IPO lot size and minimum investment: how much can you apply?
Updated 26 October 2026 · 4 min read
The lot size is the smallest number of shares you can bid for in an IPO, and you can only bid in whole multiples of it. The minimum investment is one lot multiplied by the upper end of the price band. For mainboard IPOs, the minimum application value is set at around ₹10,000–15,000, so the lot size is worked out backwards from the price: a costly share means a small lot, a cheap share means a large one.
The maximum a retail investor can bid is ₹2 lakh, so the number of lots you can apply for depends on the lot value. SME IPOs follow different rules: since 2025 the minimum application is two lots, which puts it above ₹2 lakh. This guide shows how to work out both limits for any issue.
How the lot size is set
The company and its lead managers fix the lot size when they announce the price band. They pick a whole number of shares so that one lot at the cap price falls within the minimum application range set by SEBI. That is why lot sizes look odd — 142 shares, 37 shares, 1,250 shares — they are just whatever number brings the lot value into range.
| Upper price band | Possible lot size | Value of one lot |
|---|---|---|
| ₹105 | 142 shares | ₹14,910 |
| ₹420 | 35 shares | ₹14,700 |
| ₹1,200 | 12 shares | ₹14,400 |
| ₹28 | 535 shares | ₹14,980 |
Illustrative numbers. The actual lot size of each issue is in its RHP and on the IPO page.
Minimum application value
The minimum you can apply for is one lot at the cap price, because brokers block at the cap even if you bid lower or at cut-off. If the final price is fixed below the cap, the difference is released after allotment. Keep enough balance for the full cap amount when you approve the UPI mandate; if the block fails, the bid fails.
Maximum lots for a retail investor
A retail bid must not exceed ₹2 lakh, calculated at the cap price. To find the most lots you can apply for, divide ₹2,00,000 by the value of one lot and drop the decimal.
Worked example
Say an IPO has a price band of ₹100–105 and a lot of 142 shares. One lot at the cap is 142 × ₹105 = ₹14,910.
- Divide the retail limit by the lot value: ₹2,00,000 ÷ ₹14,910 = 13.41.
- Drop the decimal: the maximum is 13 lots.
- Check the amount: 13 × 142 = 1,846 shares, and 1,846 × ₹105 = ₹1,93,830, which is under ₹2 lakh.
- Fourteen lots would be ₹2,08,740, above the limit, so that bid belongs in the small NII category instead.
| Category | Lots in this example | Amount at cap |
|---|---|---|
| Retail minimum | 1 lot | ₹14,910 |
| Retail maximum | 13 lots | ₹1,93,830 |
| Small NII minimum | 14 lots | ₹2,08,740 |
| Big NII minimum | 68 lots | ₹10,13,880 |
Illustration only. Small NII bids are above ₹2 lakh and up to ₹10 lakh; big NII bids are above ₹10 lakh.
Does applying for more lots help?
In an oversubscribed retail category, allotment is a lottery for one lot per applicant. Thirteen lots and one lot have practically the same chance of winning that one lot. Applying for the maximum only keeps more money blocked for a few days. More lots matter mainly when the retail portion is not fully subscribed, because then everyone gets what they asked for. In the small and big NII categories the same idea applies, with the lottery run for the minimum application size of each.
SME IPOs: the two-lot minimum
SME IPOs, listed on BSE SME or NSE Emerge, have long had much larger lots than mainboard issues. Since 2025, the rules require a minimum application of two lots, with the application value above ₹2 lakh. In effect, every SME applicant now bids an HNI-sized ticket, and there is no small retail-style entry.
- Check the minimum amount before applying: it is usually well above ₹2 lakh.
- UPI works for applications up to ₹5 lakh; above that, use net-banking ASBA.
- Larger tickets, lower liquidity and wider price swings make SME IPOs riskier. Read the risk factors before deciding.
How this site shows the minimum
Each IPO page on this site shows the price band, the lot size and the minimum investment for one lot at the cap, along with the smallest application in each category, such as one lot for retail and the minimum small HNI and big HNI bids, with the amount in rupees. For SME issues the minimum is shown as two lots. For the retail maximum, use the division above. After you apply, "＋ I applied" lets you record how many lots you bid for each family member, and My IPOs follows the allotment and listing for each of them.
Common mistakes
- Calculating at the floor price. The ₹2 lakh retail limit and the amount blocked are both at the cap.
- Bidding 14 lots in the example above as retail. The app may move it to NII or reject it.
- Splitting money across many PANs in one family without each person having their own demat and bank account.
Frequently asked questions
What is the minimum investment in an IPO?
One lot multiplied by the upper end of the price band. For mainboard IPOs this is set at around ₹10,000–15,000; for SME IPOs the minimum is two lots and above ₹2 lakh.
How many lots can I apply for as a retail investor?
As many as fit within ₹2 lakh at the cap price. Divide ₹2,00,000 by the value of one lot and drop the decimal.
Why is the lot size such an odd number?
It is chosen so that one lot at the cap price falls within the minimum application range, so it depends entirely on the share price.
Can I apply for a fraction of a lot?
No. Bids must be in whole lots, and allotment is also made in whole lots.
Is the retail limit calculated at the final price or the cap?
At the cap price of the band, which is also the amount blocked when you bid.