service

Compensation Information

For certain Officers, Directors, Trustees, Key Employees, and Highest
Compensated Employees
Complete if the organization answered "Yes" on Form 990, Part IV, line 23.
Attach to Form 990.
Go to www.irs.gov/Form990 for instructions and the latest information.

OMB No. 1545-0047

Open to Public Inspection

Name of the organization

INTERNATIONAL SOCIETY ON THROMBOSIS
AND HAEMOSTASIS INC

Employer identification number

23-7428305

Part I

Questions Regarding Compensation

Yes

Check the appropiate box(es) if the organization provided any of the following to or for a person listed on Form
990, Part VII, Section A, line 1a. Complete Part III to provide any relevant information regarding these items.

First-class or charter travel Housing allowance or residence for personal use

Travel for companions Payments for business use of personal residence

Tax idemnification and gross-up payments Health or social club dues or initiation fees

Discretionary spending account Personal services (e.g., maid, chauffeur, chef)

If any of the boxes on Line 1a are checked, did the organization follow a written policy regarding payment or reimbursement or provision of all of the expenses described above? If "No," complete Part III to explain .....

Yes

Did the organization require substantiation prior to reimbursing or allowing expenses incurred by all
directors, trustees, officers, including the CEO/Executive Director, regarding the items checked on Line 1a? ....

Yes

Indicate which, if any, of the following the filing organization used to establish the compensation of the
organization's CEO/Executive Director. Check all that apply. Do not check any boxes for methods
used by a related organization to establish compensation of the CEO/Executive Director, but explain in Part III.

Compensation committee Written employment contract

Independent compensation consultant Compensation survey or study

Form 990 of other organizations Approval by the board or compensation committee

During the year, did any person listed on Form 990, Part VII, Section A, line 1a, with respect to the filing organization or a related organization:

Receive a severance payment or change-of-control payment? .............

Participate in, or receive payment from, a supplemental nonqualified retirement plan? .........

Participate in, or receive payment from, an equity-based compensation arrangement? .........

If "Yes" to any of lines 4a-c, list the persons and provide the applicable amounts for each item in Part III.

Only 501(c)(3), 501(c)(4), and 501(c)(29) organizations must complete lines 5-9.

For persons listed on Form 990, Part VII, Section A, line 1a, did the organization pay or accrue any
compensation contingent on the revenues of:

The organization? ....................

Any related organization? .......................

If "Yes," on line 5a or 5b, describe in Part III.

For persons listed on Form 990, Part VII, Section A, line 1a, did the organization pay or accrue any
compensation contingent on the net earnings of:

The organization? ..................

Any related organization? ......................

If "Yes," on line 6a or 6b, describe in Part III.

For persons listed on Form 990, Part VII, Section A, line 1a, did the organization provide any nonfixed
payments not described in lines 5 and 6? If "Yes," describe in Part III ............

Were any amounts reported on Form 990, Part VII, paid or accured pursuant to a contract that was
subject to the initial contract exception described in Regulations section 53.4958-4(a)(3)? If "Yes," describe
in Part III ..........................

If "Yes" on line 8, did the organization also follow the rebuttable presumption procedure described in Regulations section 53.4958-6(c)? .........................

For Paperwork Reduction Act Notice, see the Instructions for Form 990.

Cat. No. 50053T

Schedule J (Form 990) (Rev. 1-2025)

Page 2

Part II

Officers, Directors, Trustees, Key Employees, and Highest Compensated Employees. Use duplicate copies if additional space is needed.

For each individual whose compensation must be reported on Schedule J, report compensation from the organization on row (i) and from related organizations, described in the
instructions, on row (ii). Do not list any individuals that are not listed on Form 990, Part VII.
Note. The sum of columns (B)(i)-(iii) for each listed individual must equal the total amount of Form 990, Part VII, Section A, line 1a, applicable column (D) and (E) amounts for that individual.

