Top Enterprise SEO Agencies for Large & Complex Websites

An enterprise SEO agency helps large companies get found on Google and in AI tools like ChatGPT, Gemini, and Perplexity. Large companies often have websites with thousands of pages and many teams working on them, so SEO here needs more planning and more coordination than it does for a small site.

Search is still a major source of website visitors. A BrightEdge study of thousands of websites found that organic search brought in 53% of all trackable traffic. That is why large brands invest in it.

Search is also changing. More people now get answers directly from AI tools and AI summaries in search results, so appearing in those answers matters alongside ranking in the normal results.

This guide lists ten enterprise SEO agencies. For each one, you will see what it does best, which services it offers, which clients it works with, and what kind of business it suits. After the list, we explain how to choose the right enterprise SEO agency and what to ask about pricing.

What is an enterprise SEO agency?

An enterprise SEO agency is a company that helps large websites get more visitors from search. It fixes technical problems across thousands of pages, keeps content consistent, works with many teams, and reports results in leads and sales, including how often your brand appears in AI answers.

Enterprise SEO vs. Regular SEO

Explore the key differences between Enterprise SEO and Regular SEO to understand which approach best fits your website and business goals.

Top Enterprise SEO Agencies

These top enterprise SEO agencies are listed by their experience with large websites, team strength, and AI search capabilities, so you can quickly compare and shortlist.

1. EZ Rankings (Noida, Delhi NCR)

EZ Rankings started in 2010 and says it has served 16,000+ clients in 28+ countries. It is listed on Forbes India, and it runs a dedicated enterprise SEO service for very large sites. That service covers crawl budget fixes, log-file analysis, JavaScript rendering, faceted navigation control, and hreflang setup for sites that sell in many countries. It also tracks how often a brand is cited in ChatGPT, Gemini, Perplexity, and Google AI Overviews, and it reports weekly on this.

It offers three enterprise plans (Foundation, Growth, and Enterprise+). The top plan includes a dedicated team, multi-domain governance, and support for your developers. Reporting uses live dashboards that connect organic search to leads and revenue. It also runs a white-label program, so it often works behind other agencies. It is a good fit for large ecommerce, SaaS, B2B, education, healthcare, and multi-country brands. Before you sign, ask for named enterprise case studies, because the examples on its enterprise page are labelled as illustrative and are shared on request.

Key Details:

• Head Office: Noida, Uttar Pradesh (Delhi NCR), with a satellite office in Philadelphia, USA
• Services: Enterprise SEO, Technical SEO, International SEO, GEO and AI Search Optimization, AEO, Paid, White-Label SEO
• Industries: Ecommerce, SaaS, B2B, Education, Healthcare, Finance, Legal
• Client Reach: 28+ countries, with offices in India and the USA
• Specialty: Enterprise SEO at Scale, International SEO, AI Search Visibility, White-Label Delivery

2 – HigherVisibility (Memphis, USA)

HigherVisibility is a full-service digital marketing agency that has been working since 2009. Its main strength is SEO, and it runs paid search, paid social, conversion optimization, and web design alongside it. Its SEO work covers franchise and multi-location SEO, ecommerce SEO, link building, audits, and a GEO service that helps brands get mentioned in AI answers. Search Engine Land named it SEO Agency of the Year in 2017 and 2020, and the US Agency Awards gave it the same title in 2025.

It is a good fit for large brands, franchises, and multi-location businesses that want one team to manage several channels. It also serves smaller businesses and does not promote a separate enterprise SEO service, so ask for references from very large sites before you sign.

Key Details:

• Head Office: Memphis, Tennessee, USA
• Services: SEO, Franchise and Multi-Location SEO, Ecommerce SEO, GEO and AI SEO, Link Building, SEO Audits, Paid Search, Paid Social, CRO, Web Design
• Industries: Franchise, Automotive, Finance, Ecommerce, Home Services, Legal
• Client Reach: USA
• Specialty: SEO for Franchise and Multi-Location Brands, Ecommerce SEO, AI Search (GEO), Paid Media Alongside SEO

3 – Victorious (San Francisco, USA)

Victorious is an agency that does only SEO and has worked on enterprise and technical SEO since 2013. It describes itself as a 5x SEO Agency of the Year, and its site lists awards from Search Engine Land and Clutch. Its work covers technical SEO, site migrations, audits, content, and link building. It also has a dedicated AEO service that aims to get brands cited in ChatGPT, Gemini, Perplexity, Copilot, Claude, and Google AI Overviews. Its enterprise page says it scales strategy across thousands of pages and many teams, with clear reporting tied to business goals.

