IRDM vs. OPPJ

Last updated Jul 17, 2026

IRDM (Iridium Communications Inc.) is a stock, while OPPJ (WisdomTree Japan Opportunities ETF) is Japan Equities fund tracking the WisdomTree Japan Opportunities Index. Over the past 10 years, IRDM returned 18.72%/yr vs 17.08%/yr for OPPJ. At a 0.30 correlation, their price movements are largely independent.

Performance

IRDM vs. OPPJ - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Iridium Communications Inc. (IRDM) and WisdomTree Japan Opportunities ETF (OPPJ). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IRDM achieves a 170.67% return, which is significantly higher than OPPJ's 22.94% return. Over the past 10 years, IRDM has outperformed OPPJ with an annualized return of 18.72%, while OPPJ has yielded a comparatively lower 17.08% annualized return.

IRDM

• 1D: -4.23%
• 1M: 7.27%
• 6M: 144.12%
• YTD: 170.67%
• 1Y: 53.33%
• 3Y*: -6.24%
• 5Y*: 6.13%
• 10Y*: 18.72%

OPPJ

• 1D: -2.04%
• 1M: -3.76%
• 6M: 11.89%
• YTD: 22.94%
• 1Y: 60.73%
• 3Y*: 32.84%
• 5Y*: 24.53%
• 10Y*: 17.08%

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

IRDM vs. OPPJ - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IRDM Iridium Communications Inc.	170.67%	-38.51%	-28.09%	-19.10%	24.49%	5.00%	59.60%	33.55%	56.36%	22.92%
OPPJ WisdomTree Japan Opportunities ETF	22.94%	37.08%	20.70%	38.96%	5.02%	11.66%	-3.22%	18.24%	-18.69%	29.56%

Correlation

The correlation between IRDM and OPPJ is 0.25, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.25
Correlation (3Y) Calculated over the trailing 3-year period	0.23
Correlation (5Y) Calculated over the trailing 5-year period	0.28
Correlation (10Y) Calculated over the trailing 10-year period	0.30
Correlation (All Time) Calculated using the full available price history since Jun 28, 2013	0.30

Return for Risk

IRDM vs. OPPJ — Risk / Return Rank

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

IRDM

IRDM Risk / Return Rank: 68
IRDM Sharpe Ratio Rank: 70
IRDM Sortino Ratio Rank: 70
IRDM Omega Ratio Rank: 72
IRDM Calmar Ratio Rank: 67
IRDM Martin Ratio Rank: 62

OPPJ

OPPJ Risk / Return Rank: 94
OPPJ Sharpe Ratio Rank: 95
OPPJ Sortino Ratio Rank: 93
OPPJ Omega Ratio Rank: 91
OPPJ Calmar Ratio Rank: 95
OPPJ Martin Ratio Rank: 93

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.

IRDM vs. OPPJ - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Iridium Communications Inc. (IRDM) and WisdomTree Japan Opportunities ETF (OPPJ). 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.

	IRDM	OPPJ	Difference
Sharpe ratio: Return per unit of total volatility	0.78	2.92	-2.14
Sortino ratio: Return per unit of downside risk	1.52	3.77	-2.25
Omega ratio: Gain probability vs. loss probability	1.21	1.48	-0.27
Calmar ratio: Return relative to maximum drawdown	1.06	6.21	-5.16
Martin ratio: Return relative to average drawdown	1.72	19.42	-17.70

IRDM vs. OPPJ - Sharpe Ratio Comparison

The current IRDM Sharpe Ratio is 0.78, which is lower than the OPPJ Sharpe Ratio of 2.92. The chart below compares the historical Sharpe Ratios of IRDM and OPPJ, 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

IRDM vs. OPPJ - Drawdown Comparison

The maximum IRDM drawdown since its inception was -75.34%, which is greater than OPPJ's maximum drawdown of -39.30%. Use the drawdown chart below to compare losses from any high point for IRDM and OPPJ.

Drawdown Indicators

	IRDM	OPPJ	Difference
Max Drawdown Largest peak-to-trough decline	-75.34%	-39.30%	-36.04%
Max Drawdown (1Y) Largest decline over 1 year	-50.74%	-9.82%	-40.92%
Max Drawdown (3Y) Largest decline over 3 years	-72.85%	-16.49%	-56.36%
Max Drawdown (5Y) Largest decline over 5 years	-75.34%	-16.49%	-58.85%
Max Drawdown (10Y) Largest decline over 10 years	-75.34%	-39.30%	-36.04%
Current Drawdown Current decline from peak	-26.17%	-6.71%	-19.46%
Average Drawdown Average peak-to-trough decline	-25.98%	-6.48%	-19.50%
Ulcer Index Depth and duration of drawdowns from previous peaks	31.11%	3.14%	+27.97%

Volatility

IRDM vs. OPPJ - Volatility Comparison

Iridium Communications Inc. (IRDM) has a higher volatility of 26.20% compared to WisdomTree Japan Opportunities ETF (OPPJ) at 7.53%. This indicates that IRDM's price experiences larger fluctuations and is considered to be riskier than OPPJ based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IRDM	OPPJ	Difference
Volatility (1M) Calculated over the trailing 1-month period	26.20%	7.53%	+18.67%
Volatility (6M) Calculated over the trailing 6-month period	52.84%	17.13%	+35.71%
Volatility (1Y) Calculated over the trailing 1-year period	69.10%	20.93%	+48.17%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	47.19%	18.33%	+28.86%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	46.24%	19.56%	+26.68%

Dividends

IRDM vs. OPPJ - Dividend Comparison

IRDM's dividend yield for the trailing twelve months is around 1.29%, more than OPPJ's 1.14% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IRDM Iridium Communications Inc.	1.29%	3.34%	1.90%	1.26%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
OPPJ WisdomTree Japan Opportunities ETF	1.14%	1.78%	4.02%	2.71%	2.63%	2.96%	3.04%	2.17%	2.06%	1.53%	1.66%	3.61%

Frequently Asked Questions

Can I hold both IRDM and OPPJ in my portfolio?

IRDM and OPPJ have a correlation of 0.25, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IRDM or OPPJ?

IRDM has higher volatility (26.20%) compared to OPPJ (7.53%). In terms of maximum drawdown, IRDM dropped -75.34% vs OPPJ's -39.30%.

Which has better risk-adjusted returns?

OPPJ currently has the higher Sharpe Ratio (2.92 vs 0.78), 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.