Kerb

Kerb can signify both the unofficial stock market on which trading operations are processed after market closure, as well as informal deals. As a general rule, such operations are processed by brokers on the order of clients when, for some reason or other, their orders couldn’t be processed on the stock market. Originally, the Kerb was what the market called deals which took place outside of the official New York Stock Exchange in the second half of the 19th century.