5 percent rise in US store sales last quarter. This boost has allowed the chain to surpass McDonald's by the largest margin in over a decade. The sales increase is attributed to a new Whopper, which has helped Burger King gain ground in the burger market.

As a result, the chain has become the second-largest burger chain in the US, behind McDonald's. Further details about Burger King's sales and market performance are available from the source, including comments from executives and information about the company's portfolio.