Security Due Diligence for M&A
Security due diligence has become a critical part of M&A transactions. A company's security posture can significantly impact deal valuation, integration costs, and post-close risk. Whether you're buying or selling, understanding what to look for and how to prepare matters.
What Acquirers Look For
Security Program Maturity
- Documented security policies and procedures
- Defined security roles and responsibilities
- Regular security assessments and testing
- Employee security awareness training
- Vendor and third-party risk management
Compliance Status
- SOC 2 Type II reports (or progress toward)
- Industry-specific compliance (HIPAA, PCI, GDPR)
- Regulatory examination history
- Audit findings and remediation status
- Data privacy practices and documentation
Technical Security Controls
- Identity and access management
- Encryption practices (at rest and in transit)
- Network security architecture
- Endpoint protection
- Cloud security posture
- Vulnerability management program
Incident History and Response
- Past security incidents and breaches
- Incident response capabilities
- Business continuity and disaster recovery
- Insurance coverage and claims history
- Litigation related to security
Red Flags That Affect Deals
Undisclosed Security Incidents
Deal breaker or major valuation adjustmentPast breaches that weren't disclosed during diligence. Discovery post-close creates liability and trust issues.
No Security Program Documentation
Significant integration costsNo policies, no defined controls, security by hope. Signals significant work needed post-acquisition.
Unpatched Critical Vulnerabilities
Immediate risk exposureKnown vulnerabilities left unaddressed, especially in production systems. Indicates operational discipline issues.
Privileged Access Without Controls
Insider threat riskExcessive admin access, no access reviews, former employees still with access. Common in fast-growing startups.
No Compliance Certifications
Customer retention riskEnterprise customers increasingly require SOC 2 or equivalent. Missing certifications may limit growth.
Security Embedded in Technical Debt
Long-term remediation costsSecurity issues baked into architecture that require significant refactoring to address.
Key Person Dependencies
Post-close operational riskAll security knowledge in one person's head. If they leave, security program leaves with them.
Seller Preparation Timeline
If you're preparing for a potential exit, start security preparation early. Here's a realistic timeline:
6-12 Months Before
- Get a security assessment to understand your current posture
- Identify and document all security policies and procedures
- Begin SOC 2 process if not already certified
- Address any obvious gaps or vulnerabilities
- Organize security documentation for data room
3-6 Months Before
- Complete penetration testing and address findings
- Ensure access management is clean (former employees removed)
- Document incident history honestly (it will be found)
- Prepare security program overview for buyers
- Brief leadership on security talking points
During Diligence
- Be responsive to security diligence requests
- Provide honest answers - spin will backfire
- Have security leadership available for calls
- Explain gaps with context and remediation plans
- Demonstrate active security program, not just documentation
Buyer Assessment Framework
A thorough security assessment covers these areas:
Document Review
- Security policies and procedures
- Compliance reports and certifications
- Penetration test results
- Vulnerability scan history
- Incident response plans
- Insurance policies
Technical Assessment
- External vulnerability scan
- Cloud security posture review
- Code security analysis
- Access control review
- Data flow mapping
- Architecture security review
Interviews
- Security leadership (if exists)
- Engineering leadership
- IT operations
- Compliance/legal
- Key technical staff
Risk Quantification
- Remediation cost estimates
- Integration security costs
- Insurance gap analysis
- Compliance timeline and costs
- Potential liability exposure
Typical Due Diligence Timeline
Initial Screening
1-2 weeksHigh-level security posture review based on available documentation. Identify obvious red flags.
Detailed Diligence
2-4 weeksIn-depth technical and documentation review. Interviews with key personnel. Technical assessments.
Risk Assessment
1-2 weeksQuantify identified risks. Estimate remediation costs. Prepare security findings report.
Integration Planning
OngoingSecurity integration roadmap. Day-one priorities. 90-day security plan.
Frequently Asked Questions
How does security affect M&A deal valuation?
Security issues can affect valuation in several ways: direct remediation costs (often $100K-$1M+), insurance premium increases, customer churn risk if certifications are missing, integration costs, and potential liability exposure. Major undisclosed incidents have killed deals entirely.
What security certifications do acquirers look for?
SOC 2 Type II is the most common requirement for B2B software companies. Healthcare targets need HIPAA compliance. Financial services may need additional certifications. ISO 27001 is increasingly common for international deals. The specific requirements depend on the target's customer base and industry.
How long does security due diligence take?
Typically 3-6 weeks for thorough security diligence, though this can be compressed or extended based on deal timeline and complexity. Initial screening can happen in days; deep technical assessment takes longer. PE firms often have standardized processes that move faster.
Should we disclose past security incidents?
Yes. Undisclosed incidents that are discovered during or after diligence are far more damaging than honest disclosure with context. Buyers expect some incidents - what matters is how they were handled, what was learned, and what was improved.
What happens to security programs post-acquisition?
This depends on the integration strategy. Bolt-on acquisitions may maintain separate security programs. Full integrations typically merge into the acquirer's security program. Either way, expect security integration to be a focus during the first 90 days post-close.
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