Arthur Dantchik

Arthur Dantchik co-founded Susquehanna International Group in 1987 in Bala Cynwyd, Pennsylvania with Jeff Yass and others. SIG grew to become one of the largest market makers and proprietary trading firms in the world, with operations spanning US and global equity options, futures, and other derivatives. SIG is known for its quantitative approach to options market making and for its unique training culture that emphasizes probabilistic thinking through poker, game theory, and decision-making under uncertainty. The firm produces many of its own traders and has a reputation for intellectual rigor in its approach to risk and probability. SIG has also become a significant early-stage technology investor, with notable positions including an early investment in TikTok parent ByteDance. The firm is deliberately private about its operations and financial results.