Even more, since the start of the year, the BK stock has jumped an amazing 55.7%. it could be explained by the gradual stability in US economy which has allowed more customers to spend on fast-food items. But on the other hand, McDonald’s stock has been flat this year, with a surge of slightly more than 1%.
Where are you seeing this? QSR is up about 3.5% ytd. That is the ticker for Restaurant Brands International, which is BK and Tim Horton's
If you look at the chart for Burger King on google finance (https://www.google.com/finance?q=BKW), you'll see that the last day traded is December 12th. Google Finance is not being actively maintained by Google, so it's a take-it-or-leave-it site. Just a matter of time before someone pulls the plug on it...