Hiring an enterprise SEO agency is a different decision from hiring a search partner for a small business, because the problems start at a scale where ordinary playbooks stop working. A retailer with four million product URLs, a publisher with two decades of archived articles, or a software company running forty country subfolders does not struggle with title tags. It struggles with crawl budget being spent on faceted navigation, with hreflang clusters that point at redirected pages, with JavaScript templates that render differently for Googlebot than for users, and with a release calendar that ships changes nobody in marketing reviewed.
The economics are also different. When a single template controls hundreds of thousands of pages, one fix can move more revenue than a year of blog posts, and one bad deploy can wipe it out overnight. That is why the best enterprise SEO services look less like content production and more like product management: prioritized tickets written for engineering teams, forecasts that finance will sign off on, QA checklists for staging environments, and governance rules that keep regional teams from cannibalizing each other. Migrations deserve special mention. Replatforming a large site is the single riskiest event in its organic life, and the firms worth hiring have mapped redirects at the scale of millions of URLs before.
Then there is reporting. Enterprise SEO lives inside organizations with procurement departments, quarterly business reviews, and executives who want to know why organic traffic dipped when a core update landed. A capable partner translates crawl logs and ranking data into language a CMO and a VP of Engineering can both act on. In 2026 that also means reporting on visibility inside Google’s AI Overviews, AI Mode, ChatGPT, Perplexity and Gemini, where brand citations increasingly shape which vendors buyers shortlist. If you are still defining the criteria, our breakdown of what defines the best enterprise SEO agency in today’s market is a useful companion to this list.
The firms below were selected for verifiable enterprise work shown on their own websites: named large-brand clients, technical depth on big sites, migration experience, international capability, and a credible approach to AI search. The ranking reflects track record and specialism rather than size alone, so established global networks sit alongside technical boutiques that do one thing extremely well.
Enterprise SEO Agencies At A Glance
Company
Headquarters
Best For
Standout Trait
Seer Interactive
Philadelphia, PA
Data-led SEO and GEO for large US brands
130+ enterprise clients with a 92% retention rate
Brainlabs
London, UK
Global brands needing SEO across many markets
110+ SEO specialists and proprietary tooling
97th Floor
Lehi, UT
Enterprise tech and B2B brands with complex portfolios
Client roster including Oracle, Salesforce and AT&T
Previsible
San Francisco, CA
In-house enterprise SEO teams that want senior operators
Founders from eBay, Searchmetrics and Semrush
Semetrical
London, UK
International and data-heavy SEO programs
Custom crawl and indexing tools, clients in 19 markets
Amsive
Bolingbrook, IL
Publishers, ecommerce and multi-location brands
Award-winning SEO team with AEO practice
Big Leap
Lehi, UT
Enterprise brands wanting SEO plus site migrations
95.3% client retention over 17+ years
Momentic
Milwaukee, WI
Replatforming and technical SEO for large sites
Millions of URLs replatformed
Blue Array
Reading, UK
UK enterprise brands going international
B Corp certified organic search consultancy
Go Fish Digital
Raleigh, NC
Ecommerce and consumer brands chasing AI citations
Seer Interactive was founded in 2002 by Wil Reynolds, who started it as a one-person operation out of his living room. More than two decades later it has grown to 250+ full-time team members, contractors, part-timers and interns. The company operates remote-first with two offices, and its mailing address is in Philadelphia. Its services span SEO, paid media, analytics, creative, conversion rate optimization and generative engine optimization.
What makes Seer relevant to enterprise buyers is its client base and its retention. The firm reports more than 130 enterprise clients and a 92% retention rate, and the logos on its site include American Family Insurance, Intuit, TIME and Drexel University. Seer has built its reputation on connecting search data with analytics, which matters when stakeholders want to see organic performance tied to revenue rather than to rankings alone.
Seer has also invested early in AI search. It offers GEO strategy, AI Overviews optimization, AI-assisted content programs and a separate AI consulting line called SeerAdvance. For a large organization trying to understand how its brand shows up in answer engines, that combination of research culture and measurement discipline is useful.
Seer fits enterprise marketing teams that want a partner comfortable with data warehouses, attribution questions and cross-channel planning, and that value a long-running agency with a stable team over a newer shop.
