A stop run is a sequence of consecutive stop orders in the same direction.
The Stop order type is an order that, when accepted, does not immediately go on the book but must be 'triggered' by a trade in the market at the price level submitted with the order. There are two types of Stop orders: the Stop-Limit, which goes on the book as a Limit order when activated, and the Stop with Protection, which goes on the book as a Market order. Source: CME Wiki
In this example, someone placed a market order of 300 lots (the 'trigger'), which increased the price by 2 ticks. The price movement triggered the first two stop orders, so they were executed as market orders of 30 and 70 lots. This pushed the price further up by 1 tick, which triggered the third stop order of 10 lots. During this stop run, 3 stop orders with a total volume of 110 lots were triggered.
