When a company comes with an IPO, it prints and circulate/distribute IPO application forms among the investors. To subscribe to an IPO, Investors have to fill an application form. These forms are made available with syndicate members, brokers, sub-brokers, Investment advisors and generally also available in stalls outside the stock exchanges, Banks and with vendors in various other areas.

The forms can also be obtained from the websites of the company or registrar's of the issue. Once you get the form, you have to fill it, remit the amount after calculating the number of shares applied for in the bank that is designated in the form as collecting centre

for that IPO. Investors have to provide the details of their Demat account and bank account in the form. In a book built issue, the investors have choice to bid at the price as per their decisions.

You can also apply for physical share if issue size is less than Rs 10 crore. If issue size is more than that you have to apply for Demat shares only. It is advisable to apply for shares in the Demat mode as shares are tradable only in Demat mode, apart from other benefit of Demat.