• The fortunes of wealthy family dynasties in the US have been increasing, according to a new report by the Institute for Policy Studies.
  • The report looked at the 15 wealthiest family dynasties from the Forbes 400 list and found they have a combined wealth of $618 billion.
  • Since 1982, the combined wealth of the top three families has increased by 5,868%, totaling $348.7 billion.

Income inequality in America is getting worse, and dynastic wealth, which has been bemoaned by Warren Buffett, may be one of the reasons why.

The left-leaning Institute for Policy Studies’ “Billionaire Bonanza” report examined the growing concentration of wealth in the US by looking at 15 dynastically wealthy families from the Forbes 400 list and data from the Federal Reserve’s Survey of Consumer Finance.

“Each of these family’s wealth comes from companies started by an earlier generation, either a parent or more distant ancestor,” the report said. “Each of them also represents a wealth dynasty passing generation to generation free from interruption.”

Read more: How the billionaire Koch brothers became 2 of the most influential political donors in America

It found that the median American family owns just more than $80,000 in household wealth, while the 15 family dynasties own a combined $618 billion.

Since 1982, the combined wealth of the top three families - the Waltons, the Kochs, and the Marses - increased by 5,868%, totaling $348.7 billion.

Here's a closer look at how they and the rest of the wealthy dynastic families from the Forbes 400 built their wealth, ranked from lowest net worth to highest net worth. The estimated total wealth for each family is a sum of each individual family member's wealth listed on the Forbes 400 and does not include the wealth of any family members not on the Forbes 400.

Note that the Forbes 400 doesn't encompass all of America's wealthy dynastic families - some individual family members have less than the $2.1 billion in personal wealth needed to make the list.


15. The Cathy family is worth $11 billion thanks to its fried-chicken fortune.

Foto: Dan Cathy.sourceGustavo Caballero/Getty Images for Pinewood Studios Group

Source: The Billionaire Bonanza Report


The family's wealth comes from fast-food chain Chick-fil-A, founded in 1967 by Samuel Truett Cathy.

Foto: Samuel Truett Cathy.sourceCourtesy of Chick-fil-A

Source: Forbes


His sons, Bubba and Dan, share the family's wealth, with a fortune of $5.5 billion each.

Foto: sourceMike Stewart/Associated Press

Source: The Billionaire Bonanza Report


14. The Stryker family built its $11.1 billion fortune with Stryker Corp., a medical-equipment company founded by Homer Stryker.

Foto: Jon Stryker.sourceTaylor Hill/Getty Images

Source: The Billionaire Bonanza Report


His grandchildren — siblings Pat, Jon, and Ronda — each inherited a stake in the company, which generated $12 billion in sales in 2017. Ronda is the only sibling to serve on the board.

Foto: Ronda and Jon Stryker.sourceBennett Raglin/Getty Images

Source: Forbes


All three are philanthropists and have donated at least $855 million collectively to various causes and foundations.

Foto: Jon Stryker.sourceNoam Galai/Getty Images

Source: Forbes, Forbes, Forbes


13. The Goldman family owns a good chunk of New York City real estate with Solil Management, which has built them a fortune of $13.2 billion.

Foto: New York City skyline.sourceoneinchpunch/Shutterstock

Source: The Billionaire Bonanza Report, Business Insider


Sol Goldman began the real-estate firm in the 1950s by buying foreclosed properties at bargain prices. Today, it has a 17% stake in the World Trade Center developments.

Foto: One World Trade Center in downtown Manhattan.sourceSirinyim/Shutterstock

Source: Business Insider


His daughter Jane Goldman runs the company, which has assets worth an estimated $12 billion. She owns 25% of the company with her siblings.

Foto: sourceKatie Warren/Business Insider

Source: Business Insider


12. The Bass family has a net worth of $13.3 billion thanks to an oil fortune.

Foto: Sid Bass with his wife, Mercedes Bass.sourcePatrick McMullan/Getty Images

Source: The Billionaire Bonanza Report


In 1959, the oil tycoon Sid Richardson left his nephews Robert, Sid, Lee, and Edward $2.8 million each. They then diversified the money.

Foto: Sid Bass.sourceDavid Woo/Getty Images

Source: Forbes


The four brothers received $5.6 billion in stock after selling their oil company to ExxonMobil in 2017. They could reap payouts worth up to $1 billion.

