The William K. Warren Foundation

Private foundation · EIN 73-0609599 · since 1947williamkwarrenfoundation.org·Oklahoma, Tulsa·Updated 13 October 2026

At a glance

$22.2M

Annual giving, 2024 tax year

From the Form 990-PF filing

Open to applications

Rolling, no deadlines · unsolicited applications welcome

Key takeaways

The filing does not state a grant range, so you should not assume a size for your request; the foundation paid $22,185,143 in the year, but that total says little about typical grants, so check its website before setting an amount.
Its stated priority is Northeast Oklahoma and Tulsa, so work based there fits best, and its health-care giving prefers local Catholic health care facilities, with particular interest in organisations with proven strategies to prevent, diagnose and treat mental illness.
The filing gives no deadlines, though it notes that the foundation accepts applications; the application steps are not set out in the filing and are directed to its website.
Given these preferences, lead with how your work matches its themes and your local area, and make clear any Catholic connection your organisation has.

Overview

The William K. Warren Foundation is a US private foundation based in Tulsa, OK.

What they fund

Profile derived from the foundation's IRS Form 990-PF filings (TY2024, TY2023, TY2022) and its website, with every statement checked against those sources. Sources read on 7 October 2026.

Priority Areas

The Foundation directs giving towards medical research that advances diagnosis, treatment and cures, using local resources. Its health-care support seeks to improve physical and spiritual wellbeing for Oklahomans. It supports northeast Oklahoma health-education organisations serving people who are physically and mentally challenged and their families. Catholic initiatives receive the greatest emphasis, especially Catholic education through local schools, universities, ministries and the Diocese. Community efforts focus on beautification, economic development and healthier lifestyles. It also supports organisations improving wellness and care in northeast Oklahoma, with particular interest in proven approaches to preventing, diagnosing and treating mental illness. Scholarship programmes support medical students in selected fields who are committed to practising in Oklahoma.

Themes

Medical research
Health care services
Health education
Catholic initiatives
Healthy lifestyles
Beautification and economic development
Mental illness

Geographic Focus

Priority: Northeast Oklahoma; Tulsa.

How to apply

The filing directs applicants to the website for the application; it does not set out the application steps in the filing.

Application success factors

What the foundation says:

The Foundation gives preference to local Catholic health care facilities.
It has particular interest in organisations with proven strategies to prevent, diagnose and treat mental illness.

Officers and directors

W W O'Connor — Director
S K Warren — Director & Senior Vice President
W K Warren jr — Director & Chairman Emeritus
M S Blankenship — Director
A N Warren — Director
J Pierce — Treasurer
D McManus — Assistant Secretary
J Adams — Secretary
M E Young — Director
F W Murphy III — Director
D Affeldt — Assistant Treasurer
T Cooper — President & Director(Beg 5/24)
J-K C Warren — CEO & Chairman (Beginning 5/24)

From the latest Form 990-PF filing

3 years of tax filings

Year	Total expenses	Grants paid	Assets	Filing document
2022 tax year	$25,642,380	$21,106,890	$454,938,908	Filing for 2022 tax year
2023 tax year	$27,729,284	$21,283,613	$490,367,225	Filing for 2023 tax year
2024 tax year	$28,385,574	$22,185,143	$515,250,513	Filing for 2024 tax year

Figures from the foundation’s IRS Form 990-PF filings. Assets are at fair market value at year end. The document icon links to each year’s filing on ProPublica Nonprofit Explorer.