Premium results include our most accurate data - data that has been validated most recently and with our strongest criteria. Additional results include data that has been validated a little longer ago or using slightly weaker criteria. Our additional results can still provide great coverage and accuracy, but we don't show these contacts by default.
By default, search results always include our premium data. We will give you the option to view the additional results, to ensure that you have enough coverage to complete your prospecting efforts. If you enable this option, premium data will be shown with a star icon and will come to the top of your results by default. You may re-sort the results by company, job title, or name, as you choose. You may also suppress the additional results, if you choose not to use them, by turning the feature off again with the switch provided.
In a contact export, premium data is denoted as Tier 1. You may wish to track this field in order to prioritize your efforts.