Skip to main content
IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 46-4009945

STEM MARIN FUND

Tax-exempt · NOVATO, CA 94947

Financials

$86K$29K2025
Revenue Expenses · by fiscal year end
Financials of STEM MARIN FUND by year, from its e-filed returns
Year endedFormRevenueExpensesNet incomeTotal assetsLiabilitiesNet assets
December 31, 2025990-EZ$86,226$28,807$57,419$108,459–$108,459
Financial details: 990-EZ for the year ended December 31, 2025

Revenue

Contributions, gifts and grants
$54,979
Investment income
$39
Net income from fundraising events
$30,825
Other revenue
$383

Expenses

Compensation of officers, directors and key employees
$0
Professional fees and payments to contractors
$230
Printing, publications and postage
$618
Other expenses
$27,959
Program services (functional)
$28,190

Balance sheet and other

Total assets, start of year
$51,040
Total assets, end of year
$108,459
Total liabilities, end of year
–
Net assets, end of year
$108,459
Cash, savings and investments
$108,459
Gross receipts
$93,386

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-EZ for the year ended December 31, 2025, highest compensation first.

NameTitleHours / weekCompensation
Melissa HavelDirector0$0
Erin NickersonDirector0$0
Susan TakahashiDirector0$0
Chirsty BronDirector0$0
Vicky BartholoDirector0$0
Bjorn OvickDirector0$0

Address and contacts

Address (IRS master file)
936A DIABLO AVE 101, NOVATO, CA 94947-0000
In care of
% REGINA BIANUCCI RUS
Mailing address (990-N for 2024)
936A Diablo Ave 101, Novato CA 94947
Principal officer (990-N for 2024)
Theresa Rosiak, 936A Diablo Ave 101, Novato CA 94947
Signed the 990-EZ
Bjorn Ovick, Director
Phone
(415) 798-5194
Return prepared by
Regina Bianucci Rus CPA

Mission

STEM Marin Fund is organized to raise funds to help support the STEM Marin Science, Technology, Engineering and Math program at San Marin High School in Novato, California. Our chief activity is to raise funds to support the program, including speakers who have interesting technology or science-related professions. The fund will disburse funds according to the supplemental needs of teachers with funding to go toward project materials, classroom supplies, tools and instruments, technology and field trips.

990-EZ for the year ended December 31, 2025

Program accomplishments

  • The STEM Marin Fund continued its mission in 2025 to expand and enhance STEM education opportunities for students through fundraising, program support, and experiential learning initiatives. During the year, the organization hosted its annual fundraising event, which brought together community members, educators, families, and local supporters to raise funds for STEM-focused educational programs. Proceeds from these efforts helped fund Engineering Capstone projects, enabling students to design, build, and present real-world engineering solutions, as well as Biotechnology end-of-year student projects that provided hands-on scientific research and collaborative learning experiences. In addition, the organization supported numerous educational field trips designed to expose students to STEM careers, universities, laboratories, and industry environments, helping deepen student engagement and inspire future academic and professional pathways in science, technology, engineering, and mathematics.
    Expenses $28,190

What it must file and when

IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025December 31, 2025May 15, 2026990-EZ on file
2024December 31, 2024May 15, 2025990-N on file
2023December 31, 2023May 15, 2024No data

File the 2026 990-EZ for STEM MARIN FUND

Due May 17, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
46-4009945
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Publicly supported organization (170(b)(1)(A)(vi))
Donations deductible (Pub 78)
Public charity, 50% deduction limit
Exempt since
2014
Accounting year ends
December
Files
Form 990 or 990-EZ
Category (NTEE)
Education (B112)
Assets (IRS master file)
$108,459
Income (IRS master file)
$93,386

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-EZDecember 2025–––IRS
990-N for 2024
Officer: Theresa Rosiak
December 31, 2024≤ $50,000 receipts––e-Postcard

990-N: the IRS publishes only the latest e-Postcard per organization; earlier years appear here as 990.tax collects the monthly files. 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.

Questions about STEM MARIN FUND

What is the EIN of STEM MARIN FUND?
The employer identification number (EIN) of STEM MARIN FUND is 46-4009945.
Is STEM MARIN FUND tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2014.
Are donations to STEM MARIN FUND tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does STEM MARIN FUND file?
Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
When is the next return of STEM MARIN FUND 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 STEM MARIN FUND last file with the IRS?
The latest return in the IRS public files is the 990-EZ for the year ended December 2025.
Who is the principal officer of STEM MARIN FUND?
The 990-N for 2024 names Theresa Rosiak.
Who are the officers and directors of STEM MARIN FUND?
The 990-EZ for the year ended December 31, 2025 lists 6 people; 0 received compensation from the organization.
How much revenue does STEM MARIN FUND have?
On its 990-EZ for the year ended December 31, 2025 it reported revenue of $86,226, expenses of $28,807 and total assets of $108,459 at year end.

Other nonprofits in NOVATO

All nonprofits in NOVATO · California · Education