The National Stock Exchange has extended the trading timing in equity and equity derivative segments by nearly an hour to 9 am,effective from Friday. "NSE has advanced the trading timing to 9 am and the extension would be effective from December 18,Friday. The market closing time will remain same at 3.30 pm," an NSE official said. The trading hours have been extended from the earlier 9.55 am to 3.30 pm. "With the change in market timings by other exchanges our participants were left with no choice but to extend the timing," NSE Managing Director Ravi Narain told a private TV news channel. On Tuesday the Asia's oldest bourse Bombay Stock Exchange had increased the trading time by 10 minutes to 9:45 am from Friday in the equity,equity derivatives and block deal segments in order to leverage from the pre-lunch trading sessions in the Singapore and Hong Kong Stock Exchange. "We would closely coordinate with the BSE regarding the change of timing," Narain said. In October market regulator Securities and Exchange Board of India (SEBI) approved extension of the trading timings by up to two-and-a-half hours from 9 am to 5 pm.