Portfolios and riskBeginner

What is risk

Risk is not just that the price moves. It includes permanent loss, lack of liquidity, inadequate horizon and the possibility of forced selling when it is least convenient.

3 min read Practical guide

By the end

You will build a risk map with probability, impact and mitigation.

Volatility and loss

Volatility measures price dispersion; can inconvenience without destroying value. Permanent loss appears when the business, balance or price paid prevents the recovery of capital. Both matter if your horizon or tolerance forces you to sell.

Different risks

Separates business, financing, valuation, concentration, liquidity, currency, regulation and custody. The same event can activate several: a drop in demand reduces cash and makes it difficult to refinance.

Example

A company without debt can fall 40% due to valuation, but it has time. Another one with a near maturity can dilute shareholders even if its product is still good.

Capacity and tolerance

Capacity is how much you can lose without affecting objectives; tolerance, how much you emotionally endure. The smaller of the two should guide the size. The emergency fund does not belong in a volatile portfolio.

Manage

Diversify causes, limit positions, demand margin and review signals. Stops can control a trade, but they do not guarantee price or substitute analysis. Write what you would do before an adverse scenario.

Probability.

Impact.

Early sign.

Mitigation.

Maximum size.

From data to a decision

What can prevent the outcome?

This guide cannot predict the next move on its own. It can build a conditional reading: what supports upside, what increases downside risk, and which evidence must appear before acting.

Favourable reading

Risks are identifiable, financeable, and partly priced in.

Adverse reading

One event can destroy cash flow or force equity issuance.

Required confirmation

Estimate probability, impact, early signals, and response capacity.

Reasoned example

A 30% price fall alone does not measure risk; debt maturing without cash may.

Applied workshop

Turn the explanation into a process

Follow these steps in order and keep the result, so you can repeat the analysis and identify what changed your decision.

1List business, balance-sheet, valuation, liquidity, currency and behavioural risks.
2For each, define probability, impact, early indicator and possible response.
3Separate a temporary fall from permanent loss caused by debt, dilution or deterioration.
4Relate total risk to horizon, liquidity needs and maximum tolerable size.

Review questions

What can permanently destroy capital?
Which risk is shared by every holding?
Could you maintain the plan in the bear case?

Worked case

Business risk and portfolio risk

A biotech company can lose 80% if a trial fails. With 1% weight, the approximate maximum damage is 0.8% of portfolio. A company stable at 35% can cause more aggregate damage with 20% drop: 7%.

Probability, impact and weight act together. Includes liquidity and need to sell.

Decision rule

Manage total damage, not just individual volatility or apparent quality.

Put it into practice

Create a 3x3 matrix for an investment and assign a specific stock to each high risk.