Milane Frantz’s net worth over time
Only dates with a published estimate are shown. Nothing is filled in between. Tap or hover a bar to see the source.
See the numbers as a table
| Date | Estimate | Source |
| 2019 | $5.9 billion | Forbes World's Billionaires List 2019 |
| 2020 | $3.6 billion | Forbes World's Billionaires List 2020 |
| 2021 | $6 billion | Forbes World's Billionaires List 2021 |
| 2022 | $6.6 billion | Forbes World's Billionaires List 2022 |
| 2023 | $6.8 billion | Forbes World's Billionaires List 2023 |
| 2024 | $7.6 billion | Forbes World's Billionaires List 2024 |
| 2025 | $9.2 billion | Forbes World's Billionaires List 2025 |
| 2026 | $10.1 billion | Forbes World's Billionaires List 2026 |
| Oct 2026 | $11.2 billion | Forbes Real-Time Billionaires · Forbes real-time estimate |
Where the money comes from
These are the main sources of wealth named in the reporting we cite. No published source breaks the total into exact amounts, so we do not show percentages.
Milane Frantz’s fortune in real-life terms
Based on the Forbes Real-Time Billionaires estimate above. Median full-time U.S. pay is $65,416 a year ($1,258 a week, BLS, Q2 2026), before taxes. Typical (median) U.S. family net worth is $216,100 (Federal Reserve, 2025 Survey of Consumer Finances).
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Milane Frantz has an estimated net worth of $11.2 billion, according to Forbes Real-Time Billionaires, Milane Frantz profile (figures as of October 20, 2026). That is up from $5.9 billion in 2019.
Milane Frantz is an American investor and one of the heirs to the Duncan family fortune, which comes from the Houston pipeline giant Enterprise Products Partners. She was born in 1970 to Barbara Ann and Dan Duncan. Her father founded the company in 1968, built it into one of the biggest energy businesses in America and took it public in 1998.
Frantz and her three siblings inherited a stake in Enterprise Products after their father died in 2010. Of the four, only her sister Randa Duncan Williams is involved in running the business. Frantz lives in Houston, where she is a board member of the Hermann Park Conservancy and a director of the Duncan Family Foundation. She married Matthew J. Frantz in 2001.
Where Milane Frantz's money comes from
Her wealth comes from her share of the family stake in Enterprise Products Partners. The company moves oil, natural gas and other energy products across the country. Forbes says it now owns over 50,000 miles of oil pipelines and the largest oil storage facility on the Gulf Coast. Pipelines earn fees on the volumes they carry, which tends to make income steady. That stability is a big reason the family's stake has held its value over time.
The inheritance came with an unusual twist. Because the federal estate tax was temporarily repealed for the year 2010, the Duncan children became the first American billionaires to pay no estate tax since it was created. Frantz describes herself as an investor, and her fortune has grown along with the company's value and payouts.
How Forbes has valued Milane Frantz
Forbes valued Frantz at $5.9 billion in 2019. Her fortune fell to $3.6 billion in 2020, when energy markets were hit hard, then recovered to $6 billion in 2021. It has risen every year since, reaching $6.6 billion in 2022, $6.8 billion in 2023 and $7.6 billion in 2024.
The climb sped up after that. Forbes put her at $9.2 billion in 2025 and $10.1 billion on its 2026 World's Billionaires List. As of October 20, 2026, the Forbes real-time billionaires tracker showed $11.2 billion, her highest figure so far, as Enterprise Products kept rewarding its owners. Over that stretch, her fortune nearly doubled from its 2021 level.
Career and money timeline
- 1968
Her father, Dan Duncan, founded Enterprise Products Partners in Houston.
- 1998
Enterprise Products Partners went public.
- 2010
Frantz and her siblings inherited stakes in the company.
- 2026
Forbes estimated her fortune at $10.1 billion on its World's Billionaires List.
Milane Frantz net worth FAQ
What is Milane Frantz's net worth?
Milane Frantz's net worth is an estimated $11.2 billion, according to Forbes Real-Time Billionaires, Milane Frantz profile (October 20, 2026). It is an estimate, not an official figure.
How did Milane Frantz get so rich?
The main sources named in the reporting we cite are: Pipelines.
Is Milane Frantz a billionaire?
Yes. Forbes Real-Time Billionaires estimates Milane Frantz is worth $11.2 billion.
How has Milane Frantz's net worth changed?
The earliest published estimate we track is $5.9 billion (2019, Forbes World's Billionaires List 2019). The latest is $11.2 billion (October 20, 2026).
Does Milane Frantz work at Enterprise Products?
No. Forbes says only her sister Randa Duncan Williams is involved in the business. Frantz is an investor and serves on nonprofit boards in Houston.
Sources
- Forbes Real-Time Billionaires, Milane Frantz profile (October 20, 2026)
- Forbes World's Billionaires List 2019, Milane Frantz profile (March 5, 2019)
- Forbes World's Billionaires List 2020, Milane Frantz profile (April 8, 2020)
- Forbes World's Billionaires List 2021, Milane Frantz profile (April 6, 2021)
- Forbes World's Billionaires List 2022, Milane Frantz profile (April 5, 2022)
- Forbes World's Billionaires List 2023, Milane Frantz profile (April 4, 2023)
- Forbes World's Billionaires List 2024, Milane Frantz profile (April 2, 2024)
- Forbes World's Billionaires List 2025, Milane Frantz profile (April 2025)
- Forbes World's Billionaires List 2026, Milane Frantz profile (March 10, 2026)
- U.S. Bureau of Labor Statistics, Usual Weekly Earnings (Q2 2026) (July 2026)
- Federal Reserve, 2025 Survey of Consumer Finances (median family net worth, Table 4) (October 2026)
- Background facts: Wikipedia, Milane Frantz (accessed October 28, 2026). Used for career facts only, never for figures.
Every number on this page is an estimate published by the source named next to it. We never fill in years with our own guesses. How we handle estimates.