ETF v praxi
CSPX (iShares Core S&P 500): ETF Review — Composition, TER, and Who It's For
Key takeaways
- CSPX tracks the S&P 500 index — 500 of the largest US equities weighted by market capitalisation.
- The fund is Irish-domiciled and accumulating (Acc) — dividends are automatically reinvested, which is advantageous for Czech tax residents.
- TER is approximately 0.07%, but always verify the current value on justETF — it is one of the lowest-cost UCITS funds on the market.
- High concentration in the US (100%) and the technology sector is the biggest risk — the fund is not globally diversified.
- Suitable as a core holding for an investor who consciously bets on the US market as the main engine of their portfolio.
CSPX is one of the most popular tickers in the portfolios of long-term investors across Europe. Behind this four-letter combination sits the iShares Core S&P 500 UCITS ETF — a fund tracking 500 of the largest US-listed companies, domiciled in Ireland, and designed to accumulate capital without ongoing dividend taxation. Let us take a closer look.
What index does CSPX track?
CSPX replicates the S&P 500 — one of the most closely watched and widely cited equity indices in the world. The index covers approximately 500 of the largest US companies listed on the NYSE or Nasdaq, weighted by market capitalisation. This means the largest companies (Apple, Microsoft, Nvidia, Amazon, Alphabet) carry a higher weight than smaller ones. If you want to understand what the S&P 500 actually is and how it works, read our guide to the S&P 500 index.
Irish domicile and accumulating share class
CSPX is domiciled in Ireland — not by accident. Ireland's tax treatment of UCITS ETFs is exceptionally favourable, particularly in relation to withholding tax on US dividends. For Czech investors, the Irish domicile is a strong argument. The details are explained in the article why UCITS ETF and Irish domicile. The fund is accumulating (Acc) — it does not pay dividends but automatically reinvests them back into the fund. This eliminates the need to pay tax on dividends as they are received and lets capital compound in full.
Who is CSPX suitable for?
CSPX is typically a core position for an investor who:
- Consciously bets on the US market as the main driver of their portfolio
- Prefers an accumulating share class with no ongoing dividends
- Wants low costs and liquidity on European exchanges
- Understands that the fund is 100% US — with no exposure to the rest of the world
A comparison of CSPX with alternative VUSA or broader global funds can be found in the article All-World vs. S&P 500.
Risks and concentration
The biggest risk of CSPX is its concentration risk. The fund invests 100% in the US. The technology sector makes up a large share of the index — Apple, Microsoft, Nvidia, Alphabet, Amazon, and Meta are among the largest positions. If the technology sector or the US economy goes through a correction, CSPX will feel it in full. For investors seeking true global diversification, CSPX alone is insufficient — it needs to be complemented by exposure to the rest of the world, or replaced by a global fund. We cover the concept of what an ETF is in our introductory guide what is an ETF.
Conclusion: a strong product with a clear profile
CSPX is an excellent product — low costs, Irish domicile, accumulating share class, physical replication. The question is not whether CSPX is a good ETF — it is. The question is whether you want 100% US exposure as the core of your portfolio. That is a conscious decision, not an automatic choice.
FAQ
What is the approximate TER of CSPX and where can I verify it?
CSPX's TER is approximately 0.07%, but always verify the current value on justETF or directly on the iShares website. Fees can be updated and the exact figure is essential for calculating long-term costs.
Is CSPX accumulating or distributing?
CSPX is accumulating (Acc) — it automatically reinvests dividends back into the fund. For Czech long-term investors in the accumulation phase, this is typically more advantageous than a distributing share class, which pays out dividends requiring taxation.
What is the difference between CSPX and VUSA?
Both funds track the S&P 500, both are Irish-domiciled UCITS ETFs. The main difference is that VUSA is distributing — it pays dividends — while CSPX is accumulating. Both have very low TERs. For a detailed comparison, see the VUSA review.