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Underwriter explainer
Several well-known UK retail pet insurance brands are wrappers around the same underwriter and policy wording. This guide sets out which brands share an underwriter, confirmed from each brand's own documents.
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Last reviewed: 20 June 2026
Tesco and Sainsbury's Bank pet insurance are both arranged, administered and underwritten by Pinnacle Insurance Ltd (FCA register number 110866), as each brand states on its own site. Tesco moved to Pinnacle from Royal and Sun Alliance only in January 2025. Comparing brands that share an underwriter as if they were independent products can be misleading, because the policy wording and claims handling sit with the same insurer.
Key facts
- Tesco pet insurance: underwritten by Pinnacle Insurance Ltd (FRN 110866).
- Sainsbury's Bank pet insurance: underwritten by Pinnacle Insurance Ltd (FRN 110866).
- Tesco switched to Pinnacle from Royal and Sun Alliance in January 2025.
- Shared underwriter means shared wording and claims handling.
- Verified from each brand's own website on 20 June 2026.
Why the underwriter matters
A pet insurance brand is often a distribution name, not the insurer carrying the risk. The underwriter writes the policy, sets the wording and pays the claims. When two retail brands share an underwriter, their policies tend to share the same template, the same exclusions and the same claims process, even though the branding, price and loyalty perks differ. Treating them as fully independent options in a comparison overstates how much real choice there is.
Brands underwritten by Pinnacle
Several supermarket and high-street pet insurance brands run on Pinnacle Insurance Ltd. Tesco states on its own site that its pet insurance is arranged, administered and underwritten by Pinnacle Insurance Ltd, register number 110866. Sainsbury's Bank states the same, with the identical register number and registered office. This is a recent arrangement for Tesco, which moved to Pinnacle from Royal and Sun Alliance in January 2025, so older reviews that name a different underwriter are out of date. Other retail brands have historically sat on the same underwriter, and each should be checked against its current policy document.
What this means when comparing
If two brands share Pinnacle as underwriter, the meaningful differences are price, the loyalty scheme (Nectar points with Sainsbury's, Clubcard benefits with Tesco) and the chosen cover tier, not the underlying cover mechanics, which follow the shared wording. The comparison table treats shared-underwriter brands as a group for this reason, and points here for the detail.
Disclaimer
This page is editorial information, not financial advice. Kael Tripton Ltd is not authorised or regulated by the Financial Conduct Authority and does not arrange, advise on or sell insurance. Cover terms and figures change. Always confirm current details in the provider policy documents before buying.
Who underwrites Tesco and Sainsbury's pet insurance?
Both are arranged, administered and underwritten by Pinnacle Insurance Ltd, FCA register number 110866, as each brand states on its own website.
Did Tesco change its pet insurance underwriter?
Yes. Tesco moved to Pinnacle Insurance Ltd from Royal and Sun Alliance in January 2025, so the way claims are made depends on when the policy was taken out or renewed.
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