The mental model

Lloyd's is a market, not a carrier. The "carriers" inside Lloyd's are syndicates, which are not legal entities themselves but pools of capital backed by Members and managed on a year-of-account basis by managing agents. Around the Lloyd's market sits the company market: actual insurance companies that write some of the same business, often for the same brokers. Together, Lloyd's plus the London-domiciled company market is "the London Market."

The most useful initial reframe: in the US admitted market, a buyer goes to a carrier, gets a policy, and the carrier is the only thing on the contract. In the London Market, a buyer (almost always through a broker) goes to a marketplace, builds a placement that may include 5, 10, or 30 different syndicates and companies each taking a percentage of the risk, and ends up with one slip that all the underwriters have signed. The risk is subscribed across multiple capital providers, and each one is liable severally (each for its own share, not for the others). That single insight, the subscription market, explains most of what looks unfamiliar from the outside.

Society, Council, Corporation

Lloyd's has three governance bodies, each with a distinct role. New entrants confuse them constantly, so it is worth being precise.

What the Corporation does

The Corporation is what most people are interacting with when they "deal with Lloyd's" in any operational sense. It maintains the international license network (Lloyd's holds licenses or trading rights in over 200 territories), manages the Central Fund (the capital backstop that protects policyholders if a Member's own funds run out), oversees the performance management of syndicates, and runs the IT and market infrastructure. It does not write insurance. The syndicates do.

Regulation

Lloyd's is regulated by the UK Prudential Regulation Authority (PRA) and the Financial Conduct Authority (FCA). The Corporation has its own internal performance management role (the PMD, Performance Management Directorate) which approves syndicate business plans annually. Approval of business plans is the most consequential lever the Corporation pulls on individual syndicates. A syndicate that wants to enter a new line, expand a class, or change its risk profile must get the change approved through the business plan process.

Members, syndicates, managing agents

Three roles, often confused.

Members

Members are the capital providers. Historically, individuals with unlimited liability ("Names"). Today, almost entirely corporate Members backed by limited liability vehicles (typically corporate or trust structures), as well as a smaller number of unlimited individual Names still on legacy syndicates. A Member's capital supports one or more syndicates for a specific year of account in exchange for a share of the underwriting result.

Syndicates

A syndicate is a year-of-account underwriting pool. Each syndicate has a number (e.g., "Syndicate 33") and a managing agent that runs it. A syndicate writes business through the year, then closes the underwriting year three calendar years later via a process called Reinsurance to Close (RITC), where the open liabilities are transferred to a successor year for value. The closure mechanism is what allows Members to enter and exit the market on a year-of-account basis without having to wait decades for long-tail liabilities to run off.

Managing agents

Managing agents are FCA/PRA-authorized entities that manage one or more syndicates on behalf of Members. The managing agent employs the underwriters, claims staff, and operations team. The managing agent makes the underwriting decisions. The Members provide the capital and bear the underwriting result.

Members' agents

Less prominent today than they were when individual Names dominated, but still relevant. A Members' agent advises a Member on which syndicates to support. For a corporate Member with internal expertise, this role is often handled in-house. For an individual Name, the Members' agent remains a meaningful counterparty.

The subscription market

The single feature of Lloyd's that explains the most about how it works is the subscription market. A risk that is too large for any single underwriter to carry is broken into shares (lines), and each underwriter takes a percentage. The lead underwriter sets the terms. Following underwriters subscribe at the same terms.

The lead, the second, and the followers

On a typical Lloyd's slip:

• The lead underwriter is the first to write the risk, sets the terms (rate, deductible, exclusions, conditions), and is the principal point of contact for the broker on the placement. The lead's signature is the most important on the slip.
• The second slip is sometimes called out separately on large or complex risks, especially where the second carrier has a meaningful voice in pricing and conditions. Common in property treaty, energy, and large casualty placements.
• The following market takes a share at the lead's terms, usually with limited input on conditions. Following underwriters rely on the lead's analysis but still must sign their own line.

Slips and stamps

An underwriter signs the slip with a "scratch" (the underwriter's initials and the percentage line they are taking) and a syndicate stamp. The total of the lines signed is the placement order. Most placements aim for slightly more than 100% (a small over-placement) so that the broker can cut back proportionally to a clean 100% before binding.

Several liability

Each subscribing underwriter is liable severally, not jointly, for its own share. If Syndicate A signs 10% of a $100M layer, Syndicate A is on for $10M and only $10M, regardless of what other syndicates pay or fail to pay. The slip will contain a several liability clause to make this explicit. This is the structural feature that makes the subscription market work: each underwriter's downside is bounded and known.

The slip and the placement

The slip is the document that the broker takes around the market and that underwriters sign. Historically a literal piece of paper folded in a particular way. Today usually electronic (PPL, the Placing Platform Limited), though paper still exists for some classes and some negotiations.

