"Due to technical reasons in the cash market, trading has been stopped in cash and F&O segment of the NSE", the exchange said.
The company has received final approval to market its Flucytosine capsules USP, in the strengths of 250 mg and 500 mg, from the United States Food and Drug Administration (USFDA), Lupin said in a statement.
The NSE re-opened markets at 1230 p.m. India time (0700 GMT), about three hours after the usual trading start time, after earlier attempts to resume trading failed.
On BSE, 1,540 stocks advanced, while 1,112 declined and 157 remained unchanged.
The stock exchange said that it shut down F&O segment at 9.55 am. NSE also received queries as to whether today's technical glitch was related to cyber-attack.
The NSE also said the currency derivative segment was functioning normally. Two sources familiar with the matter said it was an internal issue, ruling out any external cyber attack or hacking.
Amid concerns raised in certain quarters on why trading activities were not shifted to the back-up system, the NSE said that shifting would have taken longer. According to the recommendation, which NSE was against adopting, any eventuality arising out of a technical snag such as the one that paralysed the bourse could have been avoided. Noting that the preliminary assessment indicated a software problem, the exchange ruled out the possibility of cyber attack causing the technical glitch.
"NSE deeply apologises for the glitch".
"We have a target of 32,000 for the Sensex by the end of the year, and probably, we could end breaching the level", said Rajen Shah, Chief Investment Adviser, Tradebulls.