Minimum public offer rules: what changed for large startup IPOs

The minimum public offer, or MPO, is the smallest slice of a company that must be offered to the public in an IPO. For most companies it is 25% of the post-IPO capital. Very large companies are allowed to offer less, since a 25% sale of a giant would be too big for the market to absorb.

The rule sits in Rule 19 of the Securities Contracts (Regulation) Rules, 1957 (SCRR), which the Ministry of Finance can amend. A related rule, the minimum public shareholding (MPS), requires every listed company to have at least 25% of its shares in public hands, within a set time after listing.

The timeline matters, so the dates are listed carefully. SEBI published a consultation paper on 18 August 2025. Its board backed lower MPO tiers on 12 September 2025, and it sent the proposal to the Ministry of Finance. The ministry notified the Securities Contracts (Regulation) Amendment Rules, 2026 on 13 March 2026, according to law-firm notes.

So the proposal came in 2025, but the law changed in 2026. Sources do not give a clear start date beyond "commencement", so check the gazette notification. SEBI also issued a circular on 7 April 2026 giving a one-time relaxation to listed companies whose MPS deadline fell between 1 April and 30 September 2026.

The table below follows a Trilegal summary of the amended rules, as of November 2026. MPO here refers to the post-issue market capitalisation of the company.

• Up to ₹1,600 crore: 25% of post-issue capital, unchanged.
• ₹1,600 crore to ₹4,000 crore: an offer of ₹400 crore, unchanged.
• ₹4,000 crore to ₹50,000 crore: 10% of post-issue capital, unchanged.
• ₹50,000 crore to ₹1 lakh crore: ₹1,000 crore plus at least 8%.
• ₹1 lakh crore to ₹5 lakh crore: ₹6,250 crore plus at least 2.75%.
• Above ₹5 lakh crore: ₹15,000 crore plus at least 1%, with at least 2.5% of post-issue capital offered to the public.

The tiers work on the market value of the company after the IPO, not on the issue price or the amount raised. A company valued at ₹60,000 crore after listing falls in the ₹50,000 to ₹1 lakh crore tier, even if it raises only a fraction of that amount.

In the higher tiers, two conditions are joined by "and": a rupee amount and a percentage. The company must meet both, so the larger figure decides the minimum. Tiers use post-issue market capitalisation as stated in the offer document, so the final price band can move a company from one tier to the next. Sources give slightly different readings of some cells, so use the gazette table for any calculation.

A company that offers less than 25% at IPO must raise its public shareholding to 25% later. The time allowed depends on size. Companies up to ₹50,000 crore keep the 3-year period. Those between ₹50,000 crore and ₹1 lakh crore get 5 years from listing.

For companies above ₹1 lakh crore, the summary says that if public shareholding at listing is 15% or more, 25% is due within 5 years. If it is below 15%, the company must reach 15% within 5 years and 25% within 10 years. The earlier rules gave the middle tier 3 years, per a September 2025 law-firm note.

Few startups reach the top tiers. Most Indian startup IPOs list at a valuation below ₹50,000 crore, where the rules did not change. The relief matters for the biggest names, in particular any company valued above ₹50,000 crore at listing.

Where it does apply, the benefit is simple: the company and its early investors sell a smaller slice at the start, which means less dilution for founders and a smaller order for the market to digest. The cost is a thinner public float for a longer time, which can make the share price move more.

A 25% float of a very large company would run to tens of thousands of crores, and India's market has rarely absorbed an offer of that size. SEBI's consultation paper looked at trends in IPO size over five years and at how much public shareholding recently listed large companies held. It then proposed a sliding scale so that big issuers could list without being forced to sell more than the market could take.

The 2.5% floor for the largest tier is a safeguard: even the very largest issuer must put a meaningful share of its equity on offer.

The two rules are often mixed up. The MPO is a one-time test at the IPO: how much is offered. The MPS is an ongoing duty: what share of the company must be in public hands, and by when. A company can pass the first test with a small offer and then have years to build up the second.

The MPS is usually met by later sales, for example promoters or early investors selling shares in follow-on offers or block deals, or by the company issuing new shares. If a company misses the deadline, stock exchanges can take action, which is why SEBI's April 2026 circular on a one-time relaxation drew attention.

A headline that says a company will "sell just 2%" or "float ₹5,000 crore" is describing its MPO. Compare the figure with the tier table, and look at the MPS timeline in the prospectus.

Also keep the difference between the MPO and the fresh issue in mind. The MPO is the total offered, and it can be a mix of new shares and shares sold by existing investors, as the offer-for-sale versus fresh-issue guide explains. This guide is general information, not legal advice, so check the gazette text for specific cases.