Citadel Securities to Buy NYSE Market-Making Unit From IMC (2)

Citadel Securities plans to buy the market-making unit of smaller rival IMC Financial Markets, expanding its presence at the New York Stock Exchange.

The deal would shore up Citadel Securities’ position as the largest floor broker on the exchange, according to a statement. Terms weren’t disclosed.

Citadel Securities, which oversees daily trading in more than 1,500 NYSE-listed securities, is among the designated market makers responsible for ensuring that trading runs smoothly from the floor of the exchange.

Amsterdam-based IMC runs the third-biggest designated market maker at the NYSE and oversaw trading in 18% of stocks listed on the ...