Koch vs Bloomberg

Koch, Inc. and Bloomberg L.P..

The differences

Forbes puts Michael Bloomberg about $10.3B ahead of Julia Koch.Forbes figures from 9 Oct 2026 and 22 Sep 2026.
Julia Koch: through marriage. Michael Bloomberg: founded it.
Michael Bloomberg is about 21 years older than Julia Koch.
Michael Bloomberg has signed the Giving Pledge; Julia Koch has not.
Michael Bloomberg has held a public or government advisory role; Julia Koch has none on record.

Put someone else on either side

Koch

Bloomberg

Net worth, Forbes: $84.6BForbes, 22 Sep 2026; $94.9BForbes, 9 Oct 2026
Net worth, Bloomberg: $78.5BBloomberg, 10 Oct 2026; Not stated
Forbes rank: No. 24Real-Time list, 22 Sep 2026; No. 20Real-Time list, 9 Oct 2026
Billionaire since: 2020Forbes named her the richest newcomer on its 2020 World's Billionaires list, at $38.2 billion, after David Koch died in 2019; Not stated

How it started: Through marriageShe and her three children inherited the 42% Koch stake of her husband David Koch, who died in 2019; they married in 1996; Founded itFounded Bloomberg L.P. in 1981 after leaving Salomon Brothers; Forbes says he put in the seed funding
Main source: The family's inherited stake in Koch, Inc.Koch says it has diversified from energy into consumer, technology, communications, healthcare and real estate; Bloomberg L.P.
Companies: Koch, Inc.Koch, Inc.: Board member; Bloomberg L.P.Bloomberg L.P.: Founder and majority owner
Biggest stake: Koch, Inc.42% owned; Bloomberg L.P.88% owned

Born: 1963Iowa, United States; 14 Feb 1942Boston, Massachusetts, United States
Country: United StatesLives in New York City, United States; United StatesLives in New York City, United States
Education: Bachelor's degreeBachelor's degree, University of Central Arkansas; Graduate degreeBS in electrical engineering, Johns Hopkins University; MBA, Harvard Business School (1966)
Parents: Her family ran Flesher's, a used-furniture shop in Indianola, Iowa, where her father Frederic worked; Grew up in a middle-class home in Medford, Massachusetts; worked in a parking lot and took government loans to pay for Johns HopkinsParents' occupations not stated

Giving Pledge: Not a signer; Signed in 2010
Foundation: Julia Koch Family FoundationFounded in 2023 with her children; she is also president of the David H. Koch Foundation; Bloomberg PhilanthropiesCovers his foundation, corporate and personal giving
Lifetime giving: $1.3BJulia Koch Family Foundation, 17 Oct 2026. 'More than $1.3 billion' given by David and Julia Koch together, through the David H. Koch Charitable Foundation and personal giving; a joint figure, not hers alone. Date is when the page was read; $25.4BForbes, 31 Dec 2025. Forbes' estimate of lifetime giving through the end of 2025, counting only money given to charitable recipients

Role now: On the boardDirector of Koch, Inc.; chair of the Julia Koch Family Foundation and president of the David H. Koch Foundation; OwnerFounder and majority owner of Bloomberg L.P.; founder of Bloomberg Philanthropies; UN Special Envoy on Climate Ambition and Solutions
Successor: No member of her family is named in a Koch executive role in the cited sources; Charles Koch is chairman and co-CEO with Dave RobertsonChase Koch is an executive vice president of Koch; Vlad Kliatchko, CEO since 2023 and chairNo ownership successor or family executive named in the cited sources
Public office: None found; Mayor of New York City; UN Special Envoy on Cities and Climate Change; UN Special Envoy for Climate Action, later Special Envoy on Climate Ambition and Solutions; WHO Global Ambassador for Noncommunicable Diseases and Injuries2002-2013; 2014; 2018-present; 2016-present
Legal record: None found; None found