BSE has announced the shift in the expiry of weekly contracts of Sensex from Tuesday to Thursday starting Sep, 01 2025. Motilal Oswal believes that this shift will lead to a loss in market share for BSE in terms of premium turnover, which stood at 22.6% in May'25. Currently, each of the days accounts for 18-22% share in the week's total premium volume. BSE has a market share of 8% on Wed/Thu and 21%/24%/38% on Fri/Mon/Tue.
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Motilal Oswal Report
BSE Ltd., under the new regulations, has shifted the expiry of Sensex to Thursday from Tuesday. We note that after the implementation of new F&O regulations (effective March 2025), in weeks where markets were open on all five days, the share of each day was in the 18-22% range.
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BSE had an average market share of 8% on Wednesday and Thursday (days influenced by Nifty's expiry). On Friday/Monday/Tuesday, the premium turnover market share was 21%/24%/38%.
Assuming the recent trends and overlaying them on day-wise share in volumes for the industry, we believe that BSE's market share can be in the range of 18-19% (from 22.6% in May'25).
The impact of these measures will be visible from Sep-25 when the new contracts kick in.
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