We empirically examine whether risk-taking by publicly traded US companies declined significantly after adoption of the Sarbanes-Oxley Act of 2002 (SOX). Several provisions of SOX are likely to discourage risk-taking, including an expanded role for independent directors, an increase in director and officer liability, and rules related to internal controls. We find several measures of risk-taking decline significantly for US versus non-US firms after SOX. The magnitudes of the declines are related to several firm characteristics, including pre-SOX board structure, firm size, and R&D expenditures. The evidence is consistent with the proposition that SOX discourages risk-taking by public US companies.