Defining Public Companies: Key Features and Legal Requirements

Every company you can buy shares of on the stock market, from a fintech startup that went public last year to a decades-old manufacturing giant, falls into one specific legal category: the public company. This is not a marketing label. It is a formal definition under the Companies Act, 2013, and it comes with a distinct set of rights, obligations, and compliance burdens. Understanding what actually makes a company “public” in the eyes of the law is one of the first building blocks in company law, and it sets up almost everything else you will study about corporate governance later.

What the law means by a public company 🔗

Section 2(71) of the Companies Act, 2013 defines a public company mainly in the negative: it is any company that is not a private company. That single line does a lot of work, because it means a public company is free of the restrictions that private companies operate under, such as capped membership and limits on share transfer.

The original version of Section 2(71) also required a minimum paid-up share capital of five lakh rupees. That requirement was dropped by an amendment effective 2015, so today a public company does not need to meet any minimum capital threshold to be classified as one, though promoters still decide on a practical capital base depending on the scale of the business, as explained in this comparison of private and public companies.

There is also an important extension to this definition. If a private company is a subsidiary of a public company, it is treated as a deemed public company under the law, even if its own articles still describe it as private. This prevents large public companies from using private subsidiaries to sidestep public company obligations.

How many people does it take to form one 🔗

Minimum seven, no upper limit 🔗

Under Section 3(1)(a) of the Act, a public company can be formed by seven or more persons for any lawful purpose, and there is no cap on how many members it can eventually have. This is one of the clearest structural differences from a private company, which needs only two members but cannot exceed two hundred members. The uncapped membership is what allows public companies to have thousands, sometimes millions, of shareholders once they list on a stock exchange.

A public company also needs a minimum of three directors on its board, compared to just two for a private company, reflecting the wider base of stakeholders it answers to.

What happens if membership drops below the minimum 🔗

The law does not just set a floor at incorporation and forget about it. Section 3A makes it clear that if a public company’s membership falls below seven and the company keeps operating for more than six months in that state, every member who knowingly continues the business during that period can be held personally and severally liable for the company’s debts incurred in that window. A recent enforcement action against a company that briefly dropped to six members, reported by a corporate compliance tracker, shows regulators do act on this provision rather than treating it as a formality.

The power to raise money from the public 🔗

The single biggest practical advantage of being a public company is the ability to invite the general public to subscribe for its shares or debentures. It does this through a prospectus, defined under Section 2(70) as any document or notice inviting the public to subscribe for or purchase a company’s securities. A private company is legally barred from issuing a prospectus or making any such invitation, which is why startups that want to raise money from retail investors eventually have to convert into a public company structure.

This is also why public companies must add the word Limited at the end of their name if their liability is capped, so that anyone dealing with the company, including potential investors, immediately knows its legal status.

Three types of public companies based on liability 🔗

Not every public company works the same way when it comes to what members owe if the company runs into trouble. The Act recognises three structures, and a public company can technically be any of them, though the vast majority are companies limited by shares.

The definitions of these categories come from Sections 2(22), 2(21), and 2(92) of the Act respectively, and a helpful breakdown of how each structure actually functions is available in this overview of company classifications. It is worth noting that this liability classification and the private-or-public classification are independent of each other: a company limited by guarantee can technically be private or public depending on membership rules, though in practice guarantee companies are usually structured for non-profit work rather than raising public capital.

Why public companies face tighter regulation 🔗

Because a public company can hold money belonging to thousands of outside investors who have no direct say in daily operations, the law compensates with heavier oversight. This shows up in a few concrete ways.

Board composition and governance 🔗

Public companies must maintain a minimum of three directors, and larger or listed public companies must additionally appoint independent directors and constitute board committees such as an audit committee, as detailed in academic analysis of company classification requirements under the 2013 Act. These structures are designed to insert a layer of independent scrutiny between company management and the shareholders whose money is at stake.

Disclosure obligations once a company is listed 🔗

The moment a public company lists its shares on a stock exchange, it also comes under the SEBI Listing Obligations and Disclosure Requirements Regulations. These require regular disclosure of financial results, material corporate events, shareholding patterns, and related party transactions, along with mandatory independent director representation and functioning audit committees. This layered system, Companies Act on one side and SEBI regulations on the other, is what gives public shareholders enough visibility to make informed investment decisions, something a private company’s closely held members do not typically need.

Public company versus private company at a glance 🔗

This table captures why the two categories are treated so differently under the law. A private company is built for a small, closely connected group of people who can regulate themselves through private agreement. A public company is built to hold capital contributed by strangers, and the law steps in to protect those strangers through structure and disclosure rather than personal trust.

What do you think? 🔗

What do you think? If you were advising a fast-growing startup on whether to convert from a private to a public company, would you weigh the ability to raise public capital more heavily than the extra compliance burden that comes with it? And do you think the removal of the minimum paid-up capital requirement in 2015 made it too easy for undercapitalised companies to claim public company status?

References

1. https://www.indiacode.nic.in/bitstream/123456789/2114/5/A2013-18.pdf
2. https://lawbhoomi.com/difference-between-private-and-public-company-under-companies-act-2013/
3. https://www.compliancecalendar.in/learn/penalty-to-public-company-for-reducing-number-of-members-from-seven-to-six-after-share-transfer
4. https://www.companiesnext.com/blog/types-and-classification-of-companies-under-the-companies-act-2013
5. https://www.ijlra.com/details/types-of-companies-under-the-companies-act-2013-by-dhobale-sanket-narayan
6. https://www.sebi.gov.in/legal/regulations/jul-2022/securities-and-exchange-board-of-india-listing-obligations-and-disclosure-requirements-regulations-2015-last-amended-on-july-25-2022-_61405.html