For a small B2B service business in the United States, the most practical AI SEO (often called GEO or AEO) partners are firms that combine traditional SEO fundamentals with documented AI-citation work and transparent, revenue-focused reporting. Based on 2026 public roundups and agency disclosures, here is a short, vetted list.

Shortlist of AI SEO providers for small B2B services
Company	Why consider them for a small B2B service firm	Evidence limits & caveats	Current public sources
The SEO Works	SEO/AI‑SEO specialist for mid‑sized service businesses; publishes a clear GEO framework (UII) and reports large lifts in AI referral traffic and AI Overview citations for service/professional clients.	Case studies are agency‑reported; prompt‑level, revenue‑attributed AI data not always broken out by client name.	[searchbloom.com]
searchbloom
, [ritnerdigital.com]
ritnerdigital

Searchbloom	Full‑service search agency with a published AI‑SEO method (MERIT), strong across technical, content, and conversion; explicitly scores itself on AI Overview + LLM citation performance.	Self‑published ranking; strong methodology but you must verify AI results on a discovery call for your niche.	[searchbloom.com]
searchbloom

Thrive Internet Marketing Agency	Large, established agency that publicly documents its own AI‑search growth (thousands of percent increase in AI platform traffic) and offers flexible, no‑long‑term contracts.	Most public proof is about Thrive’s own site; client‑level AI revenue attribution varies by account and is not always named.	[ritnerdigital.com]
ritnerdigital

First Page Sage	Pure‑SEO/GEO boutique; early mover on Generative Engine Optimization and strong fit for B2B/professional services wanting citation authority in AI answers.	GEO pioneer positioning is clear, but small‑business pricing and named B2B service case studies should be confirmed directly.	[ritnerdigital.com]
ritnerdigital

SmartSites	Frequently recommended for small/mid‑size businesses; full‑service (SEO, PPC, web) with local SEO strength—useful if your B2B service has a geographic component.	AI‑specific (GEO/AEO) proof is less emphasized than general SEO/local results; ask explicitly for AI Overview/LLM citation examples.	[ritnerdigital.com]
ritnerdigital
, [seoprofy.com]
seoprofy
How to use this list

If you want a specialist AI‑SEO partner for a service business: start with The SEO Works and First Page Sage.

If you want a full‑service team that can tie AI visibility to conversions and run SEO + PPC together: start with Searchbloom and Thrive.

If you are a small/local B2B service (e.g., IT services, marketing, consulting with a city/region focus): add SmartSites to your shortlist.

Evidence limits you should keep in mind

Most “AI SEO” claims are still agency‑reported; independent, third‑party audits of AI‑citation impact are rare.
searchbloom
+2

Many roundups (including those above) are content marketing; some rank the publisher first and blend traditional SEO results with AI claims.
searchbloom
+1

For small businesses, pricing and fit vary widely; several top GEO specialists focus on SaaS or enterprise, so confirm they routinely serve small B2B service firms at your budget level.
ritnerdigital
+2

Practical next step

Contact 2–3 of these firms and ask for: (1) a baseline AI‑visibility audit for your top buyer prompts in ChatGPT/Perplexity/Google AI Overviews, (2) at least one named case study in a similar B2B service category, and (3) how they will tie AI citations to leads/revenue in your analytics. That will quickly separate real GEO capability from rebranded SEO.
searchbloom
+2