What do you think is most overvalued?

As the second half of the year gets into swing, investors are becoming wary about certain trades given stellar gains in the first half of the year.

The Dow Jones Industrial Average, for example, rose nearly 2 percent in the first half while the pound surged 4 percent, making it one of the world's best-performing currencies so far this year.

Read MoreThese bets on underperformance are paying off

The technology sector has also been on fire with heavyweights Facebook more than 20 percent higher and Apple notching up gains of 17 percent.

Vote in our new poll and tell us which you think is the most frothy.