# Concentration Risk

> Concentration risk is the danger of having too much exposure to one asset, sector or idea. Learn how it hides in portfolios, how to measure it and how to limit it.

Source: https://learn.tradelabsai.com/risk/concentration-risk/  
Track: Risk Management · Level: Beginner · Updated: 2026-10-03  
Publisher: TradeLabs AI (https://tradelabsai.com). Education, not financial advice.  
Cite as: TradeLabs Learn, "Concentration Risk", https://learn.tradelabsai.com/risk/concentration-risk/

Concentration risk is the danger that comes from putting too much of your money or risk into a single asset, sector, theme or market. When that one thing goes wrong, the damage is large because nothing else offsets it. Concentration can come from a single big position, from many positions that are secretly the same bet, or from a whole strategy that depends on one market condition.

## Forms of concentration

| Form | Example |
|---|---|
| Single asset | Half of an account in one stock or one coin |
| Sector or industry | Several technology or bank stocks at once |
| Theme or factor | Positions that all need low interest rates or rising oil prices |
| Market or venue | All funds on one crypto exchange or with one broker |
| Strategy | Every trade is a breakout, so all lose in a choppy month |
| Direction | Everything long, nothing that benefits from a fall |

## How concentration causes large losses

**Example: One position, one bad day**
An investor holds $60,000 in a single company within a $100,000 portfolio. The company reports a failed product trial and the stock falls 45% overnight. The portfolio loses $27,000, 27%, in one day. A portfolio with the same company at 5% would have lost $2,250, 2.25%.

Concentration also caused some of history's biggest trading disasters. Archegos Capital held very large, leveraged positions in a handful of stocks; when they fell, forced selling turned losses into a collapse. See [Archegos Capital](https://learn.tradelabsai.com/history/archegos-capital/).

## Measuring concentration

- **Largest position as a share of the account.**
- **Top five positions as a share of the account.**
- **Exposure by sector, theme or currency.**
- **Share of total risk from each position,** which can differ from share of capital. A small volatile position can carry more risk than a large stable one. See [Risk Contribution and Risk Decomposition](https://learn.tradelabsai.com/portfolio/risk-contribution/).

## Setting limits

| Limit | Typical guideline |
|---|---|
| Single position size | 5% to 20% of capital, depending on volatility and strategy |
| Single position risk | 0.5% to 2% of the account to the stop |
| Sector or theme | 20% to 30% of capital, or a cap on combined risk |
| Single broker or exchange | Keep amounts within protection limits or spread across providers |

These are starting points. Concentrated strategies can work for experienced investors with deep research and a high tolerance for volatility, but the potential losses must be understood and sized.

## Concentration vs conviction

Some of the most successful investors run concentrated portfolios, and diversification can water down returns. The difference is intentional, researched concentration with clear risk limits, versus accidental concentration from many trades that turn out to be the same bet. For most traders, accidental concentration is the bigger danger. See [Diversification](https://learn.tradelabsai.com/portfolio/diversification/).

## Hidden concentration to watch for

- **Index funds that are themselves concentrated:** cap weighted indexes can have a large share in a few companies.
- **Correlated crypto holdings:** most altcoins move closely with Bitcoin in sell offs.
- **Employer stock** plus a job at the same company: both income and savings depend on one business.
- **Counterparty concentration:** too much money with one platform that could fail or freeze withdrawals. See [Market, Credit and Counterparty Risk](https://learn.tradelabsai.com/portfolio/counterparty-risk/).

## Common mistakes

- **Letting a winning position grow** into a dangerously large share without rebalancing. See [Rebalancing](https://learn.tradelabsai.com/portfolio/rebalancing/).
- **Counting positions** instead of independent bets.
- **Ignoring platform risk** in crypto and offshore brokers.

## Frequently asked questions

### What is concentration risk?

The risk of large losses from having too much exposure to a single asset, sector, theme, strategy or provider.

### How much should one position be?

It depends on volatility and strategy, but many traders keep single positions below 5% to 20% of capital and cap risk to the stop at 0.5% to 2%.

### Is diversification always better?

Not always for returns, but it reduces the chance that one event causes a large loss. Concentration should be deliberate and sized, not accidental.

Next, learn the number that tells you if a strategy makes money: [Expectancy](https://learn.tradelabsai.com/risk/expectancy/).

## Continue learning

- Next lesson: [Expectancy](https://learn.tradelabsai.com/risk/expectancy/)
- Previous lesson: [Portfolio Heat](https://learn.tradelabsai.com/risk/portfolio-heat/)
- Related: [Portfolio Heat](https://learn.tradelabsai.com/risk/portfolio-heat/): Portfolio heat is the total amount you would lose if every open position hit its stop. Learn how to calculate it, set limits and adjust for correlation.
- Related: [Diversification](https://learn.tradelabsai.com/portfolio/diversification/): Diversification lowers risk by combining assets that do not move together. Learn the maths, how many holdings you need, its limits in crises and common mistakes.
- Related: [Correlation-Adjusted Sizing](https://learn.tradelabsai.com/risk/correlation-adjusted-sizing/): Correlated positions can turn several small bets into one big one. Learn how correlation adds hidden risk, simple adjustment rules and portfolio methods.
- Related: [Position Sizing](https://learn.tradelabsai.com/risk/position-sizing/): Position sizing decides how many shares or contracts to trade so each loss stays small. Learn the formula, worked examples for each market and common mistakes.
- Related: [Archegos Capital](https://learn.tradelabsai.com/history/archegos-capital/): In March 2021, family office Archegos Capital collapsed, causing banks over $10 billion in losses. Learn how total return swaps hid its leverage and the lessons.