Definition:Line slip
📑 Line slip is a market facility used primarily in the Lloyd's and London insurance markets that pre-authorizes participating underwriters to automatically accept a defined share of risks that fall within agreed parameters, without needing to review each individual placement. Essentially, it functions as a standing agreement among a panel of syndicates or company markets: when the lead underwriter on the line slip accepts a risk that meets the facility's criteria, the following markets' lines are committed automatically. This mechanism accelerates the placing process and gives brokers certainty that qualifying risks can be bound quickly.
🔄 A line slip is established through a negotiation in which the lead underwriter and the broker agree on the scope of risks eligible for the facility — typically defined by class of business, geographic territory, limit size, and premium range. Following underwriters each commit a percentage line, acknowledging that they trust the lead's underwriting judgment for risks falling within the defined appetite. When the lead writes a qualifying risk, they log it onto the line slip, and followers are automatically bound for their agreed percentages. The lead retains discretion over individual risk selection and pricing, while followers benefit from access to a diversified flow of business without the overhead of reviewing every submission. Governance provisions address situations where a risk falls at the boundary of the facility's scope, and most line slips include audit and bordereaux reporting requirements so followers can monitor portfolio performance.
⚡ For the London market, line slips address a perennial challenge: the transaction cost of circulating every risk to multiple underwriters in a subscription market. By bundling follow capacity into a pre-agreed facility, they reduce placement friction and allow brokers to confirm coverage to clients faster — a competitive advantage when competing against single-carrier markets. However, following underwriters accept a degree of delegated authority risk: they depend on the lead's discipline and must trust that the business written stays within the agreed parameters. Regulatory scrutiny from Lloyd's and the PRA has periodically focused on ensuring that followers conduct adequate oversight rather than passively accumulating exposure, making robust reporting and performance monitoring essential components of any well-run line slip.
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