· stephen mandel , jr. This wealth primarily stems from his successful career in hedge fund management through lone pine capital. · as of december 2024, stephen mandel jr. ’s net worth is estimated at approximately $2. 5 billion. Stephen mandel earned his fortune as the founder of the hedge fund lone pine capital. Stephen mandel is an american hedge found manager who has a net worth of $2. 5 billion. Stephen frank mandel jr. [1] according to forbes, mandel has an estimated net worth of us$3. 9 billion as of august 2022. Is #1462 on forbes 2025 billionaires list. It was estimated at $2. 5 billion in 2024, likely due to his accelerated political and charitable giving. Is an american hedge fund manager, investor, and philanthropist. · the 66-year-old mandel, who has an estimated net worth of $3. 9 billion , according to forbes, founded lone pine capital in 1996 and reportedly has turned in one of the best long-term track records. He founded lone pine capital in 1997, following his tenure as managing director at tiger. Mandle stepped away from active management of lone pine in 2019 and in 2021 his net worth reached a high of $3. 9 billion; He founded lone pine capital in 1997, after working as the managing director at tiger management.