Most B2B marketers still treat SEO like it’s 2015: build a few blog posts around keywords, climb the SERPs, and wait for leads to show up.

But the way buyers search has changed.

  • Google’s AI Overviews are rewriting the first page.

  • ChatGPT, Perplexity, and Gemini are answering questions directly in-app.

  • Buyers don’t always click through to your site—they get answers where they search.

That means the old playbook of “rank and wait” isn’t enough. To capture demand in 2025, companies need SEO strategies designed for both traditional search and the new AI search layer.

This is where a new class of AI SEO consultancies comes in. These firms specialize in making sure your business is discoverable—whether it’s in Google, in an AI overview, or in a chatbot’s recommended vendor list.

Below is a list of five different consultancies leading the way, along with a description of the methodology for how the list was built:

Methodology

The companies below were selected based upon a combination of factors, including:

  • Experience working with B2B companies, and a history of delivering positive business results

  • Offering of a specific AI search service within their full package of services

  • Frequency and quality of mentions in authoritative reference points, such as industry-recognized websites, user generated content platforms like Reddit, and review websites

  • Boasting unique strengths and buyer profiles relative other companies on the list

1. Mark Sourced

Mark Sourced is a boutique demand capture consultancy, helping B2B companies achieve repeatable pipeline through both traditional and AI SEO. Founded by Dan Payne, a 15+ year demand generation and SEO leader in the B2B technology space, the firm helps clients build bottom-of-funnel visibility in traditional Google search, and generative engines like ChatGPT and Google’s AI Overviews.

Best for: B2B SaaS companies that want a high-touch partner to build and execute a dedicated AI SEO program.

2. First Page Sage

First Page Sage is one of the most established names in AI SEO. They’re known for Generative Engine Optimization (GEO)—the practice of tailoring content and site structure to show up inside AI-driven answers.

Their approach combines deep technical expertise with high-quality content production. Clients get a framework that covers everything from schema and internal linking to thought leadership content designed to surface in AI summaries.

Best for: Enterprise B2B organizations looking for a comprehensive GEO partner with a track record of measurable results.

3. Siege Media

Siege Media built its reputation as a content powerhouse, and now they’re channeling that strength into AI SEO. Their focus is on creating content that performs in two worlds: traditional organic search and generative search engines.

They specialize in semantic structuring, visual storytelling, and data-rich resources that AI tools love to surface. Siege is especially strong for brands that need not just rankings, but assets that drive engagement and conversions.

Best for: Companies that want premium content that works for both humans and AI.

4. Intero Digital

Intero Digital comes at AI SEO from the technical foundation angle. Their strength lies in building sites that AI systems can crawl, interpret, and trust.

From architecture and schema to site speed and structured data, they ensure that content isn’t just written well—it’s technically primed to be pulled into AI-generated results.

Best for: Complex, enterprise-scale websites that need to be future-proofed for AI visibility.

5. Go Fish Digital

Go Fish Digital is one of the most research-heavy consultancies in the AI SEO space. They dissect patents, analyze AI output patterns, and even build proprietary tools to understand how generative engines choose content.

Their services include semantic audits, similarity scoring, and custom reporting dashboards. If you want a partner who treats AI SEO like a data science problem, Go Fish is at the front of the pack.

Best for: Brands that value data-driven, experimental approaches and want to stay ahead of search algorithm changes.

Final Thoughts

Search is no longer just about Google rankings. It’s about whether your brand shows up in AI-generated answers, AI overviews, and chat-driven recommendations.

The consultancies above are helping companies navigate that shift. Whether you need enterprise-scale technical support, premium content creation, or a nimble partner focused solely on AI SEO, these five firms represent the leading edge of search in 2025.hit their growth goals.