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 41,653 websites that are Ultimo Customers. We know of 10,460 live websites using Ultimo and an additional 31,193 sites that used Ultimo historically and 3,156 websites in the United States.
Get a list of 41,653 websites using Ultimo which includes location information, hosting data, contact details, 10,460 currently live websites and an additional 12,533 domains that redirect to sites in this list. 31,193 sites that used this technology previously and 3,156 websites in the United States currently using Ultimo.