Why Owning Too Many Stocks Can Hurt Your Investment Results

One of the most common misconceptions in investing is that more investments automatically mean better diversification.

Recently, I reviewed a new client’s taxable investment account that contained more than 250 individual holdings. While that might sound sophisticated on the surface, it actually created unnecessary complexity, tax challenges, and inefficiency.

The kicker is this account has been managed by a financial advisor. Sadly, I see this type of investing style often when reviewing professionally managed and self-managed portfolios.

Here’s what I wish more advisors and retail investors understood: The goal of investing isn’t to collect stocks. The goal is to grow wealth. At some point, adding more holdings stops improving diversification and simply creates clutter.

The Math Behind the Problem

Let’s look at a simple example:

Suppose you invest $500 in a stock that has an incredible year and gains 20%. That’s great, but your gain is only $100.

Now compare that to investing $25,000 in a broadly diversified ETF that gains just 5%. Your gain is $1,250.

Even though the ETF produced a much lower return percentage, the larger allocation generated significantly more dollars.

This is where many investors get distracted, chasing the next big winner while allocating very little capital to each idea. Even when they pick correctly, the impact on their overall wealth is often minimal.

The simple reality is this: small dollars invested produce small dollars in return.

The Diversification Myth

Research has shown that most of the diversification benefit of individual stocks is achieved with a relatively modest number of holdings. Once you own dozens of companies across different industries, adding hundreds more typically provides very little additional risk reduction.

Owning 250 positions isn’t necessarily five times more diversified than owning 50. Legendary investor Charlie Munger referred to this as the approach suited for “know-nothing” investors.

In many cases, it’s simply five times harder to manage. When your account looks like you’re trying to build your own mutual fund it becomes increasingly difficult to monitor, rebalance, and understand.

The Taxable Account Challenge

The problem becomes even more pronounced in taxable accounts. Every small holding creates a potential future tax decision.

When cash is needed for a large purchase, a charitable gift, a portfolio rebalance, or simply to simplify the account, every sale can trigger capital gains tax. With hundreds of positions, determining what to sell and how to do so tax-efficiently becomes much more complicated. This is the exact scenario the new client and I are now working to resolve.

Instead of controlling gains and losses intentionally, investors often find themselves selling entire positions because the holdings are too small to manage strategically.

Simplicity Is a Competitive Advantage

A well-constructed portfolio doesn’t need hundreds of investments. It needs a clear purpose.

For most investors, a thoughtfully designed portfolio built around a limited number of diversified holdings can provide broad market exposure, easier management, lower costs, and better tax efficiency.

When it comes to investing, complexity often masquerades as sophistication. More investments do not automatically lead to better outcomes. In fact, some of the most effective portfolios I’ve seen and built for clients are also some of the simplest.

A portfolio should be designed to help you reach your goals rather than creating unnecessary complexity, taxes, and administrative headaches. Sometimes the most valuable investment decision is simplifying what you already own. If you aren’t sure whether your portfolio is working efficiently, it may be time for a second opinion. We can help.

Disclosures

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