What Is Firm Commitment Underwriting?
In a firm commitment deal, the underwriters become principals: they purchase every share or bond in the offering from the issuer and then resell the securities to investors at the public offering price. The issuer's proceeds are locked in the moment the deal prices, and any shortfall in investor demand becomes the banks' problem rather than the company's.
The main alternative is a best-efforts arrangement, where the bank acts only as an agent, selling what it can while the issuer keeps the risk of an undersold deal. Firm commitment dominates registered offerings by established companies, while best-efforts structures appear mostly in smaller or more speculative placements where banks decline to put their capital at risk.
How the Economics Work
The underwriters earn the gross spread, the gap between what investors pay and what the issuer receives. If a company sells 10 million shares at a $20 offering price with a 7% spread, the banks pay the issuer $18.60 per share, or $186 million, and aim to collect $200 million from investors, keeping the $14 million difference as compensation for distribution and risk.
The risk window is deliberately short. Underwriters build the order book before pricing and commit only once demand is known, and tools like oversubscription and the greenshoe option cushion the aftermarket. Losses still happen when a deal breaks issue price and stabilization fails. The extreme version is the bought deal, common in follow-on offerings, where a bank buys a block outright with little or even zero marketing beforehand.
Why Firm Commitment Matters
For issuers, the structure delivers certainty of proceeds during the single most important financing event many companies ever undertake, and the underwriters' willingness to commit capital acts as a credibility signal to investors. For the banks, having their own money at stake sharpens the incentive to judge demand accurately and price the deal where it will hold.
The concept anchors how equity capital markets desks think about risk and reward, since the spread compensates banks for a genuine, if brief, principal exposure. In interviews, being able to explain the gross spread mechanics with real numbers, and to distinguish firm commitment from best-efforts arrangements, demonstrates a solid grasp of how offerings move from issuer to investor.
