Look through every ETF and fund
The ETF Holdings API breaks ETFs and funds down into the stocks, sectors, countries and currencies they hold. Give your customers a portfolio X-ray that shows where their money is really invested.
Example portfolio
- via MSCI World ETF
- via S&P 500 ETF
- held directly
Illustrative weights
One dataset, many names
ETF holdings, look-through and X-ray, explained
Banks call it look-through, apps call it X-ray, analysts call it a holdings breakdown. It all comes down to the same question: what is actually inside a fund, and what does that mean for the whole portfolio?
- ETF holdings
- The constituents of an ETF or fund: every stock, bond or other security it holds, with its weight. Also called the fund composition.
- Look-through
- Looking through a fund to the securities underneath, then adding them up across all funds and direct positions in a portfolio.
- X-ray
- The customer-facing view of a look-through: a portfolio X-ray shows the real exposure to companies, sectors, countries and currencies.
- Holdings breakdown
- Allocation by sector, country, region and currency, for a single fund or for a whole portfolio after the look-through.
- ETF overlap
- How much two or more funds hold the same securities. High overlap means less diversification than the number of funds suggests.
- Concentration risk
- A large share of a portfolio in a few companies, one sector or one country. Look-through data makes it measurable.
Why it matters
Diversified on paper, concentrated in reality
Many portfolios hold several broad ETFs and feel well diversified. Yet the largest indices are led by the same companies, so the real exposure to a few stocks, one sector or one currency is far higher than the position list suggests. Only a look-through makes that overlap and concentration risk visible.
MSCI World
Among the largest holdings
Applein all 3
Nvidiain all 3
Microsoftin all 3
S&P 500
Among the largest holdings
Nasdaq 100
Among the largest holdings
Apple, Nvidia and Microsoft rank among the largest holdings of the MSCI World, the S&P 500 and the Nasdaq 100 alike.
What you get
A complete holdings breakdown for every fund
Constituents with weights, plus sector, country and currency allocation, ready to render in your app. Every holding comes with its ISIN and a logo from the Elbstream Logo API.
iShares Core MSCI World UCITS ETF
ISIN IE00B4L5Y983 · Equity · Global developed markets
Top holdings
| Company | Weight |
|---|---|
Nvidia US67066G1040 | 5.5% |
Apple US0378331005 | 4.8% |
Microsoft US5949181045 | 4.4% |
Alphabet US02079K3059 | 3.5% |
Amazon US0231351067 | 2.8% |
Meta US30303M1027 | 1.9% |
Broadcom US11135F1012 | 1.6% |
Tesla US88160R1014 | 1.3% |
+ 1,300 more holdings
Sectors
- Information technology26.0%
- Financials16.0%
- Industrials11.0%
- Consumer discretionary10.0%
Countries
- United States72.0%
- Japan5.0%
- United Kingdom3.5%
Currencies
- US dollar73.0%
- Euro8.0%
- Japanese yen5.0%
Features
Everything you need for fund look-through
- Full holdings with weights
- Every constituent of an ETF or fund with its weight, not just the top ten, identified by ISIN.
- Portfolio look-through
- Send the positions of a portfolio and get the aggregated exposure across all funds and direct holdings.
- Sector, country & currency breakdowns
- Allocation by sector, country, region and currency, per fund and for the whole portfolio.
- Overlap analysis
- See how much funds overlap and which companies drive the overlap, for comparisons and switches.
- ETFs and mutual funds
- ETFs and mutual funds worldwide, from UCITS funds in Europe to US-listed ETFs, matched by ISIN.
- Logos for every holding
- Each holding links to its logo in the Elbstream Logo API, so a breakdown looks finished on day one.
How it works
From a list of ISINs to a full portfolio X-ray
- 1
Send the positions
Pass the ISINs and amounts of a portfolio, or a single fund ISIN.
- 2
We look through every fund
Each ETF and fund is broken down into its holdings and combined with the direct positions.
- 3
Render the X-ray
Get exposure by company, sector, country and currency, ready for charts, tables and alerts.
Use cases
Built for banks, brokers and wealth platforms
Depot X-ray in banking apps
Show customers what their depot really holds, right next to the position list in online banking and the app.
Advisory & suitability
Give advisers the true exposure of a client portfolio, including concentration and currency risk, in every meeting.
Robo-advisors & model portfolios
Check model portfolios for overlap and concentration before customers ever see them.
Fund pages & comparisons
Enrich ETF detail pages with holdings and breakdowns, and let users compare funds side by side.
Made and hosted in Germany
Financial data you can put in front of a compliance team
Elbstream is a German company. Our APIs and data are hosted in Germany, DORA- and GDPR-compliant, so banks and brokers in Europe can sign off quickly.
Security & compliance- Hosted in Germany
- APIs and data run on servers in Germany.
- German company
- Elbstream Data GmbH, Hamburg.
- DORA & GDPR
- Compliant, with no personal data processed.
- Support in English & German
- Talk to the team that builds the data.
Bring look-through to your customers
Banks, brokers and wealth platforms use the ETF Holdings API for look-through and portfolio X-rays. Tell us which funds and markets matter to you, and we will set you up.
Frequently asked questions
An ETF holdings API returns the constituents of ETFs and funds, the securities they hold and their weights, in a machine-readable format. The Elbstream ETF Holdings API adds sector, country and currency breakdowns and can look through whole portfolios.