Billionaire Profile
Jan Koum
Global Rank
#144

Image: Public domain | via Wikimedia Commons

Jan Koum

CEO, WhatsApp
US
Real-Time Net Worth
$17.1B
As of December 2025
Age
49
Source
WhatsApp
Industry
technology
Citizenship
US

Biography

Jan Koum, born in Kyiv, Ukraine, is an American billionaire businessman and computer programmer, best known as the co-founder of WhatsApp, a globally recognized messaging service. His estimated net worth is $17.1 billion, a testament to his success. Koum's career began with humble beginnings, moving to the U.S. at age 16 and later working at Yahoo! before launching WhatsApp with Brian Acton. The sale of WhatsApp to Facebook in 2014 for $19.3 billion marked a pivotal moment, propelling Koum to billionaire status. Koum is also involved in philanthropy, supporting various causes including Jewish and Israeli organizations. His journey reflects resilience and a focus on simplicity, contributing to his achievements in the tech industry.

Wealth Over Time

In-Depth Profile

Early Life

Jan Borysovych Koum was born on February 24, 1976, in Kyiv, Ukraine, to a Jewish family. He grew up in Fastiv and immigrated to the United States with his mother and grandmother at age 16, settling in Mountain View, California. His father never joined them and died in 1997. During his early years in the U.S., Koum faced financial challenges, with his mother working as a babysitter while he worked as a cleaner at a grocery store. These experiences shaped his character and instilled a strong work ethic. His mother died in 2000 after a long battle with cancer.

Rise to Success

Koum's interest in computer programming began at age 18. He enrolled at San Jose State University and simultaneously worked at Ernst & Young as a security tester. He dropped out of college to work as an infrastructure engineer at Yahoo! where he met Brian Acton in 1997. Over the next nine years, Koum and Acton worked together at Yahoo!. In 2007, they left Yahoo and traveled around South America. Both applied to Facebook but were rejected.

In January 2009, Koum bought an iPhone and recognized the potential of the App Store. He then discussed with Alex Fishman for an idea for an app. Koum, with Brian Acton, co-founded WhatsApp in February 2009. The app gained traction with its focus on simplicity and reliable messaging, avoiding SMS fees.

Key Business Strategies

WhatsApp's key strategies included a focus on simplicity, speed, and reliability, prioritizing user experience and end-to-end encryption. This approach allowed WhatsApp to gain traction and popularity. This approach, combined with a strong emphasis on user privacy and the avoidance of advertising, differentiated WhatsApp from competitors. The acquisition by Facebook in 2014 for $19 billion in cash and stock was a crucial strategic move. Koum’s focus was always on providing a product that people could rely on. By 2025, the app has 3 billion users.

Philanthropy

Jan Koum has made significant contributions to various causes, including donating $1 million to The FreeBSD Foundation and $556 million to the Silicon Valley Community Foundation (SVCF) in 2014. He also supports Jewish and Israeli causes, donating to organizations like the European Jewish Association and the Federation of Jewish Communities of the CIS. He has also made donations to two universities: Fordham and Stanford. In 2022, he donated $2 million to AIPAC. Koum's foundation endowed a permanent Israel studies program at Stanford University.

Career Milestones

1997

Joined Yahoo!

Began working as an infrastructure engineer at Yahoo!

2009

Founded WhatsApp

Co-founded WhatsApp with Brian Acton, which launched in May 2009.

2014

WhatsApp Acquired by Facebook

WhatsApp was acquired by Facebook for $19 billion.

2018

Left Facebook

Resigned from his role as CEO of WhatsApp and left the Facebook board.

Philanthropy & Social Impact

Technology

The FreeBSD Foundation

$1M

Donation to The FreeBSD Foundation in 2014.

Community Support

Silicon Valley Community Foundation (SVCF)

$556M

Donation to the Silicon Valley Community Foundation in 2014.

Political

AIPAC

$2M

Donation to AIPAC's campaign efforts in 2022.

Education

Stanford University

Undisclosed

Endowed a permanent Israel studies program

Business Philosophy & Leadership

Notable Quotes

"“The F-word here is focus.”"

"“Do one thing, and do it well.”"

"“Experiences from our youth shape what we do later in life.”"

"“Build a sustainable company that's here for the next 100 years.”"

Leadership Principles

Focus

Concentrate efforts on a single product or service to ensure quality and reliability.

Simplicity

Prioritize simplicity in product design and user experience.

User Experience

Emphasize the quality, speed, and reliability of the user experience.

Sustainability

Build a long-term, sustainable business model.

Controversies & Challenges

2018

Departure from Facebook

Left Facebook due to disagreements over user privacy and data monetization strategies.