The haiku LMS Domain Control provides a feature where schools and districts to export grades as .CSV files.  

Domain Administrators (superusers) can access this functionality under the Reports tab in your domain admin.  

From the reports tab you can use Customize Columns to select the fields you wish to have exported, and then set the filters to control what data you wish to include in this particular export.

If this is a particular set of filters and columns that you will use again, you can use the Save This View to capture the settings for later access.

When you are ready to generate your export file, click on Export to CSV.

 Note: Teachers can also export grades for each of their classes from the Reports link under the Assess tab in their classes.