Warsaw's first stock exchange was established in 1817 and continued trading until World War II. It was re-established in April 1991, following the end of a communist planned economy and the reintroduction of a free-market economy. Today, the Warsaw Stock Exchange (WSE) is, according to many indicators, the largest market in the region, with 433 companies listed and total capitalisation of 1 trillion PLN as of 26 November 2020. From 1991 until 2000, the stock exchange was, ironically, located in the building previously used as the headquarters of the Polish United Workers' Party (PZPR).