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Have you ever bought something at the grocery store, convinced you were completely out, only to discover you already had plenty at home?

That's why I currently have three unopened jars of almond butter in my pantry. (Don't judge me.)

The same accidental overlap can happen with your investments, specifically your ETFs.

ETFs, or exchange-traded funds, are pretty great. They're affordable, efficient, and, best of all, they instantly diversify your money. With a single click, you can buy a small slice of hundreds, even thousands, of companies.

But as with almond butter, you can have too much of a good thing. Buying a bunch of ETFs doesn't always mean more diversification. It could just mean buying more of the same companies, over and over again. Let's talk about how to spot ETF overlap, why it matters, and how to fix it.

Diversification 101: Why We Love ETFs

When you diversify, you spread your money across lots of different companies, industries, and asset classes. The idea is simple: If one sector crashes, your other investments help stabilize your portfolio.

ETFs make that easy. One fund can give you exposure to hundreds of stocks, whether it's the entire S&P 500 or international markets. But if you're holding a bunch of ETFs, you may be a lot less diversified than you think.

Too Much of a Good Thing? Yes, It Can Be a Problem With ETFs

Imagine you buy an ETF that tracks the S&P 500. Then, to add a little spice, you buy a popular total market ETF, followed by a technology ETF for good measure.

Feels diversified, right? Not exactly.

As of this writing, Apple, Nvidia, and Microsoft alone make up about 21% of SPY, a popular S&P 500 ETF. Your total market ETF holds those same companies at similar weights. And your technology ETF? Those three stocks account for about 45% of XLK, one of the biggest tech funds.

You now own Apple stock three times. (Sort of.)

Instead of a beautifully diversified portfolio, you've made a triple-decker sandwich of the same few stocks. That's a bigger issue than it used to be, because the S&P 500 has grown more top-heavy. Technology now makes up more than a third of the index, and its 10 largest companies account for close to 40%. So overlap doesn't just limit your diversification. It amplifies your risk. If big tech has a rough year, your whole portfolio will feel it.

To be clear, overlap isn't automatically a mistake. You may want extra exposure to tech. The problem is having that bet in your portfolio without realizing you made it.

How to Spot ETF Overlap (Without Losing Your Mind)

The good news is that you can quickly find out whether your ETFs overlap. (And it's much easier than organizing your pantry.) Here's how:

Check ETF holdings. Each ETF provider lists its fund's holdings on its website. If you compare two ETFs side by side and see similar names at the top, that's a red flag.

Use an ETF overlap tool. My personal favorite is ETF Research Center's Fund Overlap tool. You plug in two ETFs, and in seconds, it shows how much overlap you have. Other free overlap tools are available online, and your brokerage's research platform may offer portfolio analysis, too.

Let's take two popular ETFs: SPY, which tracks the S&P 500, and VTI, which tracks the total U.S. stock market. As of this writing, ETF Research Center's tool shows that 99% of SPY's holdings are also in VTI, and the two funds overlap by 88% by weight, which accounts for how much of each fund is invested in each stock. VTI holds roughly 3,000 additional stocks, but they make up a small slice of the fund. If you own both, you're essentially doubling down on the same companies.

Ouch.

What Real Diversification Actually Looks Like

Real diversification comes from having the right mix, not from having lots of funds.

Think of your portfolio like building a great salad: You want different colors, textures, and flavors. If your salad is just lettuce, spinach, and kale, you're still basically eating leaves. You need carrots, tomatoes, nuts, maybe some cheese, and definitely a good dressing. (Is anyone else hungry?)

A diversified ETF portfolio might look like this:

A U.S. large-cap ETF: VOO or SPY

An international stock ETF: VXUS or IXUS

A bond ETF: BND or AGG

Maybe something specialized: a real estate ETF like VNQ or a small-cap fund like VB

Each ETF here serves a clear role, with no excessive doubling up.

4 Simple Steps to Fix Your ETF Overlap Problem

Feeling overwhelmed? Don't. Fixing ETF overlap is straightforward.

1. Audit Your Portfolio

Spend five minutes plugging your ETFs into an overlap checker. You might be surprised.

2. Identify Gaps

Do you have international stocks? Bonds? Real estate exposure? If not, consider filling those gaps rather than buying more of the same.

3. Keep It Simple, and Watch for Taxes

You probably don't need a dozen different ETFs. Usually, three to five thoughtfully chosen funds cover your bases. Just don't rush to sell. Trades inside an IRA or 401(k) generally don't trigger taxes, but selling a winning ETF in a taxable brokerage account can mean a capital gains bill. In a taxable account, it's often cheaper to stop adding to the duplicate fund and direct new money toward your gaps.

4. Review Regularly

Checking your ETFs once a year can help you rebalance, stay diversified, and avoid creeping overlap.

Don't Stress, Just Check

ETFs are an amazing financial invention. But like everything amazing (tacos, puppies, almond butter), it's possible to have too much.

If your ETFs are secretly overlapping, don't stress. A quick portfolio audit, a little rebalancing, and some thoughtful choices are all it takes to get your investments back on track.

And hey, if anyone needs almond butter, you know who to call.