Best Russell 2000 ETF : US small caps, live comparison
How to pick a Russell 2000 ETF ? Comparison of funds (RS2K, 18MR, ZPRR), why overlap with an S&P 500 stays minimal, sector composition specific to US small caps, FAQ.
The Russell 2000 index in brief
The Russell 2000 tracks the 2,000 smallest capitalizations among the 3,000 largest US companies (Russell 3000). It is the reference index for US small caps, the classic complement to the S&P 500 (which represents large caps).
The average capitalization of a Russell 2000 component is around $1 to $2 billion, versus hundreds of billions for the S&P 500. Weighting is by free-float capitalization, giving more weight to the upper end of the range.
Sector-wise, the Russell 2000 is very different from the S&P 500 : healthcare (notably early-stage biotech), regional finance (local banks, specialized REITs) and industrials are over-represented. Mega-cap tech (Apple, Microsoft, NVIDIA) is entirely absent.
Comparison of available Russell 2000 ETFs
Data from our live database. The displayed TER is the annual management cost ; AUM represents assets under management.
Russell 2000 ETF rankings
Descriptive rankings computed on live data : fund size (assets under management) and listed fees (TER). Each criterion tells a different story : the largest is not always the cheapest.
Largest by AUM
Ranked by assets under management
- 1ZPRR4.5 B€
SPDR Russell 2000 US Small Cap UCITS ETF
- 21.0 B€
- 3730 M€
Why add the Russell 2000 to a portfolio
The classic rationale : overlap between a Russell 2000 and an S&P 500 is very low (under 5% in weight, by construction since the two indices complement each other). It is one of the few equity ETFs that brings true diversification to a portfolio already exposed to US large caps or MSCI World.
Historically, US small caps show volatility 5 to 8 points higher than the S&P 500, with more pronounced cyclical performance : better than large caps coming out of recessions, weaker in late-cycle phases.
The Russell 2000 includes a significant number of unprofitable companies (around 40% in some periods), notably in biotech and fintech. This characteristic amplifies its sensitivity to interest rates compared to the S&P 500.
Overlap between ETFs tracking the Russell 2000
When several ETFs track the same index, their overlap is mechanically very high. The matrix below computes the real overlap from current holdings (with physical proxy resolution for PEA-eligible synthetic ETFs).
Criteria to differentiate them
When overlap between two ETFs tracking the same index exceeds 95%, the following criteria become the actual differentiators.
Listed TER and compounded cost
Total Expense Ratio is deducted yearly from the fund's assets. Over 20 years, the gap between a 0.07% and 0.38% TER represents several thousand euros on a €50,000 investment, all else being equal.
Replication method
Physical replication directly holds the index securities. Synthetic replication uses a swap : a counterparty commits to deliver the index performance. Synthetics are required to make non-EU equity ETFs eligible for the French PEA.
PEA eligibility and proxy mechanism
A PEA-eligible synthetic ETF holds European equities (to satisfy the PEA quota) and receives the target index performance via swap. To compute real overlap, our tool resolves each synthetic to its reference physical ETF tracking the same index.
AUM and liquidity
High AUM (above €500M) typically ensures tight bid/ask spreads and a low fund closure probability. Very small ETFs (below €50M) carry a liquidation risk.
Listing currency and distribution policy
An ETF listed in USD with an EUR/USD hedge has an implicit hedging cost. A distributing (D) ETF pays dividends to the cash account ; an accumulating (C) ETF reinvests them automatically. Within the French PEA the taxation is unaffected ; in a standard brokerage account distribution triggers withholding tax.
Per tax wrapper
In PEA (French tax wrapper)
Russell 2000 ETFs available in Europe (Amundi RS2K, Amundi 18MR) are synthetic and PEA-eligible. As with other US synthetic equity ETFs, they hold a basket of European equities and sign a swap to deliver Russell 2000 performance.
Russell 2000 ETF AUM stays limited in Europe (typically a few hundred million euros), which can widen bid/ask spreads. Checking AUM in the table above helps select a fund with reasonable liquidity.
In a standard brokerage account
In a standard brokerage account, physical Russell 2000 ETFs (such as SPDR ZPRR) replicate the index by directly holding several hundred to over 1,000 lines (sampling replication). The TER is around 0.30% to 0.55%, higher than an S&P 500 ETF due to replication costs of a broader, less liquid index.
