One of the first practical questions a new investor asks is how many stocks to hold. Too few, and one bad company can wreck the result. Too many, and the portfolio becomes impossible to follow and ends up behaving like an index anyway.
There is no single correct number, but there is a sensible range, and a few principles that matter more than the count itself. This article covers both.
Two kinds of risk
Every share carries two broad kinds of risk.
Market risk is the risk that the whole market falls — a recession, a crisis, a sharp change in interest rates. It affects nearly all shares together. Diversifying across more shares does not remove it.
Company-specific risk is the risk that one particular business does badly — a failed product, a fraud, heavy debt, losing a key customer, an industry in decline. It affects that company, and perhaps a few related ones, without affecting the rest of the market.
Diversification works on the second kind. By holding many companies, the failure of any one has a limited effect on the whole. Good news at one company tends to offset bad news at another.
So the question of how many stocks to hold is really the question of how much company-specific risk you are willing to carry. A portfolio of two or three shares is mostly a bet on those particular businesses. A portfolio of thirty is mostly a bet on the market, with a smaller tilt towards your choices.
This is also why concentrated portfolios produce both the best and the worst stories you hear. Holding fewer companies widens the range of possible outcomes in both directions; it does not, by itself, raise the average.
A sensible range
Research on diversification has generally found that the reduction in company-specific risk is large over the first ten to twenty holdings and then flattens out. Somewhere around a couple of dozen shares, spread across different industries, most of the benefit has been captured. Adding more after that changes the risk profile only slightly.
In practice, many individual investors who pick their own shares settle in a range of roughly fifteen to thirty. Fewer than that, and a single bad outcome can dominate. More than that, and the effort of following each company properly becomes difficult for somebody doing this part-time.
The right number for you also depends on how much time you have. Every holding needs to be understood when bought and reviewed at least once a year. If you cannot follow twenty-five companies, you do not really own twenty-five researched positions; you own a handful you know and many you are guessing about.
A quick illustration of why the count matters. In an equally weighted portfolio of five shares, one company falling sixty percent takes twelve percent off the whole portfolio. In an equally weighted portfolio of twenty-five shares, the same fall in one company takes off just over two percent. Nothing about the failing company changed — only how much of your money depended on it.
The more important point is the next one: the count means little if the holdings are similar.
Sectors matter as much as the count
Twenty shares in one industry are closer to a single bet than to twenty. Companies in the same sector usually respond to the same forces — commodity prices, regulation, interest rates, demand cycles. When the industry turns, they tend to fall together.
Good diversification spreads holdings across sectors whose fortunes depend on different things: financials, consumer goods, healthcare, industrials, technology, energy and so on.
Watch for hidden concentration too.
Your job. If you work in a particular industry, your salary already depends on it. Holding shares in the same industry doubles the exposure.
Your employer's stock. Employee stock plans can grow into a large share of a portfolio without any decision being made.
Funds plus shares. If you hold an index fund and also individual shares of its largest constituents, those companies may be a bigger part of your total than you realise.
Popular themes. A portfolio built around one theme — whatever is fashionable at the time — can look diversified by company name while being concentrated in one idea.
The cost of over-diversifying
Diversification has diminishing returns, and beyond a point it has costs.
Attention. With too many holdings, none of them gets the attention needed to notice when something has changed.
Diluted conviction. If you hold eighty shares, your best ideas have almost no effect on the result.
Index-like results with stock-picking costs. A very broad personal portfolio tends to behave like the market, while costing more in time, transactions and mistakes than simply buying an index fund.
If you find yourself wanting to hold a very large number of shares to feel safe, that is usually a sign that a low-cost index fund would do the job better.
A practical structure for beginners
Start with a diversified core. A low-cost index fund gives broad diversification immediately, without needing to research individual companies.
Add individual shares gradually around it, as you learn to analyse businesses. Each one should have a reason you could write in a sentence.
Limit any single holding. A common rule of thumb is that no one share should exceed around a tenth of your equity investments, and smaller for riskier companies.
Spread across sectors rather than collecting several companies in one industry.
Review once a year with one question for each holding: if I did not own this, would I buy it today at this price?
This structure keeps company-specific risk under control while leaving room to learn, and it scales naturally as knowledge and savings grow.
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Frequently Asked Questions
How many stocks should I own to be diversified?
Research has generally found that most company-specific risk is diversified away with a couple of dozen holdings across different industries. Many individual investors settle between roughly fifteen and thirty.
Does diversification remove all risk?
No. It reduces company-specific risk, but market risk, which affects nearly all shares together, remains however many you hold.
Can I be over-diversified?
Yes. Beyond a point, more holdings add little risk reduction, dilute your best ideas, and produce index-like results with higher effort and cost. A low-cost index fund may be a better choice.
Is it enough to hold many stocks in one sector?
No. Companies in the same industry tend to fall together. Spread holdings across sectors that depend on different forces.
What is a good maximum for a single stock?
A common rule of thumb is around a tenth of your equity investments, and less for riskier companies. Above that, one company's problems can dominate the result.
Related Reading
- The beginners course, for Kanpur
- Index funds against stock picking
- Diversifying across company sizes
- When employer stock piles up
- The yearly review of each holding
- Equity's place in the bigger picture
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
