PlumBot: Bot: Creating new article from JSON

2026-03-09T16:35:00Z

Bot: Creating new article from JSON

New page

📏 '''Line size''' is the amount of [[Definition:Risk | risk]] — expressed as a dollar figure or percentage of a total placement — that a single [[Definition:Underwriter | underwriter]], [[Definition:Insurance carrier | carrier]], or [[Definition:Lloyd's syndicate | Lloyd's syndicate]] agrees to accept on a given [[Definition:Insurance policy | policy]] or [[Definition:Reinsurance | reinsurance]] contract. In subscription markets such as [[Definition:Lloyd's of London | Lloyd's]] and the broader [[Definition:London market | London market]], where multiple participants share a single risk, the line each underwriter takes determines its proportional share of the [[Definition:Premium | premium]], [[Definition:Insurance claim | claims]], and administrative obligations.

📐 When a [[Definition:Insurance broker | broker]] brings a risk to market, the [[Definition:Lead underwriter | lead underwriter]] typically sets the terms and writes the first — and often largest — line, signaling confidence in the pricing and conditions. Subsequent [[Definition:Following underwriter | following underwriters]] then decide what share to take, guided by their own appetite, their [[Definition:Aggregation risk | aggregation]] constraints, and the credibility of the lead. The broker's job is to assemble enough lines to fill the placement to 100 percent. If demand is strong, the placement may be oversubscribed, requiring lines to be scaled back — a process called [[Definition:Signing down | signing down]]. Conversely, a difficult risk may struggle to attract sufficient [[Definition:Underwriting capacity | capacity]], leaving the broker to negotiate broader terms or accept a lower total limit.

💡 Line size decisions reflect far more than simple appetite. Each participant must weigh its [[Definition:Probable maximum loss (PML) | probable maximum loss]], [[Definition:Coverage limit | per-risk limits]] set by its board or [[Definition:Reinsurance program | reinsurance treaties]], and the cumulative effect the new line has on portfolio concentration. A syndicate that writes overly large lines relative to its [[Definition:Capital | capital base]] exposes itself to outsized volatility, while one that writes consistently small lines may fail to earn enough [[Definition:Premium | premium]] to cover fixed expenses. For [[Definition:Managing general agent (MGA) | MGAs]] and [[Definition:Coverholder | coverholders]] arranging capacity, understanding each participant's preferred line size is essential to building stable, long-term panel relationships.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Subscription market]]
* [[Definition:Lead underwriter]]
* [[Definition:Signing down]]
* [[Definition:Underwriting capacity]]
* [[Definition:Lloyd's syndicate]]
* [[Definition:Aggregation risk]]
{{Div col end}}

Definition:Line size - Revision history

PlumBot: Bot: Creating new article from JSON