Quote from justrading:
According to this, in 2011 there were 40 countries. http://en.wikipedia.org/wiki/Financial_transaction_tax
Not all 40 are listed though.
Many countries have some form of FTT or stamp duty, but the tax is usually limited to equity shares traded on local exchanges. Many transactions (currencies, options, futures, etc.) are excluded. Also, market makers (banks and investment firms) are usually exempted. In most countries with an FTT, only a small percentage of financial transactions are subject to the tax.
Learn more at: http://financialtransactiontaxes.com/