New Delhi: The government’s decision to sell an additional 3 per cent stake in Hindustan Copper has brought an unusual capital-market term into focus — the “green shoe option”.

The government had initially planned to sell a 3 per cent stake through an Offer for Sale (OFS). Strong institutional demand, with bids reaching 3.41 times the shares offered, prompted it to exercise the entire additional 3 per cent option, potentially taking the total sale to nearly ₹3,000 crore.

However, calling this a green shoe option is not technically accurate in the traditional capital-market sense.

What is a green shoe option?

A genuine green shoe option is a mechanism used during an Initial Public Offering (IPO) to help stabilise a newly listed company’s share price.

Under Securities and Exchange Board of India (SEBI) regulations, a company can provide for an over-allotment of shares, generally up to 15 per cent of the original issue size. A lead manager is appointed as a stabilising agent and borrows additional shares from existing shareholders.

The extra shares are sold as part of the IPO. If the share price subsequently falls, the stabilising agent can use the money raised to buy shares from the market, creating additional demand and potentially limiting a sharp decline.

How the price-support mechanism works

Consider an IPO offering 100 shares at ₹100 each. With a green shoe option, up to 15 additional shares could be made available.

If the stock falls after listing, the stabilising agent can purchase some of those shares from the market and return them to the shareholder from whom they were borrowed.

If the agent cannot purchase all the borrowed shares during the stabilisation period, the company can issue new shares equivalent to the shortfall to the original shareholder.

The stabilisation mechanism can operate for up to 30 days.

The key purpose is therefore post-listing price stabilisation, rather than simply allowing a seller to dispose of additional shares when demand is strong.

Why Hindustan Copper is different

Hindustan Copper has already been listed for decades. The government is not launching an IPO or creating a mechanism to support the company’s share price after listing.

There is no stabilising agent borrowing shares from the government, nor is there a 30-day price-support arrangement.

Instead, the government is selling more of its existing stake because institutional demand for the OFS was strong.

The additional sale also comes as the government works towards its FY27 disinvestment target of ₹80,000 crore. It has reportedly raised around ₹52,700 crore so far this financial year.

Why the distinction matters

The difference is more than just terminology. A genuine green shoe option is designed to manage volatility in a newly listed company’s shares, while the Hindustan Copper transaction simply allows the government to sell additional shares in response to strong demand.

The term “green shoe” originated from Green Shoe Manufacturing Company, which used an over-allotment arrangement when it went public in the US in 1963. The company, later known as Stride Rite Corporation, helped popularise the mechanism that eventually became known as the greenshoe option.

Hindustan Copper’s strong financial performance may have contributed to investor interest. In Q1 FY27, its net profit reportedly rose 163 per cent year-on-year to ₹353 crore, while revenue increased 81 per cent to ₹936 crore.

For investors, the lesson is simple: when the term “green shoe” appears in a share sale, it is worth checking whether it refers to the formal IPO price-stabilisation mechanism or is simply being used to describe an additional allocation of shares.