The 'Change Owner' button is not visible on lead list view for lightning view even for system administrator which has all the permissions including 'Transfer lead', 'Modify All', 'View All' for Lead and "Modify All data" under administrative permission. As per Winter '17 releases Trailhead, it should be visible as below.
Till now this button isn't supported in lightning.We need to approach for custom solution. Create a custom button and assign a Visual Force Page (with the logic of changing owner) to it. And add that custom button to the list view of Lead for Mass change of Owner.