ETF comparison · Global core
CSPX vs IWDA: overlap by weight, TER & holdings
iShares Core S&P 500 UCITS ETF USD (Acc) vs iShares Core MSCI World UCITS ETF USD (Acc)
IWDA holds CSPX and then some: the S&P 500 is roughly two thirds of MSCI World by weight. Choosing between them is choosing how much non-US developed exposure you want.
CSPX also trades as SXR8 (Xetra), CSP1 (LSE (GBP)).
IWDA also trades as SWDA (LSE (GBP) / Milan), EUNL (Xetra).
CSPX vs IWDA at a glance
| CSPX | IWDA | |
|---|---|---|
| Fund | iShares Core S&P 500 UCITS ETF USD (Acc) | iShares Core MSCI World UCITS ETF USD (Acc) |
| ISIN | IE00B5BMR087 | IE00B4L5Y983 |
| Index | S&P 500 | MSCI World |
| Market exposure | US large cap | Developed markets |
| TER | 0.07% | 0.20% |
| Holdings in fund | 505 | 1,186 |
| Fund size | ≈ 110 bn USD | ≈ 120 bn USD |
| Domicile | Ireland | Ireland |
| Replication | Physical (full) | Physical (optimized sampling) |
| Use of income | Accumulating | Accumulating |
| Launched | May 19, 2010 | Sep 25, 2009 |
Top shared holdings
| CSPX | IWDA | |
|---|---|---|
| NVDANVIDIA | 7.85% | 5.66% |
| AAPLAPPLE | 7.44% | 5.47% |
| MSFTMICROSOFT | 5.64% | 3.86% |
| AMZNAMAZON.COM INC | 3.72% | 2.72% |
| GOOGLALPHABET CLASS A | 3.09% | 2.28% |
| AVGOBROADCOM INC | 2.45% | 1.79% |
| GOOGALPHABET CLASS C | 2.47% | 1.78% |
| METAMETA PLATFORMS CLASS A | 2.25% | 1.62% |
| MUMICRON TECHNOLOGY | 1.6% | 1.27% |
| TSLATESLA INC | 1.53% | 1.16% |
| JPMJPMORGAN CHASE & CO | 1.44% | 1.04% |
| LLYELI LILLY | 1.37% | 1.03% |
| AMDADVANCED MICRO DEVICES | 1.26% | 1.01% |
| BRK BBERKSHIRE HATHAWAY INC CLASS B | 1.45% | 0.8% |
| XOMEXXONMOBIL HOLDINGS CORP | 1.07% | 0.76% |
Weights per fund, normalized. 440 companies appear in both funds.
What the fee gap costs
Growth of 10,000 invested at 7% annual return, after each fund’s TER: 0.07% for CSPX, 0.20% for IWDA.
| CSPX | IWDA | Difference | |
|---|---|---|---|
| After 10 years | 19,543 | 19,307 | 236 |
| After 20 years | 38,194 | 37,276 | 918 |
| After 30 years | 74,643 | 71,968 | 2,675 |
CSPX comes out ahead by about 2,675 per 10,000 invested over 30 years. TER only. Trading spreads, taxes and broker fees are not included.
Where the portfolios differ
| Region | CSPX | IWDA |
|---|---|---|
| United States | 100.0% | 72.8% |
| Japan | 0.0% | 5.8% |
| United Kingdom | 0.0% | 3.5% |
| Canada | 0.0% | 3.4% |
| France | 0.0% | 2.3% |
| Switzerland | 0.0% | 2.1% |
| Germany | 0.0% | 2.1% |
| Australia | 0.0% | 1.6% |
| Sector | CSPX | IWDA |
|---|---|---|
| Information Technology | 37.7% | 30.6% |
| Financials | 12.2% | 16.2% |
| Industrials | 8.1% | 10.9% |
| Communication Services | 10.0% | 8.3% |
| Materials | 1.8% | 3.2% |
Only rows where the two funds differ by at least 1 percentage point.
Domicile and withholding tax
Both funds are domiciled in Ireland, so fund-level dividend withholding works the same way for both. Domicile does not separate this pair.
Frequently asked questions
Do CSPX and IWDA overlap?+
Yes: 71.27% by weight, with 440 holdings appearing in both funds. 98.85% of CSPX’s weight is also inside IWDA.
Do CSPX and IWDA track the same index?+
No. CSPX tracks the S&P 500 while IWDA tracks the MSCI World. The 71.27% overlap comes from companies that both indices include.
Which is cheaper, CSPX or IWDA?+
CSPX: 0.07% per year against 0.20% for IWDA. At 7% growth that gap is worth about 2,675 per 10,000 invested over 30 years.
Is it worth holding both CSPX and IWDA?+
Holding both mostly duplicates exposure: 71.27% of the pair overlaps by weight. Most investors pick one, or combine one of them with a fund covering different markets.
Why does CSPX hold the same companies at higher weights?+
Same companies, smaller universe: CSPX spreads its weight across 505 holdings while IWDA holds 1,186, so each shared position takes a larger slice of CSPX.
More comparisons
Methodology
Overlap is the sum of min(weight A, weight B) across holdings that appear in both funds, with each fund’s stored weights normalized to 100%. Holdings come from issuer feeds and regulatory filings in our ETF holdings database; TER and fund size come from fund profile data and are refreshed regularly. Figures update when the underlying holdings data updates.
Holdings data as of Sep 18, 2026, from our ETF holdings database.