ICICI Prudential Life Insurance shares gained on Monday on the Bombay Stock Exchange (BSE) but investors who subscribed to the private insurer's initial public offering (IPO) last month won't feel enthused about it. The stock closed 2.40 percent higher at Rs. 324.65, still below the issue price of Rs. 334 per equity share. ICICI Bank shares closed almost flat at Rs. 250.10 apiece.