Investor activism through shareholder proposals has increasingly focused on social and environmental issues over the past five years. The authors analyzed over 2,600 shareholder proposals from 1997-2012 and found that 58% concerned issues deemed immaterial to financial performance by SASB standards. However, targeting both material and immaterial issues through proposals was associated with improved company ESG performance. Proposals on material issues were also linked to increased market valuation, while those on immaterial issues saw decreased valuation. The authors suggest management may respond to immaterial issues due to misaligned incentives, an inability to distinguish materiality, or to distract from material issues. Overall, investor activism can drive both social responsibility and financial outcomes when focused on material ESG issues.