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The Securities and Exchange Board of India (Sebi) is looking at the diversification risk from bank exchange-traded funds (ETFs) investing in stocks of the banking indices of the two major bourses.Of a total of 12 banking scrips in the National Stock Exchange's Nifty Bank index, three -- HDFC Bank, ICICI and Kotak Mahindra -- contribute 45 per cent to the index weight. The bottom five contribute five per cent. Similarly, for the BSE exchange's Bankex, the top five out of 10 stocks contribute four-fifths to the weight. These indices are created on a free-float method. Here, the price is multiplied by the number of shares readily available in the market and excludes locked-in shares held by promoters, government, etc.Under the diversification norms, mutual fund (MF) schemes cannot invest more than 10 per cent in a single stock. However, this rule is not applicable to ETFs, as these mimic the weight of stocks that comprise the ETF basket. While open-ended sectoral funds can reset the ...