You can export customer data in the Portfolio > List view

Use the the check boxes to select the customers from the list you would like to export. Then navigate to the actions menu in the top right and select export to excel 

When exporting this way, you're able to use the global filter (accessed from the tab on the right side of the screen) to export the companies that meet the filter criteria. This also works for segments so you can easily filter and export your customer segments

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