Every net worth figure on this site is an estimate, not a measurement. Nobody outside a person’s own accountants knows what they are worth. This page explains how our estimates are built, how much confidence they deserve, and where they break down — so you can judge the numbers for yourself.
What a net worth figure on this site means
A figure here is the sum of the holdings we can observe, valued at the most recent price we have, minus the liabilities that have been publicly reported. It is a lower bound dressed up as a number. Assets nobody has disclosed do not appear in it, because we do not guess at them.
Where the numbers come from
- Public company stakes. Share counts from regulatory disclosures, multiplied by the latest share price we hold for that listing. This is the most reliable component and usually the largest.
- Private company stakes. Valued from the most recent reported funding round or transaction. These figures age badly — a valuation set in a different market can be far from what the stake would fetch today.
- Historical series. Year-by-year figures shown on profile charts come from previously published estimates and are kept as a record of how an estimate has moved, not as restated present-day values.
What we cannot see
These are real limits, not disclaimers. Privately held real estate, art, trusts and family holding structures are largely invisible to us. Debt secured against shares is rarely disclosed and can be very large. Wealth held through nominees or in jurisdictions without public registries does not surface at all. For people whose wealth sits mostly outside listed equities, our estimate may be wrong by a wide margin, and we would rather say so than imply a precision we do not have.
How AI is used, and where it stops
Profile and company summaries on this site are drafted with the help of large language models working from the structured data described above. That is disclosed on every page that has not yet been through human review, and those pages carry an “AI-assisted draft” marker rather than a fact-checked badge.
Language models are not permitted to invent figures. Where a fact is missing, the field is left empty and the page simply omits it. A page that shows no employee count is a page where we do not know the employee count. See our editorial standards for the full policy.
Which pages we allow into search results
A page is only submitted to search engines once it clears a content-quality gate applied uniformly across the site. A billionaire profile must carry at least 250 words of original prose, a net worth figure supported by a historical series, and at least 2 further documented sections — career history, philanthropy, legal record, education or citations. A company profile must carry an original description of at least 120 words, two verified facts about the business, and a link to someone we track.
Pages that fall short stay reachable on the site but are marked noindex and excluded from our sitemap until they are rewritten. We would rather publish a smaller index we can defend than a large one we cannot.
Update cadence
Share prices and the valuations derived from them refresh automatically. Biographical detail, career history and company descriptions change only when the underlying facts do. Each page shows the date its data was last updated, and, where an editor has reviewed it, the date and name of that review.
Corrections
If a figure here is wrong we want to know. Send the page, the figure, and the source for the correct value through our contact page, and read how we handle and log fixes in our corrections policy.
Nothing on this site is investment advice. Leader Portfolio is an independent publication and is not affiliated with Forbes Media LLC, Bloomberg L.P., or any company profiled here.