- Is Arrillaga Foundation a tax-exempt 501(c)(3)?
- Yes — Arrillaga Foundation is recognised by the IRS as a 501(c)(3) organisation (EIN 33-4119201). The IRS recognised Arrillaga Foundation as tax-exempt in November 2025.
- What is Arrillaga Foundation's EIN?
- Arrillaga Foundation's Employer Identification Number (EIN) is 33-4119201. The EIN was assigned by the IRS in November 2025. Donors and grantmakers use the EIN to verify tax-exempt status with the IRS.
- What does Arrillaga Foundation do?
- Arrillaga Foundation is registered with the IRS as a philanthropy & grantmaking nonprofit organisation. A detailed mission statement is not available on its most recent Form 990 filing.
- Where is Arrillaga Foundation located?
- Arrillaga Foundation is located at 2450 Watson CT, Palo Alto, CA, 94303-3216.
- When was Arrillaga Foundation founded or recognised by the IRS?
- Arrillaga Foundation was recognised by the IRS as a tax-exempt organisation in November 2025. The IRS ruling date is the earliest authoritative date available for most US nonprofits.
