How Jan built the fortune
Jan Koum's fortune rests on a single product. In 2009 he and his former Yahoo colleague Brian Acton started WhatsApp, an app that at first only showed a status next to a contact's name. It soon became a way to send messages over a data connection instead of paying for text messages, which mattered a great deal to people in countries where carrier fees were high and to anyone writing across borders.
The company stayed small in headcount while its user base grew into the hundreds of millions. Koum insisted on a simple product with no advertising and on privacy features, later including end to end encryption. In February 2014 Facebook agreed to acquire WhatsApp in a cash and stock deal valued at about 19 billion dollars, one of the largest technology acquisitions of its time. As the largest individual shareholder, Koum received a substantial block of Facebook stock.
He joined Facebook's board after the deal and continued to run WhatsApp inside the larger group. Much of his wealth today reflects the value of the Facebook, now Meta, shares he received, along with sales and diversification since then.
Part of what made WhatsApp unusual was its business model. For several years the app charged a small annual fee in some markets rather than selling advertising, and the founders kept a sign on Koum's desk reminding staff of their opposition to ads. That stance became a point of tension later, when the service was part of a company whose revenue came mostly from advertising.
Companies and holdings
Koum is not known for running other operating companies. His assets are understood to consist mainly of:
- Shares in Meta Platforms received in the WhatsApp sale, some of which he has sold over time
- Cash and diversified investments built from those sales
- Real estate in California
He left Facebook's board and his role at WhatsApp in 2018, after reported disagreements over data use and advertising plans for the service.
Securities filings over the years have shown regular sales of Meta stock by entities linked to him, which is consistent with a long term programme of diversification rather than a single exit.
He has also invested privately in a small number of start ups, but none of these has become a public company of comparable scale, and his name is rarely attached to new ventures. The WhatsApp service he built now belongs to Meta and is used by billions of people, but his financial link to it runs only through the parent company's shares.
Early life and career
Koum was born in 1976 in Kyiv, then part of the Soviet Union, and grew up in a small town outside the city. In 1992, at about sixteen, he moved with his mother to Mountain View, California. The family had limited means, and he has spoken about relying on food stamps and working as a cleaner in a grocery store during his teenage years.
He taught himself computer networking, enrolled at San Jose State University and worked as a security tester before joining Yahoo in 1997 as an infrastructure engineer. He spent about nine years there, where he met Acton. After leaving Yahoo in 2007 he took time off, and in 2009 he bought an early iPhone and saw the opening that led to WhatsApp.
The early WhatsApp team worked out of modest offices in Mountain View, and Koum kept the engineering group very small even as the service crossed several hundred million users. He has said that his experience growing up in a society where conversations could be monitored shaped his commitment to private messaging.
Philanthropy and public life
Koum has given large sums through donor advised funds and his own family foundation, and in 2016 he made a major contribution to the Silicon Valley Community Foundation. His giving has supported causes ranging from education to Jewish and Ukrainian organisations, although he rarely publicises individual gifts.
Since leaving Facebook he has kept a quiet public profile. He gives few interviews and has not taken an executive role at another large company.
He has also donated to organisations supporting refugees and emigrants from the former Soviet Union, reflecting his own family's path to the United States.