Signet Jewelers Ltd. is the world's largest retailer of diamond jewellery. The company is domiciled in Bermuda and headquartered in Akron, Ohio, and is listed on the New York Stock Exchange. As of 14 March 2016 the company has been delisted from the London Stock Exchange, following reports that less than 1% of their annual trading volume was conducted via the platform. The group operates in the middle market jewellery segment and has number one positions in the US, Canada and UK speciality jewellery markets. Certain brands operate in the upper middle market. Signet Jewelers owns and operates the companies Zales, Kay Jewelers, Jared, JamesAllen.com, and others. The group was founded in 1949 and grew organically before expanding rapidly through a series of acquisitions in the late 1980s and early 1990s. It was formerly known as the Ratner Group.