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US nonprofit · EIN 831782268 · Washington, DCiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 831782268) - 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 2024: assets, liabilities, staff, website, telephone, pay.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.Principal officer IRS Form 990-N (e-Postcard) - principal officer named for tax year 2018.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

Horizontal

Donations deductible
Revenue
$800k
year to 31 December 2024
Expenses
$857k
year to 31 December 2024
Total assets
$147k
$32k liabilities
Net assets
$116k
assets less liabilities
Directors and trustees
3
3.4y av
Staff
1
employees, year to 31 December 2024
Left since last filing
0
no seats appear to have opened
Officers and senior staff
1
named in Part VII
How am I connected?

Horizontal's network

3 peoplei3 people on this map.The large node is the subject of this page. Solid lines are what the register itself records (3). Form 990 filings give names without a person identifier; SEC insider filings carry a CIK.

The board

3 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.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 3 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Joseph BrennanBoard Member2023
3 yrs
Raphael MimounExecutive Director2023
3 yrs
Trinh NguyenBoard Member2023
3 yrs
Under 5 years5 to 6 years6 years or more

Officers and senior leadership

1 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Raphael MimounExecutive Directorsince 2020

Pay and hours

year to 31 December 2024iFrom 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
Raphael MimounExecutive Director40$76k$4k
Trinh NguyenBoard Member2$0
Joseph BrennanBoard Member2$0

About

Legal name
Horizontal
EIN
831782268
Address
1100 13th St Nw Ste 800, Washington, DC, 20005-4281
State
District of Columbia
Mission
Horizontals mission is to empower communities around the world through education and technology. (as filed on the Form 990)
Activity (NTEE)
Q32 International, foreign affairs and national security
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
International, Foreign Affairs & National Security
Size band
4 (IRS master file code)
Formed
2018
Principal officer
Raphael Mimoun (as named on the Form 990)
IRS ruling date
1 November 2018
Status
Code 01 (unconditional exemption)
Form 990 filings on record
1, latest 2023
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥3years on the filingsJoseph Brennan
≥3years on the filingsRaphael Mimoun
≥3years on the filingsTrinh Nguyen

Latest return

year to 31 December 2024iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2024. US dollars, as filed.
Total assets
$147k
Total liabilities
$32k
Net assets or fund balances
$116k
Contributions and grants received
$647k
Program service revenue
$150k
Employees
1

State registration

1 entityiBusiness-entity registers published by US states. These records are matched to this organisation by name and state, not by EIN, and are labelled as likely matches. Street addresses are not shown.
Horizontal likely matchiMatched by exact name and state (and ZIP where shown). State registers do not publish EINs, so this is not a confirmed match. Source: DC Department of Licensing and Consumer Protection (DLCP), corporate registrations (opendata.dc.gov). Licence: CC BY 4.0. Attribution: DC DLCP. Data last fetched 18 October 2026.
State
District of Columbia
Entity type
Domestic Nonprofit Corporation
Status
Active - In Good Standing
Formed
4 September 2018
Registered agent
Registered Agents Inc. (city and state not held)