What is Diversification?
Diversifikatsiya
In short
Spreading money across many companies, sectors and assets so that one company's failure cannot do major damage to the whole portfolio.
Diversification all but removes company risk, but it does not protect against a broad market decline.
Diversification means spreading money across many companies, sectors and assets instead of one stock. The idea is simple: if one company collapses unexpectedly, it is only a small part of the portfolio, so the total damage stays limited.
Two kinds of risk
- Company risk — fraud, a bad report, a failed product. Diversification all but eliminates this risk.
- Market risk — the whole market falling (recession, crisis). Almost all stocks then fall together and diversification helps little.
Real and fake diversification
Ten stocks that all come from one industry (say, only chipmakers) behave in practice like one big position. What matters is not the number of stocks but how independently they move. The easiest route is a broad ETF, or a halal ETF for a halal approach.
The limit
Too many positions make tracking hard and simply push results toward the index. For most people a broad fund as the core plus a limited number of individual stocks is a balanced solution. Setting that split in advance is asset allocation.
The same event, three outcomes. Diversification turns one company's failure from a disaster into an inconvenience.
Example
A $10,000 portfolio, hypothetical numbers.
Option 1: everything in one stock. The company reports badly and the stock falls 50%. Loss: $5,000, 50% of the portfolio.
Option 2: $500 in each of 20 stocks. The same stock falls 50%. Loss: $500 × 50% = $250, only 2.5% of the portfolio.
Option 3: the whole market falls 20%. Now nearly all 20 stocks drop and the portfolio also loses roughly 20%. Diversification protected against company risk but not against market risk. See how much gain is needed to recover from a drop in the drawdown calculator.
Mistakes and tips
Count sectors, not tickers: 10 stocks in one sector is weak diversification.
If one position grows to a very large share of the portfolio (for example because it ran up), consider trimming it.
Diversification does not stop big market drops — you also need a cash buffer and sensible position sizing.
Frequently asked questions
- How many stocks should a portfolio have?
- There is no single right number. Many studies show that 15–30 stocks across different industries remove most company risk; a broad ETF gives you that in one purchase.
- Does diversification reduce returns?
- It dilutes the result of your single best stock, but also the damage from your worst. The goal is not maximum profit but protection from an unexpected blow-up.
Learn it in the Academy
This term is covered with hands-on examples and a quiz in these lessons of the interactive course.
- What a stock is and why its price movesA stock is a real slice of a business. IPOs, market cap, how price forms, where returns come from, and the risks.Open lesson · 11 min
- Long-term investing vs tradingCompounding, DCA with numbers, diversification and allocation, rebalancing, historical drawdowns and an investor's most expensive mistakes.Open lesson · 12 min
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