Shares of Mrs. Bectors Food Specialities made a strong debut on the bourses on Thursday. The Initial Public Offering (IPO) of the company was concluded last week. The biscuit and bread manufacturer was listed at Rs 500 on the National Stock Exchange (NSE), 74 per cent to its issue price of Rs 288. Within moments of listing the stock surged to the day's highest price of Rs 592.40. The stock was locked in the upper circuit of 20 per cent of Rs 601.20 on BSE.