Share of Authority (SoA) is a visibility metric that measures how often a website is selected as a trusted source by AI-powered search systems compared with competing websites covering the same topic.
Instead of measuring only traffic or search rankings, Share of Authority focuses on AI citations and source selection across AI-generated answers. It helps answer a different question: How much authority does my website hold within a specific topic compared with my competitors?
What Does SoA Mean?
SoA stands for Share of Authority. It is an abbreviation commonly used in AI visibility dashboards and citation analytics tools to represent the percentage of authority or citation share that belongs to your website within a specific topic or query set.
For example, if an AI visibility report shows SoA: 15%, it means your website received 15% of all tracked AI citations within that measured topic compared with competing websites.
Because dashboards often display the abbreviated form, understanding SoA (Share of Authority) is essential when interpreting AI visibility reports and competitive citation analysis.
Why Share of Authority Matters
AI assistants such as ChatGPT, Microsoft Copilot, Gemini, Claude, and other AI-powered systems increasingly choose a limited number of websites when generating answers. Being included in those citations can become an important visibility signal.
Share of Authority measures your share of those citations within a defined topic or query set.
A Simple Example
Imagine AI systems generate answers across 100 related queries about weight management supplements.
If your website is cited 15 times, your Share of Authority is 15%.
A competitor cited 30 times would have a Share of Authority of 30%, while another site cited only 5 times would have 5%.
This makes SoA a competitive visibility metric rather than a simple traffic metric.
Share of Authority vs AI Visibility
AI Visibility measures how visible your website is across AI-powered search and discovery systems.
Share of Authority is one of the metrics that helps quantify that visibility.
AI Visibility is the broader concept; Share of Authority is one way to measure competitive performance within that concept.
What Influences Share of Authority?
AI systems tend to cite websites that demonstrate strong topical authority and trust signals.
Important factors may include:
- Comprehensive topical coverage
- High-quality original content
- Trusted backlinks and editorial references
- Consistent entity recognition
- Clear semantic structure
- References from authoritative websites and directories
- Strong overall Website Visibility
Why a 15% Share of Authority Can Be Significant
A Share of Authority of 15% may appear modest at first glance, but context matters.
In highly competitive industries such as software, AI tools, health, supplements, finance, or weight management, AI citations are often distributed across many authoritative websites.
Capturing 15% of all AI citations within a competitive topic can indicate a strong level of topical authority and recognition by AI systems.
How to Improve Share of Authority
Improving Share of Authority usually requires strengthening the same signals that improve AI Visibility and Website Visibility.
- Create authoritative topical resources
- Publish original research and comparisons
- Improve internal linking between related content
- Earn backlinks from trusted industry websites
- Build citations across relevant directories and platforms
- Strengthen brand and entity recognition
- Maintain consistent topical expertise over time
Related Resources
Browse all guides, strategies, and website growth resources in the Search Group Resources library.
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