Share of voice by market is a brand's share of the category's content or spend, measured inside one market at a time and never pooled across borders. Read that way, one category tells several stories: in SOMIN's four-market Coca-Cola read, Foodie creators put 62.9% of their Indian content into home cooking, while the cola category put 0% there.
Key takeaways
- Measure share of voice inside each market's own cohort; a pooled global figure is dominated by the loudest market.
- Track three cohorts, brand, competitors and creators, because whitespace only shows up when you can see all three.
- Read share and volume together, and check trends against the prior year before calling a decline.
- Treat social share of voice as content supply, not consumer demand, and engagement as the size of a reaction, not who reacted.
- Report the same core metrics in every market so that the differences mean something.
What is share of voice, and why measure it by market?
Share of voice is your share of everything the category puts out in a defined market, channel and period. Measuring it by market matters because buyers only ever see the competitors in their own market.
The classic version uses media spend. Nielsen defines a brand's share of voice as its media spending expressed as a percentage of all media expenditure in the category, in that market, on that channel. It also cites Binet and Field's study of 171 campaigns, in which a brand typically gained 0.5% market share for every 10% of excess share of voice.
Note the words "in that market". SOMIN measures content share of voice from published posts and ads, which shows what brands and creators supply to an audience. We read it as content supply, not consumer demand, and we compute it market by market because each market has its own competitive set.
Why does a pooled global number mislead?
A pooled number hides the markets that matter most, because the loudest market sets the average. The Land Rover Defender read across the UK, Japan and the US shows how far off it can be.
In each market's 90-day cohort, Defender held 13% share of voice in the UK (15 of 115 posts), 0% in Japan (0 of 63) and 22% in the US (17 of 76). Competitors held 62%, 67% and 71% respectively, and creators 25%, 33% and 7%. Pool the three markets and Defender's share comes out at about 13%, which looks like the UK, hides Japan's zero and understates the US.
Engagement is even more lopsided: 538,234 in the UK, 40,756 in Japan and 1,619,446 in the US. Pooled, the US would account for nearly three quarters of all engagement, and Japan, where the Defender case study found the largest opportunity, would barely register.
How does one category read four ways?
The same category, the same brand and the same audience produced four different maps in SOMIN's Coca-Cola read. Each market had Coca-Cola, two to five soft-drink competitors and five to seven Foodie creators, read across eight content strands from June 2025 to May 2026.
- India: home-cooking enablement made up 62.9% of Foodie-creator content, while Coca-Cola and its competitors each had 0.0% there. Coca-Cola put 57.1% of its own voice into shared celebration.
- United Kingdom: creators split 48.2% home cooking and 43.7% regional discovery, with the cola category at 0.0% on both. Coca-Cola put 69.2% of its voice into shared celebration.
- Mexico: authentic and regional culinary discovery took 76.8% of creator content, with neither Coca-Cola nor its competitors publishing in that strand.
- South Africa: the same discovery strand reached 82.9% of creator content, again with the category absent.
The verdict type was the same everywhere, culinary whitespace, but the pillar was not. Home cooking leads in India, discovery leads in Mexico and South Africa, the UK splits between them, and celebration is defended in Mexico and South Africa where Coca-Cola already has a voice. The Coca-Cola case study sums it up: Coca-Cola owns the table, the Foodie creators own the kitchen.
Why should you read share and volume together?
Share alone can tell the wrong story, because a cohort's mix can change while its output grows. Always check the count behind the percentage.
In the Coca-Cola India read, the share of creator content on authentic and regional discovery fell from 81% to 37% across the year, but total creator volume grew from 48 to 559 posts. That is a composition effect, not a decline. In the Pepsi India read, the creator, brand and competitor cohorts differed in size by up to 27.6 times, so SOMIN compared each cohort's share of its own content rather than raw counts. The same read verified every trend against the prior year: the category's food-pairing content fell from 34% to 0%, confirmed as a real decline rather than a season.
What should you measure in each market?
Use one set of metrics in every market, so that a difference between markets reflects the market and not the method. The table sets out a default set, drawn from the metrics used in SOMIN's Defender, Coca-Cola and Pepsi reads.
| Metric | How to calculate it | What it tells you |
|---|---|---|
| Brand share of voice | Brand posts or ads divided by all category posts or ads in that market and window | How loud you are locally |
| Competitor and creator share | The same calculation for each cohort | Who is setting the conversation |
| Strand share of own output | A cohort's posts on one strand divided by that cohort's total posts | What each cohort talks about, independent of its size |
| Volume per window | Post count per month or quarter | Whether a falling share is a real decline |
| Engagement per strand | Total reactions on the strand's posts | That a reaction of some size occurred, not who reacted |
| Prior-year check | The same window one year earlier | Season or trend |
| Whitespace verdict | Brand low, competitors low, creators or another audience signal present | Where to lead |
| Confidence flag | Sample size per cohort against a minimum | When a verdict is too thin to act on |
How do you report share of voice without overclaiming?
Report what the numbers can carry and label the rest. Three rules keep a per-market report honest.
First, a low share is not automatically an opportunity. In the Defender US read, the largest tension in the study ran to 122 posts and Defender already held 23% of it, yet the verdict was Blocked because rival brands owned the frame.
Second, share of voice is not impact. In SOMIN's own social-listening workspace, a 30-day whitespace study of 411 posts (October 2026) found a 99-post theme on the challenges of AI in marketing and social media. SOMIN published 12 of those posts, about 12% of the theme, and they drew 8 engagements in total; one larger social-media-management brand with the same 12 posts drew 349. Being present is the first step, not the result.
Third, new channels need the same discipline. Marketing Week columnist Tom Roach defines share of model as a brand's mentions by large language models as a proportion of all brand mentions in its category. As answer engines become a discovery channel, measure that share market by market and language by language as well, rather than as one global score.
SOMIN's reporting agent turns these metrics into a self-serve report in the client's language, with period-on-period comparison, so each market's numbers stay separate by default. For the upstream step of collecting rivals' ads, see our guide to competitor ad analysis by market.
FAQ
How do you calculate share of voice by market?
Count the brand's posts, ads or spend in one market and one period, and divide by the category total for the same market and period. Repeat for each competitor and for a creator panel, and never add markets together before dividing.
What is a good share of voice?
For media spend, the common benchmark is share of voice relative to market share: Nielsen, citing Binet and Field, notes that brands with share of voice above their market share tend to grow. For content, a good share is one that sits in the strands your audience cares about.
Is social share of voice the same as media share of voice?
No. Media share of voice measures spend; social or content share of voice measures what is published. Both are supply-side measures, and neither tells you on its own how the audience reacted.
How often should share of voice be measured?
Monthly or quarterly windows work well, with a prior-year comparison before any trend is reported. SOMIN's Pepsi India read used 12 monthly windows, each checked against the same months a year earlier.
Choose two markets you already report on together and split them this quarter: brand, competitors and creators, share and volume, with a prior-year check. If the two maps look the same, your combined report is fine. If they do not, the combined number has been hiding a decision.
