Four American authors made the cut, including Joshua Ferris and Karen Joy Fowler.
Mantel's short story collection, reportedly titled 'The Assassination of Margaret Thatcher,' follows her critically acclaimed historical novels 'Wolf Hall' and 'Bring Up the Bodies.'
The prestigious UK writing prize will now be open to any works that are published in the UK and were written in English.
News reports are saying American authors will be considered for the prestigious UK literary prize next year, while the Booker Prize organizers say these stories are 'incomplete' but haven't discounted the possibility.
Books including 'The Lowland' by Jhumpa Lahiri and 'We Need New Names' by NoViolet Bulawayo made the shortlist for the Man Booker Prize this year, and some are calling the shortened list of nominees the best in years.
While some books on this year's Man Booker prize long list have gotten buzz here in the US, none of them compare (so far) with the success of last year's winner, Hilary Mantel's 'Bring Up the Bodies.'
Tan Twan Eng captured the 2012 award for his book 'In the Garden of Evening Mists.'