Van der Moolen Holdings N.V. is a transatlantic securities trading firm that principally engages in the trading of equities, equity options, equity index options and bonds on securities exchanges in the United States and Europe. Operating through eight principal subsidiaries, the Company functions as an all systems trader, providing liquidity in different time zones on exchange floors and electronic trading systems through its role as specialist or market maker. Acting as a counterparty to market professionals such as banks and brokerage firms, the Company transacts an average of over 60,000 transactions a day.