John Mars
- Net worth $49 billion
- Birthday October 15, 1935
- Status -
- Country United States
- Source(-s) of wealth Businessman
How much is John Mars Worth? John Mars Net Worth in 2026
John Mars’s net worth is estimated at $49 billion as of November 2026. He owns about a third of Mars, the private company behind Snickers, Pringles and Pedigree. When Mars bought Kellanova for about $36 billion, about three of every four dollars of the price was matched by new borrowing, and Mars also took over Kellanova’s own notes. His third of that debt is the one thing standing between his stake and a much bigger number.
| Net worth | $49 billion (our estimate, range $40 billion to $60 billion) |
|---|---|
| Born | October 15, 1935, Arlington, Virginia |
| Age | 91 |
| Country | United States |
| Known for | Son of Forrest Mars Sr.; long-time chairman of Mars, Inc. |
| Main income sources | About one third of Mars, Inc. |
How much is John Mars worth in 2026?
Our estimate is $49 billion. Mars has never sold a share to outsiders, so there is no market price for his stake. What exists is a recent purchase price for a similar business, the Kellanova deal, and a published sales figure for Mars itself. We combine the two, subtract the debt Mars raised for the deal and take a third. It is an estimate with a wide range, and it would change if Mars ever disclosed profits.
The math behind $49 billion
| Source | Our estimate | What it rests on |
|---|---|---|
| One third of Mars, valued at the Kellanova price | $59.8 billion | Our calculation: Mars paid $35.9 billion including debt for Kellanova, a business with more than $13 billion in 2023 sales, about 2.76 times sales. The same multiple on combined sales above $65 billion values Mars at about $179 billion before debt. One third is $59.8 billion. |
| One third of the Kellanova debt | minus $10.7 billion | $26 billion of bonds, a $1 billion private placement and $5.1 billion of Kellanova notes Mars took on add up to $32.1 billion. A third is $10.7 billion. Other borrowing is not public, so this row may run low. |
| Assets outside Mars | $300 million | Our assumption for his home in Jackson, Wyoming, art and cash. None of it has a public price. |
| Total | $49 billion | $49.4 billion before rounding. |
Mostly paid with debt
Mars closed the Kellanova purchase on December 11, 2025, after the European Commission cleared it on December 8, Vending Market Watch reported. The deal was worth about $36 billion. Nine months earlier Mars had sold $26 billion of bonds and a $1 billion private placement and lined up consents on $5.1 billion of Kellanova notes, according to its law firm.
By our calculation the $27 billion of new bonds and notes covers about 75% of the $35.9 billion price, and with the $5.1 billion of Kellanova notes Mars took over, deal debt reaches $32.1 billion, about 89%. His third of the purchase is about $12 billion, of which about $10.7 billion is debt. For a family that has avoided outside shareholders for 115 years, that is a lot of other people’s money.
What the deal says Mars is worth
Kellanova went for $35.9 billion including debt, the 2024 deal announcement said, on 2023 sales of more than $13 billion: about 2.76 times sales. Combined Mars and Kellanova sales were above $65 billion in 2025, a company anniversary report said, with about 170,000 employees. Put the same multiple on the whole company and Mars is worth about $179 billion before debt. That is our calculation, and it is generous if Mars’s pet hospitals and candy bars earn less per dollar of sales than Pringles. We use it because it is the one arm’s-length price Mars itself paid.
He and his sister Jacqueline each own about a third, according to published ownership estimates, with most of the rest held by the four daughters of their brother Forrest Jr.
A chairman who stayed private
Born in Arlington, Virginia, he went to the Hotchkiss School and Yale and is listed as chairman of Mars in his biography. In January 2017 Mars agreed to pay $7.7 billion for VCA, the animal hospital chain. He received an honorary knighthood from Queen Elizabeth II in 2015 and now lives in Jackson, Wyoming.
Why other estimates disagree
Public estimates differ mainly on how much Mars earns, which nobody outside the company knows, and on whether they subtract the Kellanova debt. Older figures predate the deal entirely.
What would move the figure
Paying down the $32.1 billion of Kellanova deal debt would add up to $10.7 billion to his share without a single extra candy bar sold. A disclosed profit figure, or any family share sale, would replace our sales multiple with a firmer number.
John Mars net worth FAQ
What is John Mars’s net worth?
About $49 billion as of November 2026 by our estimate, nearly all from his roughly one third of Mars, Inc. Our range is $40 billion to $60 billion.
How much did the Kellanova deal cost John Mars?
None of it came from him directly. Mars paid about $35.9 billion, and by our math his third of the $32.1 billion of debt raised or assumed for it is about $10.7 billion.
How much of Mars does John Mars own?
About a third, the same as his sister Jacqueline, according to ownership estimates. Mars does not publish its share register.
How big is Mars, Inc.?
Mars and Kellanova had combined 2025 net sales above $65 billion and about 170,000 employees across more than 3,600 sites.
How old is John Mars?
91. He was born on October 15, 1935, in Arlington, Virginia.
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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.