2. Brainlabs — Global Agency With 110+ SEO Specialists And Proprietary Search Tools
Brainlabs was founded in 2012 by Dan Gilbert, who left Google to start the agency. It now employs more than 1,000 people across five continents, works with 250+ client brands and manages more than $1.5 billion in media spend. Its EMEA office is in London, and it runs offices in New York, Dallas, Los Angeles, Toronto, Sydney, Singapore, Bengaluru, São Paulo and other cities. The company describes itself as management-owned and PE-backed.
Its SEO practice is large enough to stand on its own. Brainlabs states that more than 110 SEO specialists work on client programs, covering technical foundations such as crawlability and indexability, content for traditional search and AI surfaces, and off-site authority through digital PR. The team works with a set of in-house tools: Compass for mapping demand, NeuroGen for AI-assisted on-page optimization, Synapses for internal linking at scale, and AmplifAI for digital PR outreach.
Published results include a 7.5x increase in organic share of voice for B&Q and £400K in annual incremental revenue for Screwfix, both part of Kingfisher, plus a 186% lift in organic share of voice for Mars Petcare. The brands listed as partners include Netflix, Hilton, AT&T, Microsoft, Klaviyo and Polaroid.
Brainlabs is best suited to multinational brands that need one partner coordinating SEO across regions and want search planned alongside paid media rather than in a silo.
3. 97th Floor — Utah Agency Running SEO And GEO For Oracle, Salesforce And AT&T
97th Floor was founded in 2005 by Chris Bennett and is based in Lehi, Utah, with a team of about 80 people. Its enterprise credentials go back a long way: the firm’s own history mentions work for Adobe, Wells Fargo and Lynda as early as 2009. Today its client list includes Oracle, Salesforce, AT&T, Schneider Electric, RingCentral, Check Point, LG, Gigamon and PennyMac.
The agency’s SEO work blends technical expertise, content strategy and relationship building aimed at both traditional search engines and AI search. It runs a dedicated GEO and AEO service that applies established SEO methods to generative platforms, and it has built its own marketing intelligence platform, Palomar, which supports research and reporting for client programs.
That mix suits enterprise technology companies in particular. Firms like Oracle and Schneider Electric run sprawling sites with product lines, documentation, regional pages and partner content that all compete for the same queries. An agency that has worked inside that kind of structure knows how to prioritize, how to write briefs that product marketing will accept, and how to present results to leadership that did not ask for SEO jargon.
97th Floor is a strong option for large tech and B2B brands that want a mid-size, senior team rather than a network agency, and that care about AI visibility as much as rankings.
4. Previsible — AI Discovery Agency Built By Former eBay And Searchmetrics Operators
Previsible describes itself as the AI discovery agency powering sustainable organic growth for enterprise teams. It lists offices in San Francisco and in Santiago, Chile, and its founders come from eBay, Searchmetrics, Semrush and Sports Authority, which gives the team direct experience running search for very large sites from the inside.
That in-house background shows in how the firm works. Previsible offers SEO strategy, GEO strategy, technical SEO, content marketing, authority building, site migration support and AI visibility optimization. Its clients include Etsy, Atlassian, Sage, Yelp, Coursera, Intercom and KQED, a list heavy on marketplaces and platforms where page counts run into the millions and the SEO challenge is largely about templates, internal linking and indexation control.
A testimonial on the site from Atlassian says the team is willing to dig in, explain the reasoning behind recommendations and help make the changes, rather than only handing over advice. That is the quality most in-house enterprise SEO leads want from an outside partner: someone who can write a ticket engineering will accept and then stay involved until it ships.
Previsible fits companies that already have an in-house SEO function and want senior external operators to extend it, particularly marketplaces, UGC platforms and large SaaS properties.
5. Semetrical — London Data Consultancy Running SEO For Clients In 19 Markets
Semetrical was founded in 2013 and is based on City Road in London. It positions itself as an AI-native agency combining search engine optimization, generative engine optimization, analytics implementation and data science. Its portfolio includes global multinationals, with clients across 19 markets.
The named client list is notably enterprise-heavy: LexisNexis, Ticketmaster, Stripe, Cloudflare, Vogue, Sotheby’s, Activision Blizzard Media, the Independent and The Spectator all appear on its site. Several of those are publishers or marketplaces with enormous URL counts, where the technical questions are about indexing, duplicate content and crawl allocation rather than keyword research.
Semetrical has built its own tooling for this. It uses custom tools, named Ogorki5 and Dexter, for technical audits and indexing analysis, which lets the team examine large sites in ways off-the-shelf crawlers struggle with. Alongside SEO it offers predictive analytics and AI consultancy, including custom agents and LLM integration work.
