---
title: "S&P Merval 25: Methodology"
description: "S&P Merval 25 is maintained by S&P Dow Jones Indices/BYMA and covers top 25 most actively traded companies on the Buenos Aires Stock Exchange."
canonical: https://www.getswoopr.com/stocks/indexes/sp-merval-25/
source: "Swoopr Investment: https://www.getswoopr.com"
---

# S&P Merval 25: What It Measures and How It Is Built

## Direct Answer

> The S&P Merval 25 is a rule-based measurement of top 25 most actively traded companies on the Buenos Aires Stock Exchange, maintained by S&P Dow Jones Indices/BYMA. 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 S&P Merval 25 covers top 25 most actively traded companies on the Buenos Aires Stock Exchange, within the Argentina market. S&P Dow Jones Indices/BYMA defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number.

The name states a target of 25 companies. A target is not a guarantee of the exact count on any given day: corporate actions, dual share classes and pending additions all move the real number around it.

## How constituents are weighted

Swoopr has not verified the weighting method for this index against S&P Dow Jones Indices/BYMA's current methodology document, so none is stated here rather than guessed. The provider link below is authoritative.

## Current S&P Merval 25 constituents

S&P Dow Jones Indices/BYMA publishes and licenses the S&P Merval 25 constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.

[S&P Dow Jones Indices/BYMA: official S&P Merval 25 page](https://www.spglobal.com/spdji/en/index-family/equity/latin-america/)

## Related reading

- [All stock market indexes](https://www.getswoopr.com/stocks/indexes/): how indexes are built, weighted and revised.
- [Emerging Markets indexes](https://www.getswoopr.com/stocks/indexes/emerging-markets/): 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 S&P Merval 25?

S&P Dow Jones Indices/BYMA maintains the S&P Merval 25 and publishes the methodology document that defines its eligibility and weighting rules.

### What does the S&P Merval 25 measure?

It measures top 25 most actively traded companies on the Buenos Aires Stock Exchange. 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 S&P Merval 25 constituents?

S&P Dow Jones Indices/BYMA 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.