The National Stock Exchange (NSE) released final guidelines on Monday, December 1, to align with SEBI’s directive to reduce concentration in indices that have futures contracts, including the Nifty Bank.

Key Changes to the Nifty Bank Index:

1. Weightage Caps: The weightage of the top three constituents will now be capped at 19%, 14%, and 10%, respectively.
2. New Entrants: The number of index constituents will increase from 12 to 14. Analysts expect Yes Bank and Union Bank of India to be added to the index.
3. Implementation Timeline: The changes will take effect from the close of December 30 and will be implemented gradually across four tranches.

Impact on Major Banks:

• HDFC Bank will see its weight drop from 27.5% to 18.9%.
• ICICI Bank's weight will fall from 23.1% to 14%.
• State Bank of India will see its weight increase slightly from 9.4% to 10%.

According to Nuvama Alternative & Quantitative Research, this rebalancing is likely to trigger passive outflows of approximately $330 million each from HDFC Bank and ICICI Bank, spread over the four tranches.

Market Reaction:

• Decliners: Reflecting the expected outflows, shares of HDFC Bank fell 1.5% and ICICI Bank dropped 1.3%.
• Gainers: Anticipating inflows from index inclusion, shares of Union Bank of India rose 3%, while Yes Bank gained 1.8%.