Billionaire Profile

Global Rank

#305

Image: Public domain | via Wikimedia Commons

Milane Frantz

CEO, Enterprise Products Partners

Real-Time Net Worth

$10.5B

As of December 2025

Age

Source

Pipelines

Industry

energy

Citizenship

Biography

Milane Frantz (born 1970) is a US citizen and billionaire heiress, deriving her wealth from her stake in Enterprise Products, a pipeline and energy infrastructure company. Following her father, Dan Duncan's, death in 2010, she and her siblings inherited a significant portion of his fortune, estimated at $3.1 billion. Residing in Houston, Texas, Frantz is known for her philanthropic endeavors, particularly in education and healthcare. She is involved with the Duncan Family Foundation and the Hermann Park Conservancy.

Wealth Over Time

Portfolio Holdings

Enterprise Products Partners

In-Depth Profile

Early Life

Milane Diane Frantz (née Duncan) was born in 1970 to Barbara Ann and Dan Duncan. Her father, Dan Duncan, co-founded Enterprise Products in 1968, a Houston-based pipeline giant. She grew up in a wealthy family and attended private schools in Houston, Texas.

Rise to Success

Frantz inherited a significant fortune following her father's death in 2010. She and her siblings benefited from a temporary repeal in the estate tax law that year, becoming some of the first American billionaires to pay no estate tax.

Key Business Strategies

Milane Frantz is primarily an investor. She is not involved in the day-to-day operations of Enterprise Products. Her focus is on managing her inherited wealth and engaging in philanthropic activities.

Philanthropy

Frantz is involved with the Duncan Family Foundation, and also serves on the board of Houston's Hermann Park Conservancy. She is known for her contributions to charitable organizations, focusing on education and healthcare.

Career Milestones

1970

Birth

Born to Barbara Ann and Dan Duncan.

2001

Marriage

Married Matthew J. Frantz.

2010

Inheritance

Inherited a stake in Enterprise Products after her father's death.

2014

Widowhood

Husband Matthew J. Frantz passed away.

Philanthropy & Social Impact

Various

Duncan Family Foundation

$XX

Actively involved as a director. The specific amount is not readily available.

Community

Hermann Park Conservancy

$XX

Serves on the board.