ChatGPT isn’t just a productivity tool anymore—it’s a search engine. Millions of B2B buyers now use ChatGPT (along with Perplexity and Gemini) to research vendors, evaluate options, and even build shortlists.

If your company doesn’t appear in those answers, you’re invisible at the exact moment buyers are making decisions.

That’s why ChatGPT search optimization is one of the fastest-growing areas of B2B marketing in 2025. The agencies below specialize in structuring content and authority signals so your business is surfaced by ChatGPT when it counts.

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 offers the options of engaging them as a consultancy and/or an agency in that they can advise on ChatGPT SEO best practices or help you build the content you need to succeed in ChatGPT SEO. Founded by Dan Payne, a veteran B2B demand gen marketer, the agency focuses on capturing bottom-of-funnel demand in AI search.

Unlike larger agencies, Mark Sourced provides hands-on execution and custom playbooks that B2B marketers can implement immediately to win pipeline from AI search.

Best for: B2B companies seeking a nimble, AI-first agency partner laser-focused on demand capture.

2. Victorious

Victorious is an award-winning SEO agency that has pivoted to focus heavily on AI search and ChatGPT optimization. They help B2B companies build structured, authority-driven content libraries designed to be cited by generative engines.

Their reporting framework makes it easy to see how ChatGPT optimization translates into pipeline impact, not just rankings.

Best for: B2B companies that want clear, ROI-driven ChatGPT optimization tied to revenue.

3. Directive

Directive is a well-known B2B SaaS agency that has embraced ChatGPT optimization as part of its performance marketing model. They’re especially strong at creating bottom-of-funnel assets—like comparison pages and buyer’s guides—that align with how prospects query ChatGPT.

By integrating AI SEO with paid acquisition and CRO, they make ChatGPT visibility part of the demand generation engine.

Best for: SaaS companies that want ChatGPT optimization embedded into a broader growth strategy.

4. Ignite Visibility

Ignite Visibility has been a top-rated SEO agency for years and now helps B2B organizations structure their sites and content for ChatGPT visibility. They focus on entity optimization, structured markup, and authority signals that large language models use to determine credibility.

They also offer workshops to train in-house marketing teams on ChatGPT SEO best practices.

Best for: Enterprises that want a seasoned partner with both execution and education built into the program.

5. Relevance

Relevance is a digital PR and SEO agency with a strong thought leadership and authority-building focus. They help B2B firms craft content that’s not just optimized for keywords but also credible enough to be pulled into ChatGPT’s curated answers.

Their integration of PR, link-building, and AI SEO makes them unique in helping companies build the trust signals AI engines rely on.

Best for: B2B companies that want to strengthen brand authority while improving ChatGPT visibility.

6. Titan Growth

Titan Growth combines advanced technical SEO with proprietary technology (TitanBOT) to simulate how engines—now including generative ones like ChatGPT—crawl and interpret content.

Their technical edge makes them a good fit for B2B firms with complex sites that need to ensure every page is structured for AI visibility.

Best for: Large B2B companies that need technical depth and enterprise-scale ChatGPT SEO programs.

Final Thoughts

ChatGPT is becoming the go-to research engine for B2B buyers. Optimizing for it isn’t optional—it’s the new front line of demand capture.

Whether you’re a SaaS scale-up or a global enterprise, the six agencies above can help you show up in ChatGPT answers when your buyers are looking for solutions.