Portfolio X-Ray Tool for ETFs and Mutual Funds

Updated September 26, 2026.

Three different fund names can still leave you owning the same company. A portfolio X-ray tool looks through ETFs and mutual funds to estimate the companies you own indirectly, then combines those exposures with your direct shares. The useful result is a dollar-weighted view of the portfolio you actually hold, with clear coverage and data dates.

Mezzi's Exposure X-Ray is included in its Free plan. Paid membership adds broader personalized guidance. Before choosing any X-ray tool, check whether it covers your exact funds, shows missing holdings, and lets you distinguish the investment portfolio from total household net worth. See Mezzi's current plans.

This guide explains the calculation, the questions to ask of a tool, and how to turn an exposure report into a decision without assuming that every overlapping fund should be sold.

What a portfolio X-ray should tell you

A statement might show three fund names and one stock. An X-ray should help answer a different question: how much of the selected portfolio depends on that company after looking inside the funds?

These outputs support a review; they do not establish that a portfolio is safe. Two funds can overlap substantially while still serving different roles in separate retirement plans or tax accounts.

FINRA's concentration-risk guidance explains why looking through fund holdings matters: owning several funds can still leave an investor dependent on the same investments or market segment.

A worked example: direct shares plus fund holdings

The following illustration uses fictional funds and a fictional company. The percentages are assumptions for teaching the calculation, not current holdings of a named ETF.

Suppose a household selects a $400,000 investment portfolio for review:

The calculation is:

Company exposure = direct shares + Σ(fund position value × company weight in that fund).

Here, $20,000 + ($150,000 × 6%) + ($100,000 × 10%) = $39,000. Divide by the selected portfolio's $400,000 value to get 9.75%.

The direct stock position alone is 5%. Looking through the funds reveals another 4.75 percentage points. Adding 6% and 10% would be wrong because those percentages describe different fund positions, not the whole household portfolio.

In a spreadsheet, use one row per direct or indirect exposure, multiply position value by the underlying weight, and sum the dollar contributions. Record the holdings date beside each weight. A reproducible report should let you trace the final number back to these inputs.

Choose the denominator before interpreting the percentage

Suppose the same household also has $100,000 in a checking and savings reserve. Company A remains $39,000 of exposure. It represents 9.75% of the selected investments or 7.8% of investments plus that reserve.

Neither percentage is inherently wrong. They answer different questions.

• Use the investment portfolio to assess how investment capital is allocated.
• Include available cash when reviewing household liquidity and near-term funding needs.
• Consider property and debts when discussing overall wealth, without treating an illiquid house as cash available for a brokerage loss.

A net-worth view can provide valuable context while making a stock concentration appear smaller. Keep the investment exposure visible alongside the broader household view. Label any comparison so that changing the denominator does not look like diversification.

Fund-of-funds analysis needs another layer

A target-date fund may own other funds rather than individual stocks. To estimate a company's contribution, multiply through each layer.

For an illustrative $100,000 target-date position, suppose 50% is allocated to an underlying domestic stock fund, and Company A is 6% of that underlying fund. The target-date position contributes:

$100,000 × 50% × 6% = $3,000 of Company A exposure.

If another underlying fund also owns Company A, calculate that contribution separately and add it. Do not count both the parent fund's value and the underlying holdings as extra household assets: they are two representations of the same invested money.

Coverage can vary for collective investment trusts, proprietary retirement-plan funds, private investments, derivatives, and unusual share classes. Ask whether the tool recognizes your specific security and how it handles an unavailable layer. An unidentified holding is an information gap, not evidence of zero exposure.

A five-part coverage check before you trust the result

Start with records, not the apparent precision of a chart.

1. Reconcile account values. Compare the selected accounts with recent statements. Check for omitted accounts, duplicated manual entries, and cash already counted elsewhere.
2. Check fund identification. Confirm the exact fund or share class. Similar names and retirement-plan labels can refer to different products.
3. Record holdings dates. A current market value does not guarantee that the underlying fund composition was disclosed today.
4. Locate uncovered holdings. Identify positions that the tool cannot look through. Keep their dollar value visible in the report.
5. Spot-check a large exposure. Use the fund issuer's holdings file and your position size to reproduce one company calculation.

A useful review log might say: “Accounts reconciled September 26; one retirement-plan trust unresolved; company weights use the stated issuer reporting dates.” That is more informative than an unqualified claim that every holding is always current.

