Most of the fortunes in this series are young. The Waltons built theirs in one lifetime, the Kennedys across three. The du Ponts have been rich in America for more than two hundred years, since a chemist who trained under Antoine Lavoisier fled the French Revolution and started making gunpowder on a creek in Delaware in 1802. That makes them the closest thing the United States has to old-world dynastic wealth, and it makes them the best case study in what happens to a fortune when it gets truly old. The answer is not what you would guess. The money did not stay a single pile that one heir controls. It became a set of institutions, trusts and a trust company and a web of foundations, and it dispersed across so many descendants that one of them, an eighth-generation du Pont, is a professional skier living off the grid in a geodesic dome in Idaho. This post reads how a two-century-old fortune actually pays out, from the filings.
Gunpowder to nylon
Éleuthère Irénée du Pont de Nemours arrived in the United States on the first day of the nineteenth century, January 1, 1800, having fled Revolutionary France (Library of Congress). He had trained in France under the great chemist Antoine Lavoisier at the royal gunpowder administration, learning to refine saltpeter and manufacture powder, and he saw that American gunpowder was poor (Science History Institute). In 1802 he bought a site on Brandywine Creek near Wilmington for $6,740 and built a powder works he named Eleutherian Mills (Hagley Museum). From black powder the company grew into dynamite and smokeless powder and then, in the twentieth century, into the chemistry that made it a household name: nylon, first synthesized by Wallace Carothers' team in 1935 and in commercial production at Seaford, Delaware by 1939, and Teflon, discovered by Roy Plunkett in 1938 (Wikipedia, "Nylon"; Science History Institute).
The moment that kept it a family business came in 1902. When the company president Eugene du Pont died, three cousins, all great-grandsons of the founder, bought the firm to keep it in the family: Thomas Coleman du Pont, who became president, along with Alfred I. du Pont and Pierre S. du Pont (Wikipedia, "Pierre S. du Pont"). They modernized it into an explosives giant that by 1881 controlled about 85 percent of the American market, drawing an antitrust suit that forced it to spin off the Hercules and Atlas powder companies before the First World War, in which DuPont supplied roughly 40 percent of the Allies' explosives (Encyclopedia.com). By then the du Ponts were, in the plain words of one reference history, "one of the wealthiest families in the nation" (Encyclopedia.com).
The fortune turned into gardens
The most visible thing the du Ponts did with the money was build estates in the Brandywine Valley, and the striking part is that the family gave most of them to the public. Pierre S. du Pont bought a property in 1906 to save its historic trees from a lumber company and turned it into Longwood Gardens, now more than 1,100 acres of public horticulture (Longwood Gardens). His cousin Henry Francis du Pont filled his childhood home with the finest collection of American decorative arts in the world, nearly 90,000 objects made between 1630 and 1860, and opened it in 1951 as the Winterthur Museum, set in a 60-acre garden (Winterthur). Alfred I. du Pont built Nemours, a 77-room mansion completed in 1910 with 200 acres of French formal gardens modeled on Versailles, now open to the public (Nemours Estate). And the original 1802 powder works, together with the ancestral family home that housed five generations, is now the 235-acre Hagley Museum and Library, a Smithsonian Affiliate that keeps DuPont's business archives (Hagley Museum). The first thing to understand about how the du Pont fortune endures is that a great deal of it stopped being private wealth and became institutions with gates open to anyone.
The four structures that still pay
The wealth that stayed in the family did not stay as a checkbook. It was routed into four durable structures, and reading them is the whole lesson.
The first was a trust company. Thomas Coleman du Pont founded Wilmington Trust in 1903 to manage the growing family fortune, and for a century it was the bank and trustee for the du Pont branches, until it was acquired by M&T Bank in a deal announced in 2010 and valued at about $351 million, which the press treated as the end of the du Pont banking legacy (Wikipedia, "Wilmington Trust"; M&T Bank). The second was a holding company. Christiana Securities, formed in 1915, held a concentrated block of DuPont stock, effective control of roughly 28 percent of the company, so the family could vote as one; it was folded back into DuPont in October 1977, distributing those shares directly to individual du Ponts (Britannica; SEC). A trust company to administer the wealth and a holding company to keep the corporate control together: the same two tools the Waltons use today, running in Delaware a century earlier.
