BDBKX vs. SWSSX

Last updated Apr 1, 2026

Compare and contrast key facts about iShares Russell 2000 Small-Cap Index Fund Class K (BDBKX) and Schwab Small-Cap Index Fund-Select Shares (SWSSX).

BDBKX is a passively managed fund by iShares that tracks the performance of the Russell 2000 Index. It was launched on Apr 1, 2011. SWSSX is a passively managed fund by Charles Schwab that tracks the performance of the Russell 2000 Index. It was launched on May 19, 1997. Both BDBKX and SWSSX are passive ETFs, meaning that they are not actively managed but aim to replicate the performance of the underlying index as closely as possible.

Performance

BDBKX vs. SWSSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Russell 2000 Small-Cap Index Fund Class K (BDBKX) and Schwab Small-Cap Index Fund-Select Shares (SWSSX). The values are adjusted to include any dividend payments, if applicable.

BDBKX vs. SWSSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BDBKX iShares Russell 2000 Small-Cap Index Fund Class K	-2.46%	12.81%	11.40%	17.04%	-20.32%	14.59%	20.02%	25.66%	-11.01%	14.71%
SWSSX Schwab Small-Cap Index Fund-Select Shares	-2.49%	12.88%	11.57%	17.07%	-20.43%	14.77%	20.12%	25.63%	-11.19%	14.76%

Returns By Period

The year-to-date returns for both stocks are quite close, with BDBKX having a -2.46% return and SWSSX slightly lower at -2.49%. Both investments have delivered pretty close results over the past 10 years, with BDBKX having a 9.49% annualized return and SWSSX not far ahead at 9.50%.

BDBKX

• 1D: -1.43%
• 1M: -8.15%
• YTD: -2.46%
• 6M: -0.33%
• 1Y: 21.55%
• 3Y*: 11.76%
• 5Y*: 3.06%
• 10Y*: 9.49%

SWSSX

• 1D: -1.45%
• 1M: -8.18%
• YTD: -2.49%
• 6M: -0.36%
• 1Y: 21.55%
• 3Y*: 11.83%
• 5Y*: 3.10%
• 10Y*: 9.50%

*Multi-year figures are annualized to reflect compound growth (CAGR)

BDBKX vs. SWSSX - Expense Ratio Comparison

BDBKX has a 0.07% expense ratio, which is higher than SWSSX's 0.04% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

BDBKX

iShares Russell 2000 Small-Cap Index Fund Class K

SWSSX

Schwab Small-Cap Index Fund-Select Shares

Return for Risk

BDBKX vs. SWSSX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

BDBKX

BDBKX Risk / Return Rank: 46
BDBKX Sharpe Ratio Rank: 43
BDBKX Sortino Ratio Rank: 47
BDBKX Omega Ratio Rank: 36
BDBKX Calmar Ratio Rank: 54
BDBKX Martin Ratio Rank: 51

SWSSX

SWSSX Risk / Return Rank: 50
SWSSX Sharpe Ratio Rank: 47
SWSSX Sortino Ratio Rank: 52
SWSSX Omega Ratio Rank: 41
SWSSX Calmar Ratio Rank: 58
SWSSX Martin Ratio Rank: 52

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

BDBKX vs. SWSSX - 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 Schwab Small-Cap Index Fund-Select Shares (SWSSX). 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.

	BDBKX	SWSSX	Difference
Sharpe ratio Return per unit of total volatility	0.91	0.91	0.00
Sortino ratio Return per unit of downside risk	1.40	1.40	0.00
Omega ratio Gain probability vs. loss probability	1.18	1.18	0.00
Calmar ratio Return relative to maximum drawdown	1.33	1.33	0.00
Martin ratio Return relative to average drawdown	5.03	5.02	+0.01
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BDBKX vs. SWSSX - Sharpe Ratio Comparison

The current BDBKX Sharpe Ratio is 0.91, which is comparable to the SWSSX Sharpe Ratio of 0.91. The chart below compares the historical Sharpe Ratios of BDBKX and SWSSX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	BDBKX	SWSSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.91	0.91	0.00
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.13	0.14	-0.01
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.40	0.40	+0.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.38	0.33	+0.05

Correlation

The correlation between BDBKX and SWSSX is 0.99, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

BDBKX vs. SWSSX - Dividend Comparison

BDBKX's dividend yield for the trailing twelve months is around 3.25%, more than SWSSX's 1.32% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BDBKX iShares Russell 2000 Small-Cap Index Fund Class K	3.25%	3.17%	4.84%	2.96%	1.76%	7.67%	1.45%	3.47%	4.29%	3.18%	4.62%	3.64%
SWSSX Schwab Small-Cap Index Fund-Select Shares	1.32%	1.29%	1.66%	1.49%	1.32%	8.88%	2.55%	6.12%	10.45%	5.22%	4.10%	6.92%

Drawdowns

BDBKX vs. SWSSX - Drawdown Comparison

The maximum BDBKX drawdown since its inception was -41.66%, smaller than the maximum SWSSX drawdown of -60.34%. Use the drawdown chart below to compare losses from any high point for BDBKX and SWSSX.

Drawdown Indicators

	BDBKX	SWSSX	Difference
Max Drawdown Largest peak-to-trough decline	-41.66%	-60.34%	+18.68%
Max Drawdown (1Y) Largest decline over 1 year	-13.89%	-13.90%	+0.01%
Max Drawdown (5Y) Largest decline over 5 years	-31.96%	-31.93%	-0.03%
Max Drawdown (10Y) Largest decline over 10 years	-41.66%	-41.81%	+0.15%
Current Drawdown Current decline from peak	-10.97%	-11.00%	+0.03%
Average Drawdown Average peak-to-trough decline	-8.83%	-10.78%	+1.95%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.67%	3.68%	-0.01%

Volatility

BDBKX vs. SWSSX - Volatility Comparison

iShares Russell 2000 Small-Cap Index Fund Class K (BDBKX) and Schwab Small-Cap Index Fund-Select Shares (SWSSX) have volatilities of 6.59% and 6.59%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BDBKX	SWSSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.59%	6.59%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	14.10%	14.12%	-0.02%
Volatility (1Y) Calculated over the trailing 1-year period	23.12%	23.11%	+0.01%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.15%	22.57%	+0.58%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.65%	24.03%	-0.38%