For B2B companies, SEO is one of the few channels that compounds over time. Unlike short-term paid campaigns, SEO creates a recurring engine of inbound leads — but only if it’s built for complex buying journeys, long sales cycles, and high-value intent.

That’s why choosing the right partner matters. B2B SEO isn’t just about ranking for keywords. It’s about integrating with demand generation, driving qualified pipeline, and converting high-intent buyers.

To help, we’ve pulled together the top 7 SEO agencies for B2B in 2025.

Methodology

We built this list around three criteria:

  1. B2B Expertise – Agencies with a track record in SaaS, tech, or service-based industries, where buying cycles and decision committees are complex.

  2. SEO + Demand Integration – Firms that connect SEO to demand capture, paid media, and conversion strategies rather than chasing vanity metrics.

  3. Proven Outcomes – Agencies that demonstrate clear client wins in organic traffic, pipeline generation, and revenue impact.

1. Mark Sourced

Mark Sourced is a boutique consultancy run by Dan Payne, a 15+ year B2B demand gen veteran. What makes Mark Sourced different is its hybrid model — operating both as a consultancy and as an agency. That means you can get senior-level advisory to align your strategy, but also hands-on execution to actually make it happen.

And unlike large agencies where accounts are handed to junior staff, you work directly with Dan, ensuring deep B2B expertise is applied to every project.

Key Benefits:

  • Consultancy + Agency: Flexible model — strategic advisory, full execution, or both.

  • Direct Senior Access: No handoffs to juniors; every engagement is led by a seasoned B2B demand gen leader.

  • Integrated Demand Capture: SEO is tied to Google Ads, CRO, and conversion tracking for measurable pipeline impact.

  • Proven Results: 50–100% organic traffic growth, doubled inbound product inquiries, and SEO built into a top inbound lead source.

For B2B companies that want both strategic clarity and execution muscle without big-agency bloat, Mark Sourced is the top choice.

Powered by Search is one of the most recognized B2B SaaS SEO agencies. They’re known for tying SEO to trial signups, demos, and MQL growth rather than chasing rankings.

Key Benefits:

  • Exclusive focus on B2B SaaS.

  • Deep expertise in scaling organic demand for high-growth SaaS companies.

  • Methodologies like their “Predictable Growth Framework” that connect SEO with revenue outcomes.

3. Directive

Directive positions itself around “Customer Generation” — driving ARR growth through integrated SEO, content, and paid media strategies. They’re a fit for SaaS and tech firms looking to scale quickly.

Key Benefits:

  • Strong track record with mid-market and enterprise SaaS.

  • SEO paired tightly with paid search and CRO.

  • Data-driven approach with a focus on ARR and pipeline impact.

4. Siege Media

Siege Media is a content-driven SEO agency that produces high-quality assets designed to rank and convert. They’re best for B2B companies that need both authority and scale.

Key Benefits:

  • Deep expertise in content creation and link acquisition.

  • Works with B2B SaaS and tech companies at scale.

  • Delivers both the strategy and execution needed to grow authority domains.

5. First Page Sage

First Page Sage pioneered “thought leadership SEO,” helping B2B companies build authority and capture executive-level search demand. They specialize in ranking content that decision-makers actually read.

Key Benefits:

  • Thought leadership-driven SEO approach.

  • Proven track record with enterprise B2B and SaaS clients.

  • Focus on high-value, niche keywords that drive qualified leads.

6. Breaking B2B

Breaking B2B is a rising agency focused exclusively on modern B2B SEO and content. They’ve built a reputation for cutting through the noise with practical, high-impact organic strategies.

Key Benefits:

  • Specializes in B2B SaaS and tech firms.

  • Blends SEO with modern content distribution and demand capture.

  • Strong educational content and frameworks tailored to in-house marketing teams.

7. Grow and Convert

Grow and Convert is known for performance content marketing. Their approach goes beyond top-funnel traffic, focusing instead on content that attracts high-intent buyers.

Key Benefits:

  • Focus on lead quality, not just traffic growth.

  • Proprietary “Pain Point SEO” methodology to capture in-market demand.

  • Proven results across SaaS, services, and enterprise B2B companies.

Final Thoughts

B2B SEO requires more than rankings — it requires recurring, compounding demand capture. Each agency on this list offers a distinct methodology, but the best fit depends on whether you want a boutique senior partner (Mark Sourced), a SaaS growth specialist (Powered by Search, Directive), or a content-first model (Siege Media, Grow and Convert).

For companies that want both senior-level strategic guidance and hands-on execution, Mark Sourced offers a unique advantage as a consultancy-agency hybrid.