Foto: sourceEric Glenn/Shutterstock

Source: Forbes


11. The Ziffs have a fortune worth $14.4 billion that began with the magazine publisher Ziff Davis Inc., which published PC Magazine.

Foto: Dirk Ziff (right).sourceGetty/Scott Olson

Source: The Billionaire Bonanza Report


William Ziff Jr. sold the magazine publisher for $1.4 billion in 1994. His sons, Daniel, Robert, and Dirk, grow their inheritance through Ziff Brothers Investments.

Foto: Dirk Ziff with his wife, Natasha.sourcePatrick McMullan/Getty Images

Source: Business Insider


They reportedly own several homes in Aspen, Colorado, have put their money toward philanthropic efforts, and invest their billions with managers who used to work at their hedge funds.

Foto: Daniel Ziff with his wife, Leslie.sourcePatrick McMullan/Getty Images

Source: Business Insider


10. The S.C. Johnson family has a fortune of $18.2 billion.

Foto: Herbert Fisk Johnson III.sourceTheo Wargo/Getty Images

Source: The Billionaire Bonanza Report


S.C. Johnson, which produces cleaning products such as Pledge, Glade, and Windex, was founded by its namesake in 1882 and eventually taken over by his son, Herbert Fisk Johnson.

Foto: sourceKelly Tippett/Shutterstock

Source: Business Insider


Herbert Fisk Johnson died in 1928 without a will, and the family reportedly feuded over the inheritance until it was eventually divided between his two children, Herbert Fisk Johnson Jr. and Henrietta Johnson Louis.

Foto: Herbert Fisk Johnson III.sourceJim Spellman/Getty Images

Source: Business Insider


9. Like the S.C. Johnson family, the Lauder family has a fortune built on retail. They're worth $22.4 billion.

Foto: sourceDimitrios Kambouris/Getty Images

Source: The Billionaire Bonanza Report


In 1947, Estée Lauder received her first major order, which was for $800 of skincare products from Saks Fifth Avenue.

Foto: sourceRay Fisher/Getty Images

Source: Business Insider


Today, the company has 30 brands of makeup, including MAC and Clinique, and reported $13.8 billion in net sales in 2018.

Foto: sourceFrancis Dean/Getty Images

Source: Business Insider, The Estee Lauder Companies


The Lauders are active philanthropists — Leonard Lauder donated $1 billion worth of art to the Met — and own a lot of real estate.

Foto: Aerin and Jane Lauder.sourceJamie McCarthy/Getty Images

Source: Business Insider


8. The Duncan family has a net worth of $24.8 billion.

Foto: Dan L. Duncan's daughter, Randa Williams, right, with her husband and mother-in-law.sourceBob Levey/Getty Images

Source: The Billionaire Bonanza Report


Dan L. Duncan founded Enterprise Products Partners, a natural-gas and crude-oil company, in 1968 with just $10,000.

Foto: Enterprise not pictured.sourceRed ivory/Shutterstock

Source: Business Insider


After he died in 2010, the company remained under family control, and his four children inherited a $10 billion estate. The family fortune has since more than doubled.

Foto: Randa Williams.sourceDan L. Duncan's daughter, Randa Williams (left), with husband and mother-in-law.

Source: Business Insider


7. The Pritzker family has a fortune of $26.6 billion with roots in hospitality.

Foto: Anthony Pritzker with his wife and kids.sourceJohn Heller/Getty Images

Source: The Billionaire Bonanza Report


A.N. Pritzker and his sons, Jay, Donald, and Robert, created the family's wealth by founding the Hyatt Hotel chain and investing in holdings, such as Marmon Group.

Foto: sourceKAREN BLEIER/Getty Images

Source: Business Insider


Eleven members of the family are billionaires — eight are on the Forbes 400 list.

Foto: Penny Pritzker.sourcePool/Getty Images

Source: Business Insider, The Billionaire Bonanza Report


They reportedly spent much of the 2000s arguing over trusts, ultimately dividing up the fortune.

Foto: J.B. Pritzker.sourcePaul Natkin/Getty Images

Source: Business Insider


6. The Cox family has a fortune worth $37.2 billion thanks to Cox Enterprises.

Foto: James Cox Kennedy.sourceAP Photos

Source: The Billionaire Bonanza Report


The company spans a number of industries — cable and broadband (Cox Communications), newspapers and radio stations (Cox Media Group), and automotive — and generates about $20 billion in revenue.

