IWDA vs SPY ETF holdings comparison
iShares Core MSCI World UCITS ETF (USD Acc) (IWDA) · SPDR S&P 500 ETF Trust (SPY)
IWDA and SPY overlap by 69.3% by portfolio weight. The remaining 30.7 percentage points are not counted as shared holdings weight by this calculation. They share 437 stocks; the largest shared position is Nvidia (NVDA), contributing 5.53% to the overlap.
The holdings dates differ. This can slightly understate overlap for funds tracking similar indexes.
What this means
IWDA and SPY share a material portion of their portfolio weight in the same underlying stocks. OverlapCheck labels this "moderate holdings overlap" using house ranges of 70% or more, 30% to under 70%, and under 30%. These descriptive ranges are not industry standards or investment guidance. Holdings overlap does not measure correlation, volatility, geographic or factor exposure, fees, or suitability.
Overlap by weight sums the smaller of the two funds' weights for every stock they both hold. It answers "how much of my money is in the same stocks either way?" See methodology.
This comparison covers normalized equity positions represented in the dataset. Cash, derivatives, options, structured notes, and other non-equity assets are not included, so the result is not a complete comparison of every asset or risk in either fund.
Top shared holdings
| Company | Ticker | in IWDA | in SPY |
|---|---|---|---|
| Nvidia | NVDA | 5.53% | 8.22% |
| Apple | AAPL | 5.07% | 7.39% |
| Microsoft | MSFT | 3.90% | 5.57% |
| Amazon.Com Inc | AMZN | 2.74% | 3.79% |
| Alphabet Class A | GOOGL | 2.17% | 3.11% |
| Broadcom Inc | AVGO | 1.82% | 2.58% |
| Alphabet Class C | GOOG | 1.71% | 2.49% |
| Meta Platforms Class A | META | 1.37% | 2.44% |
| Micron Technology | MU | 1.18% | 1.76% |
| Tesla Inc | TSLA | 1.15% | 1.58% |
Holdings only in IWDA or SPY
IWDA has 774 fund-only positions representing approximately 30.6 percentage points of reported exposure; SPY has 66 fund-only positions representing approximately 2.7 percentage points of reported exposure. These are positions whose normalized security identifiers appear in one issuer file but not the other.
Largest positions only in IWDA
| Company | Ticker | Weight |
|---|---|---|
| Berkshire Hathaway Inc Class B | BRKB | 0.77% |
| Asml Holding | ASML | 0.71% |
| Hsbc Holdings Plc | HSBA | 0.38% |
| Roche Ps Par Ag | ROP | 0.33% |
| Royal Bank Of Canada | RY | 0.31% |
| Novartis Ag | NOVN | 0.30% |
| Shell Plc | SHEL | 0.28% |
| Mitsubishi Ufj Financial Group | 8306 | 0.27% |
| Astrazeneca Plc | AZN | 0.27% |
| Nestle Sa | NESN | 0.27% |
Largest positions only in SPY
| Company | Ticker | Weight |
|---|---|---|
| Berkshire Hathaway Inc Cl B | BRK.B | 1.40% |
| Moderna Inc | MRNA | 0.10% |
| Oneok Inc | OKE | 0.09% |
| Vivmark Residential | VMRK | 0.07% |
| Southwest Airlines Co | LUV | 0.03% |
| Viatris Inc | VTRS | 0.03% |
| Keycorp | KEY | 0.03% |
| Akamai Technologies Inc | AKAM | 0.03% |
| Zebra Technologies Corp Cl A | ZBRA | 0.03% |
| Revvity Inc | RVTY | 0.02% |
FAQ
How much do IWDA and SPY overlap?
IWDA and SPY have 69.3% overlap by weight, sharing 437 equity positions (out of 1211 in IWDA and 503 in SPY). The official holdings files used are dated 2026-08-31 for IWDA and 2026-09-21 for SPY.
What does 69.3% overlap mean?
IWDA and SPY share a material portion of their portfolio weight in the same underlying stocks. OverlapCheck labels this "moderate holdings overlap" using house ranges of 70% or more, 30% to under 70%, and under 30%. These descriptive ranges are not industry standards or investment guidance. Holdings overlap does not measure correlation, volatility, geographic or factor exposure, fees, or suitability.
Which stocks do IWDA and SPY both hold?
The largest shared positions are Nvidia, Apple, Microsoft, Amazon.Com Inc, Alphabet Class A. The top shared holdings with weights in each fund are shown on this page.
What holdings are different between IWDA and SPY?
IWDA has 774 positions not found in SPY, while SPY has 66 positions not found in IWDA. The largest fund-only positions and their weights are shown on this page.
Related comparisons
One side of this pair is a UCITS ETF. How share classes and listings map to one fund, and which popular UCITS combinations repeat the same US mega-caps, is covered in ETF overlap for European investors.