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 77,819 websites that are Ultimo Customers. We know of 19,139 live websites using Ultimo and an additional 58,680 sites that used Ultimo historically and 3,771 websites in the United States.
Get a list of 77,819 websites using Ultimo which includes location information, hosting data, contact details, 19,139 currently live websites and an additional 13,545 domains that redirect to sites in this list. 58,680 sites that used this technology previously and 3,771 websites in the United States currently using Ultimo.