The iShares NASDAQ 100 UCITS ETF (CNDX, ISIN IE00B53SZB19) is how European investors buy the famous QQQ trade: the 100 largest non-financial companies on the Nasdaq, which in practice means the most concentrated mainstream bet on American big tech that exists in index form. At roughly $22 billion it’s the dominant UCITS vehicle for the index — and at 0.30% it charges a growth premium over plain S&P 500 funds that you should consciously decide to pay, not drift into.
I’ll say upfront what most reviews won’t: for many readers the honest answer is that they already own enough Nasdaq through their world or S&P 500 fund, and CNDX is a concentration tool, not a diversification one. Here’s the full picture, verified against iShares and justETF in August 2026.
CNDX key facts
| Fact | Detail |
|---|---|
| ISIN | IE00B53SZB19 (tickers CNDX London / SXRV Xetra) |
| TER | 0.30% per year |
| Index | Nasdaq-100 (100 largest non-financial Nasdaq listings) |
| Replication | Physical |
| Domicile | Ireland (UCITS) |
| Use of income | Accumulating |
| Fund size | ~$22bn (Aug 2026) |
What the Nasdaq-100 actually is — and isn’t
Common misconception first: it is not “the tech index.” It’s the 100 largest non-financial companies listed on the Nasdaq exchange — a listing-venue index that happens to be tech-dominated because that’s who lists there. You get the mega-cap platforms (Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta), plus non-tech Nasdaq residents like Costco and PepsiCo, and you don’t get tech giants listed on the NYSE. For a purer sector definition, the S&P 500 Information Technology sector fund is the cleaner instrument — the two solve different problems. For more detail, see our guide: Nasdaq-100 vs S&P 500.
This guide is part of our UCITS ETF comparison tool.
Concentration in numbers
The top ten routinely carry half the index or more. You are buying, in effect, eight platform monopolies with a ninety-company tail. In bull phases this is exactly why it outruns the S&P 500; in 2022-style de-ratings it’s why it falls ~1.3–1.5× as hard. Neither behavior is a malfunction — both are the product.
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CNDX vs the alternatives
vs an S&P 500 fund: ~85% of the Nasdaq-100 sits inside the S&P 500 anyway — CNDX is the same bet with the value sectors removed and the winners doubled. Decide whether you want more of what the S&P already gave you (SPY5 review).
vs a world fund: your MSCI World fund already holds every CNDX heavyweight at market weight. Adding CNDX turns a neutral position into an overweight — run the overlap before buying.
vs cheaper Nasdaq-100 UCITS rivals: Amundi and Invesco offer the index at lower TERs; CNDX answers with size and spread quality. On a long horizon the cheaper funds’ math wins if their tracking holds — check current TERs on justETF, as this corner of the market keeps repricing.
Taxes and buying
Irish accumulating UCITS boilerplate — which is a compliment: 15% internal US withholding, nothing to declare annually in most EU states until sale, Vorabpauschale/OeKB/Box 3 for DE/AT/NL respectively (UCITS guide, tax calculator). Buy SXRV on Xetra in euros or CNDX in USD on London; savings-plan eligible everywhere (setup guide). Dividend yield is minimal — this is a pure capital-growth instrument.
Who should own CNDX — my honest segmentation
- Reasonable: an investor with a diversified core who consciously wants a 5–15% tilt toward US platform economics and accepts 30–40% drawdowns as the toll.
- Questionable: anyone buying because of the last twelve months’ chart — the classic performance-chase entry that this index punishes hardest.
- Wrong tool: investors wanting “technology” specifically (take the sector fund) or diversification (take a world fund — this is the opposite).
Worked math on €50,000: a 10% CNDX sleeve (€5,000) at 0.30% costs €15/year — trivial. The real cost is behavioral: that sleeve will halve at some point in a decade. Pre-decide the response (hold or add), or don’t buy it.
