AOSL vs. VTSAX

Last updated Jun 3, 2026

AOSL (Alpha and Omega Semiconductor Limited) is a stock, while VTSAX (Vanguard Total Stock Market Index Fund Admiral Shares) is Large Cap Blend Equities fund managed by Vanguard. Over the past 10 years, AOSL returned 14.49%/yr vs 15.09%/yr for VTSAX. A 0.51 correlation means they provide meaningful diversification when combined.

Performance

AOSL vs. VTSAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Alpha and Omega Semiconductor Limited (AOSL) and Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AOSL achieves a 169.16% return, which is significantly higher than VTSAX's 11.71% return. Both investments have delivered pretty close results over the past 10 years, with AOSL having a 14.49% annualized return and VTSAX not far ahead at 15.09%.

AOSL

• 1D: 21.51%
• 1M: 23.77%
• YTD: 169.16%
• 6M: 158.21%
• 1Y: 149.74%
• 3Y*: 22.99%
• 5Y*: 11.89%
• 10Y*: 14.49%

VTSAX

• 1D: 0.25%
• 1M: 5.10%
• YTD: 11.71%
• 6M: 12.07%
• 1Y: 29.65%
• 3Y*: 22.24%
• 5Y*: 12.88%
• 10Y*: 15.09%

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

AOSL vs. VTSAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AOSL Alpha and Omega Semiconductor Limited	169.16%	-46.50%	42.10%	-8.79%	-52.82%	156.18%	73.57%	33.66%	-37.71%	-23.08%
VTSAX Vanguard Total Stock Market Index Fund Admiral Shares	11.71%	17.12%	23.23%	26.51%	-19.52%	25.72%	20.98%	30.79%	-5.18%	21.16%

Correlation

The correlation between AOSL and VTSAX is 0.58, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.58
Correlation (3Y) Calculated over the trailing 3-year period	0.55
Correlation (5Y) Calculated over the trailing 5-year period	0.62
Correlation (10Y) Calculated over the trailing 10-year period	0.55
Correlation (All Time) Calculated using the full available price history since Apr 30, 2010	0.51

The correlation between AOSL and VTSAX shifts across timeframes, from 0.51 (all time) to 0.62 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

AOSL vs. VTSAX — Risk / Return Rank

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

AOSL

AOSL Risk / Return Rank: 83
AOSL Sharpe Ratio Rank: 87
AOSL Sortino Ratio Rank: 81
AOSL Omega Ratio Rank: 85
AOSL Calmar Ratio Rank: 84
AOSL Martin Ratio Rank: 80

VTSAX

VTSAX Risk / Return Rank: 72
VTSAX Sharpe Ratio Rank: 73
VTSAX Sortino Ratio Rank: 65
VTSAX Omega Ratio Rank: 64
VTSAX Calmar Ratio Rank: 74
VTSAX Martin Ratio Rank: 83

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.

AOSL vs. VTSAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Alpha and Omega Semiconductor Limited (AOSL) and Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX). 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.

	AOSL	VTSAX	Difference
Sharpe ratio Return per unit of total volatility	1.99	2.49	-0.49
Sortino ratio Return per unit of downside risk	2.43	3.38	-0.96
Omega ratio Gain probability vs. loss probability	1.36	1.45	-0.08
Calmar ratio Return relative to maximum drawdown	3.34	3.38	-0.04
Martin ratio Return relative to average drawdown	6.63	15.63	-9.00
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AOSL vs. VTSAX - Sharpe Ratio Comparison

The current AOSL Sharpe Ratio is 1.99, which is comparable to the VTSAX Sharpe Ratio of 2.49. The chart below compares the historical Sharpe Ratios of AOSL and VTSAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	AOSL	VTSAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.99	2.49	-0.49
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.17	0.75	-0.57
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.23	0.82	-0.59
Sharpe Ratio (All Time) Calculated using the full available price history	0.13	0.47	-0.34

Drawdowns

AOSL vs. VTSAX - Drawdown Comparison

The maximum AOSL drawdown since its inception was -75.27%, which is greater than VTSAX's maximum drawdown of -55.33%. Use the drawdown chart below to compare losses from any high point for AOSL and VTSAX.

Drawdown Indicators

	AOSL	VTSAX	Difference
Max Drawdown Largest peak-to-trough decline	-75.27%	-55.33%	-19.94%
Max Drawdown (1Y) Largest decline over 1 year	-45.32%	-8.92%	-36.40%
Max Drawdown (3Y) Largest decline over 3 years	-66.94%	-19.36%	-47.58%
Max Drawdown (5Y) Largest decline over 5 years	-75.27%	-25.36%	-49.91%
Max Drawdown (10Y) Largest decline over 10 years	-75.27%	-34.97%	-40.30%
Current Drawdown Current decline from peak	-18.87%	0.00%	-18.87%
Average Drawdown Average peak-to-trough decline	-43.25%	-9.01%	-34.24%
Ulcer Index Depth and duration of drawdowns from previous peaks	22.82%	1.93%	+20.89%

Volatility

AOSL vs. VTSAX - Volatility Comparison

Alpha and Omega Semiconductor Limited (AOSL) has a higher volatility of 43.20% compared to Vanguard Total Stock Market Index Fund Admiral Shares (VTSAX) at 2.95%. This indicates that AOSL's price experiences larger fluctuations and is considered to be riskier than VTSAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AOSL	VTSAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	43.20%	2.95%	+40.25%
Volatility (6M) Calculated over the trailing 6-month period	57.25%	9.20%	+48.05%
Volatility (1Y) Calculated over the trailing 1-year period	75.61%	12.21%	+63.40%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	69.71%	17.36%	+52.35%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	63.41%	18.41%	+45.00%

Dividends

AOSL vs. VTSAX - Dividend Comparison

AOSL has not paid dividends to shareholders, while VTSAX's dividend yield for the trailing twelve months is around 1.00%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AOSL Alpha and Omega Semiconductor Limited	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
VTSAX Vanguard Total Stock Market Index Fund Admiral Shares	1.00%	1.11%	1.26%	1.42%	1.65%	1.20%	1.41%	1.76%	2.03%	1.71%	1.92%	1.98%

Frequently Asked Questions

Can I hold both AOSL and VTSAX in my portfolio?

AOSL and VTSAX have a correlation of 0.58, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, AOSL or VTSAX?

AOSL has higher volatility (43.20%) compared to VTSAX (2.95%). In terms of maximum drawdown, AOSL dropped -75.27% vs VTSAX's -55.33%.

Which has better risk-adjusted returns?

VTSAX currently has the higher Sharpe Ratio (2.48 vs 1.99), 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.