Definition:Written line
📝 Written line is the percentage of risk that a syndicate or insurer commits to on a slip or placing document in a subscription market, representing that participant's share of the total premium and losses before any signing-down adjustments. In Lloyd's and similar co-insurance markets, a single risk is rarely borne by one carrier; instead, multiple participants each "write a line" — say 10%, 20%, or 5% — until the slip is fully subscribed or oversubscribed.
🔢 When the aggregate of all written lines exceeds 100%, the broker and the lead underwriter typically sign the slip down proportionally so that every participant's share is reduced to fit a 100% total. The initial written line therefore differs from the signed line, which reflects each participant's final, adjusted share. For example, if a syndicate writes a 25% line but the slip closes at 125% total, its signed line after proportional reduction would be 20%. This distinction matters for reserve calculation, bordereaux reporting, and accurate allocation of premium income across participants.
📐 Understanding the relationship between written and signed lines is fundamental for anyone operating in subscription or co-insurance markets. Oversubscription can be a positive signal — it indicates strong market appetite for the risk — but it also means each participant ends up with less exposure than initially expected, which can affect an underwriter's portfolio construction and capacity planning. Accurate tracking of written versus signed lines feeds directly into management reporting, solvency calculations, and reinsurance cession decisions.
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