Kopi Notes Glossary
S&P 500 vs Nasdaq 100 ETF: Choosing Your US Market Exposure from Singapore
One tracks the broad US market across 500 companies; the other concentrates in 100 of the largest non-financial, mostly tech-heavy names.
Definition
An S&P 500 ETF tracks a broad, diversified index of roughly 500 large US companies across all major sectors, weighted by market capitalisation, while a Nasdaq 100 ETF tracks the 100 largest non-financial companies listed on the Nasdaq exchange, which results in a much heavier concentration in technology and growth-oriented stocks.
Not financial advice. All figures for educational reference only. Data as at August 2026. Last updated: August 2026.
Key Takeaways
- The S&P 500 spans all 11 GICS sectors including financials, healthcare, energy, and industrials, while the Nasdaq 100 excludes financial companies entirely and is heavily weighted toward technology, communication services, and consumer discretionary.
- Historically, the Nasdaq 100 has shown higher volatility and, over many periods, higher returns than the S&P 500, reflecting its concentration in high-growth technology names — but this also means sharper drawdowns during tech-sector corrections.
- Both indices are available to Singapore investors via SGX-listed ETFs, US-listed ETFs (via a broker with US market access), and Ireland-domiciled UCITS ETFs, each with different withholding tax and trading currency implications.
- The Nasdaq 100’s top 10 holdings typically make up a much larger share of the index (commonly 45-55%) compared to the S&P 500’s top 10 (commonly 30-38%), meaning single-stock concentration risk is materially higher in a Nasdaq 100 ETF.
- Many Singapore investors hold both as complementary building blocks — S&P 500 for broad market exposure, Nasdaq 100 as a targeted growth/technology tilt — rather than choosing one exclusively over the other.
Table of Contents
What Is an S&P 500 ETF?
An S&P 500 ETF is a fund that tracks the S&P 500 Index, which comprises approximately 500 of the largest publicly traded US companies selected by S&P Dow Jones Indices based on market capitalisation, liquidity, and profitability criteria, spanning all major sectors of the US economy. Because it’s weighted by free-float market capitalisation, the largest companies (frequently mega-cap technology names in recent years) still carry significant weight, but the index as a whole remains far more diversified across industries — including financials, healthcare, energy, industrials, and consumer staples — than a purely technology-focused benchmark.
The S&P 500 is widely regarded as the standard benchmark for the overall US stock market and is one of the most commonly referenced indices globally for measuring US equity market performance.
What Is a Nasdaq 100 ETF?
A Nasdaq 100 ETF tracks the Nasdaq-100 Index, which includes 100 of the largest non-financial companies listed on the Nasdaq Stock Exchange, ranked by market capitalisation. The explicit exclusion of financial companies (banks, insurers) is a defining structural feature, and because Nasdaq has historically been the preferred listing venue for many technology and internet companies, the resulting index is heavily concentrated in technology, communication services, and consumer discretionary sectors.
This concentration has historically made the Nasdaq 100 more volatile than the S&P 500, since its fortunes are more tied to a narrower set of industries and, at times, a small handful of mega-cap technology companies that can dominate index-level returns in either direction.
How Does This Work for a Singapore Investor?
Singapore investors can access both indices in several ways: SGX-listed ETFs (convenient for SGD trading and CPF Investment Scheme/SRS eligibility for some products), US-listed ETFs traded via a broker with US market access (typically the lowest expense ratios but subject to US estate tax exposure considerations and 30% dividend withholding tax for non-US individuals), or Ireland-domiciled UCITS ETFs listed on European or Asian exchanges (offering the reduced 15% US dividend withholding tax rate and no US estate tax exposure, a structure many Singapore investors specifically favour for long-term holdings).
Expense ratios for both index types have compressed significantly over the past decade; well-known US-domiciled S&P 500 and Nasdaq 100 ETFs often charge well under 0.20% p.a., while Ireland-domiciled UCITS equivalents (e.g. tracking similar indices) typically charge modestly higher expense ratios in exchange for the more favourable tax treatment for non-US investors.
The Nasdaq-100’s methodology also includes periodic rebalancing rules — including an annual reconstitution and quarterly weight adjustments designed to prevent any single company from dominating the index beyond certain thresholds — which somewhat tempers, but does not eliminate, its concentration relative to the S&P 500’s own market-cap weighting and periodic committee-based rebalancing. Both indices are reconstituted using rules-based methodologies rather than active manager discretion, which is a key reason ETFs tracking them can be offered at very low expense ratios compared to actively managed funds.
