iShares MSCI South Africa ETF (EZA US) – Portfolio Construction MethodologyThe underlying MSCI South Africa 25/50 Index delivers free float-adjusted, market-cap-weighted exposure to South African large- and mid-caps, targeting roughly 85% of the investable equity universe. Constituents come from the MSCI South Africa parent after investability screens on free float, foreign ownership limits, and liquidity (e.g., ATVR/DTV tests), with standard MSCI buffer rules to limit turnover. Weights are then optimized t ...