Greenshoe Option

A provision in an underwriting agreement that allows underwriters to sell more shares than originally planned to stabilize prices.

A greenshoe option, legally known as an over-allotment option, is a clause contained in an underwriting agreement for an initial public offering (IPO) or secondary offering. It grants the underwriting syndicate the right to sell up to 15% more shares than originally planned at the offering price. This option is typically active for 30 days after the offering begins and serves as a vital price-stabilization mechanism. To understand how it is observed, consider the two paths the underwriters can take based on market demand. If demand is exceptionally high and the stock price rises above the IPO price, the underwriters exercise the greenshoe option to buy the extra shares from the issuing company at the original offering price, allowing them to cover their short positions and pocket the underwriting spread. If the stock price falls below the IPO price, the underwriters do not exercise the option; instead, they buy back shares directly from the open market, which creates buying pressure to support the falling stock price. For retail investors, the presence of a greenshoe option is generally positive because it reduces extreme volatility during the initial trading days of a new security. It ensures a more orderly market and provides a temporary safety net against immediate post-IPO sell-offs. However, investors should remember that this price support is temporary, lasting only up to 30 days, after which the stock must find its natural market value without underwriter intervention.

Company A plans to go public by issuing 10 million shares at an IPO price of $20 per share, raising $200 million. The underwriting agreement includes a 15% greenshoe option, allowing underwriters to sell an additional 1.5 million shares. Due to high demand, the underwriters sell 11.5 million shares to the public at $20. If the stock price rises to $25, the underwriters exercise the option to buy the 1.5 million shares from Company A at $20 to cover their short position, increasing the total capital raised by the company to $230 million.