Described by The Philadelphia Inquirer as a “secretive shop of options masters”, the privately-owned trading firm Susquehanna International Group (SIG) was recently singled out for a whopping $15 billion potential payday as the first US backer of the social media app TikTok. At least that was what The Wall Street Journal reckoned was the value of its stake in the Chinese platform. Founded in Philadelphia in 1987, Susquehanna is far from a household name but the flash trader, known for using the game of poker to train up its new recruits, has built up a global presence. It established its…

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