John Mars and Mars Inc.
John Mars owns about a third of Mars, Inc., like his sister Jacqueline 26.
Full nameJohn Franklyn Mars
NationalityUnited States
Known forCo-owner of Mars, Inc.
Mars, Incorporated
Mars is a privately owned maker of confectionery, food and pet care products. Forbes estimates that John and Jacqueline Mars each own about a third, and Forrest Jr.'s four daughters hold most of the rest 26.
Control
Forrest Mars Sr. turned control over to his three children after retiring, and he died in 1999 3.
Frequently asked questions
About a third, according to Forbes' estimate.
The heirs of Forrest Mars Sr.: John, Jacqueline and the daughters of the late Forrest Jr.
Sources✓ Verified 14 Nov 2026
1 Powerbase, Jacqueline Mars, 20 Oct 2026, Ownership
2 First Class, Mars third richest family net worth, 1 Jan 1970, Private company
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