Worked Example
Consider a Singapore investor allocating S$20,000 to US equities and comparing full S&P 500 versus full Nasdaq 100 exposure over a hypothetical 10-year period:
- If US technology and growth stocks continue outperforming the broader market, the Nasdaq 100 allocation would likely show higher cumulative returns, but with noticeably larger peak-to-trough drawdowns during sector-specific downturns (as seen in periods like 2000–2002 and 2022).
- If market leadership broadens or rotates toward value, financials, energy, or healthcare, the S&P 500’s diversification would likely provide smoother, more resilient returns relative to a Nasdaq 100-only allocation.
- A blended approach — for example, 70% S&P 500 and 30% Nasdaq 100 — gives broad market exposure with a modest growth/technology tilt, without full concentration risk in either direction.
Advantages of Each Index
S&P 500 advantages: Broader sector diversification, lower single-stock concentration risk, widely considered the default benchmark for “the US stock market,” and typically lower volatility than the Nasdaq 100.
Nasdaq 100 advantages: Historically stronger returns during periods of technology sector leadership, direct exposure to many of the world’s largest and most innovative growth companies, and a well-established, liquid, long-track-record index.
Combining both lets investors calibrate their exact desired tilt toward growth/technology versus broad market diversification, rather than being forced into an all-or-nothing choice.
Risks and Limitations
Nasdaq 100 concentration risk. A small number of mega-cap technology companies can represent an outsized share of the index, meaning company-specific bad news can move the whole index significantly.
Sector-cycle risk. Both indices, but especially the Nasdaq 100, can underperform for extended periods when market leadership rotates away from their dominant sectors.
Currency risk. Both are USD-denominated exposures; SGD-based investors bear USD/SGD currency fluctuation risk unless using a currency-hedged share class (which carries its own hedging costs).
Domicile-driven tax and cost trade-offs — choosing between US-domiciled, Ireland UCITS, or SGX-listed versions involves weighing expense ratio, dividend withholding tax, liquidity, and estate tax exposure differently for each investor’s circumstances.
Valuation risk. Because both indices are market-cap weighted, periods where a handful of constituents trade at historically elevated valuations can leave the index more exposed to a sharp re-rating than a valuation-conscious active strategy might be, a consideration some investors address by pairing index exposure with periodic rebalancing into other asset classes rather than an ever-growing single allocation.
S&P 500 vs Nasdaq 100
| Feature | S&P 500 | Nasdaq 100 |
|---|---|---|
| Number of constituents | ~500 companies | 100 companies |
| Sector coverage | All 11 GICS sectors, including financials | Excludes financials; tech/growth-heavy |
| Typical top-10 weight | ~30–38% of index | ~45–55% of index |
| Historical volatility | Lower | Higher |
| Best suited for | Broad, diversified US market exposure | Targeted growth/technology tilt |
Source: S&P Dow Jones Indices; Nasdaq, Inc. index methodology documents.
Frequently Asked Questions
Which has performed better historically, the S&P 500 or Nasdaq 100?
Over many multi-year periods, particularly those favouring technology and growth stocks, the Nasdaq 100 has outperformed the S&P 500, but it has also experienced sharper drawdowns during technology-sector downturns — past performance of either index does not guarantee future results.
Can I hold both an S&P 500 ETF and a Nasdaq 100 ETF at the same time?
Yes, and many investors do — since the Nasdaq 100’s largest constituents typically overlap significantly with the S&P 500’s top holdings, holding both effectively increases your weighting toward those specific large technology companies relative to holding the S&P 500 alone.
Is a Nasdaq 100 ETF the same as a technology sector ETF?
No — while heavily weighted toward technology and growth companies, the Nasdaq 100 also includes companies from consumer discretionary, communication services, healthcare, and other sectors, whereas a dedicated technology sector ETF would exclusively track technology-classified companies.
Should Singapore investors choose a US-domiciled or Ireland-domiciled version?
This depends on individual circumstances, including US estate tax exposure concerns, dividend withholding tax preferences, and expense ratio trade-offs — many Singapore investors specifically favour Ireland-domiciled UCITS versions for long-term holdings due to more favourable tax treatment, but it’s worth comparing the specific products available.
Do SGX-listed S&P 500 or Nasdaq 100 ETFs exist for Singapore investors?
Yes, several SGX-listed ETFs provide exposure to US large-cap indices in SGD, offering convenience for CPF Investment Scheme or SRS-eligible accounts, though it’s worth comparing their expense ratios and underlying structure against US-listed or Ireland UCITS alternatives.