Overallotment Options Explainer
An overallotment option is a provision that lets underwriters purchase additional securities from the issuer or selling holders at the offering price, less the underwriting discount. It is often called a greenshoe and is commonly sized as a percentage of the base offering under the disclosed terms.
Underwriters may initially sell more securities than the base amount, creating a short position. If the market price is strong, they can exercise the option to obtain shares and close that position. If the price weakens, permitted open-market purchases may instead cover the short and can support orderly trading.
Exercise increases the final number sold and may increase issuer proceeds when the company supplies the extra shares. The prospectus describes the maximum amount, exercise period, source of securities, discount, and use. Actual practice depends on demand, trading, and regulation.
The option does not guarantee that the stock will stay at the offering price, and stabilization is limited and temporary. Investors should distinguish the base deal from the fully exercised case when comparing dilution, capitalization, fees, proceeds, and per-share data.
The option supplies shares sold beyond the base deal.
Terms specify size, price, source, and exercise period.
Underwriters may exercise the option or buy in the market.
Market conditions influence the choice.
Stabilization activity is regulated, limited, and temporary.
Offering-price support cannot remove investment risk.
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