KSIYouTuber, Boxer, Musician, Co-Founder of Prime

KSI, whose real name is Olajide William Olatunji, is a British YouTuber, boxer, musician, and entrepreneur born on June 19, 1993, in London, England. In 2026, he is 32 years old and one of the most diversified creator brands in YouTube history, with 24M+ subscribers, a professional boxing record, a music discography, and co-ownership of Prime Hydration, one of the most successful creator-founded beverages in the world.

He is a co-founder of the Sidemen and the individual creator most associated with the group's cultural rise in the UK. His career has moved through distinct phases: gaming YouTube, confrontational vlogs, influencer boxing, mainstream music, and entrepreneurship, each building on the previous.

KSI created his YouTube channel in 2009 at age 16, beginning with FIFA content before expanding into vlogs, reaction videos, and the confrontational persona that defined his early growth. His channel became one of the most-subscribed British channels, crossing 10M, 15M, and eventually 24M subscribers across a 16-year run.

His content has evolved substantially over his career. Early FIFA grind content gave way to beef-driven vlogs that capitalized on the attention economy of 2015-2019, followed by boxing build-up content, music releases, and the Prime Hydration era of entrepreneurial content.

KSI co-founded the Sidemen in 2013 alongside W2S, Miniminter, Behzinga, Vikkstar123, Tobjizzle, and Zerkaa. He remains the group's highest-profile individual member and the creator most associated with the Sidemen brand internationally.

The group's collaborative videos, annual charity matches, and the Sidemen Sunday format have generated billions of combined views. The Sidemen Charity Match has become one of the largest live creator events globally, selling out stadiums including Stamford Bridge.

KSI entered the influencer boxing scene in 2018 with a fight against Joe Weller that established the format as a legitimate spectacle in the UK. His two bouts against Logan Paul, culminating in a 2019 professional split decision win in Los Angeles, generated mainstream media coverage and over 40 million combined views, legitimizing influencer boxing as a commercial product.

A 2023 bout against Tommy Fury, a professional boxer and brother of heavyweight champion Tyson Fury, ended in a split decision loss. The fight was KSI's most challenging matchup against a trained professional, and the result was contested by many observers. Despite the loss, the fight drew significant pay-per-view revenue and kept KSI active in the boxing conversation.

In 2022, KSI and Logan Paul, former boxing rivals, launched Prime Hydration, a sports drink brand that rapidly became one of the fastest-growing beverages in the UK and US. Prime achieved over $250 million in retail sales in its first year and secured distribution deals with major retailers including Walmart, Aldi, and Asda.

The brand's success turned what was a creator rivalry into one of the most commercially successful creator-founded companies in history. KSI and Logan Paul's combined audience reach, estimated at over 50 million between the two channels, provided unprecedented marketing scale without traditional advertising spend.

KSI has released multiple music projects that charted in the UK, blending pop, hip-hop, and viral hooks. His track "Patience" featuring Yungblud reached the UK Top 5 in 2021. "Holiday" (2021) and "Pop It" featuring Lil Pump reached the UK charts, establishing him as a commercially viable music act beyond his YouTube status.

His music career adds a revenue layer beyond YouTube, with streaming royalties, concert appearances, and music video views contributing to his overall income. He performs live and has collaborated with both UK grime artists and American rap figures.

KSI's net worth in 2026 is estimated between $50 million and $100 million, with the wide range reflecting uncertainty around the private valuation of his Prime Hydration stake. His income sources include YouTube AdSense on 24M+ subscribers, brand partnerships, boxing event purses, music streaming and performance fees, and the significant equity value of his Prime Hydration co-ownership. Prime's valuation has been cited as exceeding $1 billion.

• YouTube: @KSI (24M+ subscribers)
• Sidemen YouTube: @Sidemen (25M+ subscribers)
• Instagram: @ksi (14M+ followers)
• Twitter/X: @KSI (10M+ followers)

KSI in 2026 represents one of the most remarkable creator career trajectories in YouTube history. Starting as a teenager playing FIFA in London, JJ Olatunji built a 24M-subscriber channel, co-founded the Sidemen, became a professional boxer, charted in the UK music charts, and co-created one of the most successful creator-founded consumer brands in history with Prime Hydration.

For more YouTube creator profiles, see the YouTube Hub, read about W2S and IShowSpeed, or explore the Sidemen Charity Match.