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📊 '''Top and drop''' is a [[Definition:Reinsurance | reinsurance]] structuring technique in which a single [[Definition:Reinsurance layer | layer]] of coverage is designed to sit at the top of a [[Definition:Reinsurance program | reinsurance tower]] for the current period but is also engineered to "drop down" and attach at a lower point in a subsequent period if upper layers are eroded by losses. The mechanism allows a [[Definition:Cedant | cedant]] to obtain multi-year protection that responds dynamically to loss activity, effectively combining elements of traditional annual [[Definition:Excess of loss reinsurance | excess of loss]] coverage with a longer-term commitment from the [[Definition:Reinsurer | reinsurer]]. Though not as widely used as standard layered programs, top and drop structures appear periodically in [[Definition:Catastrophe reinsurance | catastrophe reinsurance]] and large [[Definition:Commercial insurance | commercial]] placements where both parties seek creative solutions to complex risk-transfer needs.

⚙️ A typical arrangement works as follows: the cedant buys an excess of loss tower for the first year, with the top and drop layer positioned as the uppermost tranche. If a significant [[Definition:Loss event | loss event]] partially or fully exhausts the lower layers during that year, the top and drop layer descends — drops — to attach at or near the depleted point for the next coverage period, providing replacement capacity where it is most needed. The terms governing the drop, including the revised [[Definition:Attachment point | attachment point]], any premium adjustments, and the conditions triggering the descent, are all negotiated at inception and documented in the [[Definition:Reinsurance contract | treaty wording]]. Some structures incorporate premium step-ups when the layer drops, reflecting the increased [[Definition:Expected loss | expected loss]] at a lower attachment, while others fix the premium across periods.

💡 This structure appeals to cedants seeking continuity and certainty in their reinsurance programs, particularly after a severe loss year when buying replacement capacity in the open market might be prohibitively expensive or difficult to secure. For reinsurers, the top and drop offers an opportunity to write [[Definition:Premium | premium]] at initially remote layers — where the probability of loss is low — while accepting a commitment that may bring them closer to the risk in later periods. Pricing such structures demands sophisticated [[Definition:Actuarial analysis | actuarial modeling]] that accounts for multi-year loss scenarios, [[Definition:Correlation | correlation]] between periods, and the conditional probability of attachment shifting. The technique is most commonly seen in the [[Definition:Lloyd's of London | London market]] and among large global reinsurers, though cedants and [[Definition:Broker | brokers]] across jurisdictions may deploy it whenever standard annual placements prove inadequate for the risk profile.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Reinsurance program]]
* [[Definition:Attachment point]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Reinstatement]]
* [[Definition:Multi-year policy]]
{{Div col end}}

Definition:Top and drop - Revision history

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