SolarWinds Corporation is an American company that develops software for businesses to help manage their networks, systems, and information technology infrastructure. It is headquartered in Austin, Texas, with sales and product development offices in a number of locations in the United States and several other countries. The company was publicly traded from May 2009 until the end of 2015, and again from October 2018. It has also acquired a number of other companies, some of which it still operates under their original names, including Pingdom, Papertrail, and Loggly. It had about 300,000 customers as of December 2020, including nearly all Fortune 500 companies and numerous agencies of the US federal government. A SolarWinds product, Orion, used by about 33,000 public and private sector customers, was the focus of a large-scale attack disclosed in December 2020. The attack persisted undetected for months in 2020, and additional details about the breadth and depth of compromised systems continued to surface after the initial disclosure. In February 2021, Microsoft President Brad Smith said that it was "the largest and most sophisticated attack the world has ever seen".