A method of transacting different security orders that involves the accumulation of orders and their simultaneous execution. Taobiz explains Batch Trading For example, a security experiencing a relatively high volume of trades can have its orders batched and executed at the same time when the desired price is reached. Batch trading is more efficient for market makers and specialists because a large number of accumulated orders can be executed with fewer transactions. In the U.S., batch trading occurs for all orders sent to market after market hours. These orders are collected and batched until the market opens, at which time they are transacted all at once.