(A) Name and Title		(B) Breakdown of W-2, 1099-MISC compensation, and/or 1099-NEC			(C) Retirement and other deferred compensation	(D) Nontaxable benefits	(E) Total of columns (B)(i)-(D)	(F) Compensation in column (B) reported as deferred on prior Form 990
(A) Name and Title		(i) Base compensation	(ii) Bonus & incentive compensation	(iii) Other reportable compensation	(C) Retirement and other deferred compensation	(D) Nontaxable benefits	(E) Total of columns (B)(i)-(D)
1THOMAS REISER EXECUTIVE DIRECTOR	(i) (ii)	385,551 -------------	-------------	-------------	36,734 -------------	17,750 -------------	440,035 -------------	-------------
2LISA ASTORGA DIR MEETINGS	(i) (ii)	192,528 -------------	-------------	-------------	19,565 -------------	1,284 -------------	213,377 -------------	-------------
3LOUISE BANNON DIR MEMBRSHIP MKTG	(i) (ii)	198,498 -------------	-------------	-------------	19,850 -------------	11,370 -------------	229,718 -------------	-------------
4JEFFREY CAIOLA DIR FINANCE & OPS	(i) (ii)	185,289 -------------	-------------	-------------	18,890 -------------	16,788 -------------	220,967 -------------	-------------
5ROBERT CLARK DIR PROGRAMS	(i) (ii)	171,593 -------------	-------------	-------------	18,350 -------------	24,277 -------------	214,220 -------------	-------------
6ERICKA ROBSINSON DIR PEOPLE CULTURE	(i) (ii)	165,205 -------------	-------------	-------------	16,881 -------------	16,745 -------------	198,831 -------------	-------------

Schedule J (Form 990) (Rev. 1-2025)

Page 3

Part III

Supplemental Information

Provide the information, explanation, or descriptions required for Part I, lines 1a, 1b, 3, 4a, 4b, 4c, 5a, 5b, 6a, 6b, 7, and 8, and for Part II. Also complete this part for any additional information.

Return Reference	Explanation

Schedule J (Form 990) (Rev. 1-2025)

Additional Data

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SCHEDULE O
(Form 990)
(Rev. January 2025)
Department of the Treasury
Internal Revenue Service

Supplemental Information to Form 990 or 990-EZ

Complete to provide information for responses to specific questions on
Form 990 or 990-EZ or to provide any additional information.
Attach to Form 990 or 990-EZ.
Go to www.irs.gov/Form990 for instructions and the latest information.

