Overview

Amazon sellers need more than sales rank to assess brand health. Two visibility metrics—Share of Voice (SOV) and Share of Shelf (SOS)—measure distinct ways shoppers encounter a product: SOV tracks paid ad impressions for a keyword, while SOS tracks organic listings on search or category pages. Monitoring both metrics lets sellers allocate ad spend wisely, improve listings, and defend market share against competitors.

Key Points

• Share of Voice (SOV) — Calculates the percentage of ad impressions a brand receives for a specific keyword compared with all advertisers bidding on that term; for example, capturing 20 % of impressions for “organic turmeric supplement” means the brand out‑competes three‑quarters of rivals in paid space.
• Share of Shelf (SOS) — Measures the share of organic listings a brand occupies on a results page or category grid; if ten products appear for “wireless earbuds” and three belong to Brand X, the SOS is 30 %.
• Paid vs. organic focus — SOV reflects paid visibility, whereas SOS reflects natural placement; a brand can enjoy a high SOV while its SOS remains near zero, hiding the product from shoppers who ignore ads.
• Conversion boost from overlap — Products that appear in the top three organic spots and hold a sponsored ad can achieve up to 2.5 × higher conversion rates than items that only have one of those signals.
• Avoiding blind spots — Tracking both metrics prevents wasted ad spend on keywords with low organic presence and stops missed opportunities where competitors dominate the organic shelf.

How Share of Voice Works

1. Keyword selection — Choose the target keyword to evaluate, such as “vegan protein powder.”
   • Example: A seller adds “vegan protein powder” to a Sponsored Products campaign to test paid performance.
2. Impression aggregation — Amazon records every ad impression delivered for that keyword across all advertisers during a defined period.
   • In a 24‑hour window, the keyword generates 50,000 total ad impressions.