D&O Insurance Glossary: Key Terms Defined

Why D&O Vocabulary Matters Before You Sign

Directors and officers insurance is one of the most misread commercial policies on the market. Business owners skim the declarations page, see a healthy limit, and assume they're protected. Then a shareholder derivative suit lands, or a regulatory investigation opens, and the coverage gaps become very real, very fast.

The reason gaps exist is almost always definitional. D&O policies are dense with terms of art — words like insured person, retention, wrongful act, and Side A carry precise legal and contractual meanings that differ from everyday usage. If you don't know what those terms mean, you can't evaluate whether a policy actually protects you.

This glossary cuts through that fog. It's organized to give you the working vocabulary you need to read a D&O policy, compare quotes, and have a productive conversation with your broker. For a broader overview of what the policy covers and excludes, see what D&O insurance actually covers.

Core Policy Structure Terms

Before diving into exclusions and triggers, you need to understand how a D&O policy is architecturally divided. Most modern D&O policies are split into three distinct coverage components — commonly called "sides" — and each one responds to a different scenario.

Side A, Side B, and Side C Coverage

Side A covers individual directors and officers directly when the company cannot or will not indemnify them. This is the coverage that protects a personal balance sheet — the executive's home, savings, and personal assets are on the line if this side is absent or eroded. Side A is typically subject to no retention (deductible) when it responds in a non-indemnifiable scenario.

Side B reimburses the company after it has already indemnified its directors and officers. The company absorbs the loss first, then the insurer repays it up to the applicable limit. A corporate retention applies here.

Side C (also called entity coverage) covers the corporate entity itself — most commonly invoked in securities claims when the company is named as a co-defendant alongside its officers. Not all D&O policies include Side C, and for private companies the entity coverage often extends beyond securities claims to broader wrongful acts.

Claims-Made vs. Occurrence Basis

D&O policies are written on a claims-made basis universally. Coverage applies to claims first made during the active policy period, not when the alleged wrongful act occurred. This is a fundamental departure from how general liability policies work, and it has major implications for policy continuity. If you let coverage lapse for even one day, claims that surface later — even for acts that happened years ago — may have no coverage home.

For a ground-level walkthrough of how these structural elements fit together, D&O Insurance From the Ground Up is a useful starting point.

Definitions of the 20 Terms You'll Encounter Most

Below are the terms that appear in virtually every D&O policy and underwriting application. Know these before you read a quote or negotiate renewals.

A Few Terms That Need More Than a One-Line Definition

Insured vs. Insured Exclusion: This exclusion bars coverage for claims brought by one insured against another insured — most commonly, a claim the company itself brings against one of its own executives. The intent is to prevent collusive claims. However, it can inadvertently extinguish coverage for legitimate derivative suits brought on behalf of shareholders, or for employment-related claims where the corporate entity is technically an insured. Many insurers now offer carve-backs for derivative demands, bankruptcy trustee actions, and certain employment claims. Always confirm what carve-backs your policy includes.

Wrongful Act: This defined term is the trigger for coverage. Narrow definitions that list only specific acts (misstatement, misleading statement, neglect) leave gaps. Broader definitions that include any actual or alleged breach of duty, neglect, error, omission, or misleading statement provide more durable protection. The difference is not cosmetic — it determines whether a regulatory investigation triggered by an ambiguous management decision is covered.

Loss: Not everything that costs money qualifies as a covered "loss" under a D&O policy. Most policies exclude fines, penalties, punitive damages, and restitutionary amounts from the definition of loss. The practical consequence: if a court orders disgorgement of profits, that amount is almost certainly not covered, even if the underlying defense costs were. See key exclusions buried in D&O policies for a full accounting of what typically falls outside coverage.

Retention: D&O retentions work differently depending on the policy side. Side A typically carries no retention for non-indemnifiable losses. Side B and Side C carry corporate retentions that can range from $25,000 for a small private company to several million dollars for a publicly traded firm. A higher retention reduces premium but means the company absorbs more out-of-pocket before coverage kicks in. Do not confuse retention with a deductible — some policy forms hold the individual insured responsible for paying the retention, which is a materially worse outcome.

Policy Mechanics: Retroactive Dates, Reporting Periods, and Limits

Beyond definitions of who and what is covered, D&O policies contain operational mechanics that determine when coverage applies and how much money is available. These provisions are frequently misunderstood and frequently litigated.

Retroactive Date

The retroactive date — sometimes called the prior acts date — sets the earliest date from which wrongful acts can give rise to a covered claim. Any wrongful act occurring before this date is excluded, regardless of when the claim is made. If your policy has a retroactive date of January 1, 2020, and a claim alleges misconduct from 2018, you have no coverage for that alleged act.

