Popular Fluid Response Magento Theme.
https://themeforest.net/item/ultimo-fluid-responsive-magento-theme/3231798 This is an affiliate link FYI.
Frameworks · Magento Theme
Get access to data on 64,519 websites that are Ultimo Customers. We know of 20,673 live websites using Ultimo and an additional 43,846 sites that used Ultimo historically and 4,042 websites in the United States.
Get a list of 64,519 websites using Ultimo which includes location information, hosting data, contact details, 20,673 currently live websites and an additional 14,362 domains that redirect to sites in this list. 43,846 sites that used this technology previously and 4,042 websites in the United States currently using Ultimo.