IAUM vs. VOO

Last updated Jun 6, 2026

IAUM (iShares Gold Trust Micro) and VOO (Vanguard S&P 500 ETF) are both exchange-traded funds - IAUM is a Gold fund tracking the LBMA Gold Price PM, while VOO is a S&P 500 fund tracking the S&P 500 Index. Both are passively managed. Over the past 3 years, IAUM returned 29.97%/yr vs 21.52%/yr for VOO. At a 0.12 correlation, their price movements are largely independent. IAUM charges 0.09%/yr vs 0.03%/yr for VOO.

Performance

IAUM vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Gold Trust Micro (IAUM) and Vanguard S&P 500 ETF (VOO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IAUM achieves a 0.07% return, which is significantly lower than VOO's 8.45% return.

IAUM

• 1D: -3.63%
• 1M: -8.02%
• YTD: 0.07%
• 6M: 2.72%
• 1Y: 28.61%
• 3Y*: 29.97%
• 5Y*: —
• 10Y*: —

VOO

• 1D: -2.59%
• 1M: 0.50%
• YTD: 8.45%
• 6M: 8.18%
• 1Y: 25.87%
• 3Y*: 21.52%
• 5Y*: 13.39%
• 10Y*: 15.23%

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

IAUM vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
IAUM iShares Gold Trust Micro	0.07%	64.27%	27.04%	13.12%	-0.49%	3.87%
VOO Vanguard S&P 500 ETF	8.45%	17.82%	24.98%	26.32%	-18.17%	11.81%

Correlation

The correlation between IAUM and VOO is 0.21, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.21
Correlation (3Y) Calculated over the trailing 3-year period	0.16
Correlation (All Time) Calculated using the full available price history since Jun 30, 2021	0.12

IAUM vs. VOO - Sectors Allocation Comparison

Sectors	IAUM	VOO
Real Estate	100.0%	1.9%
Basic Materials	-	1.8%
Communication Services	-	11.3%
Consumer Cyclical	-	10.2%
Consumer Defensive	-	4.9%
Energy	-	3.5%
Financial Services	-	11.6%
Healthcare	-	8.5%
Industrials	-	8.3%
Technology	-	35.7%
Utilities	-	2.4%

Return for Risk

IAUM vs. VOO — Risk / Return Rank

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

IAUM

IAUM Risk / Return Rank: 30
IAUM Sharpe Ratio Rank: 31
IAUM Sortino Ratio Rank: 28
IAUM Omega Ratio Rank: 33
IAUM Calmar Ratio Rank: 30
IAUM Martin Ratio Rank: 27

VOO

VOO Risk / Return Rank: 66
VOO Sharpe Ratio Rank: 67
VOO Sortino Ratio Rank: 63
VOO Omega Ratio Rank: 66
VOO Calmar Ratio Rank: 60
VOO Martin Ratio Rank: 73

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.

IAUM vs. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Gold Trust Micro (IAUM) and Vanguard S&P 500 ETF (VOO). 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.

	IAUM	VOO	Difference
Sharpe ratio: Return per unit of total volatility	1.08	2.15	-1.07
Sortino ratio: Return per unit of downside risk	1.46	2.89	-1.43
Omega ratio: Gain probability vs. loss probability	1.22	1.39	-0.17
Calmar ratio: Return relative to maximum drawdown	1.44	2.92	-1.48
Martin ratio: Return relative to average drawdown	3.64	13.53	-9.89
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IAUM vs. VOO - Sharpe Ratio Comparison

The current IAUM Sharpe Ratio is 1.08, which is lower than the VOO Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of IAUM and VOO, 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

	IAUM	VOO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.08	2.15	-1.07
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.80	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.85	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.11	0.88	+0.23

Drawdowns

IAUM vs. VOO - Drawdown Comparison

The maximum IAUM drawdown since its inception was -20.87%, smaller than the maximum VOO drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for IAUM and VOO.

Drawdown Indicators

	IAUM	VOO	Difference
Max Drawdown Largest peak-to-trough decline	-20.87%	-33.99%	+13.12%
Max Drawdown (1Y) Largest decline over 1 year	-20.02%	-8.90%	-11.12%
Max Drawdown (3Y) Largest decline over 3 years	-20.02%	-18.69%	-1.33%
Max Drawdown (5Y) Largest decline over 5 years	—	-24.52%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-33.99%	—
Current Drawdown Current decline from peak	-20.02%	-2.90%	-17.12%
Average Drawdown Average peak-to-trough decline	-5.32%	-3.69%	-1.63%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.88%	1.92%	+5.96%

Volatility

IAUM vs. VOO - Volatility Comparison

iShares Gold Trust Micro (IAUM) has a higher volatility of 5.63% compared to Vanguard S&P 500 ETF (VOO) at 3.74%. This indicates that IAUM's price experiences larger fluctuations and is considered to be riskier than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IAUM	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.63%	3.74%	+1.89%
Volatility (6M) Calculated over the trailing 6-month period	23.20%	9.30%	+13.90%
Volatility (1Y) Calculated over the trailing 1-year period	26.56%	12.10%	+14.46%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.93%	16.84%	+1.09%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.93%	18.02%	-0.09%

IAUM vs. VOO - Expense Ratio Comparison

IAUM has a 0.09% expense ratio, which is higher than VOO's 0.03% 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%.

Dividends

IAUM vs. VOO - Dividend Comparison

IAUM has not paid dividends to shareholders, while VOO's dividend yield for the trailing twelve months is around 1.05%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IAUM iShares Gold Trust Micro	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
VOO Vanguard S&P 500 ETF	1.05%	1.13%	1.24%	1.46%	1.69%	1.25%	1.54%	1.88%	2.06%	1.78%	2.02%	2.10%

Frequently Asked Questions

Can I hold both IAUM and VOO in my portfolio?

IAUM and VOO have a correlation of 0.21, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IAUM or VOO?

IAUM has higher volatility (5.63%) compared to VOO (3.74%). In terms of maximum drawdown, IAUM dropped -20.87% vs VOO's -33.99%.

Which ETF is better, IAUM or VOO?

On 3-year performance, IAUM leads with 29.97% vs 21.52% for VOO. On fees, VOO is cheaper at 0.03% per year. On volatility, VOO has been the lower-risk option at 3.74%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, IAUM or VOO?

Over the 3-year period, IAUM has performed better with a 29.97% return vs 21.52%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IAUM or VOO?

VOO is cheaper with a 0.03% expense ratio, compared with 0.09% for IAUM.

Which ETF pays a higher dividend yield, IAUM or VOO?

VOO has the higher dividend yield at 1.05%, compared with 0.00% for IAUM.

What is the main difference between IAUM and VOO?

IAUM is categorized as Gold, while VOO is S&P 500. IAUM tracks LBMA Gold Price PM, while VOO tracks S&P 500 Index. They also come from different issuers: iShares and Vanguard. Their fees differ too: 0.09% for IAUM and 0.03% for VOO.

Which has better risk-adjusted returns?

VOO currently has the higher Sharpe Ratio (2.15 vs 1.08), 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.