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Forbes Europe estimated Stephen Mandel Jr.’s net worth at $5.7 billion as of October 1, 2026. That is a publisher’s real-time estimate—not an audited disclosure or a personal financial statement from Mandel—and Forbes does not explain the calculation in the profile.
What is Stephen Mandel’s net worth?
The latest figure in the located sources is Forbes Europe’s $5.7 billion real-time estimate, dated October 1, 2026. Forbes Europe’s profile page shows an update date of September 15, 2026, but the estimate itself is labeled October 1; those dates refer to different things. The figure should therefore be described as Forbes Europe’s estimate as of October 1, not as a September 15 valuation. Forbes Europe’s Stephen Mandel Jr. profile
Net worth is the value of assets minus liabilities. The profile does not provide a detailed balance sheet or disclose the methodology behind the estimate. No audited personal net-worth figure or detailed breakdown of Mandel’s assets and liabilities is established by the sources cited here, so the $5.7 billion figure should not be treated as an exact, independently verified accounting.
Why Stephen Mandel is associated with hedge-fund wealth
Mandel founded Lone Pine Capital in 1997 after working at Tiger Management from 1990 to 1997, where he held investment and management roles. Lone Pine lists him as the firm’s founder and executive chairman. Lone Pine Capital’s Steve Mandel biography
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Lone Pine says portfolio management fully transitioned to co-chief investment officers in 2019. Mandel’s senior title and the firm’s portfolio-management responsibilities are distinct: these sources do not establish that he continues to personally manage Lone Pine’s portfolios.
Lone Pine describes its approach as fundamental equity investing, emphasizing high-conviction opportunities, deep sector knowledge and bottom-up research. Those firm-level details provide context for Mandel’s career, but they do not reveal the value of his personal holdings.
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Net worth and Lone Pine’s assets under management are different
Lone Pine’s assets under management (AUM) figure is dated June 30, 2026, and its page says the measure includes assets across funds it manages and, for certain private investments, current value and uncalled commitments. AUM describes capital managed by the firm; it is not Mandel’s personal wealth or a measure of what he owns. Lone Pine’s investment approach and AUM details
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How the published estimates compare
| Source and publication context | Amount | Date represented | What the figure means |
|---|---|---|---|
| Forbes Europe profile | $5.7 billion | October 1, 2026 | Real-time net-worth estimate; the profile page shows an update date of September 15, 2026. Forbes Europe |
| Forbes hedge-fund-billionaire list | $2.6 billion | 2017 | Historical list estimate, not a current figure. Forbes’ 2017 list |
The 2017 and 2026 figures are estimates made for different publications and dates, with the 2026 figure identified as real-time. They are not a consistent time series, so subtracting them or using them to calculate a precise annual wealth-growth rate would imply more comparability than the sources establish.
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