Ostium is an onchain perpetuals exchange built on Arbitrum that lets anyone long or short real-world assets - stocks, commodities, indices, forex and crypto - directly from a self-custodial wallet, with up to 200x leverage and no broker in the middle. Founded by Harvard classmates and former Bridgewater hands Kaledora Kiernan-Linn and Marco Antonio Ribeiro, Ostium uses synthetic perpetuals and a custom oracle system to bring traditional markets onchain. It has processed tens of billions in cumulative trading volume and raised $27.8M total, including a $20M Series A co-led by General Catalyst and Jump Crypto in December 2025.
Emil Hakem (also spelled Emil Hakim) is a serial entrepreneur and founder-CEO of Sierra International Network Inc. (SINI), a diversified global investment corporation headquartered in Corona, California, with branches in England, Dubai, and Egypt. Holding a doctorate in Business Administration and over 20 years of entrepreneurial experience, Hakem built JH Group Inc. into a multi-brand consumer powerhouse — with hair care brand Formawell reportedly reaching Kendall Jenner's vanity — before pivoting to Sierra International Network and its signature 'Stock in the Box' program, which lets individuals earn equity in early-stage companies through online engagement. SINI has raised $407.5 million across funding rounds and announced plans for a NASDAQ listing based on an independent $3.41 billion company assessment.
Doomberg is the pseudonymous green-chicken persona behind the most-read finance newsletter on Substack, with 373,000+ subscribers. Run by a tight-knit team of former heavy-industry executives and private-equity professionals, Doomberg delivers lateral-thinking analysis on energy, finance, and geopolitics - unapologetically pro-nuclear, data-driven, and fiercely independent. Launched in May 2021, the publication grew from zero to the #1 finance newsletter on Substack without spending a dollar on marketing, making it one of the most remarkable organic media success stories of the independent publishing era.