The National Stock Exchange (NSE) issue will open for public subscription on September 17 and close on September 21. The NSE on Wednesday garnered Rs 6,746 crore from anchor investors, including state-owned Life Insurance Corporation of India (LIC), Goldman Sachs and Fidelity, ahead of the opening of its much-awaited IPO subscription. NSE is among the top five holdings of LIC, whose existing stake in the exchange is larger than the portion being offered through the initial public offering (IPO).