Security and AI due diligence for private equity and investors

You are about to sign, and the security posture of the target is part of what you are buying. Zero Day Security runs security and AI-strategy due diligence on your timeline, then stays on after close to fix what we found. The same team that diagnoses the risk is the team that helps remediate it, so nothing gets lost in handoff.

Pre-deal diligence, scoped to the deal clock

Diligence is worthless if it lands after the deadline. We scope the review to the time you actually have and report against the questions an investment committee asks: what is exposed, what is fragile, and what is a deal issue versus a fix-it-later issue. You get a clear read on the target's security posture, not a generic checklist.

Posture is not protection. A scan or a stack of certifications shows what a target has and where it is weak, but it stops nothing at runtime. We tell you the difference, because the gap between looking secure and being secure is exactly the kind of surprise that shows up after you own the company.

AI-strategy diligence: moat or liability

More targets now run their business on AI that acts, not just answers, and that changes the question. Is the target's AI a durable advantage, or an attack surface you will spend years containing? We assess how the AI is built, governed, and exposed, drawing on the OWASP Agentic Security Initiative, the OWASP LLM Top 10, MITRE ATLAS, and the NIST AI Risk Management Framework.

Some AI-security gaps are architecture, not something a product fixes. When that is true, we say so plainly, so you can price the work realistically instead of assuming a tool will close it.

Risk translated for the thesis

Findings only matter if the deal team can act on them. We translate technical risk into business language: what could interrupt the revenue you are underwriting, what could damage the brand, and what would slow integration. We describe severity qualitatively and in plain terms. We do not invent dollar figures or quote vendor statistics we cannot stand behind.

Post-close remediation and a prioritized plan

Diligence tells you what is wrong. The work after close is fixing it. We hand the deal team a prioritized remediation plan that sequences the highest-risk items first and fits the operating reality of a company in transition. Where you want it, we stay on as the security partner that executes against that plan.

This is where diagnosis becomes engagement. The diligence read shows what is wrong for everyone at the table. The remediation, the leadership, and the day-to-day operation are the paid work that follows.

Portfolio-wide posture

One company is a deal. A portfolio is a pattern. We can run a consistent posture read across holdings so you compare like with like, spot the common weaknesses worth fixing once across many companies, and give your LPs a defensible view of security and AI risk. The frameworks behind the work, including ISO/IEC 42001, ISO 27001, SOC 2, and the NIST AI Risk Management Framework, stay the same across the portfolio so the comparison holds.

• Pre-deal diligence scoped to the signing timeline, reporting deal issues versus fix-later issues.
• AI-strategy diligence that judges whether the target's AI is a moat or a liability.
• Risk translated for the thesis in plain business terms, with no invented numbers.
• A prioritized post-close plan that sequences the highest-risk work first.
• Portfolio-wide posture read on a consistent framework for board and LP reporting.