C harles Gibbon is an American investor whose fortune is primarily derived from his early and significant involvement with Susquehanna International Group (SIG), a global quantitative trading and technology firm. SIG is one of the largest and most successful proprietary trading firms in the world, known for its expertise in options trading and its data-driven, analytical approach to markets.

While SIG was founded by a group of friends, including Jeff Yass, Gibbon was a key early figure who helped build and shape the company. He has been a senior member of the firm for decades, contributing to its investment strategy and operations. Like the other partners at the famously private firm, he has accumulated immense wealth from its highly profitable trading activities. His role has been integral to the long-term success of this quantitative trading powerhouse.