OMB No. 1545-0047

Open to Public
Inspection

Name of the organization

INTERNATIONAL SOCIETY ON THROMBOSIS
AND HAEMOSTASIS INC

Employer identification number

23-7428305

Return Reference	Explanation
FORM 990 - ORGANIZATION'S 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.
FORM 990, PAGE 2, PART III, LINE 4D	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.
FORM 990, PAGE 6, PART VI, LINE 6	THE SOCIETY HAS THE FOLLOWING CLASSES OF MEMBERSHIP: PREMIER, ADVANCED PRACTICE PROVIDER (APP) PHARMACIST, ASSOCIATE, MEDICAL RESIDENT/POST DOC, REACH-THE-WORLD, NURSE, ALLIED HEALTH PROFESSIONAL, STUDENT/TRAINEE, ISTH ACADEMY AND EMERITUS.
FORM 990, PAGE 6, PART VI, LINE 7A	THE MEMBERS ELECT 15 DIRECTORS TO THE BOARD OF DIRECTORS KNOWN AS THE COUNCIL.
FORM 990, PAGE 6, PART VI, LINE 7B	THE BYLAWS MAY BE AMENDED OR REPEALED AND NEW BYLAWS ADOPTED BY THE AFFIRMATIVE VOTE OF TWO-THIRDS OF THE MEMBERS VOTING, EITHER BY MAIL OR IN PERSON AT A REGULAR MEETING OF THE MEMBERSHIP, PROVIDED THE PROPOSED CHANGE HAS BEEN SUBMITTED TO THE MEMBERSHIP AT LEAST THREE (3) MONTHS PRIOR TO THE MEETING.
FORM 990, PAGE 6, PART VI, LINE 11B	THE EXECUTIVE DIRECTOR AND TREASURER OF THE CORPORATION REVIEW THE FORM 990 WHICH IS THEN MADE AVAILABLE TO THE INTERNATIONAL BOARD OF DIRECTORS PRIOR TO FILING.
FORM 990, PAGE 6, PART VI, LINE 12C	ALL VOTING MEMBERS OF ISTH COUNCIL, ALL CHAIRS OF SSC SCIENTIFIC SUBCOMMITTEES AND SPEAKERS AT ISTH AND SSC MEETINGS ARE REQUIRED TO SUBMIT DISCLOSURE OF INTEREST/LOYALTY STATEMENTS ANNUALLY WHICH ARE KEPT ON FILE AT HEADQUARTERS. ALL MEDICAL JOURNAL AUTHORS SUBMIT COI DISCLOSURES KEPT ON FILE BY THE EDITORIAL OFFICE.
FORM 990, PAGE 6, PART VI, LINE 15A	COMPENSATION FOR ALL HIGHLY COMPENSATED STAFF IS ROUTINELY REVIEWED AND APPROVED BY EXEC. COMMITTEE OF THE BOARD BASED ON COMPARABLE DATA FOR SIMILAR POSITIONS IN SIMILAR ORGANIZATIONS FOR SIMILAR LONGEVITY, WITH WRITTEN DOCUMENTATION IN PERSONNEL FILE AND PAYROLL RECORDS. PERSONNEL EXPENSES ARE REPORTED ANNUALLY TO THE BOARD AND APPROVED AS PART OF THE BUDGET.
FORM 990, PAGE 6, PART VI, LINE 15B	OFFICERS AND DIRECTORS DO NOT RECEIVE COMPENSATION FOR THEIR SERVICES.
FORM 990, PAGE 6, PART VI, LINE 18	PRIOR YEARS' 990S ARE AVAILABLE ON GUIDESTAR.ORG AND ON THE IRS WEBSITE (HTTPS://APPS.IRS.GOV/APP/EOS/)
FORM 990, PAGE 6, PART VI, LINE 19	THE SOCIETY'S NAME AND ADDRESS OF REGISTERED OFFICE/AGENT ARE AVAILABLE TO THE PUBLIC ON THE NC SECRETARY OF STATE WEB SITE: HTTP://WWW.SECRETARY.STATE.NC.US. THE BYLAWS AND MISSION ARE POSTED ON THE ISTH WEBPAGE. FINANCIAL STATEMENTS, THE ARTICLES OF INCORPORATION, FORM 1023 AND THE CONFLICT OF INTEREST POLICY ARE AVAILABLE BY REQUEST TO ISTH HEADQUARTERS.
FORM 990, PART IX, LINE 11G	TECHNOLOGY SERVICES 114,345 6,722 1,076 HR SERVICES 31,905 20,307 3,252 EDITORIAL ASSISTANT 120,000 0 0 OTHER CONTRACTED SERVICES 14,724 9,372 1,501 EDUCATION 479,517 0 0 GUIDANCE AND GUIDELINES 199,601 0 0 GENE THERAPY 89,843 0 0 NOVEL THERAPIES IN THROMBOSIS 209,470 0 0 SSC 25,918 0 0 SUBCOMMITTEES 22,575 0 0 WORLD THROMBOSIS DAY 83,454 0 0 JTH JOURNAL 1,234 0 0 MEMBERSHIP 500 0 0 TOTAL 1,393,086 36,401 5,829

For Paperwork Reduction Act Notice, see the Instructions for Form 990 or 990-EZ.

Cat. No. 51056K

Schedule O (Form 990) (Rev. 1-2025)

Additional Data

Software ID:
Software Version:

1	Briefly describe the organization’s mission or most significant activities: TO FURTHER RESEARCH & EDUCATION ON THE MAJOR DISEASE OF THROMBOSIS AND DISORDERS OF HAEMOSTASIS.
2	Check this box
3	Number of voting members of the governing body (Part VI, line 1a) ........	3	21
4	Number of independent voting members of the governing body (Part VI, line 1b) .....	4	21
5	Total number of individuals employed in calendar year 2025 (Part V, line 2a) ......	5	36
6	Total number of volunteers (estimate if necessary) .............	6	175
7a	Total unrelated business revenue from Part VIII, column (C), line 12 ........	7a	0
b	Net unrelated business taxable income from Form 990-T, Part I, line 11 .........	7b

