Buffer ETFs on the S&P 500 vs. the Nasdaq-100: What Changes?

By Adam Patti, Chief Executive Officer, VistaShares | Published November 13, 2026

Buffer ETFs on the S&P 500 and the Nasdaq-100 use the same option structure, but the index changes the outcomes. The Nasdaq-100 is more concentrated in technology and growth companies and its implied volatility is usually higher, so its options cost more. For the same buffer, that usually means a higher cap on a Nasdaq-100 buffer ETF, along with a greater chance that losses exceed the buffer in a severe decline.

How do the two indexes differ?

The S&P 500 is a broad index of 500 leading large U.S. companies across every sector of the economy, including financials, health care, industrials, energy and consumer companies as well as technology. It is the most widely used benchmark for U.S. large-cap stocks.

The Nasdaq-100 includes 100 of the largest domestic and international non-financial companies listed on the Nasdaq Stock Market, based on market capitalization. It does not include financial companies.¹ Its composition leans heavily toward technology, communication services and consumer companies, many of them growth-oriented.

Both indexes are weighted by market capitalization, with adjustments, so their largest companies have a large influence. Many of the largest companies appear in both, but the Nasdaq-100’s fewer holdings and narrower sector mix make it more concentrated.

Why does volatility matter for a buffer ETF?

A buffer ETF is built from options on its reference index. The fund buys a put spread to create the buffer and sells a call to help pay for it, which sets the cap. Option prices rise with implied volatility, the market’s expectation of how much the index might move. Our article on what drives a buffer ETF cap explains the inputs.

Higher volatility affects both sides. The put spread costs more, but the call the fund sells also brings in more premium. For buffers measured from the starting level, the call premium usually rises enough that the fund can set the cap further above the starting level. That is why, other things equal, a Nasdaq-100 buffer ETF tends to carry a higher cap than an S&P 500 buffer ETF with the same buffer and outcome period.

For example, on the same day, a one-year S&P 500 buffer ETF with a 10% buffer might set a 12% cap, while a one-year Nasdaq-100 buffer ETF with a 10% buffer might set a 16% cap. (Hypothetical, before fees and expenses.)

What does the higher cap trade against?

The higher cap reflects the higher expected range of movement in the Nasdaq-100. That range works in both directions. A more volatile index is more likely to rise past a cap, and it is also more likely to fall further than the buffer. A 10% buffer absorbs the same first 10% of losses on either index, but a more volatile index has a greater chance of a decline that runs past the buffer. Our article on how often stocks fall looks at the frequency of declines.

How do outcomes compare across scenarios?

Using the hypothetical terms above, a 10% buffer on each index, a 12% cap on the S&P 500 version and a 16% cap on the Nasdaq-100 version, for an investor who holds the full one-year outcome period. (Hypothetical, before fees and expenses.)

Both indexes rise 20%: S&P 500 buffer ETF 12%; Nasdaq-100 buffer ETF 16%.

S&P 500 rises 8%, Nasdaq-100 rises 14%: S&P 500 buffer ETF 8%; Nasdaq-100 buffer ETF 14%.

S&P 500 falls 8%, Nasdaq-100 falls 12%: S&P 500 buffer ETF 0%; Nasdaq-100 buffer ETF minus 2%.

S&P 500 falls 20%, Nasdaq-100 falls 30%: S&P 500 buffer ETF minus 10%; Nasdaq-100 buffer ETF minus 20%.

The Nasdaq-100 version offers more upside in strong markets for technology and growth stocks, and more downside in sharp sell-offs of those same stocks.

How does the index choice fit a portfolio?

Overlap with existing holdings: an investor whose portfolio already leans toward large technology companies may find a Nasdaq-100 buffer ETF adds to that concentration. An S&P 500 version spreads exposure across more sectors.

Role in the portfolio: some investors use an S&P 500 buffer ETF as a core equity holding with a defined range of outcomes, and a Nasdaq-100 version as a growth tilt with a buffer.

