At issue is the structure of the US stock market, which has seen a surge in trading by everyday investors.The US stock markets top watchdog has questions about the underpinnings of the retail trading boom. One of those concerns is whether a small number of trading firms and brokerages have too much ...

https://qz.com/2006073/sec-chair-gensler-is-wary-of-citadel-securities-market-power/

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