Small Caps

The cost of staying listed: why AIM can be expensive for tiny companies

The cost of staying listed: why AIM can be expensive for tiny companies. Use a sector-aware small-cap checklist to pressure-test funding, dilution,

By Cameron Oliver · June 3, 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.

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

The cost of staying listed: why AIM can be expensive for tiny companies 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.

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.