KMAY vs. APRB

Last updated Jun 4, 2026

KMAY (Innovator U.S. Small Cap Power Buffer ETF - May) and APRB (Aptus April Buffer ETF) are both Defined Outcome funds. Both are actively managed. A 0.73 correlation means they provide meaningful diversification when combined. KMAY charges 0.79%/yr vs 0.25%/yr for APRB.

Performance

KMAY vs. APRB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Innovator U.S. Small Cap Power Buffer ETF - May (KMAY) and Aptus April Buffer ETF (APRB). 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 KMAY having a 4.86% return and APRB slightly lower at 4.77%.

KMAY

• 1D: -0.66%
• 1M: 1.80%
• YTD: 4.86%
• 6M: 5.68%
• 1Y: 15.29%
• 3Y*: —
• 5Y*: —
• 10Y*: —

APRB

• 1D: -0.11%
• 1M: 1.69%
• YTD: 4.77%
• 6M: 5.32%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

KMAY vs. APRB - Yearly Performance Comparison

	2026 (YTD)	2025
KMAY Innovator U.S. Small Cap Power Buffer ETF - May	4.86%	1.98%
APRB Aptus April Buffer ETF	4.77%	2.48%

Correlation

The correlation between KMAY and APRB is 0.73, 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	0.73

Return for Risk

KMAY vs. APRB — Risk / Return Rank

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

KMAY

KMAY Risk / Return Rank: 87
KMAY Sharpe Ratio Rank: 78
KMAY Sortino Ratio Rank: 86
KMAY Omega Ratio Rank: 85
KMAY Calmar Ratio Rank: 93
KMAY Martin Ratio Rank: 94

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.

KMAY vs. APRB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Innovator U.S. Small Cap Power Buffer ETF - May (KMAY) and Aptus April Buffer ETF (APRB). 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.

	KMAY	APRB	Difference
Sharpe ratio: Return per unit of total volatility	2.51	—	—
Sortino ratio: Return per unit of downside risk	3.83	—	—
Omega ratio: Gain probability vs. loss probability	1.51	—	—
Calmar ratio: Return relative to maximum drawdown	6.46	—	—
Martin ratio: Return relative to average drawdown	27.25	—	—
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

	KMAY	APRB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.51	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.68	2.00	+0.67

Drawdowns

KMAY vs. APRB - Drawdown Comparison

The maximum KMAY drawdown since its inception was -2.38%, smaller than the maximum APRB drawdown of -4.59%. Use the drawdown chart below to compare losses from any high point for KMAY and APRB.

Drawdown Indicators

	KMAY	APRB	Difference
Max Drawdown Largest peak-to-trough decline	-2.38%	-4.59%	+2.21%
Max Drawdown (1Y) Largest decline over 1 year	-2.38%	—	—
Current Drawdown Current decline from peak	-0.69%	-0.11%	-0.58%
Average Drawdown Average peak-to-trough decline	-0.35%	-0.74%	+0.39%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.56%	—	—

Volatility

Volatility by Period

	KMAY	APRB	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.89%	—	—
Volatility (6M) Calculated over the trailing 6-month period	3.99%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	6.16%	5.98%	+0.18%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.65%	5.98%	+0.67%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.65%	5.98%	+0.67%

KMAY vs. APRB - Expense Ratio Comparison

KMAY has a 0.79% expense ratio, which is higher than APRB's 0.25% expense ratio.

Dividends

KMAY vs. APRB - Dividend Comparison

Neither KMAY nor APRB has paid dividends to shareholders.

Tickers have no history of dividend payments

Frequently Asked Questions

Can I hold both KMAY and APRB in my portfolio?

KMAY and APRB have a correlation of 0.73, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, KMAY or APRB?

On fees, APRB 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, KMAY or APRB?

APRB is cheaper with a 0.25% expense ratio, compared with 0.79% for KMAY.

Which ETF pays a higher dividend yield, KMAY or APRB?

KMAY and APRB have nearly identical dividend yields, around 0.00%.

What is the main difference between KMAY and APRB?

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