Due Diligence Red Flags

Due diligence is where Series A deals go to die. Even promising companies can lose investor interest when problems surface during the investigation phase. Understanding what investors look for—and what kills deals—helps you prepare and address issues before they become fatal.

The best founders are proactive about disclosure. They bring potential issues to light themselves rather than waiting for investors to discover them. Transparency builds trust. Hiding problems destroys it.

Financial red flags are the most common deal-killers. Investors are looking for accurate numbers and consistent trends.

Revenue Irregularities: Aggressive revenue recognition, channel stuffing, or one-time deals presented as recurring revenue. Investors have seen these tricks before—they will find out.

Inconsistent Metrics: Metrics that do not tie together. Revenue in the P&L does not match the billing system. Customer counts do not match revenue. Inconsistencies signal data problems.

Missing Support: Revenue recognized but no contract on file. Expenses without source documents. When investors ask for backup, it should exist.

High Customer Concentration: More than 30-40% of revenue from a single customer raises serious concerns about business stability and scalability. What happens if you lose that customer?

Unrealistic Unit Economics: LTV:CAC ratios that seem too good to be true, or metrics that would deteriorate rather than improve at scale.

Legal issues can kill deals quickly. Investors do not want to inherit litigation or compliance problems.

Intellectual Property Issues: Missing inventor assignments, prior employer claims on IP, or open source licensing problems. Get IP cleared before raising.

Founder Disputes: Unresolved conflicts among co-founders, or departed co-founders without clear equity resolution. These issues do not disappear after funding.

Compliance Failures: GDPR violations for companies with EU customers, missing SOC 2 for enterprise sales, or regulatory exposure in regulated industries.

Employment Issues: Misclassified contractors (should be employees), unpaid wages, or discrimination claims. These create immediate liability.

Litigation History: Pending litigation, especially from customers or employees. Even settled litigation should be disclosed upfront.

Cap table problems are surprisingly common and can delay deals for months.

Missing Documentation: Equity grants without proper paperwork—board approvals, stock agreements, 83(b) elections. Every grant needs documentation.

Promised but Unissued Equity: Verbal promises to employees or advisors that were never formalized. These ghost grants cause disputes.

Unclear Ownership: Confusion about who owns what. Missing stock certificates or incomplete cap table records.

Excessive Dilution: Founders with less than 50% ownership after seed round may have difficulty raising at reasonable terms. Investors worry about founder incentives.

Complex Capital Structure: Multiple classes of stock with different rights, or convertible notes with problematic terms. Simpler is usually better.

Operational issues signal execution risk and can derail otherwise promising deals.

Key Person Dependency: Company cannot function without one person. No documentation, no processes, no backup. This is a major risk for investors.

Technology Issues: Significant technical debt, security vulnerabilities, or dependence on deprecated systems. Investors will do technical diligence.

Customer Churn: High or increasing customer churn. Churn that would worsen at scale is especially concerning.

Burn Rate Mismatch: Burn rate that does not match the stage or that would require unrealistic growth to justify.

Team issues can be the hardest red flags to overcome. Investors bet on people as much as ideas.

Unable to Explain Metrics: Founders who cannot immediately answer questions about their metrics, trends, or variances. This signals lack of engagement with the business.

Lack of Domain Expertise: Team without relevant experience for the market they are targeting. Investors want to see you understand your market.

Misaligned Incentives: Founder compensation that is too high for the stage, or equity that is too concentrated in non-contributing founders.

Founder Conflict: Visible tension between co-founders, or history of departures without clear reason.

Having issues is not fatal—hiding them is. Here is how to handle potential red flags.

Be Proactive: Bring issues to light before investors discover them. Frame them as challenges you have identified and are addressing.

Show Progress: Do not just disclose problems—show what you are doing to solve them. Issues being actively addressed are less concerning than unsolved problems.

Provide Context: Explain why the issue is less serious than it might appear. For example, a high customer concentration might be because you deliberately focused on enterprise customers.

Get Help: Address structural issues with professional help. A fractional CFO for financial issues, employment lawyer for classification issues, or IP counsel for IP concerns.

Timeline: Give investors a realistic timeline for resolution. Promises without timelines are not convincing.