Question: How many New York Stock Exchange listed companies are under this American businessman and entrepreneur's leadership who founded AutoNation?
Context: The Tokyo Stock Exchange (東京証券取引所 , Tōkyō Shōken Torihikijo ) , which is called Tōshō (東証 ) or TSE/TYO for short, is a stock exchange located in Tokyo, Japan.  It is the fourth largest stock exchange in the world by aggregate market capitalization of its listed companies, and largest in East Asia and Asia.  It had 2,292 listed companies with a combined market capitalization of US$4.09 trillion as of April 2015. Founded by H. Wayne Huizenga in 1996, AutoNation has become the largest automotive retailer in the United States and is the leading provider of new and pre-owned vehicles and associated services in the US.  The company currently owns and operates over 360 retail operations throughout the continental US and is currently led from its Ft Lauderdale, Florida headquarters by the Chairman, Chief Executive Officer Mike Jackson, former President of Mercedes-Benz North America. China Concepts Stock is a set of stock of companies whose assets or earnings have significant activities in mainland China.  The People's Republic of China is undergoing major financial transformation, and many leading mainland-based companies have chosen to list themselves overseas to gain access to foreign investor capital.  Currently, there are China Concepts Stocks listed on several major stock exchanges around the globe, including the Hong Kong Stock Exchange (HKEx), Singapore Exchange (SGX), New York Stock Exchange (NYSE), NASDAQ, NYSE MKT (formerly known as the American Stock Exchange), London Stock Exchange (LSE), Euronext, and the Tokyo Stock Exchange (TSE). The Financial District, also known as FiDi, is a neighborhood located at the southern tip of the borough of Manhattan in New York City, which comprises the offices and headquarters of many of the city's major financial institutions, including the New York Stock Exchange and the Federal Reserve Bank of New York.  Anchored on Wall Street in the Financial District, New York City has been called both the most financially powerful city and the leading financial center of the world, and the New York Stock Exchange is the world's largest stock exchange by total market capitalization.  Several other major exchanges have or had headquarters in the Financial District, including the New York Mercantile Exchange, NASDAQ, the New York Board of Trade, and the former American Stock Exchange. Harry Wayne Huizenga ( , born December 29, 1937) is an American businessman and entrepreneur.  He has been involved in the founding of three Fortune 500 corporations and is responsible for six New York Stock Exchange listed companies.  He has also been an owner of three top tier professional sports franchises. The Nigerian Stock Exchange (NSE) was established in 1960 as the Lagos Stock Exchange.  In 1977, its name was changed from the Lagos Stock Exchange to the Nigerian Stock Exchange.  As at March 7, 2017, it has 176 listed companies with a total market capitalization of about N8.5 trillion.  All listings are included in the Nigerian Stock Exchange All Shares index.  In terms of market capitalization, the Nigerian Stock Exchange is the third largest stock exchange in Africa. The New York Stock Exchange (abbreviated as NYSE and nicknamed "The Big Board"), is an American stock exchange located at 11 Wall Street, Lower Manhattan, New York City, New York.  It is by far the world's largest stock exchange by market capitalization of its listed companies at US$21.3 trillion as of June 2017.  The average daily trading value was approximately 169 billion in 2013.  The NYSE trading floor is located at 11 Wall Street and is composed of 21 rooms used for the facilitation of trading.  A fifth trading room, located at 30 Broad Street, was closed in February 2007.  The main building and the 11 Wall Street building were designated National Historic Landmarks in 1978. The Buttonwood Agreement, which took place on May 17, 1792, started the New York Stock & Exchange Board now called the New York Stock Exchange.  This agreement was signed by 24 stockbrokers outside of 68 Wall Street New York under a buttonwood tree.  The organization drafted its constitution on March 8, 1817, and named itself the "New York Stock & Exchange Board".  In 1863, this name was shortened to its modern form, the "New York Stock Exchange". Indonesia Stock Exchange (Indonesian: "Bursa Efek Indonesia") is a stock exchange based in Jakarta, Indonesia.  It was previously known as the Jakarta Stock Exchange (JSX) before its name changed in 2007 after merging with the Surabaya Stock Exchange (SSX).  As of the end of 2016, the Indonesia Stock Exchange had 537 listed companies with a combined market capitalisation of IDR 5,753.6 trillion.  In mid September 2016, based on Single Identification Number there were 500,037 domestic investors, of which 487,713 were retail investors and 12,324 institutional investors.  As of September 21,2016 total daily transactions averaged more than 250,000, with an average value of Rp 6,400 billion/day. The Stock Exchange of Hong Kong Limited (SEHK) is a stock exchange located in Hong Kong.  It is East Asia's and Asia's third largest stock exchange in terms of market capitalization behind the Tokyo Stock Exchange and Shanghai Stock Exchange, and the sixth largest in the world before Euronext.  As of 31 October 2016, SEHK had 1,955 listed companies, 989 of which are from mainland China, 856 from Hong Kong and 110 from abroad (e.g. Taiwan, Malaysia, United States, Singapore, etc.) Hong Kong Exchanges and Clearing owns SEHK and is itself listed on SEHK.
Answer: six