Omgeo, the US trade matching supplier to 6,000 brokers and fund managers, will next month replace its outgoing president and chief executive, who has led the firm since its inception in 2001, with the head of the system supplier to the New York Stock Exchange.

Marianne Brown, the former chief executive of the Securities Industry Automation Corporation, will replace Adam Bryan as Omgeo chief executive and president at the start of next month.