It is a good fit for mid-market and large brands, especially in SaaS, finance, healthcare, ecommerce, and education, that want a specialist team and don’t need paid ads handled too. Because it focuses only on SEO, you would need another partner for paid media, and it asks for a sizeable ongoing budget, so check that the scope matches yours.

Key Details:

• Head Office: San Francisco, California, USA (fully remote team across the US)
• Services: Enterprise SEO, Technical SEO, SEO Migration, SEO Audits, AEO and GEO, Content, Link Building, Multi-Location SEO
• Industries: SaaS, Finance, Healthcare, Ecommerce, Higher Education, Insurance, Law
• Client Reach: USA and international
• Specialty: SEO-Only Enterprise Agency, Technical SEO and Site Migrations, Answer Engine Optimization (AEO)

4 – iPullRank (New York, USA)

iPullRank is a New York-based agency, led by founder and CEO Mike King, that focuses on enterprise SEO and AI search. Search Engine Land named Mike King its AI Search Marketer of the Year for 2025, and the agency says it has delivered more than $5 billion in organic search results for clients. Its main idea is “Relevance Engineering,” a method that treats SEO as a technical discipline, using how search and AI systems understand meaning to decide what content to create and fix. Its services cover technical SEO, content engineering, content marketing, GEO (getting cited in AI answers), and a structured AI Search Strategy Program built for large brands.

It is a good fit for large and high-growth companies in finance, ecommerce, and technology that want a research-heavy, technical partner to prepare for AI search. Its approach is more advanced than a standard SEO package, so confirm that your budget and in-house team can support it.

Key Details:

• Head Office: New York, USA (remote team)
• Services: Technical SEO, Relevance Engineering, GEO and AEO, Content Engineering, Content Marketing, AI Search Strategy, Generative AI
• Industries: Finance, Ecommerce, Technology
• Client Reach: Fortune 500 and high-growth brands
• Specialty: Technical SEO, Relevance Engineering, AI Search Strategy for Large Brands

5 – Seer Interactive (Philadelphia, USA)

Seer Interactive is a data-first digital marketing agency that Wil Reynolds started in 2002. It has grown to more than 200 people across Philadelphia, San Diego, and remote teams. SEO is its core service, and it has built a GEO practice that runs live tests to see what gets brands mentioned in ChatGPT and other AI tools. It also offers paid media, analytics, conversion optimization, and creative and UX work, so SEO can be planned together with the rest of a brand’s marketing.

It is a good fit for large brands that want testing and measurement behind every decision, especially in finance, SaaS, healthcare, education, and ecommerce. It serves companies of different sizes, so ask for examples at your scale, and expect a premium price.

Key Details:

• Head Office: Philadelphia, Pennsylvania, USA (second office in San Diego, plus remote staff)
• Services: SEO, GEO, Paid Media, Analytics, CRO, Creative and UX
• Industries: Finance, SaaS, Healthcare, Education, Ecommerce
• Client Reach: Enterprise brands across the USA
• Specialty: Data-Led SEO, GEO Testing, Analytics for Large Brands

6 – Siege Media (San Diego, USA)

Siege Media is an organic growth agency founded by Ross Hudgens in 2012. It has made the Inc. 5000 list six years in a row. It leads with content, using SEO, GEO, digital PR, and design to earn rankings, links, and AI citations. It works fully remotely and serves mid-sized and large brands in SaaS, fintech, and ecommerce.

It is a good fit for brands that win by publishing useful, well-designed content at scale. It is less suited to sites whose main problem is deep technical SEO, and some client reviews on Clutch ask for more technical depth in specialized industries.

Key Details:

• Head Office: San Diego, California, USA (remote team)
• Services: SEO, GEO, Content Marketing, Digital PR, Graphic Design
• Industries: SaaS, Fintech, Ecommerce
• Client Reach: USA
• Specialty: Content-Led SEO, Digital PR, AI Search Visibility

7 – iProspect (Global, part of dentsu)

iProspect is a global media and performance marketing agency that belongs to the dentsu group. It works across 93 markets with a network of more than 8,000 media and performance specialists. SEO sits next to paid search, programmatic advertising, social, commerce media, and analytics, so one team can plan search and media spending together.

It is a good fit for very large global brands in retail, finance, technology, automotive, and consumer goods that want SEO inside a bigger media program. SEO is one service among many here, so ask who will actually staff your SEO work and how much senior time it gets.

Key Details:

• Head Office: Global network (part of dentsu)
• Services: SEO, Paid Search, Programmatic, Social Media, Commerce Media, Content, Analytics
• Industries: Retail, Finance, Technology, Automotive, Consumer Goods
• Client Reach: Global, 93 markets
• Specialty: Global SEO Within Integrated Media Programs

8 – WebFX (Harrisburg, USA)

WebFX is a full-service digital marketing agency that has been working since 1996, with a team of 500+ digital experts. It runs SEO, paid ads, content, and web development in-house, using marketing technology it built itself. Clutch tags it as working with enterprise clients (over $1 billion in revenue), alongside many small and mid-sized businesses.

