Background and career
Milane Diane Frantz (née Duncan, born 1970) is a billionaire heir to the Duncan family fortune through Enterprise Products, which remains under family control.
Milane Frantz was born in 1970 to Barbara Ann and Dan Duncan. Her father, Dan Duncan, was the co-founder of Enterprise Products.
Frantz is an investor. She inherited $3.1B upon the death of her father. Due to a temporary repeal in the estate tax law for the year 2010, Duncan's children became the first American billionaires to pay no estate tax since its enactment. Frantz's net worth is $4.3 billion, as of April 2020.
On July 28, 2001, she married Matthew J. Frantz, the son of Philip and Judy (Erhardt) Frantz. He died on September 4, 2014, aged 45. She lives in Houston, Texas.
Sources
Net-worth figure: Celebrity Net Worth (October 2026), in USD. Biography and career facts: the person's Wikipedia article and linked reporting. Snapshot date for all StarWorth figures: 28 October 2026.
