Exchange-traded notes (ETNs) linked to volatility indices — most notably those tracking the VIX — carry unique and potentially extreme risks that investors must thoroughly understand before using them. Unlike exchange-traded funds (ETFs), which hold actual securities, ETNs are unsecured debt instruments issued by a bank — meaning they carry issuer credit risk in addition to the market risks of the underlying volatility index. More significantly, leveraged and inverse volatility ETNs can lose most or all of their value within a single trading day during volatility events.

Contango Decay: The Silent Erosion

Long VIX ETNs that hold VIX futures contracts suffer from contango decay in normal market conditions. When the VIX futures curve is in contango (near-term futures cheaper than longer-dated futures), rolling the position from expiring near-term contracts into longer-dated ones costs money — the fund sells cheap and buys expensive on each roll. Over time, this decay can be severe: certain VIX ETNs have lost 90%+ of their value over multi-year periods even during periods of only moderate overall equity market returns, solely due to the contango erosion of their futures position.

Event Risk: Sudden, Extreme Losses

Inverse and leveraged short-volatility ETNs faced catastrophic losses during the “Volmageddon” event of February 5, 2018: the XIV (inverse VIX ETP) fell 93% in after-hours trading as the VIX spiked dramatically. The Credit Suisse XIV was subsequently closed. These products’ risks are genuinely asymmetric in the negative direction: they generate consistent small gains in calm markets but face the risk of nearly complete loss in severe volatility events. Position sizing must reflect this asymmetric tail risk.

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