Greenshoe Option: Definition & Meaning | Bondfish
A greenshoe option — formally an over-allotment option — is a clause in an offering agreement that lets underwriters sell up to about 15% more securities than originally planned, buying them from the issuer at the offering price, typically within 30 days of the deal.
How a greenshoe option works
In a new offering, the underwriting banks often allocate more securities to investors than the announced deal size — they “over-allot.” The greenshoe gives them the right to cover that extra allocation by buying additional securities from the issuer at the offering price instead of in the open market.
The clause doubles as a price-stabilization tool. If the new issue trades below the offering price, the bookrunner buys it back in the market, supporting the price, and lets the option lapse. If it trades above, the banks exercise the greenshoe and the issuer ends up selling a larger deal. The name comes from Green Shoe Manufacturing, the first company to include such a clause in an offering.
Why it matters for bond investors
Greenshoes are best known from stock IPOs, but over-allotment clauses also appear in some bond offering structures, convertibles, and exchange-listed retail bonds. For investors, the practical effects are twofold: the final deal size can end up larger than announced, and early trading is often steadier than it would otherwise be, because the stabilization bid cushions the first days or weeks after pricing.
Example
An issuer announces a $500 million deal with a 15% greenshoe. Underwriters allocate $575 million to investors. If demand stays strong, they exercise the option and the issuer sells $575 million in total. If the price sags, they buy back up to $75 million in the market — supporting the price — and the deal stays at $500 million.
Related terms
This definition is for general information only and is not investment advice. Bond investing involves risk, including possible loss of principal.