What to watch through 2026–2027
Hyperscaler capex guidance — the same series that drives SMH drives CNDX’s top names’ earnings. Special rebalances: Nasdaq trims the index when top-weights breach caps — announcements move constituents briefly, holders needn’t act. Antitrust and AI-regulation dockets in the US and EU — platform economics are the fund; platform regulation is its tail risk.
Quick-start checklist
- Audit your existing Nasdaq exposure through world/S&P funds first.
- Choose a tilt size (5–15%) and write down your drawdown response.
- Compare live TERs of the Nasdaq-100 UCITS funds — the price war is ongoing.
- Buy the euro line (SXRV) or set a monthly plan; limit orders in core hours.
- Rebalance annually — a winning CNDX position quietly becomes your biggest risk.
Verdict
The definitive UCITS vehicle for a deliberate big-tech overweight: huge, liquid, cleanly built. Just be sure the decision is a portfolio decision and not a chart-chase — and if what you actually want is the whole market with tech at market weight, you already know which category to shop instead.
Common mistakes with Nasdaq-100 investing
- Buying the backtest. The chart everyone shares starts after 2009 — conveniently missing 2000–2002, when the index fell ~80% and needed fifteen years to reclaim its high. Both charts are true; only one is marketed.
- Calling it diversification. One hundred names where ten are half the fund is a concentration instrument. It diversifies nothing; it amplifies.
- Triple-stacking tech: world fund + S&P 500 + CNDX + a tech sector fund is one bet wearing four costumes, each with its own fee. Audit the overlap before adding the fourth costume.
- Improvising in the drawdown. This index will halve at some point in a long holding period. The investors who compound through it decided their response before buying — everyone else donates their shares to them at the bottom.
The platform-economics thesis, stated fairly
The intellectually honest case for CNDX isn’t “tech goes up” — it’s that a handful of firms achieved something historically rare: platforms with network effects, near-zero marginal costs, and self-reinforcing data advantages, now compounding through the AI cycle they largely own. Buying the Nasdaq-100 is buying that market structure with a built-in refresh mechanism as new platforms qualify. The equally honest counter: those economics are known, priced, and politically targeted — the EU’s DMA, US antitrust dockets and AI regulation all aim at exactly the moats you’re paying a premium for. When a thesis is both true and fully famous, expected returns compress. That tension — not a chart — is what your position size should express.
Three ways to hold it (and one way not to)
The measured tilt: 5–10% atop a world core — meaningful participation, survivable drawdowns, one annual rebalance. The default I’d defend for most conviction holders. The barbell: CNDX satellite against a deliberately defensive ballast (TDIV-style income or bonds) — concentrated growth and stability at the edges, nothing mushy in the middle. The savings-plan accumulator: fixed monthly amount through every regime — volatility becomes the friend that lowers average cost, discipline outsourced to automation (setup). The way not to: lump-summing after a 40% twelve-month run because the neighbor mentioned his returns — the single most reliable wealth-destruction pattern this index offers.
Reader scenarios
“I’m 100% CNDX — it’s outperformed everything for years. What’s wrong with that?” Nothing — until the regime turns, as it did in 2000 (−80%) and 2022 (−33%). A portfolio that’s one venue’s top hundred is an outcome bet, not a plan. Keep the conviction; add a core beneath it — even 60/40 world/CNDX transforms the risk math while keeping most of the upside participation.
“CNDX or just buying Nvidia and Microsoft directly?” The index’s refresh mechanism is the answer: today’s leaders weren’t 2005’s (no Nvidia in the top ranks, no Meta at all), and 2035’s may not be today’s. Single names cap your outcome at your own foresight; the index inherits whoever wins the venue.
“Is there a hedged version for euro investors?” EUR-hedged share classes exist across Nasdaq-100 UCITS funds — at extra cost and with the hedge resetting the growth story’s currency logic. For decade-scale holdings I skip hedging: equity volatility dwarfs FX, and hedge costs compound. For 2–3 year money — which shouldn’t be in this index anyway — the question answers itself.
“What monthly amount makes a savings plan worthwhile?” Any — from €25, execution is free at the neobrokers and fractional shares solve the unit price. The plan’s value is behavioral: it buys the 2022s automatically, which lump-sum psychology never manages.
