Jan Koum has never dated Kendall Jenner. No publication that reports on the model’s private life has ever placed the two together, and there is no record of them so much as meeting. The supposed link between the WhatsApp co-founder and one of the most photographed women alive has nothing behind it.
The more interesting question is how his name ended up next to hers at all. Koum is one of the most private billionaires in technology, a man who built a fortune on a single app and then spent years making himself difficult to find. He is close to the last person you would expect to read about in a celebrity gossip column.
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Are Jan Koum and Kendall Jenner dating?
No. Here is what the record shows instead.
E! Online keeps a running account of every man Kendall Jenner has been romantically linked to. It runs through Harry Styles, Blake Griffin, Ben Simmons, Devin Booker, Bad Bunny, and most recently the actor Jacob Elordi. Koum’s name has never appeared on it, in that account or any comparable one from People or Page Six.
Their paths do not cross in the public record, even at the kind of event where a rumor like this might start. In the summer of 2024, Koum hosted a private party for celebrity guests on the Croatian island of Lopud. Jenner spent that stretch elsewhere, photographed in Ibiza and later in the south of France, more than a thousand miles away.
No journalist ever reported the relationship as fact. There is no named source behind the claim and no confirmed sighting of the two together. It simply repeats from one place to the next, with no reporting underneath.
Who is Jan Koum?
His story begins in Soviet Ukraine.
Jan Koum was born in Kyiv on February 24, 1976, and grew up in the town of Fastiv in a house with no hot water. His parents kept their phone calls short and guarded, on the assumption that the government was listening. That detail matters later.
In 1992, at sixteen, he moved to Mountain View, California, with his mother and grandmother. A social support program got them a small apartment. His mother cleaned houses and babysat, and he swept the floors at a grocery store. His father stayed behind in Ukraine and died in 1997. His mother died of cancer in 2000.
He taught himself to code from manuals he bought secondhand. In 1997 he joined Yahoo as an infrastructure engineer, working alongside Brian Acton, whom he had met not long before. The two stayed at Yahoo until 2007, left to travel around South America for a year, then both applied to Facebook. Both were turned down.
In early 2009 Koum bought an iPhone and saw where Apple’s new App Store was heading. He built a messaging app, named it WhatsApp because it sounded like “what’s up,” and incorporated the company on his 33rd birthday. It barely registered at first. The app took off after Apple added push notifications that June. It spread fastest among people who were tired of paying for international texts, and by early 2014 it had more than 400 million users.
On February 9, 2014, Mark Zuckerberg invited Koum to dinner and offered to buy the company. Facebook announced the deal ten days later at a headline price of $19 billion. By the time it closed that October, with Facebook’s stock climbing, the final value had reached roughly $22 billion, the biggest acquisition of a venture-backed startup at the time. Koum signed the paperwork outside the Mountain View social services office where he had once collected food stamps, a detail his co-founder noted publicly afterward.
He left Facebook in April 2018 after falling out with the company over user privacy and how it planned to make money from WhatsApp. He had built the app so that messages could not be mined and sold. When that promise looked shaky, he walked.
How much is Jan Koum worth, and how does he live?
Forbes and other trackers put his net worth at around $17 billion in 2026. He invests now through a low-profile firm called Newlands, which holds close to 10 million shares of Meta.
His spending sits on another scale, and almost none of it is public:
- A compound in Atherton, California, assembled by buying five neighboring lots. One building on it is a two-story garage made to hold his collection of more than 100 Porsches.
- A property in Malibu with a funicular railway that runs down the cliff to the beach.
- A chรขteau on the French Riviera, bought in late 2023 for about 65 million euros.
- A fleet of superyachts, including a 331-foot vessel named Moonrise, delivered in 2025 and built to run almost silently.
He travels with bodyguards and keeps almost no public profile. He rarely gives interviews. His giving runs into the hundreds of millions, and in May 2026 his foundation pledged $200 million to a hospital in Jerusalem, the largest single gift an Israeli medical institution has received.
He has said he never did it for the money, and once joked that he would have his bodyguard punch the next person who called him an entrepreneur. Whether or not you take him at his word, twenty years of staying out of sight back it up.
Who is Jan Koum’s girlfriend?
For all the speculation, Koum has been publicly linked to exactly one person, the Ukrainian model Evelina Mambetova, going back to 2014. The two kept the relationship well out of the public eye and never confirmed anything close to marriage. Forbes currently lists his status as single. Nothing connects him to Kendall Jenner, or to any other public figure.
Who is Kendall Jenner dating now?
Jenner is the opposite kind of famous. Born November 3, 1995, she has been on television since she was eleven, when her family’s reality show began. She is one of the best-paid models in the world, the founder of 818 Tequila, a co-owner of the retail platform FWRD, and she has more than 270 million Instagram followers.
She guards her own love life closely, which is part of why her name gets attached to people at random. She told Harper’s Bazaar in 2017 that she sees no reason to make a relationship public unless she is all the way in. In 2026 she has been linked to Jacob Elordi after the two were seen together at Coachella. A source told People they had been “hanging out and getting to know each other,” while adding that nothing serious had been settled.
The irony Jan Koum could not have planned for
Koum built a tool around one idea. What you say in private should stay private, and should never become someone else’s product. Three billion people use WhatsApp because of it. He gave up a board seat at one of the biggest companies on earth to keep that idea intact.
His name is now the product. It has been pinned to Kendall Jenner, a woman he has no documented connection to, and handed to anyone who goes looking for it. The thing he spent two decades guarding against reached him from the one direction he never thought to cover.
