What is Share of Voice (SOV meaning)?
Share of Voice is one of the few media metrics with a documented link to business growth. Used well, it tells a brand whether it is out-shouting or being out-shouted in its category — and, over time, whether that gap is likely to move market share.
Share of Voice (SOV) is a brand's advertising presence as a proportion of its category's total advertising, usually expressed as a percentage. Share of Market (SOM) is the brand's actual share of category sales. The two are related but distinct: SOV measures visibility, SOM measures the result. Raising SOV can lift SOM over time, but the popular assumption that the two move in lockstep is wrong — and the gap between them is where the strategy lives.
How to measure Share of Voice
Divide your brand's ad spend by total category ad spend, then multiply by 100. If four brands compete and yours accounts for 40% of category advertising, your SOV is 40%.
The inputs depend on the medium. In traditional media, SOV is built from paid advertising — spend, GRPs, or impressions relative to competitors. In digital, the picture broadens to include organic search visibility, branded mentions, and social engagement, giving a fuller read on presence but making apples-to-apples comparison harder. Define which media you're counting before you benchmark, or the number means little.
Why SOV matters for advertisers and CMOs
- It quantifies competitive presence. SOV shows how loud a brand is in its category relative to rivals, which is the precondition for awareness and salience.
- It signals investment posture. A high SOV indicates a brand is spending to be seen; a falling SOV often precedes a fall in awareness before it shows up in sales.
- It is a planning input, not a vanity number. Read against SOM, it tells you whether your spend is set to defend, hold, or grow.
The limits of SOV
- High SOV does not guarantee success. A brand can dominate the airwaves and still fail to convert attention into preference or sales.
- SOV is not a proxy for health. A smaller-SOV brand can out-perform a louder one on loyalty, product, distribution, or service.
- Chasing SOV in isolation hits diminishing returns. It works when paired with a product and experience worth the attention it buys.
SOV vs SOM and the excess-share-of-voice growth model
The most useful thing SOV predicts is the direction of market share — and the mechanism is the gap between the two metrics. When a brand's SOV exceeds its SOM, it tends to grow; when SOV sits below SOM, it tends to decline. That gap is called Excess Share of Voice (ESOV).
The model comes from Les Binet and Peter Field's effectiveness work for the IPA ("The Long and the Short of It," 2013; "Media in Focus," 2017), built on the IPA Databank of case studies. Their headline finding: on average, every 10 points of ESOV correlates with roughly 0.5 points of annual market-share growth, though the return varies widely with brand size, category, and — crucially — creative quality, which can multiply it. It is a planning guideline, not a guarantee.
Lidl in the UK is the textbook case. In 2014 the chain ran a ~9% SOV against a ~3% SOM — a large positive ESOV — yet market share grew slowly at first. Two barriers explained the lag: brand perception (shoppers equated low price with low quality) and brand size (a small brand has to overspend to be noticed). Only after trial did loyalty build. Sustained ESOV eventually doubled Lidl's market share over roughly five years — proof that ESOV drives growth, but on a lag, not on a switch.
Tools for measuring Share of Voice
Platforms such as Semrush, Brandwatch, and Google Analytics track elements of SOV across paid, organic, and social. When choosing a tool, weigh media coverage, data accuracy, and how cleanly it integrates with your existing measurement. No single tool captures paid, owned, and earned presence in one view, so most brands triangulate — and hold the definition constant across periods so the trend is real.
Share of Voice in organic search
In SEO, Share of Voice is the share of total possible organic clicks or visibility a brand captures for its target keyword set versus competitors. Growing it comes down to publishing genuinely useful content for the terms your target audience searches, earning links and citations, and tracking competitors' movement on the same keywords over time.
How to increase Share of Voice
- Know the audience. Build messaging around the real needs and decision criteria of your target audience, not around what the brand wants to say.
- Commit to consistent content. A steady stream of relevant content across the channels your buyers use compounds presence far more than sporadic bursts.
- Use social deliberately. Engage, distribute, and join category conversations rather than broadcasting into them.
- Partner with credible voices. Influencers and category experts extend reach to audiences that trust them.
- Watch competitors. Track their SOV so you can find the gaps they're leaving and the ground they're taking.
- Invest in paid media. Disciplined paid media is the fastest lever on SOV — and the one that builds the ESOV a growth plan depends on.
Building Share of Voice takes time, consistency, and a clear read of where you sit against the category. Measured against SOM and managed as ESOV, it becomes one of the few leading indicators a CMO can act on before sales data catches up.
Sources & further reading:
- IPA | The Key Works of Les Binet & Peter Field
- Mark Ritson | Effie Awards Case Study – Lidl
- Criterion Global | The Paid Media Agency a CFO Would Build