In Bermuda, Cat Bond Sponsors Route Premiums Through Empty Reinsurers
Catastrophe bond sponsors have learned to move premium through reinsurance entities that exist mostly on paper. Bermuda cell companies with no employees, no underwriting staff, and capital measured in the low millions now sit between primary insurers and the ILS investors who ultimately bear the risk. The Vesttoo fraud showed what happens when nobody traces that flow.
The Empty Reinsurer Problem
Bermuda hosts hundreds of registered insurers that share a single address and a single administrator. Many are special purpose insurers, or SPIs, created for one transaction. They have no payroll, no claims department, and no physical office beyond a registered agent's filing cabinet. The Bermuda Monetary Authority licenses them under a light-touch regime designed for captive and cell structures.
The economics work because the SPI never intends to handle a claim itself. It cedes risk onward to a reinsurer, which cedes to another, until the risk lands with ILS investors or a rated carrier. Premiums move in the opposite direction, often through three or four affiliated entities before reaching anyone who could actually pay a loss.
Vesttoo collapsed in 2023 after investors discovered that letters of credit purporting to secure billions in reinsurance were fabricated. The mechanics it exploited were not exotic. They relied on sponsors and brokers accepting documentation at face value because the structure looked familiar.
How Premiums Flow Through Cells
A typical cat bond starts with a sponsor, usually a property insurer, that wants to offload hurricane or earthquake risk. The sponsor cedes premiums to an SPI, which issues a bond to ILS investors. If a qualifying catastrophe occurs, the bond principal goes to the sponsor; otherwise investors get their money back plus a coupon.
Between the sponsor and the SPI, though, sits a reinsurance layer. The sponsor pays premium to a Bermuda cell, the cell pays a portion to another reinsurer, and that reinsurer may retrocede to a third entity. Each layer takes a fee. Each layer adds a counterparty that a regulator would need to examine separately.
Collateral letters of credit underpin the whole arrangement. A reinsurer posting an LOC against its obligations lets the ceding insurer count the reinsurance as an asset. If the LOC is fake, the asset is fake, and the ceding insurer's balance sheet overstates its protection.
Vesttoo and the Collateral Illusion
Vesttoo's model was to arrange reinsurance capacity backed by letters of credit from a bank. Sponsors received what looked like fully collateralized reinsurance. The LOCs were supposed to guarantee that if the reinsurer failed, the bank would pay. According to Artemis.bm, a former China Construction Bank manager pleaded guilty in 2026 to accepting bribes to authenticate false collateral documentation.
The bribery element matters because it defeated the one control that should have worked. Banks do not normally issue LOCs without verifying the underlying obligation. A corrupt bank employee can authenticate a document that does not correspond to any real credit facility. The resulting capacity looks real to every downstream party.
Estimates of the notional exposure ran into the billions. The exact figure is disputed, but the mechanism is not. Sponsors booked reinsurance recoverables against collateral that did not exist. When the fraud surfaced, some ceding insurers had to restate their capital positions.
Why Regulators Missed the Signs
Bermuda's cell company filings lack granularity. A cell may report aggregate premiums and aggregate recoverables without naming the counterparties or breaking out affiliated transactions. An examiner looking at a single cell sees a compliant entity. The pattern only appears when you trace premium across several entities at once.
Rating agencies rely heavily on sponsor attestations and on the representations of the reinsurance broker. If the broker presents an LOC from a reputable bank, the agency may treat the collateral as verified. That assumption held until it did not. KBRA has since warned that soft reinsurance market pricing can allow insurers to improve earnings while masking weaker protection, and that management response determines the credit outcome.
The trade-off is real. Bermuda's light-touch regime attracts legitimate ILS business that would otherwise go to more expensive jurisdictions. Tightening cell-level disclosure would raise costs and push some transactions offshore. Regulators face a genuine choice between transparency and competitiveness.
What the Filings Actually Show
Ceded premium ratios raise the first flag. When a Bermuda cell cedes more than 90 percent of the premium it receives to an affiliate, the cell is not retaining meaningful risk. It is a conduit. Conduits are legal, but they shift the question of who actually bears the risk to the next entity in the chain.
Reinsurance recoverables that outpace capital are the second flag. A cell with $5 million in capital and $200 million in recoverables depends entirely on its counterparties performing. If one counterparty's collateral is defective, the cell is insolvent on a mark-to-market basis.
Affiliated reinsurance transactions obscure the picture further. When premium moves between entities under common control, the consolidated group may be adequately capitalized even if individual cells are not. A related piece on this site argues that reinsurance recoveries decide which claims get paid first, and the same sequencing logic applies here: the entity furthest from the sponsor absorbs the loss.
Sponsors book fees before losses emerge. The ceding commission, the structuring fee, and the spread between premium paid and premium ceded all hit the income statement in year one. Losses, if they come, arrive years later. That timing mismatch rewards volume over underwriting discipline.
The Economics of the Conduit
The fee stack explains why the structure persists. A sponsor pays a ceding commission to the first cell, typically in the range of 15 to 25 percent of premium. The cell retains a structuring fee, often a few hundred thousand dollars per transaction, and passes the remainder to the next entity. Each subsequent layer takes its own spread. By the time premium reaches the ultimate risk bearer, the cumulative leakage can exceed 30 percent of the original amount.
For the sponsor, that leakage is the cost of capital relief. Booking a reinsurance recoverable removes risk from the balance sheet and frees up capacity to write more business. The sponsor's return on equity improves immediately, and the fees are paid from premium that would otherwise sit as a loss reserve. The incentive to push volume through the structure is strong even when the underlying underwriting is marginal.
For the ILS investor, the leakage is a drag on yield. A cat bond coupon that looks attractive at 8 percent may net closer to 5 percent after the sponsor's ceding commission and the intermediary fees are subtracted. Investors who do not trace the full chain may misjudge the compensation they are receiving for tail risk.
Actions for Sponsors and Investors
Demand named counterparty verification for every reinsurance layer. A sponsor should know the legal name, jurisdiction, and regulator of each entity in the chain, not just the broker's summary of the structure.
Trace premium flow to the ultimate risk bearer. If premium passes through three entities and none retains more than 10 percent, the sponsor should ask who does retain risk and what collateral supports it.
Scrutinize collateral letters of credit directly with the issuing bank. Do not accept a copy from the broker. Confirm the facility exists, confirm the amount, and confirm the bank knows the obligation it is securing.
Hedge cat bond exposure across uncorrelated perils. A portfolio concentrated in Florida wind and California quake carries correlated tail risk that a single bad season can realize.
Report suspected shell structures to the Bermuda Monetary Authority or the relevant state insurance regulator. A related piece on US telematics auto cover ceding less premium than German motor policies shows how cession ratios vary by line, and the same comparative instinct applies to Bermuda cells.
This article is informational and not personalised professional advice. Insurance and investment decisions should be made with a qualified adviser who can review the specific facts of your situation.
