William Stephen Tellam Foundation

San Diego, CA. EIN 93-1565366. Reported $22,349 of revenue for 2025 on its Form 990-PF.

The IRS record

Registered name: WILLIAM STEPHEN TELLAM FOUNDATION; As the IRS records it, which is how it appears in their own search.
Employer Identification Number: 93-1565366; The identifier the IRS uses for this organization.
Recognized under: 501(c)(3) — charitable, religious, educational, scientific; The subsection of the code its exemption was granted under.
Recognized in: 2024; The year of the IRS ruling.
Classification: Philanthropy, Voluntarism and Grantmaking Foundations; NTEE code T20, assigned at registration.
Gifts to it: Contributions are deductible; Whether the IRS treats a contribution to this organization as deductible.
Legal form: Corporation; How the organization is constituted, as recorded at registration.
Location of record: San Diego, CA; The address the IRS holds, not necessarily where it operates.
Most recent filing: Form 990-PF; For tax year 2025.

What it reported for 2025

What these figures are, and what they are not

Each figure is what the organization reported on its own return, as the IRS published it. The IRS does not audit the return before publishing it.

A private foundation reports its assets twice. Book value is what it paid for them; fair market value is what they are worth now, and it is usually the larger of the two. Rankings on this site use book value, because that is the only measure a Form 990 and a Form 990-EZ also report, which keeps a foundation comparable with the charities beside it.

William Stephen Tellam Foundation reported paying Warren Magill, President, $2,835 for 2025. That is reportable compensation from the organization, from related organizations, and other compensation, as the organization reported all three. It is not a verified salary and not take-home pay.

$22,349
Total revenue: Contributions, grants, program service revenue and investment income.; $50,628
Total expenses: As reported on the return.; $256.4 thousand
Total assets, book value: $256,448; At the end of the year, at what the organization paid for them.; $256.4 thousand
Total assets, fair market value: $256,448; What they are worth now. Only a Form 990-PF reports this.; 3
People listed: Officers, directors, trustees, key employees and highest-paid employees.; $2,835
Largest reported compensation: Reported for Warren Magill.

How this compares

Total revenue: $22,349, 2025: By the revenue it reported, ranks 604,981st of 685,136 organizations with revenue on their return nationally, 66,373rd of 75,784 in California and 59,401st of 73,016 in Philanthropy, Voluntarism and Grantmaking Foundations. Larger than 11% of the 685,136 organizations with revenue on their return nationally. It is < 0.1% of the $4,505,194,528,546 reported by every organization with a return on record.
Largest reported compensation: $2,835, 2025: By the largest compensation it reported paying, ranks 249,373rd of 261,691 organizations reporting compensation nationally, 24,348th of 25,016 in California and 17,931st of 19,258 in Philanthropy, Voluntarism and Grantmaking Foundations. Larger than 4% of the 261,691 organizations reporting compensation nationally.

Similar organizations

Other organizations in the same state and category as William Stephen Tellam Foundation
Organization	Revenue
JEN-HSUN & Lori Huang Foundation	$5,930,032,620
Silicon Valley Community Foundation	$4,889,245,872
Gordon E and Betty I Moore Foundation	$2,663,649,577
Good Ventures Foundation	$1,505,225,400
CHAN Zuckerberg Initiative Foundation	$1,494,476,554
Sergey Brin Family Foundation	$985,621,463

This organization elsewhere

IRS Tax Exempt Organization Search — the exemption record this page is built from. Search for EIN 93-1565366; the IRS search has no address that opens one organization directly.
ProPublica Nonprofit Explorer — the same filings with scanned returns going back further. Reporting by ProPublica.

More in California and under Philanthropy, Voluntarism and Grantmaking Foundations. All organizations: nonprofits.

What this page cannot show

Everything here is what the organization told the IRS about itself. The IRS publishes returns as filed and does not audit them first.
The figures describe the most recent year on record, which is usually one to two years behind, and not the organization’s current position.
Nothing here says whether the organization does its work well, or how it spends what it raises beyond the totals on the form.

Something wrong? Tell us. Full method at methodology.

Sources

Exempt Organizations Business Master File — Internal Revenue Service · Public domain — U.S. Government work · retrieved September 21, 2026
Form 990 series e-file data · retrieved September 19, 2026

Data retrieved September 19, 2026