Another central metric is the relationship between customer lifetime value (LTV) and customer acquisition cost (CAC). This ratio helps investors understand whether growth is economically sustainable.

A favourable LTV-to-CAC ratio indicates that the value generated by a customer over time significantly exceeds the cost of acquiring that customer. Even if precise figures are still developing, investors expect founders to have a working model and a clear plan for improving efficiency as the company scales.

An inability to articulate acquisition economics is often viewed as a warning sign at this stage.

Crucially, metrics are not evaluated in isolation. Series A investors focus on patterns, trade-offs and underlying causes. For example, rapid growth paired with rapidly increasing acquisition costs may indicate diminishing returns on marketing spend. Similarly, impressive top-line growth combined with poor retention suggests that the company is filling a leaky bucket. Slower but steady growth accompanied by strong retention and improving margins may be seen as more attractive, as it indicates a durable foundation for future scaling.

Ultimately, Series A is often the stage at which ventures shift from storytelling driven primarily by vision to storytelling grounded in evidence. The narrative remains important, but it must now be supported by data which demonstrates learning, progress and control.

Founders who can clearly explain not just what the numbers are, but why they look the way they do are far more likely to earn investor confidence and secure Series A funding.