ETF overlap and your exposure to one company

Calculate the company exposure in your own portfolio#

In this hypothetical example, you have a $10,000 portfolio. You hold $6,000 in Fund A, $3,000 in Fund B and $1,000 in shares of the same company. The company makes up 8% of Fund A and 12% of Fund B.

Fund A contributes $6,000 × 8%, or $480. Fund B contributes $3,000 × 12%, or $360. Adding the direct shares gives $1,840 of company exposure: 18.4% of the $10,000 portfolio.

Your account shows a 10% direct position. Another 8.4% sits inside the two funds. You can repeat this calculation for each company that appears in more than one holding.

The two funds in this example own the company shares. Your ETF units give you exposure to those holdings, alongside the shares you own directly.

Keep the percentages attached to their amounts#

The 8% and 12% fund weights use different denominators. Each describes the company as a share of that fund's assets. Adding them to your 10% direct position would produce 30%, which overstates the exposure in this example.

The sizes of your fund holdings matter. Fund A is 60% of your portfolio, so its contribution is 60% × 8% = 4.8%. Fund B contributes 30% × 12% = 3.6%. Add the direct 10% to reach 18.4%.

If you review only the two ETFs, the denominator becomes $9,000. Their combined $840 company exposure is 9.33% of that smaller portfolio. Write down which accounts and assets your total includes so you can compare the percentage consistently next time.

Find the holdings behind each fund#

Use the issuer's holdings list for the exact ETF you own. Check its identifier, the date of the list and the weight assigned to the company. Most US ETFs publish holdings on their websites daily, but confirm the date and coverage of the list you actually use. SEC ETF bulletin

A fund name or index label cannot establish that two portfolios are separate. A technology company could qualify for both a broad US index and a technology index. Both funds would then expose you to it, even though their names and investment remits differ. Check the holdings rather than treating different labels as proof of diversification. SEC guidance on index-fund diversification

Use current market values for your account holdings, with a common valuation date and currency. Original purchase amounts tell you what you spent; they will give a different picture after prices move or you add money.

A factsheet showing only the ten largest holdings cannot establish that another company is absent. If the available list covers only part of a fund, keep the uncovered portion visible in your calculation. Treat missing holdings as unknown rather than assigning them a zero weight.

This multiplication is a useful estimate for ordinary, unleveraged equity funds that hold shares. Funds using leverage or derivatives need a separate look at their exposure disclosures; a cash holding weight need not describe the full economic exposure.

If a fund owns another fund, multiply through both layers. In a separate hypothetical example, you hold $2,000 of Fund C. It puts 40% of its assets into Fund D, which puts 10% into the company. Your exposure through that route is $2,000 × 40% × 10% = $80. That is 4% of your Fund C holding, or 0.8% of a $10,000 portfolio. You still need to examine Fund C's remaining 60% and any direct company holding before calling $80 the total exposure.

What an overlap checker tells you#

A list of shared companies helps you find duplicates. A weighted fund-overlap figure describes how much two funds have in common under the tool's stated method. Your company-exposure calculation adds the amounts you personally hold, including direct shares.

Two people can own the same ETFs and have different exposure because they allocated different amounts to them. Using the same hypothetical Fund A and Fund B, but no direct company shares:

The fund pair is identical. The allocations change the company's contribution by $320, or 3.2 percentage points of the portfolio. When using a calculator, check whether it accepts your holding values or quantities, includes direct shares and shows the date and coverage of its holdings data.

Some funds hold different share classes of one company. Group them when reviewing exposure to the same business, while keeping the security identifiers in your record. Their voting rights and trading prices can differ.

Use the result to review the size of the position#

With 18.4% company exposure, a 20% fall in that company's share price would reduce the example portfolio by approximately $368, or 3.68%, if the other holdings stayed unchanged. This isolates that company's price movement. In an actual market decline, other holdings can move too.

Decide whether the combined position matches the amount you intended to commit to that business. Overlap can be deliberate, and a percentage alone cannot decide whether you should sell a fund. FINRA also identifies concentration across related companies and industries, so checking one company is only part of a portfolio review.

The exposure calculation tells you how much of the portfolio depends on the company. It does not establish how strong the company is or whether its shares are attractively priced. A company can be growing sales while customers pay more slowly, reducing the cash available to repay debt. Review its reported profit, cash collection, funding needs and the price you are paying for those prospects. Keep that business assessment separate from the arithmetic showing how much you already hold.