You can extract report data manually in Marketo and sent the file to another system.
Or you can use the subscription system that can send the data in an Excel file in a email to any email address. You could use this subscription system to send the email to another system. The third party system would have to parse the email, get the file and open it to extract the data.
The other possibility would be to extract the raw data from Marketo activity log using the API and compile.
What exactly do you wan to achieve ?