What history’s two Nasdaq crashes actually teach
2000–2002 and 2022 get cited as the same lesson; they’re opposite ones. The dot-com collapse punished business-model fiction — most of that index’s high-fliers never earned their valuations and many never earned anything; recovery took fifteen years because the companies themselves were the problem. 2022 punished valuation excess on real businesses — the platforms kept compounding earnings straight through the drawdown, and recovery took two years. Today’s index resembles the second case: extraordinary businesses at demanding prices — which frames the real risk as multi-year multiple compression, not existential loss. That distinction should shape your response plan: in a 2022-type event, adding on schedule is rational; if the earnings themselves ever break — the true 2000 rhyme — the written exit condition earns its keep. Know which scenario you’re watching for; they don’t share a playbook.
One paragraph for three investor types
The performance chaser: the honest advice is to wait ninety days — if the urge to buy survives a quarter without the chart feeding it, it may be conviction rather than momentum. The systematic tilter: a fixed 5–10% CNDX sleeve, funded monthly, rebalanced annually — the only configuration in which this index has reliably rewarded retail holders through full cycles. The retiree tempted by growth: respect the sequence-of-returns math; a fund that can halve belongs to the decade-plus money, and the income side of the portfolio has better-suited tools.
Income variants of this index: investors who want the Nasdaq-100’s volatility converted into monthly cash rather than growth can compare the mechanical Global X covered-call version (QYLD) and the managed JPMorgan equity-premium-income route (JEPQ) — both reviewed with the ceiling costs stated honestly.
Considering derivatives instead? The index-futures route — e-minis, micros, margin and why buy-and-hold belongs in the wrapper — is covered in S&P 500 futures vs UCITS ETFs.
Chasing the giants specifically? The index’s top weights are the famous seven — the honest map of Mag-7 routes for Europeans (and why the US fund is blocked) is in the Magnificent 7 ETF guide; the quarterly-distribution alternative to this wrapper is reviewed in the EQQQ veteran’s guide.
Frequently asked questions
Is CNDX the European QQQ?
Functionally yes — same index, UCITS wrapper, Irish tax treatment, accumulating share class. QQQ itself isn’t sold to EU retail investors.
Why does the Nasdaq-100 exclude financials?
Index rules dating to its 1985 design — one more reason it’s a listing-venue index, not a sector definition.
CNDX or the S&P 500 IT sector fund?
CNDX = Nasdaq’s biggest names incl. non-tech; the IITU sector fund = pure GICS technology across all US exchanges. Purists want IITU; momentum-of-the-platforms buyers want CNDX.
Does CNDX pay dividends?
It accumulates, and the underlying yield is tiny anyway — growth is the entire proposition.
How badly can it fall?
History says 30–50%+ in serious de-ratings (2000–02 was far worse). Size the position so that number is survivable, and it becomes an opportunity instead of an exit.
How often does the Nasdaq-100 rebalance?
An annual December reconstitution handles membership, quarterly reviews adjust weights, and special rebalances trigger when concentration caps are breached — as happened in July 2023. Funds implement all of it automatically.
Is CNDX suitable inside a retirement portfolio?
As a satellite, yes — the accumulating Irish structure is ideal for long deferral. As the core of a near-retirement portfolio, no: sequence-of-returns risk and 40% drawdowns do not mix with withdrawal schedules. The closer to spending the money, the smaller this fund’s justified share.
Why is the CNDX fee higher than S&P 500 funds?
Less fee competition and a captive audience — Nasdaq-100 exposure has fewer substitutes than the crowded S&P segment, so pricing pressure arrived later. Rivals now undercut iShares; expect the gap to keep narrowing.
Cited sources: iShares fund data, justETF data, and Nasdaq index information. Verify current fund figures before investing. Educational content, not financial advice.
European UCITS/ETF investor with 11+ years building a global dividend and index portfolio, and founder of Financial Expert Class. I write every guide here from first-hand experience investing across EU brokers and tax regimes — not theory. More about me →