Special Purpose Insurer
Definition
A special purpose insurer (SPI) is a reinsurance vehicle licensed to carry on only fully collateralized business. Bermuda's Insurance Act 1978 defines special purpose business as insurance under which an insurer 'fully collateralizes its liabilities to the persons insured' through the proceeds of debt whose repayment is subordinated to the insured's rights, or another approved financing, cash and time deposits. In a cat bond, the SPI is usually the issuer: it sells notes to investors, holds the proceeds in trust and reinsures the sponsor.
Why it matters
The vehicle is what investors' money actually sits in. Its licence, the trust that holds collateral, the permitted investments and the priority of payments decide whether the full collateral is there when a claim or a redemption is due. For segregated or protected cell structures, whether each cell is genuinely ring-fenced from the others also matters.
Common misconceptions
- •An SPI is not a rated reinsurer; its strength is the collateral, not its capital base.
- •Note holders are subordinated to the insured by design. They are paid after claims.
- •A licence does not mean the regulator reviews each transaction's risk for investors.
- •The label is only a starting point. Investor outcomes usually depend on the governing documents, cash-flow priority, valuation policy, disclosure quality, and manager discretion surrounding the term, not just the shorthand definition used in marketing materials.
Technical details
What the Insurance Act 1978 says (section 1)
Special purpose business: the insurer fully collateralizes liabilities through subordinated debt proceeds or another approved financing, cash and time deposits.
Special Purpose Insurer: an insurer that carries on special purpose business.
Restricted special purpose business: special purpose business between an SPI and specific insureds approved by the Authority.
Documents to read
Offering circular and priority of payments.
Reinsurance agreement with the sponsor.
Trust agreement and permitted investments.
Extension, commutation and collateral release provisions.
How investors apply the term
Investors usually apply this term by tying the definition back to the controlling documents and then asking which cash flows, rights, restrictions, or valuation assumptions it changes. A useful review looks at the term alongside fees, leverage, liquidity, reporting frequency, and manager discretion rather than treating it as a standalone concept.
The practical diligence test is simple: identify who benefits if the assumption is wrong, who has control when conditions change, and what evidence the investor receives after closing. Terms that cannot be reconciled to documents, cash movements, and monitoring data should be treated as marketing shorthand until proven otherwise.
Frequently asked questions
- Why use a special purpose insurer?
- To isolate the transaction: the SPI holds only the collateral and the one contract, so investors are exposed to the insured event and the collateral, not to the sponsor's or a reinsurer's wider balance sheet.
- Who owns the SPI?
- Often a charitable or purpose trust holds its ordinary shares, so that the vehicle is not part of the sponsor's group; Swiss Re's 2011 primer notes this 'shelters the SPV from a potential bankruptcy of a sponsor.' Investors hold notes or preference shares, not control.
- Is every collateralized vehicle an SPI?
- No. Bermuda also has 'Collateralized Insurer' registrations for insurers that carry on special purpose business but are not SPIs, and other domiciles (Cayman, Ireland) use their own classes. Segregated accounts companies such as RenaissanceRe's Upsilon RFO hold separate pools in ring-fenced accounts.