The third structure is the one that still writes checks, and it is remarkable. When Alfred I. du Pont died in 1935, his roughly $40 million estate, which included seven Florida National Banks and large tracts of the Florida Panhandle, passed into a testamentary trust (Wikipedia, "Alfred I. duPont Testamentary Trust"). His brother-in-law Edward Ball ran that trust from 1935 until 1981 and used it to build the St. Joe Paper Company into one of Florida's largest private landowners, holding more than a million acres at its peak (Wikipedia, "St. Joe Company"). Ninety years after Alfred's death, that trust is still compounding and still doing the job his will assigned it, caring for sick children. Its beneficiary is the Nemours Foundation, and by the foundation's own account the trust's portfolio was worth almost $10 billion as of December 2023, money that funds the Nemours Children's Health hospital system (Nemours). A gunpowder heir's 1935 will still pays for children's hospital care today, out of Florida land and bank stock, through a trust that has outlived everyone who set it up.
The fourth structure is a web of branch foundations, one for nearly every line of the family, and their tax returns show the scale. The Longwood Foundation holds about $1.02 billion, the Nemours Foundation that runs the hospitals reports $3.43 billion in assets, and smaller branch funds follow: the Crystal Trust from Irénée du Pont's line at about $272 million, the Welfare Foundation at about $107 million, the Chichester duPont Foundation at about $48 million, and the Marmot Foundation at about $21 million (ProPublica, Longwood; ProPublica, Nemours; ProPublica, Crystal Trust). The branch-by-branch split is the point: the fortune did not stay one thing, it fanned out into a dozen institutions that pour DuPont-derived money back into Delaware and beyond.
The honest picture, and the dome in Idaho
So what does an individual du Pont actually have today? Much less, individually, than the mythology suggests, because the fortune is dispersed rather than concentrated. Forbes does not list any single du Pont as a standout billionaire. It lists the family collectively, at $22 billion, ranked nineteenth on its 2026 list of America's richest families, up from $14.3 billion in 2016, a moving aggregate spread across stakes in the successor chemical companies (Forbes). And it is spread thin: the family numbered more than 3,500 living relatives as of 2016, now in its ninth American generation (Wikipedia, "Du Pont family"). The billion-dollar trusts and foundations are institutionally owned; they fund a children's hospital and public gardens, not personal checks to thousands of heirs.
Nothing illustrates that dispersal better than where some of the ninth generation has ended up. A branch of the family has lived for decades not in Delaware's Chateau Country but in Ketchum, Idaho, in the Sun Valley resort area. Chris duPont, a member of the dynasty, moved west specifically, as a local paper put it, "to get away from the duPont family name," bought a pair of cowboy boots and a big belt buckle, and opened a bar called the Crazy Horse; he married Holley duPont, an Idaho Falls native and Sun Valley skier (Idaho Mountain Express). Their daughter Lexi duPont is a professional big-mountain freeskier, born in Sun Valley in 1989, and both Wikipedia and Forbes document her as an eighth-generation descendant of Éleuthère Irénée du Pont, the man who built the powder mill. Forbes found her living off the grid in a roughly 500-square-foot geodesic dome in Sun Valley (Wikipedia, "Lexi duPont"; Forbes). The company itself has a small modern footprint in the state too, a DuPont insulation plant that opened in Burley, Idaho in 2018 (DuPont), but the real Idaho story is the family one: two centuries after the gunpowder, an heir to the name skis for a living and lives in a dome, having moved across the country to shed the name entirely.
That is the whole shape of a fortune that got old. It did not vanish, and it did not stay a single dynastic pile that one person controls. It turned into structures, a trust company, a holding company, a perpetual charitable trust, and a web of foundations, that outlived every heir who built them and still fund a hospital and a valley of public gardens. And the family turned into 3,500 people, most of them ordinary, one of them in a dome in Idaho. Old money, it turns out, survives precisely by ceasing to be personal, by becoming institutions that pay out on a founder's instructions long after the founder, and most of the fortune's romance, is gone.
