At a given stock allocation level, SRI and Betterment portfolios are highly correlated based on historical data. For example, at 70% stocks, these portfolios have a 99.8% correlation. We expect the performance of an SRI portfolio to closely track that of a Betterment portfolio at a given stock allocation level. However, an SRI portfolio will have a slightly higher fund fee than a corresponding Betterment portfolio. You can read more about this in our white paper.