Small Caps

Small-cap sector checklist: questions before you invest

Small-cap sector checklist for biotech, tech, mining and oil and gas investors, with practical questions to test risk before investing.

By Cameron Oliver · May 23, 2026

Small-cap investing is where weak research gets punished fastest. The Little Book of Small-Caps is clear on one point: before you get excited about a story, you need a repeatable checklist that forces you to ask the uncomfortable questions.

Reviewed by Priya Nair, Editorial Director · May 23, 2026, 12:33

In this article

The Short Version

Use a sector checklist so you do not miss the most common small-cap failure modes.
Ask what can kill the thesis: dilution, regulation, commodity swings, customer churn or funding risk.
Separate what is knowable today from what is a hope about tomorrow.
This is educational research structure, not a recommendation to buy or sell any share.

Why a sector checklist beats generic advice

Before you invest in a small-cap, ask these questions, a sector-by-sector checklist for biotech, tech, mining and oil & gas sounds simple until you realise each sector hides its own traps. A checklist keeps you focused on evidence: what the company does, how it gets paid, what can break, and what has to go right for the valuation to make sense.

The book is not trying to turn you into an expert in every industry. It is trying to stop you from skipping the basics when the narrative feels exciting.

Biotech checklist: cash, trials, timelines

Biotech small-caps can look cheap right up until the next cash raise. Ask how many months of cash runway the company has at its current burn rate, what the next clinical milestone is, and what would make the next step fail.

Then ask the hard question: if the science works but funding dries up, what happens to existing shareholders?

Tech checklist: product proof, churn, unit economics

Tech small-caps often promise scale. Your checklist should test whether the product is real and repeatable. Look for evidence of retention, customer concentration risk, and whether margins improve as revenue grows.

If the story relies on new funding to reach profitability, treat dilution risk as part of the investment case.

Mining checklist: assets, funding, commodity risk

Mining small-caps are sensitive to commodity prices, permitting, and funding. Ask what the asset actually is: exploration hope, a development plan, or a producing operation. Then ask how it gets financed from here.

Be specific about what has to happen next: permits, capex, offtake, or a partner. If the plan depends on a higher commodity price, say that out loud in your notes.

Oil and gas checklist: declines, hedging, leverage

Oil and gas small-caps can move fast, in both directions. Your checklist should cover decline rates, lifting costs, hedging, and balance sheet pressure. Debt can look fine until the price tape changes.

If management talks more about price forecasts than operating resilience, treat that as a risk signal.

The cross-sector questions that still matter

No matter the sector, a small-cap checklist should answer four things: what the business does, how it funds itself, what breaks the thesis, and what would make you change your mind. The book’s edge is that it pushes you back to process when the narrative is loud.

A worked example: two small-caps, two different risks

Imagine two companies with the same market value. One is a biotech firm waiting for trial data. The other is a profitable software company trying to reduce customer churn.

The biotech checklist starts with cash, trial timing and the next funding need. The software checklist starts with revenue quality, retention and whether growth still costs too much to buy.

A generic checklist might call both companies speculative. A sector checklist tells you why they are speculative in different ways. That difference changes the questions you ask before you risk money.

How to turn answers into a decision record

A checklist only helps if you write down the answers before the share price moves. Record the facts you know, the assumptions you are making and the event that would prove you wrong.

For a miner, that event might be a failed permit or a funding gap. For a biotech company, it might be poor trial data. For a software company, it might be churn that keeps rising despite higher sales.

This does not remove risk. It makes the risk visible before excitement takes over.

Red flags that cut across every sector

Some warning signs matter whatever the company does. Frequent emergency fundraises, vague use of proceeds, missed milestones and promotional language all deserve attention.

So does management behaviour. If updates focus on excitement but avoid cash, margins, customer concentration or project delays, the checklist is telling you something useful.

The aim is not to find a perfect company. Small-caps are rarely tidy. The aim is to know which risks you are accepting and which risks you are only discovering after the price has moved.

How to compare companies in different sectors

A sector checklist also helps when two shares look impossible to compare. You are not comparing a biotech trial with a mining permit directly. You are comparing evidence quality, funding needs and downside if the next milestone fails.

That gives you a common language. You can ask which company has the clearest path to the next proof point, which one needs more capital, and which one leaves shareholders most exposed if conditions turn.

This is why the process matters more than the story. A strong story can still be a poor risk if the next step depends on funding, regulation or a commodity price the company cannot control.

A final check before you act

Before any small-cap decision, write down the one thing that would change your mind. If you cannot name it, you may be reacting to the story rather than analysing the business.

For a biotech, it might be trial data. For a miner, it might be permitting or financing. For a software company, it might be churn. For oil and gas, it might be production decline or leverage.

That single test gives the checklist teeth. It turns research from a collection of interesting facts into a decision record you can revisit later.

What This Means For You

If you plan to invest in a small-cap, write your checklist first, then fill it in. It is a defence against wishful thinking. If a company cannot answer the obvious sector questions, you have learned something valuable before risking money.

The practical benefit is focus: fewer stories, more evidence, and a clearer view of dilution and downside risk.

In Plain English

A sector checklist helps you avoid the classic small-cap mistakes. In biotech you watch cash and milestones. In tech you watch churn and unit economics. In mining you watch funding and commodity exposure. In oil and gas you watch declines, hedging and leverage.