NSE to align pre-open auction with closing auction session Revised pre-open framework to take effect from September 7 Pre-open remains 9:00–9:15 am, but order process changes Market and limit orders allowed only in first five minutes; Only limit orders allowed from 9:05-9:10 am Order matching and opening price determination shift to 9:10-9:12 am Market-market orders get first priority in pre-open matching
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