Julia Koch and family
- Net worth $81 billion
- Birthday April 12, 1962
- Status -
- Country United States
- Source(-s) of wealth Businesswoman, Philanthropist, Socialite
How much is Julia Koch and family Worth? Julia Koch and family Net Worth in 2026
Julia Koch and family’s net worth is estimated at $81 billion as of November 2026. She and her three children inherited 42% of Koch, Inc. when David Koch died in 2019. The company says it has reinvested more than $190 billion in itself since 2003, and 42% of that comes to $79.8 billion, almost exactly the value we put on the family’s stake.
| Net worth | $81 billion (our estimate for the four heirs, range $65 billion to $95 billion) |
|---|---|
| Born | Julia Koch: April 12, 1962, Des Moines, Iowa |
| Age | 64 |
| Country | United States |
| Known for | Widow of David Koch; Koch board member |
| Main income sources | Koch, Inc. stake, Giants and BSE Global stakes |
How much is Julia Koch and family worth in 2026?
Our estimate is $81 billion for the four of them together: Julia Koch and her children David Jr., Mary Julia and John. Koch is private and does not publish profits, so the stake is valued on revenue with a multiple we chose, which makes it the biggest assumption on the page. The sports stakes are smaller but better documented. How the family splits the money among themselves is not public, so we do not divide it.
Adding up 42% of Koch
| Source | Our estimate | What it rests on |
|---|---|---|
| 42% of Koch, Inc. | $78.75 billion | Our assumption: Koch says its annual revenue has exceeded $125 billion. We value the company at 1.5 times that, $187.5 billion, and take 42%. |
| 10% of the Giants | $1 billion | 10% of the roughly $10 billion team value reported when the sale was agreed. The NFL approved it on October 22, 2025; the price was not disclosed. |
| Stake in BSE Global | $900 million | The estimated price of the 15% stake bought in June 2024 in the owner of the Brooklyn Nets, New York Liberty and Barclays Center. |
| Homes and other assets | $200 million | Our assumption: includes a Manhattan townhouse bought for $40.25 million in 2018, plus homes in Southampton and Palm Beach and cash outside Koch. |
| Total | $81 billion | $80.85 billion before rounding. |
A company that keeps its money
Koch reinvests 90% of its earnings, has put more than $190 billion into growth and improvements since 2003, and employs about 130,000 people in more than 50 countries, the company says. Ownership is split three ways: 42% for Charles Koch, 42% for the heirs of David Koch and 16% for trusts of the Marshall family, according to its company history. In 2024 it dropped “Industries” and became Koch, Inc.
Here is the arithmetic we find most telling. By our calculation, the family’s 42% share of that $190 billion reinvestment is $79.8 billion, within about a billion of the $78.75 billion we put on the stake. A company that pays out little and reinvests almost everything turns into a fortune that is mostly retained earnings. The heirs’ wealth is, in effect, two decades of profits that were never paid out.
Two teams in two years
The family bought 15% of BSE Global, owner of the Brooklyn Nets, New York Liberty and Barclays Center, in June 2024 for an estimated $900 million, per Julia Koch’s biography. Then came football. In September 2025 the family agreed to buy 10% of the Giants at a valuation of more than $10 billion, Front Office Sports reported. League owners approved it on October 22, 2025, the National Football Post reported, without a disclosed price. The Mara and Tisch families keep control of the New York club.
By our math the two stakes come to about $1.9 billion, or about 2.3% of our total. Big checks by most standards, rounding errors next to the Koch stake.
From Conway to 740 Park
Julia Flesher grew up in Iowa and Conway, Arkansas, graduated from the University of Central Arkansas and moved to New York in 1984, where she worked for designer Adolfo. She married David Koch in 1996, and the couple moved into a duplex at 740 Park Avenue in 2004; she listed it for sale in 2022. She sits on the Koch board and is president of the David H. Koch Foundation. In 2024 her family foundation gave $75 million to NYU Langone for a medical office tower in West Palm Beach, Florida.
Why other estimates disagree
Koch publishes revenue but not profit, so every public estimate picks its own multiple, and revenue swings with commodity prices. Some also leave out the sports stakes or count the four heirs separately.
What would move the figure
Commodity prices move Koch’s revenue, and any disclosed profit or a sale of part of Koch would replace our multiple with a real price. On the sports side, a sale of either stake, or a new Giants or BSE valuation, would reset those rows.
Julia Koch and family net worth FAQ
What is Julia Koch and family’s net worth?
About $81 billion as of November 2026 by our estimate, for her and her children together. Almost all of it is the family stake in the Wichita company.
How much did the Koch family pay for the New York Giants stake?
The price was not disclosed. The 10% stake was approved on October 22, 2025. Reports valued the team at about $10 billion, which puts the stake near $1 billion.
How much of Koch does Julia Koch own?
The family inherited 42% of the company when David Koch died in August 2019. Charles Koch also owns 42%, and Marshall family trusts hold 16%.
Who are Julia Koch’s children?
David Jr., born in 1998, Mary Julia, born in 2001, and John, born in 2006. Mary Julia works as an associate opinion editor at The Wall Street Journal.
How old is Julia Koch?
64. She was born on April 12, 1962, in Des Moines, Iowa.
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How we estimate net worth
Our estimates are based on public reporting, company valuations, and deal and earnings figures all compiled in an internal valuation model. They are approximate, and figures change over time as new information emerges.
Last updated: November 2026.