Founders prepping for a Series A or B tend to obsess over growth metrics, user acquisition and market share. Pitch decks lean on revenue multiples and product roadmap milestones. But UK venture capital firms have changed how they evaluate startups over the last few years, and around 66% now run cybersecurity due diligence before writing a cheque.
A weak security posture will delay a term sheet or knock down your valuation. Here’s exactly what to have in place before investor scrutiny starts.
How Investors View Security
Venture capital firms know a data breach will destroy a startup’s reputation overnight, and IBM’s 2025 Cost of a Data Breach Report puts the average credential-based breach at around $4.45 million. Investors want proof their capital will fund product development, not ICO fines or ransomware payments. Cyber risk is now a direct valuation factor and can trigger price adjustments, escrows or delayed closes.
Technical due diligence teams also treat security hygiene as a proxy for how the company is run. If a startup cuts corners on data protection, investors will assume the same across financial controls and engineering.
Essential Security Controls for Startups
Independent Security Assessments
Founders can’t just claim their application is secure. Investors will want objective proof from an external third party, ideally CREST-accredited, which is the standard most UK enterprise buyers and regulated clients now insist on. Commission this well before the term sheet is drafted.
You’ll need to show structured reports that flag vulnerabilities alongside clear remediation steps. In the UK, that means working with providers who follow recognised methodologies and hold the right accreditations, so look at penetration testing services in the UK that deliver the kind of structured, certified assessment and detailed reporting investors expect to see. A clean report from a CREST or CHECK-accredited provider will show you take threat protection seriously.
Strict Access Controls
Another focal point is how you manage internal access to sensitive business data. Investors will ask whether you enforce multi-factor authentication across every internal platform. The ICO has treated the absence of MFA on systems holding personal data as an Article 32 failure in past enforcement decisions, so this isn’t optional. They’ll also check for single sign-on to centralise access.
Expect questions on least privilege too. Employees should only hold access rights to the specific data their role needs. You’ll want a clear joiner-mover-leaver process that revokes access the moment someone leaves.
Encryption Requirements
Data protection isn’t negotiable for a serious raise. VCs will review your architecture to confirm you encrypt data at rest and in transit. The ICO’s May 2025 guidance is specific about what “state of the art” looks like: AES-256 for data at rest, TLS 1.2 or 1.3 in transit, and SSL is explicitly prohibited.
This means checking databases, cloud storage buckets and API connections. Missing this basic control is an immediate red flag for any technical DD team and will raise questions about your UK GDPR compliance.
Prepare an Incident Response Plan
Even secure startups will get hit eventually. Investors want to know how you’ll react when things go wrong. A documented incident response plan shows you anticipate realistic threats.
The plan should name who takes charge during a crisis, cover public communications, legal reporting and technical recovery. Under UK GDPR, you’ll need to notify the ICO within 72 hours of a personal data breach where there’s risk to individuals, so build that timeline into the plan. Test it regularly with the team, don’t leave it in a shared folder.
Manage Supply Chain Risks
Your startup is only as secure as the vendors you rely on daily. VCs are acutely aware of supply chain attacks and will evaluate how you assess the security of your third-party software and service providers.
What Investors Will Actually Ask For
Meeting these expectations takes time and resource, and it’s easier to build the controls in early than to scramble during due diligence. Scrambling signals disorganisation and will cost you leverage on terms.
Founders who show up with a mature security posture will stand out. You’ll give UK VCs confidence that their capital is going into a business that can protect it. Get these controls in place before you open the data room and you’ll protect both your valuation and your timeline.
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