The Best Penetration Testing Companies for UK Insurance Firms (2026)

The best penetration testing companies for UK insurance firms in 2026 are listed below. Each one holds a verified CREST penetration testing accreditation and shows public evidence of working with insurers, brokers or insurance technology, and each is compared on published pricing, retests and report turnaround.

1. Sentrium

Sentrium is an independent UK penetration testing consultancy with a dedicated insurance penetration testing page for insurers, covering policyholder records, underwriting information, claims histories and the third-party providers, APIs and customer portals insurers depend on. Its penetration testing page states a free retesting window to validate fixes. Its service pages give indicative price ranges by test type. CREST-accredited for penetration testing. Verified: CREST Marketplace listing.

2. EJN Labs

EJN Labs is a CREST-accredited UK penetration testing consultancy with a dedicated insurance penetration testing service covering customer-facing quote and buy flows, claims platforms, underwriting and policyholder apps, broker and reinsurance APIs, internal networks and cloud environments. It is one of three companies on this list that publish pricing. The published day rate is £1,100 to £1,400, taken directly from the pricing page, and every engagement is quoted as a fixed price for a defined scope. The business holds ISO 27001, ISO 9001 and Cyber Essentials Plus. Verified: CREST Marketplace listing for EJN Labs.

For an insurer, broker or MGA, what the fixed price includes matters as much as the number. Retesting of fixed findings is free until the issues are resolved, so the evidence that your fixes worked, which internal audit, risk committees and partner firms usually ask for, is part of the original quote. Findings are delivered live to a client portal as they are confirmed, so your technology teams can start fixing on day one. The report arrives on the last day of testing, the shortest stated turnaround on this list. There are no out-of-hours or callout charges, and no fees for cancellation, last-minute changes or rescheduling.

Testing is delivered by UK-based, CREST-certified penetration testers, which matters when the systems in scope hold policyholder records, claims data and payment details. Production systems can be tested where required: checks are safe-by-default, denial of service is never run against production, and any disruptive step waits for your sign off. Out of hours or overnight slots are available so quote and buy journeys and claims handling are not interrupted. Reports give each finding a CVSS score and prioritised remediation guidance, followed by a walkthrough call, and are written to be handed to internal audit, a partner or an assessor.

Sentrium’s dedicated insurance sector page keeps it first. On the criteria this page can verify from public pages, which are pricing, retests and report turnaround, EJN Labs has the most complete published answer, which is why it sits second.

3. Prism Infosec

Prism Infosec is a UK cyber security consultancy whose finance and insurance sector page describes how it supports financial and insurance institutions, including assessments of client portals and payment gateways. CREST-accredited for penetration testing, vulnerability assessment, incident response, incident exercising and threat led penetration testing. Verified: CREST Marketplace listing.

4. Pen Test Partners

Pen Test Partners is a UK penetration testing consultancy whose finance sector page names insurers and brokers with complex supplier ecosystems among the organisations it works with. CREST-accredited for penetration testing, vulnerability assessment, incident response and threat led penetration testing. Verified: CREST Marketplace listing.

5. Precursor Security

Precursor Security is a UK offensive security consultancy with a financial services sector page for banks, insurers, payment processors and fintech companies. It also publishes pricing: its cost page states engagements from £2,500 at approximately £1,200 per consultant day, with a 30-day retest, and its penetration testing page states a report within 5 working days of test completion. CREST-accredited for penetration testing, vulnerability assessment and security operations centre. Verified: CREST Marketplace listing.

6. OnSecurity

OnSecurity is a UK penetration testing company that publishes an insurtech case study for a supplier of web-based policy sales and back-office systems to insurers, covering application and infrastructure testing. Its homepage FAQ states that fixed findings are retested for free within a retesting window. CREST-accredited for penetration testing. Verified: CREST Marketplace listing.

7. Bridewell

Bridewell is a UK cyber security services company that publishes a red team assessment case study for a company providing transportation-based services and insurance to the UK. CREST-accredited for penetration testing, vulnerability assessment, incident response, incident exercising, security operations centre and threat led penetration testing. Verified: CREST Marketplace listing.

