Who owns Bitstamp?

Who exactly is the owner or owners of Bitstamp, the popular cryptocurrency exchange platform? Are they individuals, a group of investors, or a company? Can you provide some background information on the founding of Bitstamp and how the ownership structure has evolved over time? Is there any transparency around the ownership of Bitstamp, or do they operate with a degree of anonymity? Are there any notable investors or stakeholders in Bitstamp that one should be aware of?