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The Making of a Market Maker - Colossus

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The front door is a sheet of glass bordered in thick gold. Standing at 8,000 feet outside the $108 million Aspen house that Thomas Peterffy bought with his seasonal roommate, the casino mogul Steve Wynn, you can see the ski slopes across the valley, everything sharp in the thin mountain air. It’s the most expensive residence in Colorado; Peterffy uses it from July to September. I arrived just before nine on a bright, already warm summer morning and pressed the doorbell twice before footsteps approached. “No one ever rings the doorbell,” said the man who led me inside across a cream carpet thick enough to muffle a Gulfstream, past people idling in various rooms, up a dark timber staircase that bent around an elevator shaft, and along a corridor where, a few doors down, I found Peterffy hunched over his Herman Miller chair, adjusting its height. His piercing light-blue eyes looked up in confusion as I was introduced. “I thought we were doing this over Zoom?” he said. My stomach dropped,

The Making of a Market Maker - Colossus Loading Search Podcasts Invest Like the Best Business Breakdowns Founder’s Field Guide Joys of Compounding Founders 50X Magazine Newsletter About Us Sponsors Subscribe Log in Copyright © 2026 Colossus. All rights reserved. Profile The Making of a Market Maker How Thomas Peterffy built the machines that killed the trading floor and made Interactive Brokers into a $100 billion business By Dom Cooke September 2025 Issue 04 PHOTOS BY PRESTON HOFFMAN Click here to subscribe to print for your office or home. The front door is a sheet of glass border

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