Dorn and others did not immediately describe other details such as the reasons Twitter or Phillips 66 were added or other companies dropped. Among other big ESG ratings agencies, MSCI Inc (MSCI.N) gives Tesla an "average" ESG rating, while the Sustainalytics unit of Morningstar Inc gives Tesla a "medium risk" rating, according to the firms' websites. On Wednesday a US safety regulator opened a special crash investigation into a Tesla crash this month in California, among more than 30 crashes under investigation involving advanced driver assistance systems. [nL2N2XA2CY] In February, a California state agency sued Tesla over allegations by Black workers that the company tolerated racial discrimination at an assembly plant, adding to claims made in several other lawsuits.