Shares of BSE Ltd plunged 5.16% to ₹6,928 on Wednesday after reports indicated that SEBI is likely to grant approval to the National Stock Exchange (NSE) to introduce Tuesday as its weekly index expiry day. The move has sparked concern that BSE may lose significant recent market share gains in the derivatives segment.
According to a CNBC-TV18 report citing sources, SEBI’s circular on expiry day regulations for exchanges may be issued soon. The NSE has formally applied to shift its weekly F&O expiry day from Thursday to Tuesday—a slot already occupied by BSE for its Sensex derivatives. SEBI’s Secondary Market Advisory Committee (SMAC) recently met to review the framework and is expected to take a final call.
Earlier this year, NSE had proposed shifting expiry to Monday but later deferred the plan after SEBI issued a draft consultation paper. Currently, all NSE contracts expire on Thursdays.
Reports from ET Now indicate that SEBI’s final circular is likely to clarify allowed expiry days and prevent overlap across exchanges. The aim is to ensure orderly trading, reduce volatility, and avoid competition-driven expiry shifts. Exchanges may be required to align their expiry calendars per SEBI’s guidance.
This development is being seen as negative for BSE, which had gained derivatives traction in recent quarters after introducing Tuesday expiries.
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