Origin of the Green Shoe Option
The term "green shoe option" originates from the first company to use this mechanism — Green Shoe Manufacturing Company in the United States, now known as Stride Rite Corporation. The US SEC approved this option in 1963, and it has since become a standard tool in global IPOs. In India, SEBI permits green shoe options under its ICDR Regulations.
What is the Green Shoe Option?
The green shoe option — officially called the over-allotment option in SEBI regulations — is a mechanism that allows the underwriters (BRLMs) of an IPO to issue up to 15% more shares than originally planned, if demand exceeds supply. These extra shares are borrowed from an existing shareholder (typically a promoter or pre-IPO investor who agrees to lend them).
This creates a stabilization fund that the designated stabilizing agent (DSA) uses to support the stock price in the post-listing period.
How It Works: Step by Step
- Over-allotment at IPO: If the IPO is heavily oversubscribed, the DSA allots up to 15% more shares than the base issue size. These extra shares are borrowed from a large shareholder under the green shoe arrangement.
- Listing and stabilization window: After listing, the DSA has 30 days to operate the stabilization mechanism. During this window, the DSA can buy shares from the open market to support the stock price.
- Two scenarios post-listing:
- If stock price falls below issue price: The DSA uses the IPO proceeds from over-allotment to buy shares from the market, supporting the price. These purchased shares are used to return the borrowed shares.
- If stock price rises above issue price: The DSA exercises the option to get fresh shares from the company (or promoter) at the issue price, which are used to return the borrowed shares. The DSA does not buy from the market in this case.
- Stabilization window closes: After 30 days, any unused stabilization fund money goes to the Investor Protection and Education Fund (IPEF) managed by SEBI.
Why Does the Green Shoe Option Help Investors?
For retail IPO investors, the green shoe option provides a safety net:
- It reduces the probability of a steep listing-day price crash
- It creates a guaranteed buyer (the DSA) if the stock falls below issue price in the first 30 days
- It allows institutional investors to invest with more confidence in volatile listing conditions
Not all IPOs include a green shoe option. When one is included, it is always disclosed in the RHP under the "Stabilisation Mechanism" section, along with the name of the stabilizing agent and the maximum over-allotment quantity.
Notable Indian IPOs With Green Shoe Options
- Infosys (used green shoe in US ADR listing)
- Several recent mainboard IPOs including banking and NBFC IPOs
- LIC IPO (2022) had a green shoe stabilization mechanism given its massive size
Limitations of the Green Shoe Option
- Limited to 15% of issue size — cannot prevent a major crash if fundamentals are bad
- 30-day window is short — selling pressure after 30 days can still be severe
- The stabilization mechanism is a price support tool, not a valuation guarantee
Key Takeaways
- Green shoe option lets underwriters issue up to 15% extra shares and use proceeds to stabilize post-listing price
- It protects investors against immediate listing crashes by creating a guaranteed buyer
- Only effective for 30 days post-listing
- Check the IPO's RHP to see if a green shoe option has been included
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