Single-Stock Indices: How a Single Share Becomes an Index

Single-stock indices are a relatively new but increasingly important category in the index universe. Traditional indices track an entire market or segment, such as the SMI or the SPI. By contrast, a single-stock index focuses on just one thing: the price performance of a single share.

A single-stock index tracks the performance of an individual share, such as Nestlé or Novartis. It usually closely follows the share’s price movement. It may also account for dividends, either gross or net, depending on the index concept. Other possible adjustments include stock splits, capital increases, as well as currency conversions if the share is listed in a foreign currency.

A single-stock index serves as a standardized calculation basis for financial products and investment solutions. Its clear structure means that the technical details of corporate actions do not have to be managed separately.

The benefits of single-stock indices are less evident in ordinary equity investing and more in the products built on these indices. Single-stock indices are often used as reference values for structured products. Examples include barrier reverse convertibles and tracker certificates on a single share. They also serve as the basis for derivatives such as warrants or options. In these products, the payout mechanism is standardized and linked to an index. A single-stock index can also provide a transparent benchmark for an equity-based investment strategy. In addition, it can be also used to calculate another index with a decrement value that serves as a synthetic dividend. Both indices can serve as an underlying for a structured product.

Issuers may use a single-stock index instead of linking a product directly to the underlying share. The index follows clearly documented rules, allowing it to be calculated in a standardized and transparent manner.

The basic idea is simple. The index starts at a defined point in time with a set initial value, such as 100 points. From then on, its performance is calculated as if the corresponding share were held in a portfolio since then.

Typically, share price movements are reflected one-to-one. Dividends are either reinvested in a total return index or shown separately in a price index. Corporate actions, such as splits or rights issues, are incorporated without creating an artificial jump in the index.

Investors therefore see an adjusted price history. It remains consistent and comparable, even over several years.

Single-stock indices do not change the basic risk-return profile of a share: they simply package it in a different form.

Advantages:

• Eliminates funding mismatch: Calculating directly in Swiss francs removes interest rate differences between high-rate USD/EUR and low-yield CHF. This helps lower the costs built into options.
• Higher coupons and protection: Lower financing costs give issuers more flexibility. They can offer higher coupons, stronger downside protection, or improved auto-call probabilities.
• Better economic terms: Converting the currency at index level can reduce option premiums. This may provide greater upside potential or enable customized risk profiles.
• No foreign exchange costs: Swiss investors can gain deeper downside protection, shorter product durations, or increased auto-call probabilities. Foreign exchange costs do not erode the returns.

Disadvantages:

• Single-name risk: The risk of a single share remains, even in index form. There is no diversification. Company-specific news can have a major impact.
• Product complexity: Products based on single-stock indices can be complex. Investors must understand both the index and the product mechanics, such as barriers, caps, and maturities.