		Prior Year	Current Year
8	Contributions and grants (Part VIII, line 1h) .........	2,298,293	2,360,597
9	Program service revenue (Part VIII, line 2g) .........	7,461,959	9,084,122
10	Investment income (Part VIII, column (A), lines 3, 4, and 7d ) ....	1,438,508	1,359,922
11	Other revenue (Part VIII, column (A), lines 5, 6d, 8c, 9c, 10c, and 11e)	-21,621	-690
12	Total revenue—add lines 8 through 11 (must equal Part VIII, column (A), line 12)	11,177,139	12,803,951
13	Grants and similar amounts paid (Part IX, column (A), lines 1–3 )...	398,446	407,330
14	Benefits paid to or for members (Part IX, column (A), line 4).....		0
15	Salaries, other compensation, employee benefits (Part IX, column (A), lines 5–10)	4,880,261	4,549,055
16a	Professional fundraising fees (Part IX, column (A), line 11e) .....		0
b	Total fundraising expenses (Part IX, column (D), line 25) 313,937
17	Other expenses (Part IX, column (A), lines 11a–11d, 11f–24e)....	7,942,430	6,991,056
18	Total expenses. Add lines 13–17 (must equal Part IX, column (A), line 25)	13,221,137	11,947,441
19	Revenue less expenses. Subtract line 18 from line 12.......	-2,043,998	856,510
		Beginning of Current Year	End of Year
20	Total assets (Part X, line 16).............	17,709,554	18,797,413
21	Total liabilities (Part X, line 26).............	3,769,527	3,528,776
22	Net assets or fund balances. Subtract line 21 from line 20.....	13,940,027	15,268,637

Sign Here

	Signature of officer	Date

	Type or print name and title


4a	(Code: ) (Expenses $ 5,487,426 including grants of $ ) (Revenue $ 6,170,445 )
	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.

4b	(Code: ) (Expenses $ 1,976,294 including grants of $ 285,658 ) (Revenue $ )
	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.

4c	(Code: ) (Expenses $ 545,515 including grants of $ 3,000 ) (Revenue $ )
	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.

	(Code: ) (Expenses $ 1,549,567 including grants of $ 118,672 ) (Revenue $ 2,913,677 )
	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.

4d	Other program services (Describe in Schedule O.)
	(Expenses $ 1,549,567 including grants of $ 118,672 ) (Revenue $ 2,913,677 )
4e	Total program service expenses9,558,802

(A) Name and title	(B) Average hours per week (list any hours for related organizations below dotted line)	(C) Position (do not check more than one box, unless person is both an officer and a director/trustee)			(D) Reportable compensation from the organization (W-2/1099-MISC/1099-NEC)	(E) Reportable compensation from related organizations (W-2/1099-MISC/1099-NEC)	(F) Estimated amount of other compensation from the organization and related organizations
(A) Name and title
(18) FIONNUALA NI ANILE........................................................................ DIRECTOR	1.00 .......................	X			3,000	0	0
(19) FERNANDA ORSI........................................................................ DIRECTOR	1.00 .......................	X			0	0	0
(20) THOMAS REISER........................................................................ EXECUTIVE DI	40.00 .......................		X		385,551	0	54,484
(21) LISA ASTORGA........................................................................ DIR MEETINGS	40.00 .......................			X	192,528	0	20,849
(22) LOUISE BANNON........................................................................ DIR MEMBRSHI	40.00 .......................			X	198,498	0	31,220
(23) JEFFREY CAIOLA........................................................................ DIR FINANCE	40.00 .......................			X	185,289	0	35,678
(24) ROBERT CLARK........................................................................ DIR PROGRAMS	40.00 .......................			X	171,593	0	42,627
(25) ERICKA ROBSINSON........................................................................ DIR PEOPLE C	40.00 .......................			X	165,205	0	33,626

1b	Sub-Total..............
c	Total from continuation sheets to Part VII, Section A..
d	Total (add lines 1b and 1c).........	1,301,664	218,484

(A) Name and business address	(B) Description of services	(C) Compensation
HIGHER LOGIC LLC 1919 N LYNN ST STE 500 ARLINGTON,VA222091744	ONLINE PLATFORM	152,113




2 Total number of independent contractors (including but not limited to those listed above) who received more than $100,000 of compensation from the organization 1

1a	Federated campaigns..		1a
b	Membership dues..		1b	701,783
c	Fundraising events..		1c
d	Related organizations		1d
e	Government grants (contributions)		1e

f	All other contributions, gifts, grants, and similar amounts not included above		1f	1,658,814

g	Noncash contributions included in lines 1a - 1f:$		1g

h Total. Add lines 1a-1f.......		2,360,597

		Business Code
2a	EXHIBITION INCOME	900099	3,141,250	3,141,250
b	REGISTRATION FEES	900099	3,029,195	3,029,195
c	OTHER INCOME	900099	1,692,026	1,692,026
d	PUBLICATION INCOME	511120	1,221,651	1,221,651
e
f	All other program service revenue.
g	Total. Add lines 2a–2f .....		9,084,122