Related reading
- Two Quiet Dynasties: the Crown and Kroenke families and the private holding companies that hold diversified wealth.
- How the Waltons Keep Half a Trillion Dollars: the same trust-and-holding-company playbook at its largest and youngest.
- What the Rothschilds Actually Did With Money: another old dynasty whose fortune dispersed across branches rather than staying one pile.
- The Working Ledgers: the market underneath every fortune that lasts.
Fact-check notes and sources
- The family and the company (E.I. du Pont arriving in the United States on January 1, 1800 after fleeing Revolutionary France; his training under Antoine Lavoisier; the 1802 purchase of the Brandywine site for $6,740 and the founding of Eleutherian Mills; the growth into dynamite and then chemicals, with nylon synthesized in 1935 and in commercial production by 1939 and Teflon discovered in 1938; the 1902 rescue by cousins T. Coleman, Alfred I., and Pierre S. du Pont; the roughly 85 percent explosives market share by 1881, the antitrust spin-off of Hercules and Atlas, and the roughly 40 percent of Allied explosives in World War I; and the family's status as one of the nation's wealthiest): Library of Congress, Science History Institute on E.I. du Pont, Hagley Museum, Wikipedia, "Nylon", Science History Institute on Plunkett, Wikipedia, "Pierre S. du Pont", and Encyclopedia.com. The widely repeated figure of roughly 1,500 du Pont descendants by mid-century could not be sourced to any authoritative document and is deliberately not used here; the firmly documented figure is more than 3,500 living relatives as of 2016.
- The estates (Longwood Gardens from Pierre S. du Pont's 1906 purchase, now more than 1,100 acres; Winterthur, Henry Francis du Pont's collection of nearly 90,000 American decorative-arts objects made from 1630 to 1860, opened in 1951 with a 60-acre garden; Nemours, Alfred I. du Pont's 77-room mansion completed in 1910 with 200 acres of Versailles-inspired gardens; and Hagley Museum and Library on the 235-acre original powder-works site): Longwood Gardens, Winterthur, Nemours Estate, and Hagley Museum. Nemours is 200 acres today, not the larger historical figure sometimes cited.
- The four structures (Wilmington Trust founded by T. Coleman du Pont in 1903 as the family trust company and acquired by M&T Bank in a 2010 deal valued at about $351 million; Christiana Securities formed in 1915 holding effective control of roughly 28 percent of DuPont and merged back into DuPont in October 1977; the Alfred I. du Pont Testamentary Trust created at his 1935 death from a roughly $40 million estate, run by Edward Ball from 1935 to 1981, which built the St. Joe Company to more than a million acres and whose portfolio was worth almost $10 billion as of December 2023, still funding Nemours Children's Health; and the branch foundations with the cited asset figures): Wikipedia, "Wilmington Trust", M&T Bank, Britannica, SEC, Wikipedia, "Alfred I. duPont Testamentary Trust", Wikipedia, "St. Joe Company", Nemours, ProPublica, Longwood Foundation, ProPublica, Nemours Foundation, and ProPublica, Crystal Trust. The dollar value of the 1977 Christiana merger is not stated here because it could not be firmly sourced.
- The dispersed fortune and the Idaho branch (Forbes listing the du Pont family collectively at $22 billion and nineteenth among America's richest families in 2026, up from $14.3 billion in 2016, with no single standout du Pont billionaire; more than 3,500 living relatives in the ninth generation; Chris and Holley duPont in Ketchum and the Crazy Horse bar; Lexi duPont as an eighth-generation descendant, a professional freeskier living in a geodesic dome in Sun Valley; and the DuPont insulation plant opened in Burley, Idaho in 2018): Forbes on the du Pont family, Wikipedia, "Du Pont family", Idaho Mountain Express, Wikipedia, "Lexi duPont", Forbes on Lexi duPont, and DuPont.
This post is informational and historical, not financial advice. All figures are reproduced from the cited filings and public record, with unverified figures deliberately omitted and flagged. Individuals are discussed as nominative fair use from the public record, with no affiliation implied.
