Billionaire Profile
Daniel Sundheim
Global Rank
#1533

Image: Public domain | via Wikimedia Commons

Daniel Sundheim

CEO, D1 Capital Partners
US
Real-Time Net Worth
$2.6B
As of December 2025
Age
48
Source
Hedge funds
Industry
finance-investments
Citizenship
US

Biography

Daniel Sundheim, a prominent figure in the hedge fund industry, is the founder and Chief Investment Officer of D1 Capital Partners. With an estimated net worth of $2.6 billion, Sundheim's wealth stems from his expertise in hedge funds and investments. His career began at Bear Stearns before transitioning to Viking Global Investors, where he served as Chief Investment Officer for 15 years. Sundheim is recognized for his strategic investment decisions, particularly in technology and healthcare, and his ability to navigate market volatility. He is also involved in philanthropy, contributing to education and the arts. Sundheim's leadership emphasizes a long-term perspective and adaptability in the dynamic world of finance.

Wealth Over Time

In-Depth Profile

Early Life and Education

Daniel Sundheim was born in either New York or New Jersey in 1977. He graduated from the University of Pennsylvania's Wharton School with a degree in economics in 1999. Prior to his career in finance, Sundheim attended Toms River High School East.

Rise to Success

Sundheim began his career in the Merchant Banking Group at Bear Stearns, working on private equity investments. He then spent 15 years at Viking Global Investors, where he rose to the position of Chief Investment Officer. In 2018, Sundheim founded D1 Capital Partners, a global investment firm that operates across public and private markets. The firm's name, D1, is a reference to Amazon's 'Day One' philosophy.

Key Business Strategies

D1 Capital Partners focuses on investments in the global internet, technology, telecom, media, consumer, healthcare, financial, industrial, and real estate sectors. The firm emphasizes a long-term investment approach with deep research and understanding of the industries it invests in. Sundheim's investment philosophy emphasizes flexibility and adapting strategies to changing market conditions. Sundheim's leadership style is described as collaborative.

Philanthropy

Daniel Sundheim and his wife, Brett, are actively involved in philanthropy, notably in education and the arts. They have supported various exhibitions and contributed to the endowment of the Institute of Contemporary Art (ICA) at the University of Pennsylvania. Daniel Sundheim serves on the boards of trustees at the Museum of Modern Art (MoMA), NYU Langone Medical Center, and Columbia Grammar and Preparatory School.

Career Milestones

2002

Analyst

Began career at Viking Global Investors, covering banks.

2018

Founder

Founded D1 Capital Partners.

2020

Director

Became a director at Instacart.

Philanthropy & Social Impact

Education

University of Pennsylvania

$10M

Sundheim made a significant gift to the University of Pennsylvania, underscoring his dedication to education and social causes.

Business Philosophy & Leadership

Notable Quotes

""The GameStop short squeeze of 2021… if you're D1 Capital Partners founder and chief investment officer Dan Sundheim, you would call it the worst two weeks of your career“"

""We're looking for people who can have strong, insightful ideas while simultaneously being open to the possibility that they're wrong.""

Leadership Principles

Humility

Recognizing that even with past success, each day brings new challenges and the need for adaptability.

Adaptability

Embracing flexibility and adapting investment strategies to changing market conditions.

Controversies & Challenges

2021

GameStop Short Squeeze

D1 Capital Partners lost $4 billion (20% of its capital) due to the GameStop short squeeze.