What is on a slip

The slip contains the key contract terms: the insured, the period, the limits and deductibles, the territory, the perils, the named exclusions, the conditions, the choice of law and dispute resolution, the brokerage commission, the premium. It also contains the security details: which syndicates and companies are signing, at what percentage, with what authority. A typical slip runs 10-30 pages depending on complexity.

Endorsements

Mid-term changes to the slip are made by endorsement, signed by the leader (or the leader plus a defined following majority, depending on the slip's "endorsement clause"). Endorsements that bind the followers without their direct signature are called "non-cumulative" or "GUA" endorsements depending on the wording. The exact mechanics are governed by the General Underwriters Agreement (GUA), which has been the standard endorsement-handling protocol for decades.

The Market Reform Contract

The Market Reform Contract (MRC) is the standardized slip format introduced as part of the Market Reform initiative. It defines a standard set of headings (Risk Details, Information, Security Details, Subscription Agreement, Fiscal and Regulatory) and is now the dominant format for new placements. It is what an MRC slip looks like today, after the v3 reforms.

Lineslips and binders

Two related mechanisms for delegating underwriting. They look similar from outside the market and are very different inside it.

Lineslip

A lineslip is a Lloyd's-specific facility where a lead syndicate writes a class of business on agreed terms and following syndicates pre-commit to subscribing to risks bound under the facility, up to specified limits. Each individual risk is still written on its own slip; the lineslip just pre-arranges the security. Used for small-to-mid-sized risks where finding fresh capacity for each placement would be inefficient.

Binder (binding authority)

A binder, or binding authority, is a delegated underwriting agreement under which a coverholder (often an MGA, see Chapter 10) is given authority to bind risks directly on behalf of one or more syndicates within agreed parameters (class of business, geographic scope, limit, premium thresholds, exclusions). The coverholder, not the underwriter, is the one binding individual risks day to day. The underwriter receives bordereaux reports of bound business after the fact.

The difference that matters

• Lineslip: the broker still presents each risk to the lead underwriter, who endorses it in. Decision sits with the lead.
• Binder: the coverholder binds the risk on its own authority. Decision sits with the coverholder, within the parameters of the binder.

The two mechanisms are sometimes combined ("binder under a lineslip") for delegated authority across multiple following syndicates. This is one of the structures where exact reading of the contract matters most.

Coverholders and bordereaux

A coverholder is an entity (typically an MGA, retail agent, or specialist intermediary) authorized by Lloyd's to bind risks on behalf of one or more syndicates under a binder. Lloyd's maintains an approved coverholder register and conducts due diligence on coverholders before approval. There are roughly 4,000 active coverholders worldwide, distributing Lloyd's paper across geographies and classes that London-based underwriters cannot reach directly.

Why coverholders matter

The coverholder model is how Lloyd's reaches markets that need local distribution: small commercial accounts in regional US markets, marine cargo across Asia, professional indemnity in Australia, motor in continental Europe. It is also the mechanism by which most US program business reaches London capacity. A meaningful share of Lloyd's gross written premium flows through coverholders rather than through direct placements.

Bordereaux

Bordereaux (singular: bordereau) are periodic reports from coverholders to syndicates listing the risks bound, the premium, and the claims activity during the reporting period. Two main types:

• Premium bordereaux: list of new and renewed risks bound, with key fields (insured, period, limit, deductible, premium, classification).
• Claims bordereaux: list of claims notified and movements (paid, reserves, status) during the period.

Bordereaux are submitted weekly, monthly, or quarterly depending on the binder. They drive the syndicate's underlying records, the technical accounting, and the regulatory reporting. The format historically varies wildly by coverholder, with the same data fields appearing under different column headers in different files. Standardization efforts (Lloyd's Coverholder Reporting Standards, the v6 schema) have improved consistency but legacy formats persist.

The Company Market and IUA

Around Lloyd's sits the Company Market: insurance companies with offices in London (or elsewhere) that write the same kinds of business as Lloyd's syndicates, often co-subscribing on the same slips. The trade body for the Company Market is the IUA (International Underwriting Association of London), formed in 1998 from the merger of the LIRMA and ILU.

What IUA companies do

IUA companies write subscription business in many of the same classes as Lloyd's: marine, energy, aviation, war, terrorism, large casualty, professional indemnity, financial lines. A typical large London placement may include both Lloyd's syndicates and IUA companies on the security panel. The slip handles both. The underlying contract mechanics are largely the same.

The historical context

The Company Market existed before Lloyd's as we know it today, alongside the early coffee house arrangements that became Lloyd's. ILU and LIRMA were the major company trade bodies for marine and non-marine respectively. Their 1998 merger into IUA was driven by efficiency (one shared back-office and clearing system) and by the increasing convergence of the two market segments. IUA today represents around 50 member companies and is the largest representative body for international and wholesale insurers based in London.

