London has one of the deepest B2B marketing agency markets in Europe. The city is home to the UK headquarters of global technology vendors, professional services firms and financial institutions, and the agencies that serve them range from network-owned groups with hundreds of staff to small specialist teams built around one channel, such as LinkedIn advertising or HubSpot.
That range makes shortlisting harder than it looks. Many agencies call themselves B2B, but the ones that do it well tend to share a few traits: they understand long sales cycles and buying committees, they can connect brand work to pipeline, and they can show case studies with named clients rather than vague claims.
To build this list, we checked each firm against its own website for three things: a London office or address, B2B marketing as a core offer rather than a side service, and verifiable work for named clients. No company paid to be included, and the order reflects our judgement of strength and fit. You can find more London guides and lists on our London services hub.
London B2B Marketing Agencies At A Glance
Agency
London Base
Best For
Core Services
Transmission
Shad Thames, SE1
Global tech brands needing integrated go-to-market
B2B tech firms wanting sharp positioning and content
Strategy, creative, performance marketing
Ledger Bennett
King’s Cross, N1C
Enterprise demand generation and flexible talent
Demand generation, ABM, content, talent services
Gravity Global
Shoreditch, EC2A
Aerospace, manufacturing and complex B2B sectors
Brand strategy, go-to-market, media, PR, content
Man Bites Dog
London Bridge, SE1
Professional services and thought leadership
Thought leadership, brand positioning, ABM, content
Rooster Punk
Holborn, WC1R
B2B tech and finance brands that need a sharper story
Brand strategy, storytelling, creative campaigns
Gripped
Borough, SE1
SaaS and AI start-ups and scale-ups
Demand generation, ABM, paid social, SEO, GEO
Babel
Fitzrovia, W1W
B2B tech brands wanting PR-led growth
Tech PR, thought leadership, integrated campaigns
Fifty Five and Five
Bermondsey, SE1
Tech vendors and Microsoft partners
Content, campaigns, demand generation
Best B2B Marketing Agency Options In London
1. Transmission — Global Independent B2B Agency With Integrated Go-To-Market Teams
Transmission describes itself as a global B2B marketing agency combining human expertise and AI to deliver complete go-to-market programmes. Its London office is at The Clove Building, 4 Maguire Street, SE1, near Tower Bridge, and the agency also lists offices in San Francisco, New York, Dallas, Sydney, Singapore, Delhi and Wroclaw. It states that it has more than 250 employees and positions itself as the largest independent B2B agency of its kind.
Services run from growth consulting and brand positioning through to audience strategy, account-based marketing, paid advertising, content, digital experiences and demand generation. Work featured on its site includes campaigns for Windows 11 Pro, Snapdragon X Elite and AutoStore.
Its recent awards listed on the site include Gold for Best B2B Campaign at the REGGIES Catalyst 2026 and Gold wins at The Drum Awards in 2024 and 2025. Transmission suits technology companies that want a single agency to run strategy, creative and media across several regions.
2. tmp — Brand To Demand And Partner Marketing For Enterprise Tech
tmp, formerly known as The Marketing Practice, is a global B2B marketing agency with its London office at 30-31 Cowcross Street, Farringdon, EC1M. It also lists offices in Munich, Denver and Sydney.
The agency is strongly associated with enterprise technology and partner ecosystems. Clients named on its site include AWS, Palo Alto Networks, ServiceNow, Splunk, Commvault, Verizon, Capgemini and Thomson Reuters, with case studies covering Nutanix, Forcepoint, Virgin Media O2 Business and Boeing Global Services. Its service list covers brand to demand, partner marketing, ABM, paid media, creative, data and analytics, digital experience, sales activation and AI consulting.
tmp also runs tmp.academy for training and reports that B2B Marketing ranked it among the top agencies for brand and demand generation. It is a strong option for vendors that sell through or alongside large technology partners and need joint marketing that sales teams can actually use.
3. Velocity Partners — Content-Led B2B Tech Agency Now Part Of Pretzl
Velocity Partners is a B2B marketing agency for technology companies, based at 60 Great Portland Street, Fitzrovia, W1W, with a second office in New York. It organises its work into three areas: strategy, creative and performance. The agency is now part of Pretzl, a new marketing company formed by five Next 15 agencies.
Velocity is well known in B2B circles for its own content, including The Big Beautiful B2B Blueprint and The New B2B Manifesto. Clients shown on its site include Amazon, Salesforce, HubSpot, Workday, Demandbase, LiveRamp, Quantexa, Trustpilot and Russell Reynolds. Case studies cover a brand story, identity and website rebuild for Demandbase, repositioning for Calm Business and an integrated lead generation programme for Webhelp.
Velocity suits tech companies that need to clarify what they stand for before spending heavily on media, and that want a partner able to carry the story through into performance campaigns.
4. Ledger Bennett — Demand Generation Agency With A Fluid Talent Model
Ledger Bennett calls itself a global B2B marketing agency offering full-service, omni-channel demand generation and talent solutions. Its London address is Havas Village London, 3 Pancras Square, King’s Cross, N1C.