If a tool does not display one of these details, ask support or verify it independently before relying on the output for a consequential transaction.

How Mezzi fits into the workflow

Exposure X-Ray is Mezzi's look-through feature for understanding underlying investment exposure across accounts. The practical starting point is to connect supported investment accounts, check their completeness, and review the exposure information available for the selected holdings.

Mezzi can also connect banking accounts, including checking and savings, and credit cards, and include assets such as manually entered real estate. Those details help frame the household decision. They do not turn property or a credit-card balance into fund holdings for an equity X-ray.

AI Personalization lets you add context such as goals, cash needs, preferences, and decision rules. For example, a stock position may look unusually large because you are waiting for a trading window, planning a charitable gift, or maintaining a deliberate allocation. Provide that context rather than asking the AI to infer it from balances.

An illustrative question is: “Show the direct and indirect sources of this company's exposure. Identify missing data. Compare using new contributions with selling appreciated shares, and state the assumptions.” This is a question you can ask, not a claim that every account will produce a complete answer.

Mezzi provides guidance; you review recommendations and implement investment transactions through the appropriate institution. Linking accounts does not by itself authorize automatic trading.

See direct and indirect ownership in Mezzi

Mezzi's February 2025 product walkthrough shows direct shares alongside additional exposure through ETFs. The historical screen below illustrates the calculation; its values and layout should not be read as current portfolio data.

Compare the tool with realistic alternatives

Mezzi is not the only way to examine underlying fund exposure.

Morningstar Investor advertises Portfolio X-Ray and offers a $249 annual or $34.95 monthly subscription as checked September 26, 2026. Compare the workflow you need, including fund research, account aggregation, broader household context, and ongoing guidance.

Overlap does not automatically multiply your expense ratio

Suppose you invest $50,000 in each of two funds, both charging 0.10% annually. The approximate annual fund cost is $50 + $50 = $100 on $100,000, or 0.10% overall.

Moving the entire amount into one fund charging 0.10% would still cost approximately $100. Fewer fund names do not automatically create a fee saving.

If a genuinely suitable alternative charges 0.03%, the approximate annual cost on $100,000 would be $30. The $70 difference comes from the lower expense ratio. Suitability, taxes, spreads, fund structure, and differences in exposure still matter. The SEC's fund-fee guidance explains how fund expenses affect investors.

An exposure report is not a wash-sale clearance

Two funds sharing stocks does not by itself establish that they are substantially identical for tax purposes. Likewise, continuing to hold a security in another account is not, by itself, the purchase that triggers a wash sale.

The IRS wash-sale rules concern qualifying replacement purchases within 30 days before or after a loss sale, with special consequences possible for IRA purchases. Transaction dates and facts matter. Do not infer a tax conclusion from an overlap percentage or assume a holdings report contains all relevant activity.

Before selling, verify cost basis, lots, holding periods, scheduled purchases, and activity in other relevant accounts. Get tax advice where the facts require it.

Turn the findings into a decision record

Use a short record for each material exposure: current dollars and percentage, chosen account scope, missing information, reason for holding it, desired change if any, and implementation constraints.

For the $39,000 Company A example, possible decisions include keeping the exposure deliberately, directing new contributions elsewhere, revisiting one fund's role, or considering a staged sale. None follows automatically from 9.75% alone. The important improvement is that the household knows the size and sources of the position before deciding. For a worked loss scenario and the arithmetic of diluting a position with new money, see our stock concentration guide.

Frequently asked questions

What is a portfolio X-ray tool?

It estimates the investments held inside funds and combines them with direct positions. Its usefulness depends on account completeness, fund coverage, holdings dates, and clear dollar-weighted calculations.

Is Mezzi Exposure X-Ray free?

Mezzi's pricing page includes risk analysis with X-Ray in Free. Advisory is $399 annually or $39 monthly; Concierge is $999 annually or $99 monthly. Paid memberships add broader advice and support. Check the current plan details before subscribing.

Does fund overlap mean I should sell a fund?

No. Overlap can be intentional, and funds may serve different account or investment roles. Review total exposure, costs, taxes, and the purpose of each holding before making a change.

Can X-ray analysis guarantee that every fund holding is included?

No universal guarantee should be assumed. Check the exact funds, data dates, missing holdings, and account connections. Look-through analysis is only as complete as the information available to it.