Ken Griffin's Citadel is cashing in on the day-trading boom by buying customers' orders

7:08am PDT - June 22nd, 2020    david price - Business Insider

• Ken Griffin's Citadel Securities is cashing in on the day-trading boom, the Financial Times reported on Monday.
• The market maker handles 40% of shares traded by individual investors in the US, the newspaper said.
• Citadel has benefit…