Positions & Risk
Basic4 Min Read
Risk Management: How Much, When
The one skill that decides not whether you win, but whether you stay in the game.
A beginner asks "what should I buy?" Someone who has survived a long time asks "how much should I buy?" The second question is less exciting, and it determines more of the outcome.
The Math of Asymmetry
Losses are not symmetric. The percentage you lose and the percentage you need to get back to even are not the same number:
This table alone explains why risk management is a necessity, not a preference. Keeping small losses small is easier than finding big winners — and contributes more to the result.
How Position Size Is Calculated
Professionals don't think in "how many shares." They go in this order:
- Decide what percent of your capital one idea may cost you. A common rule: never risk more than 1–2% of the total on a single idea.
- Decide where you'll admit you were wrong. That is the stop level.
- Divide the two.
That distinction is critical: position size and risk are not the same thing. Risk is the position size multiplied by the stop distance.
What Sets the Stop Distance
Not a round number — the stock's own character. Putting a 2% stop on a stock that swings 4% on an average day means "take me out of the market on an ordinary day." A volatile stock needs a wider stop and a smaller position. More: What Is Volatility?
The Four Common Mistakes
| Mistake | Why It's Wrong |
|---|---|
| Moving the Stop Down After a Drop | Handing the decision to fear. The loss no longer has a limit. |
| Adding to a Losing Position | Putting more money on the wrong idea. The average falls, the risk grows. |
| Closing Winners Early, Losers Late | Small profits, big losses. It runs the table above in reverse. |
| Concentrating in One Idea | One mistake can take half the capital. |
Planning to Lose
A good investor answers three questions before opening a position:
- If I'm wrong about this idea, how will I know?
- If I'm wrong, how much do I lose?
- When that loss happens, will I lose sleep?
If the answer to the third is "yes," the position is too big. That criterion is practical, not mathematical — and it is the most reliable one.
Your Place in the Guide
Article 16 of 49 in the GuideChapter 2 · Positions & Risk · Article 5 of 20
- 1. How to Buy US Stocks: Step by Step
- 2. What to Look for in a Broker
- 3. Order Types: Market, Limit and Stop
- 4. What Are Fractional Shares?
- 5. Risk Management: How Much, When
- 6. Dollar-Cost Averaging: What It Does and Doesn't Do
- 7. Moving From a Bank to a Broker: Türkiye's 17 June 2026 Ruling
- 8. W-8BEN and 1042-S: The US Tax Taken From Your Dividends
- 9. How Gains on Foreign Stocks Are Taxed in Türkiye
- 10. Irish ETF or US ETF?
- 11. Technical Views: What BUY, HOLD and SELL Mean
- 12. Diversification: How Many Baskets Are Enough?
- 13. What Do Long and Short Mean?
- 14. What Is Leverage — and Why You Should Stay Away
- 15. Investor Psychology: The Most Expensive Mistakes
- 16. What Is a 13F: How to Read Famous Investors' Portfolios
- 17. What Is a Short Squeeze?
- 18. Options: Calls, Puts and the Anatomy of a Premium
- 19. What the Options Market Prices: Implied Volatility and the Expected Move
- 20. Hedging: What Protection Costs