Cash sweeps are administrative transfers between your personal flatexDEGIRO cash account and your DEGIRO account. Every hour of every business day, a calculation is made to determine if more money has been added to your DEGIRO account, or whether more money has been spent.
For example, if you have bought shares for a higher amount than sold, an administrative booking (cash sweep) will take place from your personal cash account to your DEGIRO account. If you have sold shares for a higher amount than purchased, the difference will be transferred to your personal cash account by means of an administrative booking (cash sweep) from your DEGIRO account.
You can view the hourly cash sweeps on your account statement by turning off the slider at 'Hide cash movements’.