Sustainable Investments Institute (Si2) is a nonprofit that produces member-only access research reports dealing with corporate social policies and shareholder activism.
In fiscal year 2018, the Sustainable Investments Institute reported $345,340 in revenue, of which $247,173 came from contributions and grants and $98,167 came from program service revenue. It had $351,432 in expenses, of which salaries and benefits made up $202,885. The organization had $109,882 in assets at the end of the fiscal year. 
The Sustainable Investments Institute provides research to facilitate investors making activist shareholder proposals related to political and social issues. Si2 operates on a membership basis, and provides reports on environmental issues, political activity, human rights, animal welfare, diversity, and equitable lending, among other issues. Si2 can also be commissioned to write custom reports for clients. 
Select research is available to the public and includes issues such as the effect of corporate political spending on abortion rights, SEC rules and regulations, and analysis of shareholder proposals at large corporations such as Tyson Foods and Rite Aid. 
Si2 has been cited in numerous media reports dealing with social justice and diversity trends in business. 
Heidi Walsh is the founding executive director of the Sustainable Investments Institute. She has a long history of working on “corporate responsibility” issues since the 1980s and administered a monitoring program that checked corporate compliance with the MacBride principles for fair employment in Northern Ireland.