It is a good fit for mid-sized and large companies that want one agency for several digital channels and clear reporting. Because it serves so many smaller clients, ask for references from very large sites and find out who will lead your account.

Key Details:

• Head Office: Harrisburg, Pennsylvania, USA (second office in Dallas)
• Services: SEO, PPC, Content Marketing, Web Design and Development, Ecommerce Marketing
• Industries: Ecommerce, B2B, Healthcare, Manufacturing, Services
• Client Reach: USA and global brands
• Specialty: Full-Service SEO and Paid Media With In-House Tech

9 – Growth Hackers Digital (Bengaluru)

Growth Hackers Digital was founded in 2017 and describes itself as a performance marketing and AI-led creative agency. It works with funded startups and multinational companies, and SEO sits next to paid ads, lead generation, content, and conversion work. On its Semrush Agency Partners profile it lists clients such as Paytm, Godrej, and Decathlon.

It is a good fit for scaling brands that want organic and paid channels managed by one team, with a focus on cost per lead and return on ad spend. SEO is one part of a performance-first service, not a dedicated enterprise SEO practice, so ask for results on very large sites.

Key Details:

• Head Office: Bengaluru, Karnataka
• Services: SEO, Performance Marketing, Content Marketing, Lead Generation, Creative
• Industries: Startups, Ecommerce, Consumer Brands, MNCs
• Client Reach: Funded startups and multinational companies
• Specialty: Performance Marketing With SEO for Scaling Brands

10 – SEO India Online (Lucknow)

SEO India Online is an AI-focused SEO agency with 50+ specialists, offices in Lucknow and Atlanta, and clients in the US, UK, Canada, Australia, the UAE, and other markets. It offers SEO, GEO and AI visibility work, local and ecommerce SEO, and white-label delivery for other agencies. Its plans run month to month with no lock-in.

It is strongest where a larger brand needs a focused workstream, such as AI visibility, schema, or a set of key sections, not a team embedded across a million-page site. Its homepage shows mostly small and mid-sized clients, so it is not the right choice for a very large, multi-team program.

Key Details:

• Head Office: Lucknow, Uttar Pradesh (US office: Atlanta, Georgia)
• Services: SEO, GEO and AI Search Visibility, AEO, Local SEO, Ecommerce SEO, White-Label SEO
• Industries: Healthcare, Real Estate, Legal, Education, Ecommerce, SaaS, B2B
• Client Reach: USA, UK, Canada, Australia, UAE, and other markets
• Specialty: AI Search Visibility and Schema Workstreams, White-Label Delivery

How to Choose the Right Enterprise SEO Agency

Choosing an enterprise SEO agency is an important decision because large websites often have thousands of pages, multiple teams, different markets, and complex technical requirements. The right agency should understand these challenges and create an SEO strategy that supports your wider business goals.

Instead of choosing an agency based only on its reputation, pricing, or ranking promises, evaluate its experience, processes, team, technology, communication, and ability to deliver measurable business results.

1. Understand Your SEO Requirements First

Before approaching an agency, identify the areas where your website needs the most support. Your priorities may include:

• Technical SEO: Improving website architecture, crawlability, indexing, site speed, JavaScript SEO, or handling large-scale migrations.
• Content Growth: Creating and optimizing content across hundreds or thousands of pages while maintaining quality and consistency.
• International SEO: Managing multiple countries, languages, regional websites, and location-based search strategies.
• Ecommerce SEO: Improving product, category, and collection pages to increase qualified organic traffic and sales.
• AI Search Visibility: Optimizing content and website information for AI-powered search experiences, including Google AI Overviews, ChatGPT, Gemini, Perplexity, and other answer engines.
• Organic Lead Generation: Connecting SEO performance with qualified leads, conversions, sales, and revenue.

Having clear priorities will help you find an agency with the right expertise instead of choosing a general provider that may not match your needs.

2. Look for Proven Enterprise SEO Experience

Enterprise SEO is different from SEO for a small or medium-sized website. A large website may have complex navigation, thousands of URLs, multiple templates, several stakeholders, and frequent technical changes.

Ask the agency about its experience with websites of a similar size and complexity.

Look for:

• Experience managing large websites
• Enterprise technical SEO knowledge
• Experience with international or multi-location websites
• Ecommerce or B2B SEO expertise, depending on your business
• Experience with migrations and major website changes
• Case studies with measurable outcomes
• Experience working with internal marketing and development teams

An agency should be able to explain not only what it achieved, but also how it achieved those results.

