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Billionaire Profile
William Chisholm
Global Rank
#1351

Image: Photo by Ryder. Engraving by Samuel Sartain | Public domain | via Wikimedia Commons

William Chisholm

CEO, Private equity
Atherton, California
Real-Time Net Worth
$3.18B
Estimated based on Private equity stock value as of September 10, 2026
0% (24h)
Age
57
Source
Private equity
Industry
Finance & Investments
Citizenship
United States

Biography

William Chisholm is a prominent figure in the private equity sector, recognized for his role as the managing partner and chief investment officer of STG Partners. His career, spanning decades in Silicon Valley, includes co-founding Symphony Technology Group (STG), a firm specializing in technology investments. With a current estimated net worth of $3.2 billion, Chisholm's source of wealth is primarily private equity. He is also known for leading an investor group that purchased the Boston Celtics NBA team for $6.1 billion. Chisholm's career demonstrates a consistent focus on strategic investments and operational improvements within the tech industry.

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Data Updated
Sep 10, 2026
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Wealth Over Time

Net Worth History

YearNet Worth
2026$3.18B
2025$3.20B
2024$3.20B

Portfolio Holdings

Boston Celtics

Boston Celtics

sports
$3.11B
Holdings Value
Ownership
51%
Boston, Massachusetts
512 employees
Founded 1946

In-Depth Profile

Early Life

William F. Chisholm Jr. grew up in Georgetown, Massachusetts. He attended Brooks School, where he excelled in academics and athletics, playing basketball, lacrosse, and soccer. He led the soccer team to its first Class A New England Prep championship and won The Boston Globe's All-Scholastic award for soccer. He graduated from Brooks in 1987. He furthered his education at Dartmouth College, where he played soccer and was a member of the Alpha Chi Alpha fraternity, graduating in 1991. He earned a Master of Business Administration (MBA) from the Wharton School at the University of Pennsylvania in 1996.

Rise to Success

After graduating from Dartmouth, Chisholm began his career as an analyst at PaineWebber in New York. He later served as the chief financial officer of International Sports Publishing and worked as a management consultant at Bain & Company. In 2000, he joined Symphony Technology Group (Symphony), a venture capital firm, as a partner. In 2002, he co-founded Symphony Technology Group (STG) alongside technology entrepreneur Romesh Wadhwani. STG, based in Menlo Park, California, focuses on investments in enterprise software, cloud computing, and cybersecurity. Chisholm became the firm's managing partner and chief investment officer, taking full leadership in 2017. Under his leadership, STG has become a significant player in private equity, managing approximately $12 billion in assets as of March 2025.

Key Business Strategies

Chisholm's primary business strategy revolves around identifying and investing in promising technology companies. STG focuses on acquiring underperforming or undervalued tech firms, helping them to scale through operational improvements and strategic integration. He takes a hands-on approach to the day-to-day management of STG companies, acting as a sounding board on a variety of issues. He has led many STG investments, including the acquisition and combination of McAfee Enterprise and FireEye to create Trellix.

Philanthropy

Chisholm, along with his wife Kimberly, are significantly involved with Breakthrough T1D, a research and advocacy organization for Type 1 diabetes.

Career Milestones

2002

Cofounder of Symphony Technology Group (STG)

Co-founded Symphony Technology Group, a private equity firm specializing in tech investments.

2017

Managing Partner and Chief Investment Officer, STG

Took over as managing partner and chief investment officer of STG Partners.

2025

Agreed to purchase Boston Celtics

Led an investor group to purchase the Boston Celtics NBA team for $6.1 billion.

Philanthropy & Social Impact

Health

Breakthrough T1D

$X

Supports research and advocacy for Type 1 diabetes.

Business Philosophy & Leadership

Notable Quotes

"I'm all about winning championships and raising banners."

Leadership Principles

Strategic Investment

Focusing on identifying and investing in promising technology companies.

Operational Improvement

Improving operational efficiencies and strategic integration within acquired companies.

Billionaires Connected to William Chisholm

Peers in Finance & Investments

All Finance & Investments billionaires

Richest in United States

All billionaires from United States

Adjacent Global Ranks

Full global ranking

Frequently Asked Questions

What is William Chisholm's net worth in 2026?
As of 2026, William Chisholm's estimated net worth is $3.179 billion, ranking #1351 among the world's billionaires. The estimate is based on publicly available shareholding data and market prices, updated daily.
How did William Chisholm make their money?
William Chisholm's wealth primarily comes from Private equity, most notably through Private equity.
Where is William Chisholm from?
William Chisholm is from United States.
How old is William Chisholm?
William Chisholm is 57 years old.

Sources & References

  1. William Chisholm — Forbes profile Forbes