Fourth Market Instinet

If you're Joe Average and want to buy stocks or other securities, you need to muck about with brokers and exchanges to buy a piddly amount,

If you're a huge corporation or international institution buying huge amounts of stocks or other securities, you can buy on the fourth market. The fourth market lets big buyers buy directly without paying those brokerage fees. The company that handles these transactions electronically is called Instinet. Clever, with the whole "instant" riff, too.