premise: The company has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of August 2016 it had a market capitalisation of £81 billion (around $107 billion), the fourth largest on the London Stock Exchange. It has a secondary listing on the New York Stock Exchange.
hypothesis: As of August 2016, the company was listed on the New York Stock Exchange. 
reason: It is stated the company was the fourth largest on the London Stock Exchange in August of 2016 but it doesn't specify whether it was listed on the NYSE before or after that date. 