3 Investment income (including dividends, interest, and othersimilar amounts) ......			440,264			440,264
4 Income from investment of tax-exempt bond proceeds
5 Royalties...........
			(i) Real	(ii) Personal
6a	Gross rents	6a
b	Less: rental expenses	6b
c	Rental income or (loss)	6c
d	Net rental income or (loss).......
			(i) Securities	(ii) Other
7a	Gross amount from sales of assets other than inventory	7a	15,409,868
b	Less: cost or other basis and sales expenses	7b	14,490,210
c	Gain or (loss)	7c	919,658
d	Net gain or (loss).........			919,658	919,658
8a	Gross income from fundraising events (not including $ of contributions reported on line 1c). See Part IV, line 18 ....
			8a
b	Less: direct expenses ...		8b
c	Net income or (loss) from fundraising events..
9a	Gross income from gaming activities. See Part IV, line 19 ...
			9a
b	Less: direct expenses ...		9b
c	Net income or (loss) from gaming activities..
10a	Gross sales of inventory, less returns and allowances ..
			10a
b	Less: cost of goods sold ..		10b
c	Net income or (loss) from sales of inventory..

Business Code
11a	GAIN(LOSS) FOREIGN CURRENCY		900099	-690	-690
b
c
d	All other revenue ....
e	Total. Add lines 11a–11d ......			-690
12	Total revenue. See instructions.....			12,803,951	10,003,090		440,264

1	Grants and other assistance to domestic organizations and domestic governments. See Part IV, line 21 ....	153,279	153,279
2	Grants and other assistance to domestic individuals. See Part IV, line 22 ...........
3	Grants and other assistance to foreign organizations, foreign governments, and foreign individuals. See Part IV, lines 15 and 16. .............	254,051	254,051
4	Benefits paid to or for members .......
5	Compensation of current officers, directors, trustees, and key employees ...........	385,551	221,938	140,846	22,767
6	Compensation not included above, to disqualified persons (as defined under section 4958(f)(1)) and persons described in section 4958(c)(3)(B) .........
7	Other salaries and wages........	3,025,408	1,741,541	1,105,216	178,651
8	Pension plan accruals and contributions (include section 401(k) and 403(b) employer contributions) ....	322,037	185,377	117,644	19,016
9	Other employee benefits .......	573,737	330,265	209,592	33,880
10	Payroll taxes ...........	242,322	139,490	88,523	14,309
11	Fees for services (non-employees):
a	Management ......
b	Legal .........	102,090	83,929	16,312	1,849
c	Accounting ...........	14,000	8,053	5,126	821
d	Lobbying ...........
e	Professional fundraising services. See Part IV, line 17
f	Investment management fees ......	69,392		69,392
g	Other (If line 11g amount exceeds 10% of line 25, column (A) amount, list line 11g expenses on Schedule O)	1,435,316	1,393,086	36,401	5,829
12	Advertising and promotion ....
13	Office expenses .......	80,442	56,013	21,079	3,350
14	Information technology ......
15	Royalties ..
16	Occupancy ...........
17	Travel ............	199,630	71,563	121,826	6,241
18	Payments of travel or entertainment expenses for any federal, state, or local public officials .
19	Conferences, conventions, and meetings ....	4,243,368	4,243,368
20	Interest ...........
21	Payments to affiliates .......
22	Depreciation, depletion, and amortization ..	50,877	29,266	18,628	2,983
23	Insurance ...
24	Other expenses. Itemize expenses not covered above (List miscellaneous expenses in line 24e. If line 24e amount exceeds 10% of line 25, column (A) amount, list line 24e expenses on Schedule O.)
a	OTHER OPERATING EXPENSES	482,171	340,395	118,453	23,323
b	HONORARIA	293,025	293,025
c	BANK CHARGES AND FEES	20,745	14,163	5,664	918
d
e	All other expenses
25	Total functional expenses. Add lines 1 through 24e	11,947,441	9,558,802	2,074,702	313,937
26	Joint costs. Complete this line only if the organization reported in column (B) joint costs from a combined educational campaign and fundraising solicitation. Check here if following SOP 98-2 (ASC 958-720).

