Citadel Securities is under the microscope over its relationship with Robinhood. But the high-frequency trading firm is not laying low.
Credit: Patrick T. Fallon/Bloomberg/Adam Jeffery/CNBC/ NBCUniversal/Getty Images
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High-speed trading firm linked to Robinhood is going to war with the SEC
Citadel Securities is under the microscope over its relationship with Robinhood. But the high-frequency trading firm is not laying low.
