Student Investment Groups at Bentley Bentley Investment Group (BIG) The Bentley Investment Group (BIG) is a student organization that is responsible for managing a portion of the university’s endowment. Bentley Investment Group Bentley Sustainable Investment Group (BSIG) BSIG is a long-only domestic equity fund that follows sustainable, responsible, and impact investing (SRI) strategies with approximately $600,000 of the school’s endowment. Bentley Sustainable Investment Group