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can be exercised at any time prior to expiry. Most
are American Style, but Index
which means they can only be exercised on the expiry date (see the
definition for more details).
Note that the terms 'European' and 'American' have no relationship with the geographical location of the venue where a given instrument is traded, so it is possible to have American Style
on European stocks.
Related Directory Entries
Suggest a Link Option Style
Wikipedia article on Option Styles. Covers more than European and American definitions and includes some more obscure styles also.
Investopedia definition of American Style Options.
Option Styles: American Vs. European
Detailed explanation of American vs European style options.
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