KSI

Olajide Olayinka Williams "JJ" Olatunji, known professionally as KSI, is a British influencer, musician, and former professional boxer. He is a co-founder and former member of YouTube group the Sidemen, the co-founder of Misfits Boxing and co-owner of several businesses, including Prime Hydration and Lunchly. KSI has also served as a judge on Britain's Got Talent since 2025. Based in UK, KSI is best known as creator, boxer and prime co-founder, with a combined following of roughly 56M across 4 tracked platforms.

KSI built an audience by posting consistently in the gaming space and turning one format into a habit for fans. Youtube is the biggest home for that audience today at about 24M followers, and growth on the other platforms followed the same content being cut for each feed. Exact milestone dates vary between sources, so treat the timeline here as an outline rather than an official record.

Expect gaming and music content: the recurring formats that made the channel recognisable, collaborations with other creators in the same niche, and short-form cuts made for TikTok, Reels and Shorts. Posting in English keeps the core audience in UK, while subtitles and visual formats pull in viewers worldwide.

Like most creators at this scale, KSI earns through platform revenue, sponsorships and brand partnerships, with merchandise or own-brand products layered on top. Public deal terms are rarely disclosed, so we list only ventures that have been reported publicly and avoid guessing at contract values.

Published net-worth figures for KSI come from third-party estimate sites, not audited accounts, and they disagree with each other by a wide margin. What can be said with confidence is that a following of about 56M supports meaningful income from Youtube alone, before brand work and business ventures. We do not publish a single number we cannot source.