Nasdaq Managed Volatility Indexes Explained in Plain English

Nasdaq quietly launched two new indexes on July 31, and their names are a small wall of jargon: the Nasdaq-100 30% Managed Volatility 4% Decrement Index and the Nasdaq-100 40% Managed Volatility 6% Decrement Index. Nobody says that out loud twice. But the mechanics behind those words are worth understanding, because indexes shaped like this are the raw material for a lot of structured products that eventually reach retail investors.

• Two new indexes launched effective July 31, 2026: tickers XNDNXM304 and XNDXM406
• Both track the Nasdaq-100 Total Return Index, targeting 30% and 40% volatility levels respectively
• Realized volatility is calculated from both historical component and intraday reference component prices
• Distributed via Nasdaq GIDS, Global Index Watch and FlexFile Delivery, with no component-level data published

What Does "Managed Volatility" Actually Mean?

A managed volatility index does not hold a fixed basket. It adjusts its exposure to the underlying index — here, the Nasdaq-100 Total Return Index — to keep measured volatility near a target level. When the market gets choppy and realized volatility rises above the target, exposure comes down. When things calm down, exposure goes back up.

The target is the number in the name. A 30% target index will dial exposure down sooner than a 40% target index, because it is aiming at a smoother ride. Neither is inherently better; they are different points on the same dial.

What is notable in Nasdaq's methodology is the use of both historical component prices and intraday reference component prices to calculate realized volatility. Intraday data means the index can react to changing conditions faster than a purely end-of-day calculation would allow — which matters most precisely when markets move fastest.

What Is a Decrement, and Why Is It There?

This is the part that trips people up. A decrement index subtracts a fixed amount — 4% or 6% per year in these two cases — from the index's return, continuously. It is not a fee that goes to anyone. It is a structural feature.

The reason it exists is pricing. These indexes are built to underlie structured products, and a bank writing options on an index needs to model dividends. Dividends are uncertain and moving, and that uncertainty has to be priced in somewhere. A decrement replaces variable dividend assumptions with a fixed, known deduction, which makes the index far cheaper and simpler to write derivatives against. The savings show up as better terms on the resulting product.

The trade-off is straightforward and you should understand it before touching anything built on one: a decrement index will always lag its parent index by the decrement rate. A 6% decrement means the index gives up 6 percentage points of annual return in exchange for making the derivative pricing cleaner. Whether that is a good deal depends entirely on what the structured product offers you in return — typically some form of downside protection or enhanced participation.

Who Are These Indexes For?

Not for direct investment. Nasdaq is not publishing component-level data for either index, and they are distributed through institutional feeds — Nasdaq Global Index Data Service, Global Index Watch and FlexFile Delivery. These are inputs for product manufacturers: insurers building registered index-linked annuities, banks structuring notes, and issuers designing defined-outcome products.

That is exactly why retail investors should care about the vocabulary even if they never see the ticker. When a structured note or an indexed annuity is pitched to you with a Nasdaq-100 linkage, the specific index behind it determines what you actually get — and "Nasdaq-100 with a 6% decrement and 40% managed volatility" is a materially different exposure than the plain Nasdaq-100. Two products can both claim Nasdaq-100 linkage and behave nothing alike.

The Practical Takeaway

Read the index name. Every word in it is doing work. "Managed volatility" tells you exposure will move around. The percentage after it tells you how aggressively. "Decrement" tells you a fixed annual drag is baked in, and the number tells you how much.

This is the same principle we walked through in our explainer on custom indexing and building a personal ETF: the index construction is not a technicality, it is the product. More coverage of how market plumbing shapes what reaches investors is in our stock trading section.

Sources: Nasdaq Trader — July 31, 2026; Nasdaq Global Indexes — accessed August 2, 2026.