This article mentions one of several metrics we offer regarding top holders addresses. Please check this article for an introduction on 'Top Holders' and the complete list of metrics offered.
This graph shows the total number of new addresses entering the top holders list.
The amount of top holders addresses included in the calculation can be chosen at the top by selecting 'HoldersCount'. The HoldersCount in the above screenshot of BAT's changes to the top holders list is set to 50. So at the day shown in the screenshot, three out of 50 addresses where not in the 50 top holders list the day before.
The assets's price can be displayed in USD or BTC, which can be selected through the 'Currency' field at the top.