3. Check the Team That Will Manage Your SEO

The people handling your campaign can have a major impact on its success.

During the initial discussions, ask who will actually work on your account. Find out about the roles of the SEO strategist, technical SEO specialists, content team, analysts, and account manager.

It is also useful to understand:

• Who will create the strategy?
• Who will perform technical audits?
• Who will review content?
• Who will communicate with your internal teams?
• How often will senior SEO specialists review the campaign?

A strong agency should provide clear ownership and avoid making the entire process dependent on one account manager.

4. Evaluate Its Technical SEO Capabilities

Technical SEO becomes increasingly important as a website grows.

Ask how the agency approaches issues such as:

• Website architecture
• Crawl and index management
• Canonicalization
• Internal linking
• JavaScript rendering
• Core Web Vitals
• Structured data
• XML sitemaps
• txt
• Duplicate and thin content
• Faceted navigation
• International hreflang implementation
• Website migrations

More importantly, ask how technical recommendations are turned into actual website improvements.

If your developers manage implementation, the SEO agency should provide clear documentation and work closely with the development team. If the agency also supports implementation, understand exactly what is included.

5. Ask for a Clear SEO Roadmap

A good enterprise SEO agency should be able to explain what it plans to accomplish and why.

Ask for an initial roadmap that covers areas such as:

First 30 days:
Website analysis, business understanding, technical review, competitor research, keyword research, and performance benchmarking.

Next 30 days:
Priority technical improvements, content opportunities, internal linking recommendations, and optimization of important landing pages.

Following 30 days:
Content expansion, authority building, AI search optimization, performance analysis, and refinement of the SEO strategy.

The exact timeline will vary by website, but the agency should be able to explain its priorities and expected deliverables clearly.

6. Understand How the Agency Measures Success

Keyword rankings are useful, but they should not be the only measure of an enterprise SEO campaign.

Your reporting should connect SEO activity with meaningful business outcomes, such as:

• Organic traffic
• Qualified organic leads
• Sales and revenue
• Conversion rate
• Non-brand search growth
• Important landing page performance
• New customer acquisition
• Product or service enquiries
• Organic visibility across target markets
• AI search visibility

Ask the agency how it will connect SEO data with your existing analytics, CRM, ecommerce platform, or other business systems.

7. Review Its Content and Authority Strategy

Enterprise websites need more than a high volume of content. The agency should have a clear approach to creating useful, trustworthy, and relevant content.

Ask how it handles:

• Topic and keyword research
• Search intent
• Content gaps
• Existing content optimization
• Expert input
• Author credibility
• Internal linking
• Digital PR and authority building
• Content distribution
• Content performance analysis

The focus should be on building topical authority and helping users, rather than publishing large amounts of content simply to increase page count.

8. Check Its Approach to AI Search

Search behaviour is changing as users increasingly interact with AI-powered platforms.

If AI visibility is important to your business, ask whether the agency has a strategy for platforms such as Google AI Overviews, ChatGPT, Gemini, Perplexity, and Bing Copilot.

The agency should understand areas such as:

• Entity and brand visibility
• Helpful and authoritative content
• Structured data
• Question-based content
• Citations and trusted sources
• Content designed for answer engines
• AI search visibility measurement

AI SEO should complement your traditional SEO strategy rather than operate as a completely separate activity.

9. Consider Communication and Reporting

Enterprise SEO involves multiple stakeholders, so communication needs to be structured.

Before signing a contract, understand:

• How often meetings will take place
• Who will be your main contact
• How recommendations will be shared
• How urgent technical issues are handled
• What reporting platform is used
• How performance updates are presented
• How strategy changes are communicated

Choose an agency that can explain complex SEO issues in simple business terms and work comfortably with marketing, development, content, product, and leadership teams.

10. Do Not Choose an Agency Based Only on Price

Enterprise SEO requires significant resources, specialist expertise, technology, and ongoing analysis. The cheapest agency may not always provide the level of support your website requires.

Instead of comparing agencies only by monthly fees, compare:

• Scope of work
• Team expertise
• Level of strategic involvement
• Technical capabilities
• Content resources
• Reporting and analytics
• Communication
• Expected business outcomes
• Flexibility as your requirements change

The right agency should provide a clear connection between the investment and the work required to achieve your business objectives.

Grow Your Enterprise Search Visibility with SEO India Online

Take your enterprise SEO beyond rankings with a strategy covering technical SEO, quality content, international visibility, and AI search. As an AI SEO Company in India, SEO India Online helps businesses improve organic visibility, reach qualified audiences, and identify new growth opportunities.

Ready to grow? Contact SEO India Online for a customized enterprise SEO strategy.