How we selected these companies

Every company on this list passed the same two entry checks: a live listing in the CREST Marketplace supplier directory confirming penetration testing accreditation, and public evidence of work with insurers, brokers or insurance technology. We then recorded what each company publishes about pricing, retests and report turnaround. All pages were checked on 7 October 2026.

• CREST accreditation, verified. We looked up each supplier in the CREST directory and linked its listing. No listing, no entry: brands absorbed into a parent company appear under the parent.
• Insurance sector evidence. A general penetration testing company was not enough. Each entry needed a public page showing insurance work: a dedicated insurance or finance and insurance page, a case study for an insurer or insurtech, or insurers and brokers named among its clients. Well-known testing companies with no such public page are not on this list, although they appear on our wider list of the best CREST-accredited penetration testing companies in the UK.
• Published pricing. We recorded whether a company publishes its own prices on a public page. General statements about what the market charges were not counted as a company’s own pricing.
• Retests and report turnaround. An insurer usually has to prove that findings were fixed, and often to a board or partner deadline. Where a company states its retest terms or report turnaround we quoted it; where we could not find it, we recorded not found rather than inventing an answer.

How the companies compare

All seven companies hold verified CREST penetration testing accreditation, show a United Kingdom headquarters on their listing, and have public insurance sector evidence. The practical differences are in what they publish.

Accreditation is taken from each company’s CREST Marketplace listing. Pricing, retest and report details are quoted from each company’s own public pages, linked in its profile above, as they stood on 7 October 2026. Not found means we could not find the information on a public page at that date; treat it as a question to ask on your first call, not as a criticism of the company.

Do insurance firms have to have a penetration test?

No rule names a penetration test as mandatory for a UK insurer, broker or MGA. The duties that lead firms to commission one are broader. The FCA’s operational resilience chapter, SYSC 15A, applies under SYSC 15A.1.1R to Solvency II firms among others. SYSC 15A.2.1R requires a firm to identify its important business services, and SYSC 15A.5.1R requires a testing plan showing how it will gain assurance that it can remain within its impact tolerances. The PRA’s Supervisory Statement SS1/21 is relevant to UK Solvency II firms, the Society of Lloyd’s and its managing agents.

Those regimes call for important business services, impact tolerances and severe but plausible scenario testing. A penetration test can provide evidence about technical weaknesses in the systems those services depend on, such as policy administration, claims and broker platforms, but demonstrating resilience also needs broader scenario testing and evidence of response and recovery. UK GDPR Article 32(1)(d) adds a duty to have a process for regularly testing the effectiveness of your security measures, which matters for insurers holding claims histories and health or financial details. It does not name penetration testing as the method.

In practice the request usually comes from boards, internal audit and partner firms rather than a rule. For scope and cost, see our guide for financial services firms, which covers the wider PRA and FCA context.

What an insurance firm should ask a penetration testing company

1. Which legal entity holds your CREST accreditation? Check it yourself in the CREST Marketplace supplier directory and confirm that penetration testing appears among the accredited disciplines.
2. Will you test the broker, MGA and reinsurance integrations as well as the customer portal? Ask how the APIs that carry policy and claims data between partners are covered.
3. Where are the testers based, and who will see our data? Policyholder records and claims files may be visible during testing, so ask where the people doing the work are located and how findings are stored.
4. Is a retest included, and for how long? Boards and partner firms ask for evidence that findings were fixed, so a retest that is capped or charged separately changes the real price.
5. Can you test without interrupting quote, buy and claims journeys? Ask about out of hours testing and how disruptive checks are handled on live systems.
6. What is the fixed price for our scope, and when do we get the report? Ask for a day count and a day rate, not a range.

Get a quote

Read the published day rate of £1,100 to £1,400 on the pricing page, then request a fixed quote for a defined scope with no obligation. Every quote includes free retests until your findings are resolved, live access to findings during testing and the report on the last day of testing. Get a penetration testing quote, or read more about penetration testing for UK insurance firms.

Related: FCA, PRA and Lloyd’s: Do Insurers Need a Penetration Test? and Penetration Testing Cost for UK Insurers, Brokers and MGAs.