Foto: sourceWikimedia Commons

Source: Business Insider


Founder James Cox's five grandchildren share the family fortune.

Foto: Katharine Raynor, daughter of Anne Cox Chambers, with her husband, Billy Raynor.sourceKrista Kennell/Getty Images

Source: Business Insider


5. The Edward C. Johnson family is worth $38.7 billion.

Foto: Abigail Johnson.sourceBrian Snyder/Reuters

Source: The Billionaire Bonanza Report


Edward C. Johnson founded the world's second-largest mutual-fund company, Fidelity, in 1946. It has been run by three Johnson generations since.

Foto: sourceJames Leynse/Getty Images

Source: Business Insider


The family owns 49% of the company, which is helmed by Edward C. Johnson's granddaughter, Abigail Johnson.

Foto: Abigail Johnson.sourceBoston Globe/Getty Images

Source: Business Insider


4. The Cargill-MacMillan family's wealth of $38.8 billion dates back to 1865, when agribusiness giant Cargill Inc. was founded.

Foto: Martha MacMillan.sourceJemal Countess/Getty Images

Source: The Billionaire Bonanza Report, Business Insider


Today, 23 members of the Cargill-MacMillan family own 88% of the company, which generates $108 billion in annual revenue.

Foto: sourceSylvain Gaboury/Getty Images

Source: Business Insider


Of this clan, 14 are billionaires — nine are on the Forbes 400.

Foto: Martha MacMillan.sourceSylvain Gaboury/Getty Images

Source: The Billionaire Bonanza Report, Business Insider


3. The Mars family has a fortune of $72 billion from its candy empire, Mars Inc., which invented M&Ms, Milky Ways, and Mars Bars.

Foto: Jacqueline Mars and her granddaughters.sourcePool/Getty Images

Source: The Billionaire Bonanza Report


Six of the family members rank among the Forbes 400. Siblings Jacqueline and John Mars have the biggest share of the fortune, with $24 billion each; the other four members have $6 billion each.

Foto: Jacqueline Mars.sourceRon Sachs - Pool via Getty Images

Source: The Billionaire Bonanza Report


They run the Mars Foundation, which donates to educational, environmental, cultural, and health-related causes.

Foto: Jacqueline Mars.sourceLeigh Vogel/Getty

Source: Business Insider


Jacqueline Mars' son, Stephen Badger, is the chairman of Mars Inc., which brings in more than $35 billion in annual revenue.

Foto: Stephen Badger.sourceHollis Johnson/Business Insider

Source: Business Insider


2. Koch Industries has helped the Koch family build a fortune of $107 billion.

Foto: David and Julia Koch.sourceJamie McCarthy/Getty Images

Source: The Billionaire Bonanza Report


Brothers Charles and David Koch expanded their father's oil-refinery firm into the conglomerate, which generates roughly $100 billion in revenue annually.

Foto: sourceMSNBC/Youtube

Source: Business Insider


David has pledged to contribute more than $1.2 billion to cancer research, hospitals, education, and cultural institutions through the David H. Koch Charitable Foundation.

Foto: David Koch.sourceAP Photo/FIle

Source: Business Insider


Both brothers reportedly secretly funded some of the biggest summer movies of 2017, including "Wonder Woman."

Foto: Charles Koch.sourcePatrick T. Fallon for The Washington Post via Getty Images

Source: Business Insider


1. The Walton family is the biggest family-wealth dynasty in the US, worth $169.7 billion.

Foto: Siblings Jim, Alice, and Rob Walton.sourceRick Wilking/Reuters

Source: The Billionaire Bonanza Report


Their source of wealth comes from Walmart, which Sam and Bud Walton founded in 1962 before founding Sam's Club in 1983.

Foto: sourceBob Chamberlin/Getty Images

Source: Business Insider


Today, Walmart reports $500 billion in sales, making it the largest retailer by revenue in the world.

Foto: sourceJeff Greenberg / Contributor / Getty Images

Source: Business Insider


The Walton family fortune is dispersed among seven family members, including cofounder Sam Walton's three children, Rob, Jim, and Alice.

Foto: Rob, Alice, and Jim Walton.sourceRick T. Wilking/Getty Images

Source: Business Insider


Alice Walton is the richest woman in the world, with a $44.9 billion fortune.

Foto: Alice Walton.sourceD Dipasupil/Getty Images

Source: Business Insider, The Billionaire Bonanza Report