Tech small-caps: the metrics that matter and the ones that mislead

There is a version of tech investing that looks straightforward on paper. You find a software company growing fast, you back it early, and you watch the valuation compound as the business scales. The reality, particularly in the small-cap space, is considerably more complicated than that. Technology companies at the smaller end of the market bring their own logic, their own failure modes, and a set of metrics that demand more careful reading than the headline revenue numbers most investors reach for first.

The starting point for understanding any technology small-cap is the distinction between a product and a platform. A product company sells a discrete piece of software that solves a specific problem. A platform company builds infrastructure that other businesses depend on, often with network effects that make the product more valuable as more people use it. That distinction matters because the economics are fundamentally different. Platform businesses tend to have higher switching costs, stronger pricing power, and more durable competitive positions. Product businesses can be excellent investments too, but they face the constant risk of being replicated or made redundant by something better.

Within that context, the metrics that define the health of a software business have become a shared language among investors who follow the sector. Annual recurring revenue, or ARR, is the headline figure for any subscription-based company: it tells you the annualised value of contracted customers and gives you a baseline for forecasting. Monthly recurring revenue, MRR, is the same figure on a shorter time horizon and tends to matter more for earlier-stage companies where growth is fast and the numbers shift quickly. Neither of these figures tells you much on its own. What matters is the direction of travel, and the quality of the revenue behind the number.

Churn is where many technology small-caps quietly unravel. Gross churn measures the percentage of revenue lost from customers who cancel or downsize in a given period. Net revenue retention goes a step further and accounts for expansion revenue from existing customers. A company with net revenue retention above 100 per cent is growing its revenue base from its existing customers alone, even before it adds a single new name to the list. That is an exceptionally powerful position to be in, and it is the signature of genuinely sticky software. When you see net revenue retention below 90 per cent, the company is running to stand still, spending heavily on new customer acquisition just to replace what it keeps losing out the back door.

Customer acquisition cost and lifetime value are the two sides of that equation. Customer acquisition cost is what the company spends on sales and marketing to win a new customer. Lifetime value is the total revenue that customer is expected to generate over the course of the relationship. The ratio between them is one of the most telling numbers in a software company’s financials. A ratio of three to one, with lifetime value three times the cost of acquisition, is a commonly cited benchmark for a sustainable business model. Many small-cap tech companies burn through cash at a rate that implies this ratio will never close in their favour. The growth looks impressive. The unit economics do not.

This is where the Rule of 40 becomes a useful shortcut. The rule states that a healthy software company should have a combined revenue growth rate and profit margin that adds up to at least 40. A company growing at 30 per cent with a 10 per cent operating margin clears the bar. One growing at 60 per cent with a 25 per cent operating loss also clears it, though with a very different risk profile. The rule is imperfect, as all rules of thumb are, but it forces investors to think about growth and profitability together rather than treating revenue acceleration as a virtue in isolation.

GB Group, the digital identity verification business, is a useful case study in how this looks in practice at the smaller end of the UK market. The company built its position gradually across multiple verticals, compounding revenue from a base of recurring contracts with banks, telecoms operators, and retailers who depend on identity checks as a core part of their operations. The switching costs are high because the product is embedded in customer workflows. The addressable market is genuinely large. The growth story, when it has worked, has been driven by expansion into existing customers alongside new logo acquisition. The result has been a business that at various points has been among the more durably valued technology names on AIM, though it has not been without its own execution challenges during periods of integration following acquisitions.

The contrast worth drawing is with companies that grow fast by selling a product that customers find easy to adopt but equally easy to abandon. High growth combined with high churn is not a business. It is a marketing exercise running on borrowed time. The investors who have been burned most badly in UK technology small-caps have typically been those who focused on the growth rate without asking what was underneath it.

Funding dynamics add another layer of complexity. Unlike industrial or consumer businesses of similar size, technology companies at the small-cap stage almost always require multiple rounds of external capital before reaching self-sustaining profitability. That is not in itself a problem, but it shapes the risk profile considerably. Each funding round carries potential dilution for existing shareholders. Each round also tests the market’s appetite for the story at that particular moment. Companies that hit a funding round in a difficult market environment can find themselves accepting terms that shift the value equation significantly. Understanding a tech small-cap means understanding its runway: how long the current cash position lasts before the next raise, and what conditions that raise will require.

The technology sector also throws up companies that benefit genuinely from structural trends and companies that simply claim to. Artificial intelligence is the current example. The number of small-cap businesses that have added AI language to their investor communications without materially changing what their products do is significant. Distinguishing between a company with real AI capability embedded in its core product and one that has rebranded a basic automation tool as an AI platform requires reading the product documentation rather than the press release. The test is always whether the technology is solving a problem the customer would otherwise pay to have solved, and whether there is evidence customers are actually renewing their contracts.

Revenue growth in technology is seductive because it feels like evidence. A company doubling its ARR each year looks like it is on the right trajectory. But gross margin is the health indicator that separates the real from the precarious. A software business should, once it has reached meaningful scale, be generating gross margins above 60 per cent. Anything materially below that suggests either that the business is not really a software business, or that its growth is being driven by services and implementation work that does not scale the way pure software does. Platform businesses at their best generate gross margins well above that level, which is what makes them so attractive when the unit economics eventually work.

The small-cap tech space rewards patience and scepticism in roughly equal measure. The companies worth holding are those with demonstrable switching costs, improving net revenue retention, and a pathway to profitability that does not depend on perpetually rising valuations. Finding them requires going further than the growth rate.

This post is drawn from The Little Book of Small-Caps by Cameron Oliver. Republished with permission.

Small Caps is a series drawn from first-hand experience of UK and global small-cap markets, updated as each new chapter arrives.

Disclaimer: The value of investments can go down as well as up, and you may get back less than you invest. This article is for informational and educational purposes only and does not constitute financial advice. Always do your own research and consider seeking independent advice before making any investment decision.

This article is for informational purposes only and does not constitute financial advice. Investment values can go down as well as up. Always do your own research before making any financial decisions.