Why it matters operationally

For brokers placing business in London, the placement is "the London market," not "Lloyd's plus the IUA." The slip-and-subscription mechanics are the same. Premium and claims processing flow through the shared market infrastructure (DXC Technology, Lloyd's Lab, ECF). The distinction between Lloyd's and IUA shows up mostly in regulatory reporting, capital structure, and the protections available to policyholders (the Lloyd's Central Fund applies to Lloyd's policies; IUA companies have their own balance sheets and regulatory regime).

Realistic Disaster Scenarios

RDS, Realistic Disaster Scenarios, is the Lloyd's framework for testing each syndicate's exposure to defined catastrophic events. The PMD updates the RDS list periodically and requires each syndicate to report modeled losses for each scenario as part of the annual business plan and ongoing oversight.

Examples of RDS

• Florida Windstorm. A major hurricane making landfall in Florida, with defined wind speed and track parameters.
• California Earthquake. A major earthquake on the San Andreas system, with defined magnitude and epicenter.
• European Windstorm. A major winter storm sweeping across northern Europe.
• Japan Earthquake. A major Tokyo-area earthquake with defined magnitude.
• Marine. Total loss of the largest insured vessel; major collision in a defined chokepoint; loss of two largest cruise ships.
• Aviation. Two major aircraft collision; loss of the largest insured airline in a single event.
• Liability. Defined large casualty loss event affecting major lines, e.g., financial institution, energy, products.
• Cyber. Major cloud outage event; major ransomware event; major systemic event.
• Terror. Major terrorism event in defined urban areas (London, New York).

How syndicates use RDS

Each syndicate runs its current portfolio against each RDS and reports gross loss, net of reinsurance, and Members' funds at risk. The PMD reviews these against syndicate capital and may require capital uplift, exposure reduction, or additional reinsurance for syndicates whose RDS results are outside tolerances. The framework is one of the principal mechanisms by which Lloyd's manages aggregate market exposure to known peril types.

RDS and the broader portfolio view

RDS is necessarily a sample. It cannot capture every possible disaster. Syndicates supplement RDS with internal model output (typically third-party catastrophe models like RMS or AIR/Verisk for natural catastrophe) and bespoke scenarios for emerging risks (cyber systemic, supply chain, climate transition). The list and methodology evolve as the loss environment evolves.

Lloyd's brokers and the chain

A risk reaching Lloyd's almost always travels through a chain of brokers. Understanding the chain explains a lot of the contracting culture.

The retail broker

The relationship-holding broker who serves the insured directly. In the US this is often a national or regional retail house. The retail broker does not have direct access to Lloyd's; instead, they place specialty business through a wholesale broker.

The wholesale broker

A specialist who places difficult or non-admitted business with surplus lines markets, which often means London. The wholesale broker is the bridge between the retail broker and the wholesale carriers.

The Lloyd's broker

The London-licensed broker who actually walks into the Room (or its electronic equivalent) and negotiates the placement with the underwriters. Some Lloyd's brokers are part of the same global firm as the wholesale broker and the retail broker (e.g., a global broker like Marsh, Aon, or WTW with offices at every layer). Others are independent specialists. The Lloyd's broker holds the relationship with the underwriters and is responsible for the slip, the placement, the premium, and the claims advocacy.

Why the chain looks excessive but rarely is

Three brokers on one risk looks like overhead. In practice, each plays a different role. The retail broker is the relationship and the local servicing. The wholesale broker is the market knowledge and the access. The Lloyd's broker is the negotiation and the placement. The economics get unwieldy on small accounts, which is one of the structural reasons specialty business has consolidated toward larger placements and toward more delegated authority. On large complex risks, the chain is doing real work, and the commission structure, while layered, is not out of line with the value being added.

Where IDP earns its keep

The London Market is a document-intensive environment by any measure. Slips, supplementals, broker covering notes, surveys, schedules, prior loss runs, and bordereaux all flow in through email and through PPL. The volume per syndicate is high. The format heterogeneity is high. The deadline pressure is high. The underwriting is differentiated. That combination is exactly what IDP solves.

The London workflows where Indico shows up

• MRC slip extraction. Pull the standard MRC headings into structured fields. Period, limits, deductibles, territory, security panel with percentages, exclusions, conditions, premium.
• Slip vs broker presentation reconciliation. The broker covering note and the slip are often drafted by different people at different times. Surface inconsistencies before the lead signs.
• Bordereaux ingestion. Convert heterogeneous coverholder spreadsheet formats into a normalized syndicate record. The single largest delegated authority IDP use case.
• Coverholder due diligence. Aggregate coverholder filings, loss ratios, audit findings into a consolidated view for the binder review.
• RDS aggregation reporting. Pull insured locations and limits across the bound book and feed the catastrophe model. Less about extraction, more about pre-modeling normalization.
• Claims movement summarization. On long-tail lines with active litigation, summarize counsel reports and reserve change rationales for inclusion in claims bordereaux and reinsurance reports.