Stock trading is being done all around the world, all the time, in various markets. Here’s a list of the top 10 largest stock exchanges in the world, as of June 2009, according to the World Federation of Exchanges.

1. New York Stock Exchange: $9.57 trillion in market value
The New York Stock Exchange (NYSE) is located on famous Wall Street in lower Manhattan, New York City, and has been around since 1792. Although it is a listed exchange with physical trading floors and rooms, all stocks on the NYSE can now be traded electronically, electronic transactions representing most of the trades performed. In October 2008, it was merged with the American Stock Exchange (AMEX), and is now the largest stock exchange in existence. It is open Monday through Friday from 9:30 to 16:00 Eastern Time, except on holidays.

2. Tokyo Stock Exchange: $3.10 trillion in market value
The TSE, or Tokyo Stock Exchange, was created in 1878. More than 2000 companies are listed on the TSE and its main indices are the TSE and the famous Nikkei 225. Most security transactions in Japan are done through the TSE, which operates entirely on electronic stock trading. It is open from 9:00 to 11:00 and from 12:30 to 15:30 (GMT + 9 hours).

3. NASDAQ Stock Exchange: $2.77 trillion in market value
The NASDAQ, or National Association of Securities Dealers Automated Quotations, is the largest virtual stock trading market in America. Unlike the NYSE, the young Nasdaq (founded in 1971) doesn’t have a history of trading floors and rooms to physically trade stocks. Stock trading is done entirely through an electronic network of dealers; it is an electronic screen-based stock market. It is open Monday through Friday from 9:30 to 16:00 Eastern Time (minus holidays) and offers pre-market and post-market trading sessions extending these hours from 7AM to 8PM, Eastern Time.

4. Euronext: $2.26 trillion in market value
Based in Paris and with branches across Europe, Euronext was born in 2000 from the merger of the Amsterdam Stock Exchange, Brussels Stock Exchange and Bourse de Paris. It subsequently went on to perform other mergers and share acquisitions, to today become the fourth largest stock exchange in the world. It merged in 2006 with the NYSE to create the NYSE Euronext corporation, which now oversees both exchanges. Its opening hours in Europe are from 9:00 to 17:30, local time to the branch in question.

5. London Stock Exchange: $2.20 trillion in market value
Founded in 1801, the London Stock Exchange (LSE) is located in London and lists over 3000 British and overseas companies. It has a number of indices, the most common being the FTSE 100 and FTSE 250. Opening hours are 08:00 to 16:30 on weekdays.

6. Shanghai Stock Exchange: $2.07 trillion in market value

7. Hong Kong Stock Exchange: $1.77 trillion in market value

8. Toronto Stock Exchange: $1.35 trillion in market value

9. Frankfurt Stock Exchange (Deutsche Börse): $1.13 trillion in market value

10. Madrid Stock Exchange: $1.08 trillion in market value

Other notable big stock trading markets are the Bombay Stock Exchange ($1.03 trillion), the National Stock Exchange of India ($968 million), the Sao Paulo Stock Exchange ($920 million), the Swiss Exchange ($854 million) and the Australian Securities Exchange ($839 million).