Dividend taxation is standard (capital income tax on CTO). Accumulating versions reinvest dividends ; distributing versions pay them (dividend yield around 1.5% on the Russell 2000, below the S&P 500).
Our Russell 2000 podium
Multi-criteria global ranking on 7 weighted criteria : TER, AUM, share price, 1Y performance vs peers, replication vs index, accumulating vs distributing, track record. Methodology detailed at the bottom of the block.
Amundi Russell 2000 UCITS ETF EUR (C)
Amundi Russell 2000 UCITS ETF USD
SPDR Russell 2000 US Small Cap UCITS ETF
Ranking methodology
Global score out of 100 computed from 7 weighted criteria, aggregated from the ETF Overlap live database. Synthetic and physical ETFs are scored on the same grid.
- TER (30%) : lower is better, normalized on the range observed for this index.
- AUM (25%) : assets under management, log scale to avoid crushing mid-sized ETFs.
- Track record (10%) : number of years since launch, normalized.
- Share price (10%) : lower is better. A low unit price (e.g. €5 for WPEA vs €640 for CW8) makes regular investments (DCA) easier and reduces order rounding friction.
- 1Y performance vs peers (10%) : 12-month gross performance ranked across all ETFs tracking the same index. Top performer scores 100, lowest scores 0. Computed from closing prices in our base.
- Replication vs index (10%) : distance to the pool median performance, used as a proxy for the index return. An ETF whose return drifts significantly above or below the median reflects looser replication (hedging, aggressive sampling, hidden costs). 100 = on median, 0 = maximum observed deviation.
- Accumulating vs distributing (5%) : 100 for accumulating ETFs (acc), 0 for distributing (dist). Accumulating reinvests dividends automatically and avoids annual dividend taxation in standard brokerage accounts.
This ranking is a multi-criteria synthesis, not a personalized recommendation. It depends on the freshness of AUM, TER, price and performance data in our base.
Frequently asked questions
Does the Russell 2000 overlap with an S&P 500 ETF ?
No, by construction. The Russell 2000 is defined as the 2,000 smallest capitalizations of the Russell 3000, that is those not in the S&P 500. Overlap between a Russell 2000 ETF and an S&P 500 ETF stays under 5%. It is one of the rare cases where adding an equity ETF to an already US-heavy portfolio brings real diversification.
Should you prefer the Russell 2000 or a Global Small Cap ETF ?
The Russell 2000 is pure US. An MSCI World Small Cap ETF covers small caps across 23 developed countries (US, Japan, Europe, etc.) with a US share around 55%. For an investor already heavily exposed to US via an S&P 500 or MSCI World, a Global Small Cap ETF diversifies more geographically.
Why does the Russell 2000 underperform the S&P 500 since 2010 ?
Several factors : (1) concentration on mega-cap tech has pulled the S&P 500 up, (2) a significant share of Russell 2000 components is unprofitable, weighing on weighted performance, (3) small caps are more sensitive to interest rates, and the 2022-2024 rate hike penalized the index. Historically, small caps outperforming phases (1999-2003, 2009-2014, 2020-2021) often follow stress periods.
Does the Russell 2000 include early-stage biotechs ?
Yes, about 15% to 20% of the index is composed of healthcare companies, with a significant share of clinical-stage biotechs (no stabilized revenues). This characteristic partly explains the high volatility and rate sensitivity : these companies depend on external financing.
What share of US small caps in a balanced portfolio ?
No universal weight exists. Academically, small caps represent about 8% to 10% of the total US market capitalization, so a market-neutral allocation would be around 8% of a US equity portfolio. Effective weights vary by investor convictions (from 0% to 25%). The ETF Overlap simulator helps check the impact of such an allocation on overall diversification.
Is the Russell 2000 a good proxy for the real US economy ?
This argument is often advanced : unlike the S&P 500 (whose constituents on average generate 40% of revenues outside the US), the Russell 2000 contains more locally focused companies, less internationally exposed. It is partly true for regional finance, local consumer goods and some industrials. But not for biotech and intermediate tech, which are globally exposed.
Check your ETF overlap
Enter two tickers to instantly see their overlap.
e.g. VWCE, CSPX, IWDA, EIMI…
More guides