Each column header in Mattermark is able to be filtered and sorted so you only see the companies that matter to you. In essence, it's similar to setting up a Saved Search, but rather than select the preset filters or Advanced Filters, you make adjustments on the column headers.
On the right-side of each column header, you will notice 3 small vertical dots. Clicking these will open up the sorting and filtering options for that particular column. For data points that are numbers, you can set a minimum and maximum. You can then sort in ascending or descending order. Text data points allows for sorting alphabetically A -> Z or Z -> A.