SIMO vs. SPY

Last updated Jun 23, 2026

SIMO (Silicon Motion Technology Corporation) is a stock, while SPY (State Street SPDR S&P 500 ETF) is S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, SIMO returned 25.55%/yr vs 15.70%/yr for SPY. At a 0.42 correlation, their price movements are largely independent.

Performance

SIMO vs. SPY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Silicon Motion Technology Corporation (SIMO) and State Street SPDR S&P 500 ETF (SPY). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SIMO achieves a 265.57% return, which is significantly higher than SPY's 9.74% return. Over the past 10 years, SIMO has outperformed SPY with an annualized return of 25.55%, while SPY has yielded a comparatively lower 15.70% annualized return.

SIMO

• 1D: 4.74%
• 1M: 22.00%
• YTD: 265.57%
• 6M: 278.42%
• 1Y: 390.40%
• 3Y*: 71.51%
• 5Y*: 42.63%
• 10Y*: 25.55%

SPY

• 1D: -0.31%
• 1M: 0.09%
• YTD: 9.74%
• 6M: 9.27%
• 1Y: 26.65%
• 3Y*: 21.27%
• 5Y*: 13.51%
• 10Y*: 15.70%

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

SIMO vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SIMO Silicon Motion Technology Corporation	265.57%	76.91%	-8.94%	-4.91%	-30.38%	101.83%	-1.81%	51.81%	-33.11%	27.14%
SPY State Street SPDR S&P 500 ETF	9.74%	17.72%	24.89%	26.18%	-18.18%	28.73%	18.33%	31.22%	-4.57%	21.71%

Correlation

The correlation between SIMO and SPY is 0.49, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.49
Correlation (3Y) Calculated over the trailing 3-year period	0.50
Correlation (5Y) Calculated over the trailing 5-year period	0.47
Correlation (10Y) Calculated over the trailing 10-year period	0.45
Correlation (All Time) Calculated using the full available price history since Jun 30, 2005	0.42

Return for Risk

SIMO vs. SPY — Risk / Return Rank

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

SIMO

SIMO Risk / Return Rank: 99
SIMO Sharpe Ratio Rank: 99
SIMO Sortino Ratio Rank: 98
SIMO Omega Ratio Rank: 98
SIMO Calmar Ratio Rank: 99
SIMO Martin Ratio Rank: 99

SPY

SPY Risk / Return Rank: 68
SPY Sharpe Ratio Rank: 69
SPY Sortino Ratio Rank: 66
SPY Omega Ratio Rank: 68
SPY Calmar Ratio Rank: 63
SPY Martin Ratio Rank: 74

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.

SIMO vs. SPY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Silicon Motion Technology Corporation (SIMO) and State Street SPDR S&P 500 ETF (SPY). 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.

	SIMO	SPY	Difference
Sharpe ratio: Return per unit of total volatility	5.56	2.16	+3.41
Sortino ratio: Return per unit of downside risk	5.58	2.91	+2.67
Omega ratio: Gain probability vs. loss probability	1.74	1.39	+0.35
Calmar ratio: Return relative to maximum drawdown	14.98	3.01	+11.97
Martin ratio: Return relative to average drawdown	44.25	13.54	+30.71

SIMO vs. SPY - Sharpe Ratio Comparison

The current SIMO Sharpe Ratio is 5.56, which is higher than the SPY Sharpe Ratio of 2.16. The chart below compares the historical Sharpe Ratios of SIMO and SPY, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

SIMO vs. SPY - Drawdown Comparison

The maximum SIMO drawdown since its inception was -93.19%, which is greater than SPY's maximum drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for SIMO and SPY.

Drawdown Indicators

	SIMO	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-93.19%	-55.19%	-38.00%
Max Drawdown (1Y) Largest decline over 1 year	-26.26%	-8.88%	-17.38%
Max Drawdown (3Y) Largest decline over 3 years	-52.84%	-18.76%	-34.08%
Max Drawdown (5Y) Largest decline over 5 years	-56.49%	-24.50%	-31.99%
Max Drawdown (10Y) Largest decline over 10 years	-56.49%	-33.72%	-22.77%
Current Drawdown Current decline from peak	0.00%	-1.75%	+1.75%
Average Drawdown Average peak-to-trough decline	-32.33%	-9.04%	-23.29%
Ulcer Index Depth and duration of drawdowns from previous peaks	8.88%	1.97%	+6.91%

Volatility

SIMO vs. SPY - Volatility Comparison

Silicon Motion Technology Corporation (SIMO) has a higher volatility of 24.54% compared to State Street SPDR S&P 500 ETF (SPY) at 4.64%. This indicates that SIMO's price experiences larger fluctuations and is considered to be riskier than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SIMO	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	24.54%	4.64%	+19.90%
Volatility (6M) Calculated over the trailing 6-month period	58.23%	9.75%	+48.48%
Volatility (1Y) Calculated over the trailing 1-year period	70.87%	12.43%	+58.44%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	50.61%	17.14%	+33.47%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	45.39%	17.99%	+27.40%

Dividends

SIMO vs. SPY - Dividend Comparison

SIMO's dividend yield for the trailing twelve months is around 0.59%, less than SPY's 1.01% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SIMO Silicon Motion Technology Corporation	0.59%	2.16%	3.70%	0.82%	2.31%	1.62%	2.89%	2.45%	3.45%	1.68%	1.51%	1.88%
SPY State Street SPDR S&P 500 ETF	1.01%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%

Frequently Asked Questions

Can I hold both SIMO and SPY in my portfolio?

SIMO and SPY have a correlation of 0.49, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SIMO or SPY?

SIMO has higher volatility (24.54%) compared to SPY (4.64%). In terms of maximum drawdown, SIMO dropped -93.19% vs SPY's -55.19%.

Which has better risk-adjusted returns?

SIMO currently has the higher Sharpe Ratio (5.56 vs 2.16), 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.