1	Cash–non-interest-bearing ........			654,126	1	1,904,728
2	Savings and temporary cash investments .........			642,950	2	238,641
3	Pledges and grants receivable, net ......				3
4	Accounts receivable, net .............			1,825,004	4	1,706,464
5	Loans and other receivables from any current or former officer, director, trustee, key employee, creator or founder, substantial contributor, or 35% controlled entity or family member of any of these persons .......
					5
6	Loans and other receivables from other disqualified persons (as defined under section 4958(f)(1)), and persons described in section 4958(c)(3)(B) ...
					6
7	Notes and loans receivable, net ...........				7
8	Inventories for sale or use ............				8
9	Prepaid expenses and deferred charges ......			445,347	9	1,027,840
10a	Land, buildings, and equipment: cost or other basis. Complete Part VI of Schedule D	10a	1,383,690
b	Less: accumulated depreciation	10b	935,833	497,929	10c	447,857
11	Investments—publicly traded securities .			13,446,344	11	13,098,428
12	Investments—other securities. See Part IV, line 11 .....				12
13	Investments—program-related. See Part IV, line 11 ..				13
14	Intangible assets ...............				14
15	Other assets. See Part IV, line 11 ...........			197,854	15	373,455
16	Total assets. Add lines 1 through 15 (must equal line 33)...			17,709,554	16	18,797,413

17	Accounts payable and accrued expenses .....	1,109,223	17	762,058
18	Grants payable ...		18
19	Deferred revenue .........	2,660,304	19	2,766,718
20	Tax-exempt bond liabilities .........		20
21	Escrow or custodial account liability. Complete Part IV of Schedule D		21
22	Loans and other payables to any current or former officer, director, trustee, key employee, creator or founder, substantial contributor, or 35% controlled entity or family member of any of these persons .........
			22
23	Secured mortgages and notes payable to unrelated third parties ..		23
24	Unsecured notes and loans payable to unrelated third parties ..		24
25	Other liabilities (including federal income tax, payables to related third parties, and other liabilities not included on lines 17 - 24). Complete Part X of Schedule D		25
26	Total liabilities. Add lines 17 through 25..	3,769,527	26	3,528,776

	Organizations that follow FASB ASC 958, check here and complete lines 27, 28, 32, and 33.
27	Net assets without donor restrictions ..........	13,840,027	27	15,178,637
28	Net assets with donor restrictions ...........	100,000	28	90,000
	Organizations that do not follow FASB ASC 958, check here and complete lines 29 through 33.
29	Capital stock or trust principal, or current funds .....		29
30	Paid-in or capital surplus, or land, building or equipment fund ...		30
31	Retained earnings, endowment, accumulated income, or other funds		31
32	Total net assets or fund balances ...........	13,940,027	32	15,268,637
33	Total liabilities and net assets/fund balances ........	17,709,554	33	18,797,413

1	Was the organization a U.S. transferor of property to a foreign corporation during the tax year? If "Yes," the organization may be required to file Form 926, Return by a U.S. Transferor of Property to a Foreign Corporation (see Instructions for Form 926). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Yes	No
2	Did the organization have an interest in a foreign trust during the tax year? If "Yes," the organization may be required to separately file Form 3520, Annual Return to Report Transactions with Foreign Trusts and Receipt of Certain Foreign Gifts, and/or Form 3520-A, Annual Information Return of Foreign Trust With a U.S. Owner (see Instructions for Forms 3520 and 3520-A; don't file with Form 990). . . . . . . . . . . . . . . . . . . . . . . .	Yes	No
3	Did the organization have an ownership interest in a foreign corporation during the tax year? If "Yes," the organization may be required to file Form 5471, Information Return of U.S. Persons with Respect to Certain Foreign Corporations. (see Instructions for Form 5471). . . . . . . . . . . . . . . . . . . . . . . . . . . .	Yes	No
4	Was the organization a direct or indirect shareholder of a passive foreign investment company or a qualified electing fund during the tax year? If “Yes,” the organization may be required to file Form 8621, Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund. (see Instructions for Form 8621) .	Yes	No
5	Did the organization have an ownership interest in a foreign partnership during the tax year? If "Yes," the organization may be required to file Form 8865, Return of U.S. Persons with Respect to Certain Foreign Partnerships (see Instructions for Form 8865). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	Yes	No
6	Did the organization have any operations in or related to any boycotting countries during the tax year? If "Yes," the organization may be required to separately file Form 5713, International Boycott Report (see Instructions for Form 5713; don't file with Form 990).. . . . . . . . . . . . . . . . . . . . . . . . . . . .	Yes	No