The new norms could lead to most OFS taking place on Mondays.
Currently, the companies are required to give an advance notice of two trading days before the OFS, which the government has been saying gives scope for the speculators to beat down the share price of the disinvestment-bound PSUs.
The new norms would help reduce the gap between the disclosure of the OFS and the actual share sale in cases where the intermediate days include trading holidays when banks are open, such as Saturdays.
The change in the norms to banking days, instead of trading days, would mean that the notice can be given on Friday evening as Saturday can be counted as an intermediate banking day.
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The exchange has made the necessary changes in the OFS module and has enabled the segment to all trading members on iBBS (Internet Based Book Building System) platform of the bourse, BSE said in a circular.
"All trading members are allowed to access the module. No separate registration or payment of any charges is required currently to access the OFS segment on iBBS," it added.
The separate window would facilitate seller to dilute its holding in a transparent manner with wider participation.
Besides, it would be mandatory for sellers to provide the option to retail investors to place their bids at cut off price in addition to placing price bids.
Last month, capital markets regulator Sebi had issued the guidelines on the matter.