KSI, the Sidemen star and online personality, has amassed a staggering net worth of approximately £80 million, according to celebritynetworth.com. The 32-year-old, whose real name is Olajide Olayinka Williams Olatunji, has built his fortune through YouTube, music, boxing, and his viral drink brand Prime, co-created with Logan Paul.
KSI's music career has seen him nominated for two Brit Awards, including a 2025 nod for Song of the Year with his hit 'Thick Of It'. He has collaborated with artists such as Tom Grennan and Anne-Marie, and performed at events like Hits Radio Live and Capital's Summertime Ball. His boxing career includes a high-profile 2023 match against Tommy Fury.
Despite his public success, KSI keeps his personal life private. He has a long-term girlfriend whom he met on Tinder, and who works for the NHS in a 'nine to five' job. In a podcast, he explained that she 'doesn't want to be famous' and that he values the separation between his public life and their private relationship.
The name KSI stands for Knowledge, Strength, Integrity, originating from his early days in a Halo gaming clan. Alongside the Sidemen, he is recognised as one of the UK's richest gamers, with the group's YouTube channel continuing to thrive and even featuring in a Netflix documentary.
