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Underwriting

Underwriting is the process of evaluating risk and deciding whether, and on what terms, to accept it, most often in insurance or in bringing new securities to market.

What Is Underwriting?

Underwriting is the work of examining a risk or an offering closely enough to decide whether to take it on and at what price. The term is used in two main areas of finance. In insurance, an underwriter reviews an applicant and decides whether to issue a policy and what premium to charge. In capital markets, an investment bank acting as an underwriter helps a company issue new securities, such as shares or bonds, to investors.

How Insurance Underwriting Works

Insurers collect information about an applicant, such as health history, driving record, property condition, or business operations, and compare it against the company's guidelines and loss data. The underwriter then chooses one of several outcomes: approve the policy at standard rates, approve it with higher rates or special conditions, or decline it. Good underwriting keeps the pool of insured risks balanced so that premiums are expected to cover claims and expenses. Poor underwriting can lead to losses, which is why insurers rely on statistical models and experienced staff.

How Securities Underwriting Works

When a company sells new securities through an initial public offering or a secondary offering, one or more banks typically buy the shares from the issuer and resell them to investors. In a firm commitment arrangement, the banks take on the risk of unsold shares. Their compensation comes from the difference between the price they pay the issuer and the price at which the public buys. Underwriters also research the company, help set the offering price, and prepare disclosure documents.

Why It Matters to Investors

For individual investors, underwriting is a useful lens on who is taking risk and how that risk is priced. In insurance, underwriting standards affect how much coverage costs and whether an insurer remains financially stable. In securities, the quality of an underwriter's due diligence and the terms of an offering can affect how new shares perform after they begin trading. Underwriting does not guarantee any outcome, and investors can review an offering's prospectus and an insurer's financial strength ratings to learn more.

Updated October 15, 2026. For general education only; not financial, tax or legal advice.

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Related Terms

Premium

A premium is an amount paid above a base value, such as the regular payment for insurance coverage, the price of an option contract, or a price above a bond's par value.

Investment Bank (IB)

An investment bank is a financial firm that helps companies, governments and other organizations raise capital, advises on major deals, and trades securities for clients and for its own account.

Security

A security is a tradable financial instrument that represents an ownership stake, a creditor relationship, or the right to buy or sell an ownership interest.

Initial Public Offering (IPO)

An initial public offering (IPO) is the first sale of a company's shares to the public, after which the shares trade on a stock exchange.

Insurance Premium

An insurance premium is the amount a policyholder pays, usually on a regular schedule, to keep an insurance policy in force and receive its coverage.

Prospectus

A prospectus is a formal legal document that a company or fund issues to describe a securities offering, including its business, finances, risks, and terms, so investors can make informed decisions.

Due Diligence

Due diligence is the investigation and verification a person or firm performs before committing to a transaction, such as buying a company's shares or acquiring a business, to confirm facts and identify risks.