Steven Bartlett made his money primarily through entrepreneurship and investments. He founded Social Chain, a social media marketing agency, which he grew into a business valued at around £300 million by his late twenties, making him a millionaire at age 23. After stepping down from Social Chain, he transitioned into investing through his companies Flight Group and Flight Fund, backing over 40 startups including those in biotech, blockchain, and technology. He is also co-founder of Thirdweb, a web3 development platform. Bartlett generates significant revenue from his popular podcast, "The Diary of a CEO," which brings in about £20 million annually, mainly from advertising. He also earns from book sales and lucrative speaking engagements. Additionally, his investments in startups like PerfectTed, a matcha brand, and others contribute to his wealth, with stakes in companies growing substantially in value. Overall, Bartlett's money comes from a combination of building and selling companies, smart investments, media ventures, and personal branding activities.