This study seeks to answer whether the ex post investor sentiment proxy of Baker and Wugler (2006, 2007) has a similar effect on the Swedish stock market, and if there is a varying sectoral dependency of this proxy. The paper considers firm-level data from 38 small-cap firms listed on the OMXS30, in a comparison to 137 small-cap firms listed on the NYSE to draw conclusions on whether the dependency structures are similar on the firm-level. To investigate the sectoral level, 27 market-wide sector indices are considered. The result points towards there being national differences in the firm-level adoption of the proxy between Sweden and the U.S. but also that there are sectoral differences as to whether the sentiment proxy is more or less useful. The conclusions drawn are based upon the proxy’s effect on segmented regressions.