5 min read
Carlos Slim's net worth was $123 billion, per the Bloomberg Billionaires Index as of 26 September 2026, ranking him 16th globally and the richest person in Latin America. Seven months earlier, Forbes' "World's Billionaires List 2026," published 10 March 2026 with wealth priced as of 1 March 2026, had him at $125 billion, also 16th globally. The two publishers, pricing him nearly seven months apart, land within $2 billion, about 1.6%, of each other, a tighter gap than this series usually finds between two trackers on the same person.
Bloomberg's index put Slim at $123 billion on 26 September 2026, up $335 million, or 0.3%, on the day, and up $9.80 billion, or 8.8%, since the start of the year. Forbes' annual list, using stock prices and exchange rates from 1 March 2026, priced Carlos Slim Helú and his family at $125 billion, Mexico's richest by a wide margin among the 24 Mexicans who made that list. This run found no more current standalone Forbes dollar figure with its own clear date to replace the March list price, so the two figures below are stated with their own dates rather than blended into one.
| Date | Publisher | Figure | Context |
|---|---|---|---|
| 1 March 2026 (list pricing date) | Forbes, "World's Billionaires List 2026" | $125 billion | 16th globally, Mexico's richest |
| 26 September 2026 | Bloomberg Billionaires Index | $123 billion | 16th globally, richest in Latin America |
Bloomberg names a majority shareholding in América Móvil, Latin America's largest mobile carrier, as Slim's single most valuable holding, followed by stakes in holding company Grupo Carso and in Grupo Financiero Inbursa, the banking and insurance group he built separately from Carso. All three trade as separate public companies: América Móvil on the NYSE (AMX) and the Mexican Bolsa (AMXL), Grupo Carso and Grupo Financiero Inbursa both on the Bolsa (GCARSOA1 and GFINBURO). None of the three is present in NetWort's curated ticker universe (frontend/scripts/curated-tickers.mjs, backend/app/services/asset_symbol_service.py), checked this run, so they are named here without a link.
Grupo Carso, through its subsidiary Zamajal, agreed on 19 January 2026 to pay $600 million, $270 million for the remaining stake plus $330 million in assumed debt, for full ownership of Fieldwood Mexico, the operator of the Ichalkil and Pokoch offshore oil fields, as Russian firm Lukoil exited Mexico under U.S. sanctions (BNamericas, Upstream Online, World Oil, all 19 January 2026). Grupo Carso already held the other half of those fields, whose recoverable reserves are estimated at 564 million barrels of oil equivalent, so the deal converts a joint holding into full control and deepens Carso's push into oil and gas alongside its telecom, retail and industrial businesses. Separately, América Móvil reported fourth-quarter 2025 net profit of 19.13 billion pesos, about $1.1 billion, more than 300% higher than a year earlier, helped chiefly by financing costs roughly half of the prior year's, on revenue of 244.9 billion pesos, about $14.2 billion (Reuters, mid-February 2026). No source found this run ties either event directly to the size of the September Bloomberg figure or the March Forbes figure.
Compared with several fortunes this series has covered, Slim's is unusually verifiable: three separately listed companies, each priced daily, rather than one private conglomerate with no public share price. That transparency likely explains why Forbes and Bloomberg land so close together despite pricing him nearly seven months apart, unlike Masayoshi Son's SoftBank-driven swings or Jacqueline Mars's wide, uncorroborated private-company range. The remaining opacity sits at the edges: the Lukoil-related oil fields now held through a private Grupo Carso subsidiary carry no public share price of their own, and much of the underlying business earns pesos while the tracked fortune is reported in dollars, so currency moves alone can shift the number without any change in the listed companies' own share prices.
A fortune split across several separately listed, family-controlled companies can still be tracked with real precision, closer to how a diversified public portfolio behaves than a single-stock founder's stake or a wholly private family firm. For related mechanisms elsewhere in this series, see:
NetWort's market page tracks how publicly traded companies move day to day, the same kind of daily, verifiable pricing behind most of Slim's tracked fortune.