RBUF vs. OCTB

Last updated Jun 4, 2026

RBUF (Innovator U.S. Small Cap 10 Buffer ETF - Quarterly) and OCTB (Aptus October Buffer ETF) are both Defined Outcome funds. Both are actively managed. A 0.78 correlation means they provide meaningful diversification when combined. RBUF charges 0.79%/yr vs 0.25%/yr for OCTB.

Performance

RBUF vs. OCTB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Innovator U.S. Small Cap 10 Buffer ETF - Quarterly (RBUF) and Aptus October Buffer ETF (OCTB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with RBUF having a 6.49% return and OCTB slightly lower at 6.18%.

RBUF

• 1D: -0.03%
• 1M: 1.38%
• YTD: 6.49%
• 6M: 5.47%
• 1Y: 15.41%
• 3Y*: —
• 5Y*: —
• 10Y*: —

OCTB

• 1D: -0.17%
• 1M: 2.41%
• YTD: 6.18%
• 6M: 6.75%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

RBUF vs. OCTB - Yearly Performance Comparison

	2026 (YTD)	2025
RBUF Innovator U.S. Small Cap 10 Buffer ETF - Quarterly	6.49%	0.48%
OCTB Aptus October Buffer ETF	6.18%	2.37%

Correlation

The correlation between RBUF and OCTB is 0.78, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 15, 2025	0.78

Return for Risk

RBUF vs. OCTB — Risk / Return Rank

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

RBUF

RBUF Risk / Return Rank: 84
RBUF Sharpe Ratio Rank: 77
RBUF Sortino Ratio Rank: 82
RBUF Omega Ratio Rank: 83
RBUF Calmar Ratio Rank: 88
RBUF Martin Ratio Rank: 91

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.

RBUF vs. OCTB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Innovator U.S. Small Cap 10 Buffer ETF - Quarterly (RBUF) and Aptus October Buffer ETF (OCTB). 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.

	RBUF	OCTB	Difference
Sharpe ratio: Return per unit of total volatility	2.48	—	—
Sortino ratio: Return per unit of downside risk	3.62	—	—
Omega ratio: Gain probability vs. loss probability	1.49	—	—
Calmar ratio: Return relative to maximum drawdown	5.00	—	—
Martin ratio: Return relative to average drawdown	21.18	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	RBUF	OCTB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.48	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.33	1.97	-0.64

Drawdowns

RBUF vs. OCTB - Drawdown Comparison

The maximum RBUF drawdown since its inception was -11.36%, which is greater than OCTB's maximum drawdown of -4.79%. Use the drawdown chart below to compare losses from any high point for RBUF and OCTB.

Drawdown Indicators

	RBUF	OCTB	Difference
Max Drawdown Largest peak-to-trough decline	-11.36%	-4.79%	-6.57%
Max Drawdown (1Y) Largest decline over 1 year	-3.09%	—	—
Current Drawdown Current decline from peak	-0.03%	-0.17%	+0.14%
Average Drawdown Average peak-to-trough decline	-1.34%	-0.70%	-0.64%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.73%	—	—

Volatility

Volatility by Period

	RBUF	OCTB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.74%	—	—
Volatility (6M) Calculated over the trailing 6-month period	4.11%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	6.27%	7.20%	-0.93%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	8.73%	7.20%	+1.53%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	8.73%	7.20%	+1.53%

RBUF vs. OCTB - Expense Ratio Comparison

RBUF has a 0.79% expense ratio, which is higher than OCTB's 0.25% expense ratio.

Dividends

RBUF vs. OCTB - Dividend Comparison

Neither RBUF nor OCTB has paid dividends to shareholders.

Tickers have no history of dividend payments

Frequently Asked Questions

Can I hold both RBUF and OCTB in my portfolio?

RBUF and OCTB have a correlation of 0.78, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, RBUF or OCTB?

On fees, OCTB is cheaper at 0.25% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, RBUF or OCTB?

OCTB is cheaper with a 0.25% expense ratio, compared with 0.79% for RBUF.

Which ETF pays a higher dividend yield, RBUF or OCTB?

RBUF and OCTB have nearly identical dividend yields, around 0.00%.

What is the main difference between RBUF and OCTB?

They also come from different issuers: Innovator and Aptus Capital Advisors. Their fees differ too: 0.79% for RBUF and 0.25% for OCTB.