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The fragility of the US economy had nearly destroyed him. It wasn't enough that Citadel's walls were as strong and impenetrable as the name implied; the economy itself needed to be just as solid.
Over the next decade, he endeavored to place Citadel at the center of the equity markets, using his company's superiority in math and technology to tie trading to information flow. Citadel Securities, the trading and market-making division of his company, which he'd founded back in 2003, grew by leaps and bounds as he took advantage of his 'algorithmic'-driven abilities to read 'ahead of the market.' Because he could predict where trades were heading faster and better than anyone else, he could outcompete larger banks for trading volume, offering better rates while still capturing immense profits on the spreads between buys and sells. In 2005, the SEC had passed regulations that forced brokers to seek out middlemen like Citadel who could provide the most savings to their customers; in part because of this move by the SEC, Ken's outfit was able to grow into the most effective, and thus dominant, middleman for trading — and especially for retail traders, who were proliferating in tune to the numerous online brokerages sprouting up in the decade after 2008.
Citadel Securities reached scale before the bigger banks even knew what had hit them; and once Citadel was at scale, it became impossible for anyone else to compete. Citadel's efficiency, and its ability to make billions off the minute spreads between bids and asks — multiplied by millions upon millions of trades — made companies like Robinhood, with its zero fees, possible. Citadel could profit by being the most efficient and cheapest market maker on the Street. Robinhood could profit by offering zero fees to its users. And the retail traders, on their couches and in their kitchens and in their dorm rooms, profited because they could now trade stocks with the same tools as their Wall Street counterparts.
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Ben Mezrich (The Antisocial Network: The GameStop Short Squeeze and the Ragtag Group of Amateur Traders That Brought Wall Street to Its Knees)