Semetrical suits international brands and large publishers that want their SEO partner to be as comfortable with data pipelines as with search strategy, and that operate across many country markets at once.
6. Amsive — Award-Winning SEO And AEO Team For Publishers And Ecommerce
Amsive is a data-led growth agency headquartered in Bolingbrook, Illinois, near Chicago, with offices in New York, Nashville, Greenville and other locations. Its SEO group is one of the better-known teams in the industry, with multiple Best Overall SEO Initiative honors from Search Engine Land, a Best Use of Search award from the U.S. Search Awards, and a Best in Class Agency designation from Conductor.
The service menu is built around the problems large sites actually have. Technical SEO covers site architecture, Core Web Vitals, structured data, internationalization and JavaScript rendering. There are dedicated practices for ecommerce SEO, publisher and news SEO, Google Discover, local SEO and algorithm update recovery. The team works with the enterprise tooling most large in-house teams already license, including Botify, Conductor, BrightEdge, STAT and Screaming Frog.
Amsive has also formalized its answer engine optimization work, positioning SEO and AEO together to cover AI Overviews, LLMs and platforms such as ChatGPT and Perplexity. One published case shows a 74.5% jump in organic traffic value for a publisher client, and client work on the site includes Commerce Bank and the University of Tennessee.
Amsive fits news publishers, media groups and large ecommerce catalogs that are exposed to core updates and Discover volatility and want a team that has handled recovery work before.
7. Big Leap — Lehi SEO Firm With Site Migration Practice And 95.3% Retention
Big Leap is headquartered in Lehi, Utah, and has been operating for more than 17 years. The firm reports a 95.3% client retention rate over that period, a useful signal in a category where enterprise contracts often turn over after a single reorganization or a new CMO.
Its services include technical SEO, local SEO, AI SEO, digital PR and link building, and site migrations, which it offers as a dedicated service rather than an add-on. The AI SEO line focuses on visibility in AI Overviews and in tools such as ChatGPT and Perplexity. Big Leap explicitly serves enterprise clients, and the brands on its site include Avis, Workfront, Pluralsight, Venafi, Extra Space Storage, Visionworks, AlphaGraphics and Purple.
That roster covers two enterprise patterns worth noting. Avis, Extra Space Storage and Visionworks run large location footprints where store and branch pages need to be managed at scale, while Workfront, Pluralsight and Venafi are software brands with deep product and resource libraries. A firm that has worked in both environments can usually adapt its playbook to a hybrid business.
Big Leap suits enterprises planning a redesign or replatform that want the SEO partner who will run the migration to also own the ongoing program afterward.
8. Momentic — Milwaukee Technical SEO Consultancy Behind Millions Of Replatformed URLs
Momentic is a Milwaukee-based SEO and digital strategy consultancy that has operated since 2018, led by President and CEO Tony Van Hart. The firm says hundreds of enterprise and mid-market brands have trusted it, and its client logos include GE Healthcare, JetBlue, Regal Rexnord, Navien, Stella & Chewy’s, CollegeVine, Rula and Sheet Music Plus.
Momentic’s clearest differentiator is migrations. The company states that it has successfully replatformed millions of URLs through technical SEO work, and it lists migrations and redesigns, information architecture, technical SEO and audits among its core services. For an enterprise planning a move to a new CMS or commerce platform, that experience with redirect mapping, template parity and post-launch monitoring is exactly what reduces risk.
The firm has also added AEO and GEO services covering ChatGPT, Gemini, Copilot, Claude and Perplexity, with the stated goal of getting brands found and recommended whether customers search Google or ask an AI assistant.
Momentic is a good fit for manufacturers, healthcare brands and ecommerce companies facing a replatform, and for teams that want a focused consultancy rather than a full-service agency.
9. Blue Array — B Corp Certified Organic Search Consultancy For UK Enterprise Brands
Blue Array is headquartered in Reading, UK, with offices in London and Seville, Spain. It describes itself as a market-leading organic search agency and uses the term SEO consulgency to describe a model that combines senior consulting insight with agency delivery. The firm says it has been a UK agency of choice for more than a decade, and it is B Corp certified.
Its client list is dominated by large UK consumer and financial brands: Zoopla, Future, Pret, Boden, RAC, Yell, the Post Office, Simply Business, GoCardless, Pepper Money and Ben Sherman. Future, a major publishing group, and Zoopla, a property portal with vast listing inventories, are both classic large-site SEO problems.
