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US nonprofit · EIN 923242587 · San Francisco, CAiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 923242587) - NTEE activity code, address.Board and officers IRS Form 990 annual filings, Part VII (directors, trustees, officers, key employees), read year by year to observe tenure.Latest return IRS Form 990 series e-file data - 990 for the year to 31 December 2025: assets, liabilities, staff, website, telephone, pay.Finances by year IRS Form 990 e-file data - total revenue and total expenses by tax year.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue (us-approach-v4-clean). Not a statement that the organisation is recruiting.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

Undauntedk12

Donations deductible
Revenue
$1.8m
year to 31 December 2025
Expenses
$1.5m
year to 31 December 2025
Total assets
$2.3m
$60k liabilities
Net assets
$2.2m
assets less liabilities
Directors and trustees
5
2.9y av
Staff
8
3 volunteers
Left since last filing
0
no seats appear to have opened
Officers and senior staff
2
named in Part VII
How am I connected?

Undauntedk12's network

5 people5 organisationsi5 people and 5 organisations on this map.The large node is the subject of this page. Solid lines are what the register itself records (5). Violet dotted lines (5) are likely: the same full name sits on the current board of another organisation in the same register and region. Form 990 filings give names without a person identifier; SEC insider filings carry a CIK. It may be a different person.

The board

5 listediTime on the board is observed from the annual filings: the IRS files no appointment date, so the bar counts years from the first filing the person appears on - a lower bound, not a filed start date. Names are exactly as filed. The IRS publishes no person identifier, so this edition does not yet link a person across organisations in the tables. The network map shows same-name matches as likely links only, never as confirmed.Tenure and departures are observed across annual filings. Observed tenure is a lower bound - a member may have joined before the first year on record. The organisation reported 5 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Brenda CasselliusDirector2024
2 yrs
Emma BloombergDirector2024
2 yrs
Greg NelsonTreasurer2023
3 yrs
Jonathan KleinCEO & CoFounder2023
3 yrs
Sara RossCoFounder/Sctry2023
3 yrs
Under 5 years5 to 6 years6 years or more

Officers and senior leadership

2 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Sarah HeineChief of Staffsince 2024
Stephanie SeidmonProgram Director2024

Pay and hours

year to 31 December 2025iFrom Part VII of the Form 990: compensation reported for each officer, director, trustee, key employee and highest-paid staff member, and the average hours a week they report. Most board members are unpaid; a blank means nothing was reported. Pay from related organisations is shown separately.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Jonathan KleinCEO & CoFounder40$283k$55k
Sarah HeineChief of Staff40$165k$34k
Sara RossCoFounder/Sctry40$64k$2k
Greg NelsonTreasurer2$0
Emma BloombergDirector2$0
Brenda CasselliusDirector2$0

About

Legal name
Undauntedk12
EIN
923242587
Address
548 Market St PMB 83811, San Francisco, CA, 94104-5401
State
California
Mission
UndauntedK12 is working to ensure that every student has the opportunity to attend a safe, healthy, and resilient school. (as filed on the Form 990)
Activity (NTEE)
C01 Environment
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Environment
Size band
6 (IRS master file code)
Formed
2023
Principal officer
Jonathan Klein (as named on the Form 990)
IRS ruling date
1 July 2023
Status
Code 01 (unconditional exemption)
Form 990 filings on record
3, latest 2025
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥3years on the filingsGreg Nelson
≥3years on the filingsJonathan Klein
≥3years on the filingsSara Ross
≥2years on the filingsBrenda Cassellius

Latest return

year to 31 December 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2025. US dollars, as filed.
Total assets
$2.3m
Total liabilities
$60k
Net assets or fund balances
$2.2m
Contributions and grants received
$1.7m
Program service revenue
$127k
Employees
8
Volunteers
3

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2024$2.2m$1.2m$1m

As filed on the IRS Form 990. US dollars.