In recent years, investors have become more concerned about where they invest their capital and how to spread the risk among different asset types. The interest in commercial real estates has increased as this market is seen as less volatile than the stock market. Previous research for other economies has found that the commercial real estate market and the stock market do not cointegrate. Therefore it is possible to invest in both asset classes to create diversified portfolios. This thesis examines if such cointegration relationship exist on the Swedish market. Furthermore, the thesis examines the correlation and the lead-lag relationship between the two asset classes.

The observed data is quarterly between the years 1994-2013 and the indices used are OMX Stockholm, sold multi-dwelling and commercial buildings, and sold manufacturers industries. To examine if there exist any cointegration between the indices the Engle-Granger 2-step method is used and the lead-lag relationship is tested by using the Granger Causality test.

The results from the different tests do not show any short- or long-term relationship between the Swedish stock market and the Swedish commercial real estate market, neither do the assets show any lead-lag relationship. This means that the portfolio risk decreases and it is therefore possible for investors to diversify their portfolios with both short- and long-term time horizons.