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Intermediate3 min readRisk and Portfolio Management · 6/11

Diversification: When It Reduces Risk and When It Becomes Clutter

Diversification means not depending on one company or one sector. But the number of stocks alone does not create it; what does is holding stocks that are not all hit by the same thing at the same time.

What you will learn

  • Know which kind of risk diversification reduces, and which it does not.
  • Tell real diversification from diversification in name only.
  • Recognise when too many stocks becomes clutter.
The lesson as a short video · 20 seconds · Watch on YouTube
In this lesson
  1. What exactly does it reduce?
  2. Diversification in name only
  3. When does it become clutter?
  4. Check yourself
  5. Summary
  6. Related terms

What exactly does it reduce?

Some risks belong to one company: poor results, a problem at a plant, a bad management decision. With all your money in that company, you take all the damage. Spread across different companies, one company's problem hits only part of the portfolio.

Other risks touch the whole market, such as a big change in interest rates or in economic conditions. Then many stocks fall together, and spreading across stocks does not stop it. Diversification reduces the damage; it does not remove it.

Diversification in name only

You can hold five stocks and not be diversified at all, if all five are in the same sector and react to the same news. That is really one bet split across five names.

Portfolio A5 stocks
Banks
100%
Portfolio B5 stocks
Banks
25%
Food
20%
Real estate
20%
Telecoms
20%
Pharma
15%
The same number of stocks, but portfolio B is spread across different sectors.
A worked exampleTwo portfolios, each EGP 100,000 in 5 stocks. A new decision hits the banking sector and its stocks fall 15%. Portfolio A is all banks and loses about 15,000. Portfolio B holds only 25% in banks, so its direct hit is about 3,750, if the other sectors are unaffected. The figures are invented for illustration.

When does it become clutter?

Every stock you hold needs its news and results followed. When the count grows until you no longer know why you own each one, or you buy any stock just "to diversify", that is clutter. There is no magic number; it depends on your time and ability to follow them.

Watch outDifferent sectors do not always mean different moves. In sharp falls, stocks from many sectors can drop together. Look at how the stocks actually moved together, not just at the sector names.

See how your portfolio is split

Record your positions in the portfolio and look at the risk panel for how they split across sectors.

PortfolioSectors

Check yourself

1. What does spreading across stocks protect against most?

One company's problem hits only a part; a market-wide fall touches many stocks together.

2. You hold 6 stocks, all in one sector. Is the portfolio diversified?

Diversification comes from what moves the stocks being different, not from their number.

Summary

  • Diversification reduces single-company and single-sector risk but not a market-wide fall.
  • Many stocks in one sector can be a single bet under several names.
  • When you no longer know why you hold each stock, diversification has become clutter.

Related terms

Market capEGX30

Related lessons

Trading on the Egyptian ExchangeEgyptian Market Sectors: How to Compare ThemRisk and Portfolio ManagementRebalancing a Portfolio
Previous · 05The Risk-Reward RatioNext · 07Stock Correlation: Why Stocks Move Together

Educational content only, not investment advice. Companies and figures in the examples are invented for illustration.