The iShares MSCI KLD 400 Social ETF is the tracker fund for the Morgan Stanley Capital International KLD 400 Social Index, which provides exposure to companies with high ESG ratings. Launched in 1990, it is considered one of the first socially responsible investment indices. 1 The MSCI KLD 400 Social Index comprises of 400 companies, which can be large-, mid- and small-cap US companies, across a variety of sectors.