New Delhi, May 26 -- The battle for market share between the National Stock Exchange (NSE) and BSE Ltd is set to intensify after the market regulator formalized the expected changes in weekly index expiry.

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Any stock exchange can launch a single weekly expiry contract either on Tuesday or Thursday, according to the Securities and Exchange Board of India's (Sebi's) Monday circular on the settlement day of equity derivatives.

"Now that the circular has been issued, NSE would like to shift its Nifty weekly options expiry to Tuesday from Thursday," said a person aware of the development. "A request to this effect has been made to the regulator." ...