"It may be noted that, the exchange has not issued any circular for revision of the market timings for closing session," NSE said in a statement.
The stock exchange said it noticed that a forged circular is being circulated, using the name and logo of the exchange, bearing download ref no: NSE/CMTR/36012 and circular ref. no: 305/2017, dated September 21, 2017 stating that the market timings for closing session have been revised by the exchange.
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The trading on the exchange take place between 9 am and 3.30 pm with 15 minutes each of pre-open and post-closing sessions.
The forged circular which is doing rounds on Whatsapp states that NSE will close trading session after 5 pm.
"The exchange has not revised the market timings for closing session," NSE said.
"Request all members, investors and concerned stakeholders to verify the source, content and authenticity of such circulars, by visiting the official site of the exchange, before taking any action on the basis of the same," it added.