Instinet

What Does Instinet Mean?
An electronic securities order matching (trading) and information system that allows members (primarily professional traders and investors) to display bid and offer quotes for stocks, and to transact between themselves using brokers. As a global securities broker, Instinet enables more than 1,500 institutional customers to trade securities in more than 40 global markets.

Investopedia explains Instinet
Instinet (Nasdaq: INET) is Wall Street's oldest and largest electronic communications network (ECN), and since it was acquired by Reuters Group (Nasdaq: RTRSY) in 1987, it and other ECNs have evolved into major threats to the established stock exchanges.