---
title: "SPI: Methodology"
description: "SPI is maintained by SIX and covers broad swiss equity benchmark. How the index selects and weights its constituents, and what that means for what it measures."
canonical: https://www.getswoopr.com/stocks/indexes/spi/
source: "Swoopr Investment: https://www.getswoopr.com"
---

# SPI: What It Measures and How It Is Built







## Direct Answer



> The SPI is a rule-based measurement of broad swiss equity benchmark, maintained by SIX. Like every index it owns nothing: it is a number produced by applying a published weighting formula to a selected list of companies, revised on a schedule the provider sets.








## What this index covers



The SPI covers broad swiss equity benchmark, within the Switzerland market. SIX defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number.



The index name does not state a fixed company count, so the number of constituents follows the eligibility rules rather than a target.








## How constituents are weighted



Swoopr has not verified the weighting method for this index against SIX's current methodology document, so none is stated here rather than guessed. The provider link below is authoritative.








## Current SPI constituents



SIX publishes and licenses the SPI constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.



[SIX: official SPI page](https://www.six-group.com/en/products-services/the-swiss-stock-exchange/market-data/indices.html)








## Related reading



- [All stock market indexes](https://www.getswoopr.com/stocks/indexes/): how indexes are built, weighted and revised.
- [Europe indexes](https://www.getswoopr.com/stocks/indexes/europe/): others covering the same region.
- [Index concentration](https://www.getswoopr.com/technical-analysis/market-concentration/index-concentration/): measuring how much of an index sits in its largest holdings.
- [Index rebalancing and inclusion effects](https://www.getswoopr.com/stocks/corporate-actions-catalysts/index-rebalancing-and-inclusion-effects/): what happens to a stock when index membership changes.








## Frequently Asked Questions


### Who maintains the SPI?



SIX maintains the SPI and publishes the methodology document that defines its eligibility and weighting rules.




### What does the SPI measure?



It measures broad swiss equity benchmark. The index is a calculated number applying a weighting formula to a selected list of companies, and it holds nothing itself.




### Where can I see the current SPI constituents?



SIX publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence.











## About the author



The [Swoopr Editorial Team](https://www.getswoopr.com/authors/swoopr-editorial-team/) writes Swoopr Investment's educational library, covering market structure, analysis methods and the mechanics behind the numbers investors read every day.



Our [editorial policy](https://www.getswoopr.com/legal/editorial-policy/) and [corrections policy](https://www.getswoopr.com/legal/corrections-policy/) set out how this content is produced, reviewed and fixed when it is wrong.