SIZEvsSPYETF Comparison
VS
iShares MSCI USA Size Factor ETF (SIZE) and State Street SPDR S&P 500 ETF Trust (SPY) belong to the same industry segment: US Large Cap. SIZE's top 3 sector exposures are Information Technology, Industrials and Financials. In contrast, SPY's top sector exposures are Information Technology, Financials and Communication Services. SIZE is more expensive with a Total Expense Ratio (TER) of 0.15%, versus 0.0945% for SPY. SIZE is up 5.03% year-to-date (YTD) with -$452K in YTD flows. SPY performs worse with 4.65% YTD performance, and -$18.27B in YTD flows. Run a side-by-side ETF comparison of SIZE and SPY below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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SIZE vs SPY performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 04/27/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | SIZE SPY | +8.35%+12.59% | +1.76%+2.59% | +5.03%+4.65% | +21.34%+30.59% | +52.85%+77.82% | +44.35%+82.69% |
| Flows | SIZE SPY | +$8M+$10.00B | -$452K-$2.85B | -$452K-$18.27B | +$31M-$12.00B | -$33M+$44.21B | -$715M+$70.46B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SIZE SPY | +14.49%+15.24% | +12.59%+12.45% | +14.67%+14.90% | +17.10%+16.92% |
| Max drawdown | SIZE SPY | -7.92%-8.88% | -7.92%-8.89% | -18.57%-18.74% | -24.05%-24.50% |
| Max drawdown duration | SIZE SPY | 49d75d | 49d76d | 219d126d | 820d708d |
Trading data
SIZE | SPY | |
Last sale 4/28/2026 at 7:36 PM | $167.89 | $711.44 |
| Previous close 04/28/2026 | $169.34 | $711.69 |
| Consolidated volume 04/28/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of March 31, 2026
1-year trailing difference
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SIZE | SPY | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 4/28/2026 at 7:36 PM
Live
Closed
SIZE | SPY | |
|---|---|---|
| Last price | $167.89 | $711.44 |
| 1D performance | -0.86% | -0.04% |
| AuM | $406.03 M | $724.29 B |
| E/R | 0.15% | 0.0945% |
Characteristics
SIZE | SPY | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | iShares | State Street Investment Management |
| Benchmark | MSCI USA Low Size Index | S&P 500 Index |
| N° of holdings | 503 | 478 |
| Asset class | Equities | Equities |
| Trailing 12m distribution yield | Join | Join |
| Inception date | April 16, 2013 | January 22, 1993 |
| ESG | No | No |
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Exposure
Countries
SIZE
USA
93.01%
Other
6.99%
SPY
USA
96.95%
Other
3.05%
Sectors
SIZE
Information Techn.
16.23%
Industrials
15.4%
Financials
12.22%
Health Care
9.66%
Consumer Discreti.
9.26%
Other
37.23%
SPY
Information Techn.
33.93%
Financials
10.39%
Communication Ser.
10.23%
Consumer Discreti.
10.01%
Health Care
9.32%
Industrials
8.33%
Other
17.78%
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Diversification
SIZE
Total weight of top 15 holdings out of 15
4.62%
SPY
Total weight of top 15 holdings out of 15
42.5%
Top 15 holdings
Data as of March 31, 2026
SIZE
DOW INC
0.37%
LYONDELLBASELL INDUSTRIES
0.37%
CIENA
0.36%
ECHOSTAR
0.33%
TERADYNE
0.32%
WESTERN DIGITAL
0.31%
CF INDUSTRIES HOLDINGS
0.31%
KEYSIGHT TECHNOLOGIES
0.29%
OCCIDENTAL U
0.29%
CORNING
0.28%
HALLIBURTON
0.28%
TARGA RESOURCS
0.28%
ENTEGRIS
0.28%
DEVON ENERGY
0.28%
TEXAS PACIFIC LAND CORP
0.28%
SPY
NVIDIA
7.58%
APPLE
6.66%
MICROSOFT-T
4.91%
AMAZON.COM INC
3.64%
ALPHABET INC-CL
2.99%
BROADCOM LIMITED
2.62%
ALPHABET INC-CL
2.40%
META PLATFORMS
2.24%
TESLA
1.87%
BERKSHIRE HATHWAY
1.57%
JPMORGAN CHASE
1.42%
LILLY
1.30%
EXXON
1.27%
JOHNSON&JOHNSON
1.05%
WALMART INC
0.97%
Frequently asked questions about SIZE and SPY
How have the SIZE and SPY ETFs performed in 2026?
As of April 27, 2026, SIZE is up 5.03% year-to-date (YTD), while SPY has returned 4.65%. That puts SIZE better performer ahead so far this year.
Which ETF is attracting more investor money: SIZE or SPY?
Year-to-date, the SIZE ETF saw -$452K in flows, compared to -$18.27B for SPY.
Which ETF is more volatile: SIZE or SPY?
Over the past year, SIZE had a volatility of 12.59%, while SPY experienced 12.45%.
Which ETF is bigger: SIZE or SPY?
As of April 27, 2026, SIZE holds $406.03 M in assets under management (AUM), while SPY manages $724.29 B.
What sectors do the SIZE and SPY ETFs invest in?
SIZE leans toward sectors like Information Technology, Industrials and Financials. Meanwhile, SPY focuses on Information Technology, Financials and Communication Services.
What are the top holdings of the SIZE ETF and SPY ETF?
SIZE top holdings include DOW INC, LYONDELLBASELL INDUSTRIES and CIENA. SPY holds in its top three: NVIDIA, APPLE and MICROSOFT-T.
Which ETF is more diversified: SIZE or SPY?
SIZE holds 538 securities with 4.62% of its assets in the top 15. SPY has 502 securities and a top 15 weight of 42.5%.
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