The study aims to investigate the similarities and differences in the portfolio composition and in the risk-adjusted return between Socially Responsible Investments (SRI) funds and conventional funds. The study has used a quantitative research method and a comparative research design. Four hypothesis have been tested, using a t-test, to fulfill the purpose of the study. The result of the study is that there is both differences and similarities in characteristics of the portfolio between SRI funds and conventional funds. We found a significant difference in the number of holdings, the top ten holdings in relation to the total market value and in the riskadjusted return. Thus, this result is not consistent in all fund sizes. One characteristic, the number of industries represented in the top ten holdings, did not differ between SRI funds and conventional funds. By studying the most common top ten holdings in both fund types, many similarities are found.