Services are organized into organic search, brand and discovery pillars, covering technical SEO, enterprise and international SEO, generative engine optimization, digital PR, content, CRO, audits and training. The training element matters for enterprise buyers, since the long-term health of a big site depends on developers and content teams knowing the rules as much as on the agency.
Blue Array suits UK-headquartered enterprises and international brands entering the UK that want a dedicated organic search specialist with a consulting mindset.
10. Go Fish Digital — Raleigh Search Agency Pairing Technical SEO With GEO For Consumer Brands
Go Fish Digital is headquartered in Raleigh, North Carolina, with offices in Boston, Washington DC, Phoenix, San Diego and Jacksonville. It cites 20 years in search and is part of Agital, a platform that combines several agencies including Exclusive Concepts and Highnoon. Co-founder Dan Hinckley serves as Chief Product and AI Officer.
The firm’s SEO work is built on technical foundations, search-focused content and ongoing optimization, and it has leaned heavily into generative engine optimization, aiming to get clients ranked in Google and cited in ChatGPT, AI Overviews, Claude and Perplexity. It has developed proprietary tools, including one called Barracuda, and offers structured audit products.
Clients on its site include Chicco USA, Joybird, Apt2B, SimpleTexting and MoneyGeek, with one published case showing a 74.8% increase in clicks and a 50.6% increase in impressions for MoneyGeek. The agency has been recognized at the U.S. Search Awards and The Drum Search Awards and has appeared on the Inc. 5000.
Go Fish Digital fits consumer and ecommerce brands at the upper mid-market and enterprise level that want AI citation work integrated with core technical SEO, and that value an agency with access to a wider network of specialist sister firms.
How To Choose An Enterprise SEO Agency
Have They Worked On A Site Of Your Size And Architecture?
Scale changes the work. Ask for examples of sites with a comparable number of indexable URLs and a similar architecture, whether that is faceted ecommerce, a publisher archive, a marketplace with user-generated listings or a multi-country SaaS site. Ask how they approach crawl budget and log file analysis, how they handle parameter and pagination rules, and which crawling platforms they use for sites in the millions of pages. A firm that answers with specific numbers and tools is usually speaking from experience.
How Do They Get Recommendations Into The Development Queue?
Most enterprise SEO programs fail at implementation, not diagnosis. Ask to see a sample ticket written for an engineering team, including acceptance criteria and QA steps. Find out whether the agency will join sprint planning, test changes on staging and monitor releases after launch. The strongest partners also help you build governance: documented rules for templates, redirects and new sections so that regional or product teams do not undo the work six months later.
What Is Their Migration And International Track Record?
If a replatform, domain consolidation or redesign is anywhere on your roadmap, ask how many large migrations the team has led and what traffic looked like 90 days after launch. For international sites, ask how they audit hreflang at scale, how they decide between subfolders, subdomains and country domains, and how they coordinate with local marketing teams. These are areas where enterprise SEO services vary the most between firms that claim the same capability.
How Will They Measure And Report AI Search Visibility?
Organic performance in 2026 is no longer only about blue links. Ask which AI surfaces the agency tracks, how it measures brand citations and share of voice in AI Overviews, ChatGPT, Perplexity and Gemini, and how that reporting ties back to pipeline or revenue. If AI visibility is a priority, our list of the top AI SEO agencies in 2026 covers firms that specialize in that area.
How Is The Engagement Priced And Staffed?
Enterprise engagements are usually retainers, sometimes paired with fixed-fee projects for audits or migrations. Ask who will actually work on the account, how senior they are, and how many other clients they carry. Clarify what happens when priorities shift mid-quarter, and whether reporting is built for executives or only for the SEO team. For a deeper look at the trade-offs, see our guide to SEO pricing models: retainer vs hourly vs project.
Conclusion
The right enterprise SEO company depends on where your risk sits. Global brands coordinating many markets will lean toward firms like Brainlabs, Seer Interactive or Semetrical. Companies facing a replatform should look hard at migration specialists such as Momentic or Big Leap, and large tech and platform businesses may prefer the operator-led models of 97th Floor and Previsible. Whatever the shortlist, test each candidate on implementation, migrations and AI visibility, since those are the areas where large sites win or lose the most. Teams buying search alongside broader demand generation may also want to review our list of the top B2B marketing agencies in 2026.
We update our Top Enterprise SEO Agencies In 2026 list as firms grow, specialize or change focus. If your agency does verifiable enterprise search work and you would like to be considered for future editions, you can submit your company for review.
