The Ott Family Foundation

The Prioleau Family Foundation

Houston, TX

Enterprise Holdings Foundation

Saint Louis, MO

The Enterprise Holdings Foundation supports education, environmental stewardship, disaster relief, hunger relief, health, arts, and community needs, with emphasis on organizations connected to Enterprise employees, their families, or established customers. It gives across communities where Enterprise operates; its 2024 median grant was $3,000, though grants ranged widely. Applications are accepted at any time, but the profile does not say whether unsolicited requests are accepted.

Walter M & Mary Mischer Foundation

Houston, TX

ESB3 Foundation

Houston, TX

ESB3 Foundation supports charitable organizations across areas including culture, health, disability services, community needs, and education, with 2024 grants going to recipients in Texas and Pennsylvania. Its 12 grants ranged from $5,000 to $1.35 million, with a median of $50,000; it does not accept unsolicited requests and gives only to preselected organizations.

William S & Lora Jean Kilroy Foundation

Katy, TX

The William S & Lora Jean Kilroy Foundation supports organizations in areas including education, arts and museums, conservation, health, and social services, with 2024 grants going to recipients in Houston, Texas, and Atlanta, Georgia. Grants ranged from $200 to $270,000, with a median of $5,000. It accepts requests by letter to William S Kilroy Jr and does not restrict giving to preselected organizations.

The John M O'Quinn Foundation

Houston, TX

This Houston-based private foundation distributes approximately $15 million annually to support conservation, education, healthcare, and programs serving underprivileged youth, with typical grants ranging from $10,000 to $2.5 million. While headquartered in Texas, the foundation funds organizations across Texas, New York, and North Carolina, with a particular emphasis on the Houston area and surrounding communities. The foundation maintains substantial assets of over $280 million and has demonstrated significant commitment to major healthcare initiatives and youth-focused programs in its region.

The Cullen Foundation

Houston, TX

The Cullen Foundation supports high-performing organizations in arts, education, healthcare, public service and related areas, focusing on initiatives that benefit the Greater Houston area. Its 2024 grants ranged from $40,000 to $3 million, with a median award of $250,000. It accepts unsolicited Letters of Intent online, but full applications are by invitation.

The Cockrell Foundation

Houston, TX

The Cockrell Foundation supports higher education, healthcare and medical research, youth initiatives, and cultural and community organizations, prioritizing Greater Houston and initiatives at UT Austin’s Cockrell School of Engineering. Its 2024 grants ranged from $103 to $4,016,163, with a median of $20,000; it says it is not accepting unsolicited funding requests.

Laurie and Reed Morian Foundation

Houston, TX

The Laurie and Reed Morian Foundation supports museums and cultural organizations, education, conservation, livestock and rodeo activities, and community organizations, with most 2024 funding going to Texas recipients. Its 2024 grants ranged from $700 to $775,000, with a median of $5,000. The profile does not state whether it accepts unsolicited requests.

Alvin & Lucy Owsley Foundation

Houston, TX

The Alvin & Lucy Owsley Foundation supports a broad range of charitable organizations, including arts and culture, education, health, religious groups, libraries, and parks, primarily in Texas. Its 2024 grants ranged from $250 to $99,890, with a median of $5,000. It does not limit giving to preselected organizations; applicants are asked to send a letter of no more than two pages, and the stated geographic restriction is Texas.

The Brown Foundation Inc

Houston, TX

The Brown Foundation funds education and arts as top priorities, along with human services, healthcare, civic assets, and conservation, primarily in greater Houston, with selective support elsewhere in Texas and beyond. Its 2025 grants ranged from $20,000 to $11 million, with a median of $50,000. New applicants may start with an online pre-application; the Foundation does not accept requests by post or email.

The Elkins Foundation

Houston, TX

The Elkins Foundation funds education, healthcare, cultural, community, and religious organizations and projects, especially those serving Houston and the Greater Gulf Coast. Its 2025 grants ranged from about $11,000 to $1.5 million, with a median of $100,000. It accepts unsolicited requests through an online application, due by June 30.