What key metrics do Series A investors evaluate before investing?
Short Answer
Series A investors focus on monthly recurring revenue (typically £50-200K+), revenue growth rate (15-20% month-on-month), unit economics (LTV:CAC > 3:1), retention rates, and evidence of product-market fit.
Full Explanation
Series A represents the transition from 'interesting experiment' to 'scalable business,' and investors evaluate a specific set of metrics that demonstrate this readiness. While thresholds vary by sector and geography, consistent patterns emerge across institutional Series A investors.
Revenue metrics are the primary filter. Most Series A investors want to see £50,000-200,000 in monthly recurring revenue (MRR) for SaaS businesses, or equivalent traction metrics for other models (GMV for marketplaces, revenue run-rate for transactional businesses). The growth rate matters as much as the absolute number — 15-20% month-on-month growth signals strong product-market fit. Investors will scrutinise whether growth is organic or paid, and whether it is accelerating or decelerating.
Unit economics must demonstrate a viable business model. The LTV:CAC ratio should exceed 3:1, meaning each customer generates at least three times the cost of acquiring them. CAC payback period (how many months until a customer's gross profit covers acquisition cost) should ideally be under 12 months for SaaS. Gross margins should be 60%+ for software, 40%+ for marketplaces.
Retention and engagement metrics prove that the product creates lasting value. Net revenue retention above 100% (existing customers spend more over time) is a strong signal. Monthly or weekly active user trends, feature adoption rates, and cohort retention curves all contribute to the picture. Churn below 3% monthly for SMB SaaS or below 1% for enterprise SaaS is typical.
Beyond metrics, Series A investors evaluate the team (domain expertise, execution track record), market size (TAM analysis), competitive differentiation, and the clarity of the go-to-market strategy. The strongest candidates combine strong quantitative metrics with a compelling narrative about why this team in this market at this time can build a category-defining company.
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Further Reading
LTV:CAC for Founders: The Ratio That Predicts Fundraising Success
LTV:CAC is the ratio investors use to determine whether your business model works. This guide explains how to calculate it correctly, the benchmarks by stage and business model, and why improving LTV:CAC signals intangible asset compounding.
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