What Is Underwriting?
In capital markets, underwriting is the service investment banks provide when a company issues stocks or bonds: the banks commit to buying the securities from the issuer and reselling them to investors. By standing between issuer and market, the underwriters absorb the risk that the deal cannot be sold at the expected price.
The word also describes risk assessment in insurance and lending, where an underwriter decides whether to take on a policy or loan and at what price. In an investment banking context, though, underwriting almost always refers to securities offerings such as IPOs, follow-ons, and bond issues.
Firm Commitment vs. Best Efforts
In a firm commitment underwriting, the standard for large deals, the banks purchase the entire offering from the issuer at a discount and resell it, so any unsold securities sit on the banks' books at a loss. In a best efforts deal, the banks simply agree to sell as much as they can, and the issuer bears the risk of a shortfall.
Because firm commitments put the banks' capital at risk, large offerings are shared among a syndicate of underwriters led by one or more bookrunners. The syndicate structure spreads risk and widens the pool of investors the deal reaches.
The Economics: The Gross Spread
Underwriters are paid through the gross spread, the difference between the price they pay the issuer and the price investors pay. In US IPOs the spread is famously around 7% for mid-sized deals, so on a 500 million dollar offering the syndicate would earn roughly 35 million dollars, while very large deals negotiate spreads down to 2 to 4%.
The spread is split into a management fee for arranging the deal, an underwriting fee for bearing risk, and a selling concession for placing shares, with the largest share going to the bookrunners. Interviewers sometimes ask how equity capital markets bankers make money, and explaining the gross spread cleanly is exactly the expected answer.
What Underwriters Actually Do
Beyond committing capital, underwriters perform due diligence on the issuer, help draft the prospectus, position the equity story, and set the valuation range. During marketing they organize the roadshow, build the order book, and advise on final pricing and allocation.
After pricing, the lead banks support the stock through stabilization activity, often using a greenshoe option, and their research analysts typically begin coverage after a quiet period. This full life cycle is why issuers care so much about choosing underwriters with strong distribution and credible research.