Risk tolerance: because the Nasdaq-100 is more concentrated, the chance of losses beyond the buffer is higher, even though the cap is higher too.

Sector exposure: the Nasdaq-100 excludes financial companies, so an investor who wants exposure to banks and insurers through a buffer ETF would look to the S&P 500.

Our article on S&P 500 versus Nasdaq-100 covered calls discusses the same index trade-off for income strategies.

Do monthly and annual outcome periods change the comparison?

The same principles apply to monthly buffer ETFs, which reset their buffer and cap each month. Because a month is short, caps and buffers are smaller in absolute terms, but the Nasdaq-100 version still typically carries a higher cap than the S&P 500 version for the same buffer. Monthly resets also mean the terms adjust quickly to changes in volatility in each index. Our article on annual versus monthly outcome periods compares the two.

What should investors check when comparing them?

Current cap and buffer: published by the fund sponsor, along with remaining values for mid-period buyers.

Outcome period dates: when the current period started and ends.

Expense ratio: costs reduce the effective buffer and cap.

Holdings overlap: how each index overlaps with the rest of the portfolio.

Index dividends: buffer ETFs on price-return index options generally do not receive dividends, so the forgone dividend cost depends on each index’s dividend yield, which index providers and data services publish.

More buffer articles and tools are in the Buffer ETF Guide.

Frequently asked questions

Why do Nasdaq-100 buffer ETFs usually have higher caps?

When the Nasdaq-100 has higher implied volatility than the S&P 500, the call options a buffer ETF sells bring in more premium. That extra premium lets the fund set a cap further above the starting level for the same buffer and outcome period.

Is a Nasdaq-100 buffer ETF riskier than an S&P 500 buffer ETF?

Generally, yes, in the sense that the Nasdaq-100 is more concentrated in fewer companies and sectors, so a decline larger than the buffer is more likely when its volatility is higher. The buffer absorbs the same percentage of losses on either index, but losses beyond that are borne by the investor.

Does the Nasdaq-100 include financial companies?

No. The Nasdaq-100 includes the largest non-financial companies listed on the Nasdaq Stock Market by market capitalization and excludes financial companies, including investment companies. The S&P 500 includes financial companies.

Can I hold both an S&P 500 and a Nasdaq-100 buffer ETF?

Yes. Some investors pair them, using the S&P 500 version for broad exposure and the Nasdaq-100 version as a growth tilt. Because many large companies appear in both indexes, the combined exposure can be more concentrated than it first appears.

Do buffer ETFs receive the index’s dividends?

Most buffer ETFs built on price-return index options do not receive the index’s dividends. That is a cost relative to owning the index directly, and its size depends on the index’s dividend yield at the time.

Why does the same buffer feel different on each index?

A 10% move is a smaller event for a more volatile index. When the Nasdaq-100 is expected to swing more, a 10% buffer covers a smaller share of its typical range of outcomes than it does for the S&P 500.

Cite this page: Adam Patti, "Buffer ETFs on the S&P 500 vs. the Nasdaq-100: What Changes?," VistaShares, updated November 13, 2026, https://www.vistashares.com/sp500-vs-nasdaq100-buffer-etfs/. Plain-text version.

This material is provided for educational purposes only. It is not investment, legal or tax advice, and it is not a recommendation or an offer to buy or sell any security. Information is drawn from sources believed to be reliable as of the date of publication, is not guaranteed as to accuracy or completeness, and may change without notice. Figures attributed to third parties are their estimates. Projections and forecasts are not guarantees of future results. Investors should consult their own financial, legal and tax professionals before making investment decisions. Investments involve risk, including possible loss of principal. Strategies that use options involve additional risks, including limited participation in market gains, the risk that options do not perform as intended, and changes in distributions. Tax treatment depends on individual circumstances and on current law, which may change.