RBLU vs. KORU

Last updated Jun 24, 2026

RBLU (T-Rex 2X Long RBLX Daily Target ETF) and KORU (Direxion Daily South Korea Bull 3X Shares) are both Leveraged Equities funds - RBLU tracks the Roblox Corp. Class A (RBLX) while KORU tracks the MSCI Korea 25-50 Index. Both are passively managed. Over the past year, RBLU returned -88.85% vs 858.44% for KORU. At a 0.20 correlation, their price movements are largely independent. RBLU charges 1.05%/yr vs 1.29%/yr for KORU.

Performance

RBLU vs. KORU - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T-Rex 2X Long RBLX Daily Target ETF (RBLU) and Direxion Daily South Korea Bull 3X Shares (KORU). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RBLU achieves a -76.56% return, which is significantly lower than KORU's 285.56% return.

RBLU

• 1D: -0.87%
• 1M: -8.69%
• YTD: -76.56%
• 6M: -76.79%
• 1Y: -88.85%
• 3Y*: —
• 5Y*: —
• 10Y*: —

KORU

• 1D: -35.70%
• 1M: -10.30%
• YTD: 285.56%
• 6M: 341.44%
• 1Y: 858.44%
• 3Y*: 100.70%
• 5Y*: 11.21%
• 10Y*: 14.49%

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

RBLU vs. KORU - Yearly Performance Comparison

	2026 (YTD)	2025
RBLU T-Rex 2X Long RBLX Daily Target ETF	-76.56%	23.90%
KORU Direxion Daily South Korea Bull 3X Shares	285.56%	359.59%

Correlation

The correlation between RBLU and KORU is 0.13, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.13
Correlation (All Time) Calculated using the full available price history since Mar 4, 2025	0.20

Return for Risk

RBLU vs. KORU — Risk / Return Rank

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

RBLU

RBLU Risk / Return Rank: 2
RBLU Sharpe Ratio Rank: 3
RBLU Sortino Ratio Rank: 1
RBLU Omega Ratio Rank: 1
RBLU Calmar Ratio Rank: 1
RBLU Martin Ratio Rank: 2

KORU

KORU Risk / Return Rank: 93
KORU Sharpe Ratio Rank: 99
KORU Sortino Ratio Rank: 84
KORU Omega Ratio Rank: 88
KORU Calmar Ratio Rank: 98
KORU Martin Ratio Rank: 97

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.

RBLU vs. KORU - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T-Rex 2X Long RBLX Daily Target ETF (RBLU) and Direxion Daily South Korea Bull 3X Shares (KORU). 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.

	RBLU	KORU	Difference
Sharpe ratio: Return per unit of total volatility	-0.72	6.02	-6.74
Sortino ratio: Return per unit of downside risk	-1.48	3.56	-5.04
Omega ratio: Gain probability vs. loss probability	0.82	1.53	-0.71
Calmar ratio: Return relative to maximum drawdown	-0.94	14.12	-15.06
Martin ratio: Return relative to average drawdown	-1.36	41.38	-42.74

RBLU vs. KORU - Sharpe Ratio Comparison

The current RBLU Sharpe Ratio is -0.72, which is lower than the KORU Sharpe Ratio of 6.02. The chart below compares the historical Sharpe Ratios of RBLU and KORU, 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

RBLU vs. KORU - Drawdown Comparison

The maximum RBLU drawdown since its inception was -94.76%, roughly equal to the maximum KORU drawdown of -95.79%. Use the drawdown chart below to compare losses from any high point for RBLU and KORU.

Drawdown Indicators

	RBLU	KORU	Difference
Max Drawdown Largest peak-to-trough decline	-94.76%	-95.79%	+1.03%
Max Drawdown (1Y) Largest decline over 1 year	-94.76%	-61.39%	-33.37%
Max Drawdown (3Y) Largest decline over 3 years	—	-73.34%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-93.34%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-95.79%	—
Current Drawdown Current decline from peak	-93.45%	-44.66%	-48.79%
Average Drawdown Average peak-to-trough decline	-44.77%	-57.41%	+12.64%
Ulcer Index Depth and duration of drawdowns from previous peaks	65.26%	20.91%	+44.35%

Volatility

RBLU vs. KORU - Volatility Comparison

The current volatility for T-Rex 2X Long RBLX Daily Target ETF (RBLU) is 37.54%, while Direxion Daily South Korea Bull 3X Shares (KORU) has a volatility of 92.27%. This indicates that RBLU experiences smaller price fluctuations and is considered to be less risky than KORU based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RBLU	KORU	Difference
Volatility (1M) Calculated over the trailing 1-month period	37.54%	92.27%	-54.73%
Volatility (6M) Calculated over the trailing 6-month period	102.64%	138.63%	-35.99%
Volatility (1Y) Calculated over the trailing 1-year period	122.97%	144.16%	-21.19%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	118.40%	91.40%	+27.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	118.40%	83.03%	+35.37%

RBLU vs. KORU - Expense Ratio Comparison

RBLU has a 1.05% expense ratio, which is lower than KORU's 1.29% expense ratio.

Dividends

RBLU vs. KORU - Dividend Comparison

RBLU's dividend yield for the trailing twelve months is around 5.52%, more than KORU's 0.24% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
KORU Direxion Daily South Korea Bull 3X Shares	0.24%	0.89%	4.10%	2.55%	0.48%	0.76%	0.01%	0.93%	1.40%	3.59%
RBLU T-Rex 2X Long RBLX Daily Target ETF	5.52%	1.29%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both RBLU and KORU in my portfolio?

RBLU and KORU have a correlation of 0.13, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RBLU or KORU?

KORU has higher volatility (92.27%) compared to RBLU (37.54%). In terms of maximum drawdown, RBLU dropped -94.76% vs KORU's -95.79%.

Which ETF is better, RBLU or KORU?

On 1-year performance, KORU leads with 858.44% vs -88.85% for RBLU. On fees, RBLU is cheaper at 1.05% per year. On volatility, RBLU has been the lower-risk option at 37.54%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, RBLU or KORU?

Over the 1-year period, KORU has performed better with a 858.44% return vs -88.85%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, RBLU or KORU?

RBLU is cheaper with a 1.05% expense ratio, compared with 1.29% for KORU.

Which ETF pays a higher dividend yield, RBLU or KORU?

RBLU has the higher dividend yield at 5.52%, compared with 0.24% for KORU.

What is the main difference between RBLU and KORU?

RBLU tracks Roblox Corp. Class A (RBLX), while KORU tracks MSCI Korea 25-50 Index. They also come from different issuers: T-Rex and Direxion. Their fees differ too: 1.05% for RBLU and 1.29% for KORU.

Which has better risk-adjusted returns?

KORU currently has the higher Sharpe Ratio (6.02 vs -0.72), 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.