Susquehanna, widely known as SIG, is a global quantitative trading firm founded in 1987. Its origins trace back to a group of college friends who traded independently on the floor of the Philadelphia Stock Exchange before combining their quantitative skills, collaborative approach, and experience with strategic games into a single firm. Today Susquehanna has more than 3,500 employees across more than 16 offices around the world.
The firm is active across essentially all listed financial products and asset classes, with a particular focus on derivatives. Susquehanna operates both as a market maker and a market taker, handling millions of transactions globally each day. Its trading desks are specialised by product and market so that teams can combine quantitative models with detailed knowledge of the mechanics and risks specific to each asset class.
Trading, technology, and quantitative research are deeply integrated across the organisation. Researchers work with large datasets, advanced statistical methods, machine learning, and quantitative modelling to identify signals and improve decision making. Engineers build the systems and infrastructure needed to turn those ideas into production trading strategies, while traders contribute market knowledge, risk judgement, and feedback from live markets.
A distinctive part of Susquehanna's culture is its use of game theory and decision science. The firm's founders brought ideas from poker and other strategic games into the way they thought about probability, expected value, incomplete information, and decision making under uncertainty. That philosophy remains visible in its training programmes and collaborative culture, where games and structured decision exercises are used to sharpen probabilistic reasoning and risk management.
Susquehanna recruits across quantitative trading, technology, quantitative research, and machine learning, with programmes for interns, co-op students, recent graduates, PhDs, postdocs, and experienced professionals. Its global network includes major offices in the Philadelphia area, New York, Chicago, Dublin, London, Sydney, Hong Kong, Singapore, Mumbai, Shanghai, and other financial and technology centres.
