The fund invests in large- and mid-cap companies with strong ESG traits, while maintaining an overall market-like portfolio. Companies in the broad MSCI USA Index are rated on risk factors related to environmental (carbon emissions, water use, toxic waste), social (labor management, health and safety, sourcing), and governance issues (corruption, fraud, anti-competitive practices). Portfolio optimization software is used to maximize the funds stake in highly-rated companies while staying true to a market-like exposure. Additionally, the fund completely excludes tobacco companies, producers of certain weapons (landmines and bioweapons), and companies experiencing severe business controversies. The index is rebalanced quarterly.