BDBKX vs. BSMAX
BDBKX (iShares Russell 2000 Small-Cap Index Fund Class K) and BSMAX (iShares Russell Small/Mid-Cap Index Fund Investor A Shares) are both Small Cap Blend Equities funds from iShares - BDBKX tracks the Russell 2000 Index while BSMAX tracks the Russell 2500 Index. Both are passively managed. Over the past 10 years, BDBKX returned 10.93%/yr vs 11.34%/yr for BSMAX. Their 0.98 correlation means they have historically moved very closely together. BDBKX charges 0.07%/yr vs 0.37%/yr for BSMAX.
Performance
BDBKX vs. BSMAX - Performance Comparison
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Returns By Period
The year-to-date returns for both stocks are quite close, with BDBKX having a 23.05% return and BSMAX slightly lower at 22.91%. Both investments have delivered pretty close results over the past 10 years, with BDBKX having a 10.93% annualized return and BSMAX not far ahead at 11.34%.
BDBKX
- 1D
- 1.86%
- 1M
- 0.97%
- 6M
- 16.28%
- YTD
- 23.05%
- 1Y
- 38.01%
- 3Y*
- 17.31%
- 5Y*
- 7.76%
- 10Y*
- 10.93%
- ALL TIME*
- 10.09%
BSMAX
- 1D
- -0.53%
- 1M
- 0.80%
- 6M
- 15.93%
- YTD
- 22.91%
- 1Y
- 34.04%
- 3Y*
- 17.14%
- 5Y*
- 8.25%
- 10Y*
- 11.34%
- ALL TIME*
- 10.64%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
BDBKX vs. BSMAX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
BDBKX iShares Russell 2000 Small-Cap Index Fund Class K | 23.05% | 12.81% | 11.40% | 17.04% | -20.32% | 14.59% | 20.02% | 25.66% | -11.01% | 14.71% |
BSMAX iShares Russell Small/Mid-Cap Index Fund Investor A Shares | 22.91% | 11.59% | 11.78% | 16.81% | -18.58% | 17.69% | 20.06% | 27.38% | -10.45% | 16.40% |
Correlation
The correlation between BDBKX and BSMAX is 0.98 - they have historically moved very closely together. At this level, their price movements offset little of one another.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.98 |
Correlation (3Y) Balances recent behavior with more history. | 0.98 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.98 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.98 |
Correlation (All Time) Calculated using the full available price history since Aug 13, 2015 | 0.98 |
The correlation between BDBKX and BSMAX has been stable across timeframes, ranging from 0.98 to 0.98 - a consistent structural relationship.
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Return for Risk
BDBKX vs. BSMAX — Risk / Return Rank
BDBKX
BSMAX
BDBKX vs. BSMAX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares Russell 2000 Small-Cap Index Fund Class K (BDBKX) and iShares Russell Small/Mid-Cap Index Fund Investor A Shares (BSMAX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| BDBKX | BSMAX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.10 | ||
| Sortino ratioReturn per unit of downside risk | +0.10 | ||
| Omega ratioGain probability vs. loss probability | 1.34 | 1.33 | +0.01 |
| Calmar ratioReturn relative to maximum drawdown | 3.56 | 3.61 | -0.06 |
| Martin ratioReturn relative to average drawdown | 12.62 | 13.66 | -1.04 |
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Drawdowns
BDBKX vs. BSMAX - Drawdown Comparison
The maximum BDBKX drawdown since its inception was -41.66%, roughly equal to the maximum BSMAX drawdown of -41.38%. Use the drawdown chart below to compare losses from any high point for BDBKX and BSMAX.
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Drawdown Indicators
| BDBKX | BSMAX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -41.66% | -41.38% | -0.28% |
Max Drawdown (1Y)Largest decline over 1 year | -10.97% | -9.46% | -1.51% |
Max Drawdown (3Y)Largest decline over 3 years | -27.53% | -25.54% | -1.99% |
Max Drawdown (5Y)Largest decline over 5 years | -31.96% | -28.48% | -3.48% |
Max Drawdown (10Y)Largest decline over 10 years | -41.66% | -41.38% | -0.28% |
Current DrawdownCurrent decline from peak | 0.00% | -0.53% | +0.53% |
Average DrawdownAverage peak-to-trough decline | -8.66% | -7.61% | -1.05% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 3.09% | 2.50% | +0.59% |
Volatility
BDBKX vs. BSMAX - Volatility Comparison
iShares Russell 2000 Small-Cap Index Fund Class K (BDBKX) has a higher volatility of 4.57% compared to iShares Russell Small/Mid-Cap Index Fund Investor A Shares (BSMAX) at 4.17%. This indicates that BDBKX's price experiences larger fluctuations and is considered to be riskier than BSMAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| BDBKX | BSMAX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.57% | 4.17% | +0.40% |
Volatility (6M)Calculated over the trailing 6-month period | 14.19% | 13.58% | +0.61% |
Volatility (1Y)Calculated over the trailing 1-year period | 19.36% | 17.75% | +1.61% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 23.15% | 21.00% | +2.15% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 23.69% | 21.59% | +2.10% |
BDBKX vs. BSMAX - Expense Ratio Comparison
BDBKX has a 0.07% expense ratio, which is lower than BSMAX's 0.37% expense ratio.
Dividends
BDBKX vs. BSMAX - Dividend Comparison
BDBKX's dividend yield for the trailing twelve months is around 2.65%, more than BSMAX's 2.19% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BDBKX iShares Russell 2000 Small-Cap Index Fund Class K | 2.65% | 3.17% | 4.84% | 2.96% | 1.76% | 7.67% | 1.45% | 3.47% | 4.29% | 3.18% | 4.62% | 3.64% |
BSMAX iShares Russell Small/Mid-Cap Index Fund Investor A Shares | 2.19% | 2.67% | 1.79% | 1.14% | 4.67% | 4.55% | 4.26% | 2.62% | 4.07% | 2.61% | 1.34% | 0.59% |
Frequently Asked Questions
With a correlation of 0.98, BDBKX and BSMAX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
BDBKX has higher volatility (4.57%) compared to BSMAX (4.17%). In terms of maximum drawdown, BDBKX dropped -41.66% vs BSMAX's -41.38%.
BDBKX currently has the higher Sharpe Ratio (2.03 vs 1.93), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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