Open Mainboard IPO

Mainboard Issues Open Today — 5 September 2026

No Mainboard issue is open for subscription as of 5 September 2026. Bidding windows usually run three working days, so this list fills again as soon as the next issue opens. Browse every IPO → · What is scheduled next →

Bidding on an Open Mainboard IPO

Mainboard book-building is the more forgiving of the two regimes, and the category structure works in a retail applicant's favour — provided you understand which pool you are actually competing in.

• Use the cut-off price option. Still available for Mainboard book-built issues, it bids automatically at the final issue price, so your application cannot be excluded for having named a number below the discovered price.
• Retail is reserved and small. SEBI's profitability route sets a minimum 35% retail reservation against a maximum 50% for QIB and minimum 15% for NII, with the retail application at roughly Rs 14,000–16,000. Allotment inside retail is a draw of lots at one lot per applicant, so a larger retail bid does not improve your odds.
• Know which NII pool you are in. Rs 2–10 lakh is small NII, above Rs 10 lakh is big NII, and they are closed pools that compete only against themselves. Both allot by draw of lots at the minimum NII lot — proportionate NII allotment ended in 2022.
• Above Rs 5 lakh, use ASBA. The UPI ceiling makes bank-block the only route for big NII applications.
• The anchor book is already public. Anchors are allocated one working day before the issue opens, so you can read the institutional list before committing. QIB is allotted proportionately, not by lottery.

Watch the QIB multiple build over the final day — it is the most reliable in-window signal of institutional conviction. More on anchor investors →

IPO investing carries risk of capital loss, allotment is not guaranteed, and grey market premium is an unofficial signal rather than a prediction. Nothing here is investment advice — read the offer document and consult a SEBI-registered adviser before committing capital.