When purchasing a new D&O policy or switching insurers, always negotiate for the earliest possible retroactive date — ideally the company's founding date. Insurers will sometimes push for a more recent date, especially if the prior carrier had losses. Understand exactly what date your policy specifies and what historical exposure it leaves uncovered.

Extended Reporting Period (ERP)

Also called a "tail," an extended reporting period allows claims to be reported to the insurer after the policy has expired or been cancelled, provided the underlying wrongful act occurred before policy expiration. ERPs are critical in several scenarios: a company being acquired, a company going out of business, or an executive departing who wants continued protection for their tenure.

ERPs are typically available for 1, 2, or 3 years, and sometimes up to 6 years. They come at an additional premium — commonly 100–200% of the final annual premium for a 3-year tail. Many D&O policies include a free 60-day automatic ERP as a baseline; that is almost never sufficient for a genuine wind-down or acquisition scenario.

Aggregate vs. Per-Claim Limits

Most D&O policies are written with an aggregate limit — the maximum the insurer will pay across all claims during the policy period combined. This is not a per-claim limit. If your company faces two simultaneous lawsuits and the aggregate limit is $5 million, both claims draw from the same pool. In securities litigation, defense costs alone can consume millions before a case resolves. Understand your limit structure before assuming it's adequate.

Some policies offer sublimits for specific coverage grants — Side A coverage may have a dedicated sublimit, or the policy may carve out a separate limit for investigation costs. These sublimits can be a valuable protection or a hidden constraint, depending on how they're structured. For a deeper dive into how limits interact with exclusions, Policy Limits & Exclusions is a useful reference.

Exclusions Vocabulary: What the Policy Won't Pay

Every D&O policy contains exclusions. Some are standard across the industry; others are carrier-specific and negotiable. Knowing the vocabulary is the first step to knowing what to push back on.

The Most Consequential Standard Exclusions

Fraud / Dishonesty Exclusion: Excludes losses arising from deliberate fraudulent acts or criminal conduct. Critically, most policies specify that this exclusion applies only after a final adjudication — meaning the insurer must continue to advance defense costs until fraud is proven in court. Policies that allow the insurer to cease advancing costs based on mere allegations are substantially weaker. Read the exclusion trigger carefully: "alleged" vs. "established by final adjudication" is not a trivial distinction.

Personal Profit / Illegal Remuneration Exclusion: Excludes coverage for gains to which an insured was not legally entitled. Again, the final adjudication standard matters here. An insurer that can invoke this exclusion based on a regulatory accusation — not a court judgment — can strand an executive without defense funding at exactly the moment they need it most.

Prior Knowledge / Prior Acts Exclusion: Excludes claims arising from wrongful acts that a specified executive knew about before the policy incepted. This exclusion is typically activated by a warranty or application representation made at the time of binding. Underwriting applications ask whether any director or officer is aware of circumstances that could reasonably give rise to a claim. Answering incorrectly — even unintentionally — can void coverage entirely under the severability provisions.

Bodily Injury / Property Damage Exclusion: D&O is a management liability product, not a general liability product. Physical injury or property damage claims belong in a CGL policy, not D&O. This exclusion is standard and non-negotiable, but it's worth understanding because plaintiffs sometimes try to characterize management decisions as having caused physical harm.

The interplay between exclusions and the insuring agreement is one of the most litigated areas in commercial insurance. For a systematic review, Key Exclusions Buried in D&O Policies walks through the most common policy gaps in detail.

Using This Glossary in Practice

A glossary is only useful if it changes behavior. Here's how to put these definitions to work immediately.

During the Application Process

Underwriting applications for D&O are legal documents. Every answer to a question about prior claims, pending investigations, or known circumstances is a warranty. Misrepresentations — even innocent ones — can provide the insurer grounds to rescind the policy when a claim arises. Understand the definitions in the application itself: "claim," "circumstance," and "wrongful act" often have specific meanings in that context. Underwriting Basics explains how insurers use application information to assess and price risk.

When Comparing Quotes

Premium is the least useful number on a quote comparison sheet. The useful numbers are: the definition of wrongful act, the final adjudication standard on the fraud exclusion, the Side A retention (or lack thereof), the retroactive date, the aggregate limit structure, and whether any Side A dedicated limit exists. Two policies with the same premium can have vastly different risk profiles based on those variables alone.

When a Claim Arises

Notice provisions in D&O policies are strict. Most policies require notice "as soon as practicable" or within a defined number of days after an insured first becomes aware of a claim or circumstance. Delayed notice can — and does — result in coverage denials. If you receive a shareholder demand letter, a subpoena, a regulatory inquiry, or even a credible written threat of litigation, consult your broker immediately about reporting obligations. Do not wait to see whether it "becomes a real claim."

For the full picture of D&O coverage, structure, and cost — including how these terms operate across the entire policy lifecycle — The Full D&O Insurance Landscape covers each stage end to end.