BSE share price fell nearly 6% as SEBI is likely to grant Tuesday's trading expiry to NSE, putting BSE at a disadvantage.SEBI may finalize a proposal to set equity futures and options expiries on Tuesdays and Thursdays.NSE has shifted the expiry days of various contracts to align with the new schedule, affecting BSE.BSE shares declined by 5.61% to Rs 6,895 apiece, the lowest level since May 12, amidst these developments.