1 for 1 forward split/ My definition
It is when a company locks out shareholders who owned before the announcement. In the process they start dumping shares on the market. Moreover, creating a new temporary float. Thus, they move very quickly in both directions.
Generally it is a 5%-10% gain in shares for the shareholders who bought before the announcement of the forward split. That's why it is a 1 for 1 split. Usually the pre-existing float is locked out for a few weeks. $$$$$$$