This is what I've found.

Nota: El concepto de Value Share (Participación de Valor) es similar al anterior, únicamente que se hace sobre Facturación.

http://alvarojchacon.com/2010/04/indicadores-de-mercado-mark...

The amount of money that a company makes selling its products or services compared to the amount of money that others make:

https://dictionary.cambridge.org/dictionary/english/value-sh...



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Note added at 1 hr (2019-03-20 00:24:40 GMT)
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Kinds of Market Share
There are two types of market share: value and volume. A value market share is described by the business’ overall shares out of its accumulated segment sales. On the contrary, a volume market share pertains to the exact quantity of the units the entity markets against the overall number of units sold in the market. The equation for the value-volume market share is not always linear. A value market share can be high while the volume market share is low.

Market Volume = Number of Target Consumers x Penetration Rate

On the other hand, the market value can be identified using this equation:

Market Value = Market Volume x Average Value

https://nationalpublicresearch.com/survey-types/market-share...

Market share is the proportion of total sales a company claims to have in a particular market over a specified period, i.e. the size of a business relative to the size of the industry. Total sales may be measured by volume (unit share) or value (revenue share).

Marketing managers tend to follow both measures, i.e., sales volume and sales value, closely. A survey of almost 200 senior marketing managers found that 67% found the ‘dollar share’ metric very useful, while 61% found the ‘unit share’ very useful.

The share may be a measure of percentage of total sales in a city, region, country, or continent. It may also be a percentage share of the global market.

Calculating market share – volume or sales value

https://marketbusinessnews.com/financial-glossary/market-sha...