Nonprofit · EIN 83-1506360
CTBUH SEATTLE
Tax-exempt · SEATTLE, WA 98101
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990-PF | $1,114 | $2,386 | -$1,272 | $0 | $0 | $0 |
| December 31, 2024 | 990-PF | $13,070 | $7,081 | $5,989 | $21,589 | $0 | $21,589 |
| December 31, 2023 | 990-PF | $1,592 | $391 | $1,201 | $15,600 | $0 | $15,600 |
Financial details: 990-PF for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $1,114
Expenses
- Grants and similar amounts paid
- $0
Balance sheet and other
- Total assets, start of year
- $0
- Total assets, end of year
- $0
- Total liabilities, end of year
- $0
- Net assets, end of year
- $0
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990-PF for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| WILLIAM MAIBUSCH 16400 Southcenter Parkway STE 501, Seattle, WA 98101 | Secretary | 0 | $0 |
| SEAN CANADY 1301 Fifth Ave STE 3200, Seattle, WA 98101 | Chair | 0 | $0 |
| ROGER HEERINGA 1700 7th Avenue STE Suite 1700, Seattle, WA 98101 | Treasurer | 0 | $0 |
990-PF for the year ended December 31, 2024: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| WILLIAM MAIBUSCH 16400 Southcenter Parkway STE 501, Seattle, WA 98101 | Secretary | 0 | $0 |
| SEAN CANADY 1301 Fifth Ave STE 3200, Seattle, WA 98101 | Chair | 0 | $0 |
| ROGER HEERINGA 818 Stewart Street STE 1000, Seattle, WA 98101 | Treasurer | 0 | $0 |
990-PF for the year ended December 31, 2023: 7 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| WILLIAM MAIBUSCH 16400 Southcenter Parkway Ste 501, Seattle, WA 98101 | Secretary | 0 | $0 |
| RYAN MULLENIX 223 Yale Ave, Seattle, WA 98101 | ViceChair | 0 | $0 |
| SEAN CANADY 1301 Fifth Ave Ste 3200, Seattle, WA 98101 | Chairman | 0 | $0 |
| ROGER HEERINGA 818 Stewart Street Ste 1000, Seattle, WA 98101 | Treasurer | 0 | $0 |
| TODD ENOKI 1420 5th Ave Ste 2400, Seattle, WA 98101 | Director | 0 | $0 |
| JOOYEOL OH 1101 2nd Ave Ste 100, Seattle, WA 98101 | Director | 0 | $0 |
| MAY SO 1201 Alaskan Way Ste 200, Seattle, WA 98101 | Director | 0 | $0 |
Address and contacts
- Address (IRS master file)
- 1420 5TH AVE STE 4200, SEATTLE, WA 98101-2375
- In care of
- % ROGER HEERINGA
- Signed the 990-PF
- ROGER HEERINGA, Treasurer
- Phone
- (206) 787-8428
What it must file and when
IRS records say it files Form 990-PF. Private foundations file every year. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990-PF on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990-PF on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990-PF on file |
IRS record
- EIN
- 83-1506360
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Private non-operating foundation
- Donations deductible (Pub 78)
- Private foundation, 30% limit
- Exempt since
- 2018
- Accounting year ends
- December
- Files
- Form 990-PF
- Category (NTEE)
- Science and technology (U03)
- Assets (IRS master file)
- $1
- Income (IRS master file)
- $1,114
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-PF | December 2025 | $1,114 | $2,386 | $0 | IRS |
| 990-PF | December 2024 | $13,070 | $7,081 | $21,589 | IRS |
| 990-PF | December 2023 | $1,592 | $391 | $15,600 | XML |
| 990-PF | December 2022 | – | – | – | IRS |
| 990-PF | December 2021 | – | – | – | IRS |
| 990-PF | December 2020 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 83-1506360).
Questions about CTBUH SEATTLE
- What is the EIN of CTBUH SEATTLE?
- The employer identification number (EIN) of CTBUH SEATTLE is 83-1506360.
- Is CTBUH SEATTLE tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2018.
- Are donations to CTBUH SEATTLE tax-deductible?
- Yes. It is listed in IRS Publication 78 (Private foundation, 30% limit).
- Which annual return does CTBUH SEATTLE file?
- Form 990-PF. Private foundations file every year.
- When is the next return of CTBUH SEATTLE due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did CTBUH SEATTLE last file with the IRS?
- The latest return in the IRS public files is the 990-PF for the year ended December 2025.
- Who are the officers and directors of CTBUH SEATTLE?
- The 990-PF for the year ended December 31, 2025 lists 3 people; 0 received compensation from the organization.
- How much revenue does CTBUH SEATTLE have?
- On its 990-PF for the year ended December 31, 2025 it reported revenue of $1,114, expenses of $2,386 and total assets of $0 at year end.
Other nonprofits in SEATTLE
- THE ALLEN INSTITUTE FOR ARTIFICIAL INTELLIGENCE EIN 82-4083177 · last filed 990-PF for 2024
- INSTITUTE FOR SYSTEMS BIOLOGY EIN 91-2003593 · last filed 990 for 2024
- SAGE BIONETWORKS EIN 26-4489946 · last filed 990 for 2024
- KAPHAN FOUNDATION EIN 65-1211107 · last filed 990-PF for 2024
- ASTROPHYSICAL RESEARCH CONSORTIUM EIN 91-1265806 · last filed 990 for 2024
- BLUE MARBLE SPACE EIN 27-0184094 · last filed 990 for 2025
- AMERICAN AUTOMATIC CONTROL COUNCIL EIN 11-6017940 · last filed 990 for 2024
- EARTH & SPACE RESEARCH EIN 91-1663391 · last filed 990 for 2025
All nonprofits in SEATTLE · Washington · Science and technology