The fund holds large-cap US stocks while selling call options on those equity positions, then uses part of the premium to buy broad-index put options, a collar derivative structure. It is a hybrid strategy that targets growth and downside protection together.

It suits investors who want to participate in US equity growth but cushion some of the downside risk, as well as medium- to long-term investors focused on managing portfolio volatility.

Aptus Capital Advisors launched the ETF in 2019, and it is run on an active management basis.

The fund sells call options on individual large-cap US stocks (covered calls) to collect premium income, then uses part of that premium to buy put options on a broad market index, limiting the size of downside losses. This is a collar derivative structure: it gives up some of the upside in exchange for a cushion against losses in falling markets.

• Combining single-stock covered calls with index put purchases strengthens downside protection compared with a simple covered call ETF
• A monthly dividend payout structure provides regular cash flow

Assets under management (AUM) stand at $2.3B, and the expense ratio is 0.79% per year.

The fee level is somewhat higher than that of comparable ETFs, but it can be viewed as an active-strategy premium that reflects the cost of running the derivative contracts.

In phases of strong US large-cap gains, the upside cap from the short calls can weigh on relative performance. In more volatile periods, however, the put purchase structure acts as a loss cushion, and declines tend to be smaller than the market average.

When concerns about rising volatility intensify, money tends to flow into defensive option strategy ETFs, and the monthly dividend payout structure is another factor that attracts capital seeking stable cash flow.

Its strengths are two cushioning features, downside protection and monthly dividends, while the upside cap and relatively high fee are factors to consider.

The MOAT, PTLC and PKW shown in the table are ETFs in the same US equity quant strategy category, focused only on stock selection without derivative contracts. BALT and PTNQ are buffer strategies targeting a balanced portfolio and the Nasdaq, respectively, and pursue downside protection in different ways. ETFs with similar option strategy structures can also be compared, including the buffer-type BUFR, the outcome strategy TJUL and the hedged strategy HEGD. These ETFs differ from ACIO in the level of upside cap and the range of downside protection.

Here are the points to review before investing in ACIO. It is important to fully understand in advance the return pattern, the upside cap and the cost structure that are unique to derivative-based ETFs.

The upside cap and the fee level can have a cumulative effect on long-term compounded returns. In addition, a derivative structure can deliver results that differ from expectations depending on the market phase, so understanding the strategy structure should come first.

It is a structure worth considering for investors who want to stay exposed to growth while partly cushioning downside risk. It suits those who want lower volatility than a pure equity ETF and can accept a partial cushion rather than full protection.