Kenji Kasahara’s net worth over time
Only dates with a published estimate are shown. Nothing is filled in between. Tap or hover a bar to see the source.
See the numbers as a table
| Date | Estimate | Source |
| 2015 | $1.4 billion | Forbes World's Billionaires List 2015 |
| 2016 | $1 billion | Forbes World's Billionaires List 2016 |
| 2017 | $1.5 billion | Forbes World's Billionaires List 2017 |
| 2018 | $1.6 billion | Forbes World's Billionaires List 2018 |
| 2021 | $1.1 billion | Forbes World's Billionaires List 2021 |
| 2025 | $1.1 billion | Forbes World's Billionaires List 2025 |
| Oct 2026 | $1.2 billion | Forbes Real-Time Billionaires · Forbes real-time estimate |
Where the money comes from
These are the main sources of wealth named in the reporting we cite. No published source breaks the total into exact amounts, so we do not show percentages.
Kenji Kasahara’s fortune in real-life terms
Based on the Forbes Real-Time Billionaires estimate above. Median full-time U.S. pay is $65,416 a year ($1,258 a week, BLS, Q2 2026), before taxes. Typical (median) U.S. family net worth is $216,100 (Federal Reserve, 2025 Survey of Consumer Finances).
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Kenji Kasahara has an estimated net worth of $1.2 billion, according to Forbes Real-Time Billionaires, Kenji Kasahara profile (figures as of October 20, 2026). That is down from a peak of $1.6 billion.
Kenji Kasahara is a Japanese entrepreneur who founded Mixi, once Japan's best-known social networking site, and still serves as the company's chairman. He was born on December 6, 1975, in Minoh, Osaka Prefecture, and Forbes describes him as self-made.
He started young. In 1997, at age 21, he created a job information website called Find Job!, and two years later he founded eMercury Inc. to run it. That early start in online services gave him the experience to launch a much bigger idea a few years later.
In 2015 he also launched FamilyAlbum, a private photo-sharing app that lets families share pictures of their children. He is one of the best-known figures of Japan's first wave of internet startups.
How Kenji Kasahara made his money
Kasahara launched Mixi in 2004, and it quickly became the leading social network in Japan. The company went public in 2006, making his stake worth a fortune while he was still in his early thirties. By 2008 he was among the richest people in Japan.
Then the business ran into trouble. By 2013 Mixi was losing users and investors as global rivals raced ahead. Kasahara stepped down as CEO but stayed on as chairman, and the company changed course.
Mixi refocused on mobile gaming, e-commerce, dating and apartment hunting. Its big hit was Monster Strike, a mobile game that has been downloaded tens of millions of times. The game turned Mixi from a fading social network into a profitable entertainment company, and it rescued much of Kasahara's fortune.
Kasahara's story is a lesson in reinvention. Few founders whose first big product loses its audience manage to stay rich, but Mixi's move into games gave the company a second life. He stayed involved through the change, and the turnaround kept him on the Forbes list years after Mixi's peak as a social network.
How Forbes has valued Kenji Kasahara
Forbes valued Kasahara at $1.4 billion in 2015. His figure dipped to $1 billion in 2016, then rose to $1.5 billion in 2017 and $1.6 billion in 2018.
He was back on the list at $1.1 billion in 2021 and again in 2025. As of October 20, 2026, the Forbes real-time billionaires tracker showed $1.2 billion. His fortune is tied to Mixi's share price, which depends heavily on how its games perform.
Career and money timeline
- 1975
Born in Minoh, Osaka Prefecture, Japan.
- 1997
Created the job site Find Job!.
- 2004
Launched the social network Mixi.
- 2006
Mixi went public.
- 2013
Stepped down as CEO and stayed on as chairman.
- 2015
Launched the FamilyAlbum app.
Kenji Kasahara net worth FAQ
What is Kenji Kasahara's net worth?
Kenji Kasahara's net worth is an estimated $1.2 billion, according to Forbes Real-Time Billionaires, Kenji Kasahara profile (October 20, 2026). It is an estimate, not an official figure.
How did Kenji Kasahara get so rich?
The main sources named in the reporting we cite are: social network.
Is Kenji Kasahara a billionaire?
Yes. Forbes Real-Time Billionaires estimates Kenji Kasahara is worth $1.2 billion.
How has Kenji Kasahara's net worth changed?
The earliest published estimate we track is $1.4 billion (2015, Forbes World's Billionaires List 2015). The latest is $1.2 billion (October 20, 2026).
What game made Mixi profitable again?
Monster Strike, a mobile game that has been downloaded tens of millions of times.
Sources
- Forbes Real-Time Billionaires, Kenji Kasahara profile (October 20, 2026)
- Forbes World's Billionaires List 2015, Kenji Kasahara profile (March 2, 2015)
- Forbes World's Billionaires List 2016, Kenji Kasahara profile (March 2016)
- Forbes World's Billionaires List 2017, Kenji Kasahara profile (March 20, 2017)
- Forbes World's Billionaires List 2018, Kenji Kasahara profile (March 6, 2018)
- Forbes World's Billionaires List 2021, Kenji Kasahara profile (April 6, 2021)
- Forbes World's Billionaires List 2025, Kenji Kasahara profile (April 2025)
- U.S. Bureau of Labor Statistics, Usual Weekly Earnings (Q2 2026) (July 2026)
- Federal Reserve, 2025 Survey of Consumer Finances (median family net worth, Table 4) (October 2026)
- Background facts: Wikipedia, Kenji Kasahara (accessed October 31, 2026). Used for career facts only, never for figures.
Every number on this page is an estimate published by the source named next to it. We never fill in years with our own guesses. How we handle estimates.