Slim vs Peterffy

América Móvil and Interactive Brokers.

The differences

Forbes puts Carlos Slim Helú about $13.3B ahead of Thomas Peterffy.Forbes figures from 17 Oct 2026 and 5 Sep 2026.
Both started the company their money comes from.
Carlos Slim Helú is about 4 years older than Thomas Peterffy.
Carlos Slim Helú is from Mexico; Thomas Peterffy is from United States.
Carlos Slim Helú has held a public or government advisory role; Thomas Peterffy has none on record.

Put someone else on either side

Slim

Peterffy

Net worth, Forbes: $120BForbes, 17 Oct 2026; $107BForbes, 5 Sep 2026
Net worth, Bloomberg: $118BBloomberg, 10 Oct 2026; $104BBloomberg, 11 Oct 2026
Forbes rank: No. 15Real-Time list, 20 Sep 2026; No. 20Real-Time list, 5 Sep 2026
Billionaire since: 1991First year on a Forbes billionaires list: Forbes says he 'first appeared on Forbes' Billionaires list in 1991 at $1.7 billion', mainly on his Grupo Carso stake; Not stated

How it started: Founded itBegan building Grupo Carso in 1965 at 25; Inmobiliaria Carso was incorporated in January 1966. He bought into Telmex at its 1990 privatisation; América Móvil was spun off from Telmex in 2000; Founded itFormed the business now known as Interactive Brokers in 1977 after buying an American Stock Exchange seat
Main source: Stakes in América Móvil, Grupo Carso and Grupo Financiero InbursaBloomberg: his most valuable asset is a majority shareholding in America Movil, followed by Grupo Carso and Inbursa; Interactive Brokers stock, held through IBG HoldingsBloomberg: 'The majority of Thomas Peterffy's fortune is derived from Interactive Brokers Group'
Companies: América Móvil, Grupo CarsoAmérica Móvil: Honorary and life chairman; Grupo Carso: Honorary lifetime chairman; Interactive BrokersInteractive Brokers: Founder and chairman
Biggest stake: Grupo Carso76% owned; Interactive Brokers67.5% owned

Born: 28 Jan 1940Mexico City, Mexico; 1944Budapest, Hungary
Country: MexicoLives in Mexico City, Mexico; United StatesLives in Palm Beach, Florida, United States
Education: Bachelor's degreeCivil engineering degree, National Autonomous University of Mexico (UNAM), 1961; Left university without a degreeAttended the College of Surveying in Hungary; studied at New York University without finishing
Parents: Father Julián Slim Haddad, a Lebanese immigrant, owned the dry-goods store La Estrella de Oriente and property in central Mexico City; mother Linda Helú; Descended from Hungarian aristocrats who lost nearly everything under Soviet rule; arrived in the US in 1965 at 21 with no moneyForbes profile; parents' occupations not stated

Giving Pledge: Not a signer; Not a signer
Foundation: Fundación Carlos SlimFounded 1986; he also chairs Fundación Telmex; Peterffy FoundationEstablished by Peterffy and run by his children; funds the Living Forest Project, Reweaving the Web and One Small Planet
Lifetime giving: $4.2BForbes, 26 Mar 2019. Dated Forbes estimate: donations to the Carlos Slim Foundation since 2006, per his spokesman; Not stated

Role now: Chair of the boardHonorary lifetime chairman of Grupo Carso; chairman of IDEAL and of his foundations; Chair of the boardFounder and chairman of Interactive Brokers
Successor: His sons have taken over: Carlos Slim Domit chairs América Móvil and Grupo Carso; Patrick Slim Domit is co-chairman of América Móvil and was CEO of Grupo Carso; Marco Antonio Slim Domit is a Grupo Carso director; Milan Galik succeeded him as CEO in 2019His son William Peterffy, CEO of One Small Planet, is an Interactive Brokers director
Public office: Member, UN high-level advisory group on energy and climate change; Co-leader, Mexico City Historic Centre citizens' advisory councilYear not stated; 2001-present; None found
Legal record: 2001: Texas state district court (Dallas); reversed by the Texas Court of Appeals in 2004After a jury verdict for COC Services in a dispute over a CompUSA franchise deal, the trial judge ordered him personally to pay $85.5 million; in 2004 the Court of Appeals reversed the judgment against him and his companies and ruled that COC take nothing from them.; 1980: American Stock ExchangeSettled an exchange disciplinary matter over exceeding options position limits (Rule 904) with a $500 fine, per his FINRA BrokerCheck report.