More than a century before today’s billionaire rankings, Forbes was already tracking America’s biggest fortunes. In 1918, founder B.C. Forbes surveyed leading bankers to identify the country’s 30 richest people. John D. Rockefeller topped the list with a $1.2 billion fortune; and was its only billionaire. The 30 richest Americans were collectively worth nearly $3.7 billion at the time. By comparison, the 30 richest Americans on Forbes’ 2026 list are worth $4.4 trillion, or 50 times more after adjusting for inflation. Here are the five fortunes that led Forbes’ first rich list. 📸: Forbes; Harvard Business School; Encyclopedia Britannica: Illustration by Mostafa Said via OpenAI ChatGPT