position sizing
Position sizing is deciding how much money to put into one investment so that if it goes wrong, it does not wreck your whole portfolio.
In plain English
Every Nigerian who has ever put money into a business idea from an uncle knows this feeling: you hear about something promising, and the temptation is to throw in everything you have because you are sure this one will not fail.
Position sizing is the discipline that stops you from doing that. It simply means deciding, before you invest, how much of your total money you will risk on one stock, one crypto coin, or one business, so that a single bad outcome does not take you out of the game entirely.
Say you have ₦2,000,000 saved up and you hear that a certain stock on the Nigerian Exchange is about to double. Excitement says put in all ₦2,000,000. Position sizing says maybe ₦200,000, which is ten percent of your money, so that if the stock falls instead of rising, you still have ₦1,800,000 to work with and to learn from.
People in the United Kingdom investing through apps like Trading 212 or Freetrade run into the same test. A tempting tip on a small cap stock can eat an entire month's contribution if there is no rule guiding how much goes in.
Diaspora investors sending money home to fund a relative's business or buying shares back in Nigeria face this too. The amount you commit to any one opportunity should depend on how sure you are and how much pain you can absorb if you are wrong, not on how excited you feel that week.
The size of the bet matters more than most people admit. Being right about a stock means little if you put in so much that being wrong once would have finished you.
You have ₦1,000,000 to invest. You decide no single stock will get more than 15 percent of that, so each position is capped at ₦150,000. A stock tip comes in that feels irresistible, but your rule still limits it to ₦150,000, protecting the other ₦850,000 if it fails.
Questions people ask
What is a good position size for a beginner?
Many experienced investors suggest not putting more than five to ten percent of your total investable money into a single stock or asset when you are starting out, so that no single mistake ends your investing path before it properly begins.
Does position sizing apply to savings and businesses too, more than stocks?
Yes. The same thinking applies to how much you commit to one side business, one round of crypto, or one friend's investment scheme. Spreading your commitment protects you the same way it protects a stock portfolio.
How do I decide the exact percentage to use?
It depends on how confident you are in the investment, how easily you could recover the money if it is lost, and how many other opportunities you are choosing between. Riskier or less certain bets should always get a smaller slice.
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