Between buying large units of one stock & diversifying among many stocks with small amount which one is better?

For me, neither option is automatically better. It depends on your amount of money, your knowledge of the companies, your risk tolerance and your investment goal.

But if I were a beginner, I would generally prefer diversification rather than putting most of my money into one stock.

For example, imagine I have ₦100,000 to invest.

Option 1: I put the entire ₦100,000 into one company.

If that company performs very well, I could make a good return. But if the company has poor results, loses market value or something unexpected happens, a large part of my investment can fall at the same time.

Now imagine I divide the ₦100,000 among five companies:

– Company A: ₦20,000
– Company B: ₦20,000
– Company C: ₦20,000
– Company D: ₦20,000
– Company E: ₦20,000

If Company A falls by 30%, the damage to my entire portfolio is much smaller because only ₦20,000 was exposed to that company.

But diversification doesn’t mean buying 20 or 30 random stocks just because you want to have many companies.

That’s another mistake beginners can make.

For example, if I have only ₦50,000 and buy tiny amounts of 15 different stocks, I may end up owning many companies without actually understanding any of them.

I’d rather own a smaller number of investments that I understand properly, or use a properly managed diversified fund if I don’t yet have the knowledge or capital to build a portfolio myself.

There’s also an important difference between “large units” and “large amount of money.”

A ₦100 stock isn’t necessarily cheaper or better than a ₦1,000 stock simply because I can buy more units of it.

For example:

₦100,000 can buy 1,000 shares at ₦100 each.

It can also buy 100 shares at ₦1,000 each.

What matters is the value of the investment and the potential return, not simply the number of shares you own.

So I wouldn’t think:

“I want to own 10,000 shares.”

I’d think:

“I want to own good assets at sensible prices and manage my risk.”

There is one situation where concentrating in one stock can make sense: if an experienced investor has done extensive research, understands the business extremely well and deliberately accepts the higher risk.

But for someone still learning, I think diversification is generally the safer approach.

A realistic beginner approach could be:

₦100,000 available → ₦20,000 each across 4-5 carefully selected investments, or use a diversified fund rather than trying to pick many individual stocks.

And as the portfolio grows, you can gradually diversify across different sectors and asset classes, not just different companies.

So my simple answer would be:

Don’t chase the largest number of units. Don’t put all your money into one company simply because you believe it will perform well. Build a portfolio that can survive even when one investment doesn’t perform as expected.

The goal isn’t to find the one stock that will make you rich.

The goal is to build wealth without taking unnecessary risks that can set you back badly.