The agency works across the full customer lifecycle with what it describes as a 360-degree approach to building brands and sales. Clients named on its site include GE Digital, GE Vernova, John Crane, Global Business Travel, Canon, Acxiom and Trend Micro. A distinctive part of its offer is Fluid Talent, a service for filling skill gaps in in-house marketing teams quickly with sector-specific specialists.
Ledger Bennett is a good fit for large B2B organisations that want a demand generation partner and may also need extra hands inside their own team, for example during a launch or a restructure.
5. Gravity Global — Brand-To-Demand Agency For Complex Industrial And Tech Markets
Gravity Global is an independent marketing agency with a London office at 69 Wilson Street, EC2A, and further UK offices in Oxford, Norwich and Kent, plus locations in the US and Asia. It reports 14 offices, around 500 employees and more than 40 years in business.
Although Gravity works in consumer sectors too, a large share of its work is B2B, and it describes itself as a brand-to-demand marketing agency. Sectors it highlights include manufacturing, tech and SaaS, aerospace and B2B fintech. Clients named on its site include Airbus, Embraer and Honda Powersports, and its aerospace practice draws on more than two decades of category work.
Services include brand strategy, research, go-to-market planning, media, creative and content, public relations, digital experience, social media and AI. Gravity suits industrial, engineering and technology firms selling into complex, global markets that want one agency covering brand and pipeline.
6. Man Bites Dog — Thought Leadership Specialist For Professional Services Brands
Man Bites Dog is a B2B marketing consultancy with a London office at The Shard, 32 London Bridge Street, SE1, and a second base in Brighton. The business dates back to 2005 and focuses on what it calls Intelligent Brands for global B2B companies.
Its core strength is thought leadership. Clients named on its site include BCLP, Hogan Lovells, Korn Ferry, ACCA, BDO Global, BNY, Standard Chartered, Citrix, Arcadis and GHD. The agency lists a long run of awards, including Gold for Best Use of Thought Leadership at the 2019 B2B Marketing Awards for Korn Ferry and Best B2B Thought Leadership Campaign at The Drum Awards 2023 for GHD.
Services cover brand positioning, thought leadership, sales enablement and ABM, a content and design studio, a data and insights lab and marketing communications. The site lists ISO 9001, ISO 14001, Cyber Essentials and EcoVadis Platinum certifications. Man Bites Dog suits law firms, consultancies, banks and engineering firms that sell expertise and need research-led content.
7. Rooster Punk — Storytelling-Led B2B Brand Agency With Award-Winning Creative
Rooster Punk is a B2B brand and storytelling agency founded in 2013 by Paul Cash. Its contact page lists its London studio at 20 Red Lion Street, Holborn, WC1R, with further offices in Seattle and New York.
The agency builds brand narratives and campaigns for technology and financial services companies. Clients named on its site include Fujitsu, Capgemini, Okta, Colt and TeamViewer, and its case studies cover work for Allica Bank and Elavon. It says it has been named B2B Agency of the Year at The Drum Awards, it is a Gold winner at the B2B Marketing Awards, and it appears on the IPA Beacon List for 2026. Its founder also wrote the book Humanizing B2B.
Rooster Punk suits B2B brands that want to stand out with a clear story and bold creative, rather than buying a pure demand generation engine.
8. Gripped — Demand Generation Agency Built Only For SaaS And AI Companies
Gripped is a B2B digital marketing agency that works exclusively with SaaS and AI companies. It was founded in 2017 by former SaaS operators and lists its London office at 140-148 Borough High Street, SE1.
The agency says it has worked with more than 160 SaaS, AI and tech companies, including Ravelin, Ideagen, Epicor, Searchlight Cyber and Crownpeak. Its case studies report figures such as £1.3m in pipeline created in one quarter for Crownpeak and £2.1m in pipeline from demand generation for BlackDot.
Services cover go-to-market strategy, demand generation, account-based marketing, paid search, paid social including LinkedIn Ads, SEO, generative engine optimisation and website work. It works in 30-day sprints with real-time reporting and holds HubSpot and Google Partner status. Gripped suits start-up and mid-market software companies that want a specialist team measured on pipeline.
Babel is a B2B technology PR and marketing agency with more than twenty years of experience. Its office is at Bolsover House, 5-6 Clipstone Street, Fitzrovia, W1W.
It runs PR and integrated campaigns for technology brands through a global partner network. Clients named on its site include Vodafone Business, Openreach, Amdocs, Ciena and Glean, and it publishes case studies for HPE and eDesk.
Babel suits B2B tech companies that want earned media and thought leadership to sit at the centre of their marketing.
Fifty Five and Five is a B2B marketing agency founded in 2014 by Chris Wright. Its contact page lists its office at The Leather Market, Weston Street, Bermondsey, SE1.
The agency works mainly with technology companies on content, campaigns and demand generation. Clients named on its site include Microsoft, SAP and TCS, and it publishes a case study for Algolia. It says it rebuilt its business around AI in 2021, and it won Bronze at The Drum Awards for B2B 2025 in the Campaigns Powered by AI category for its TCS London Marathon work.
Fifty Five and Five suits tech vendors and their partner teams that want an agency fluent in the Microsoft and enterprise software world, with AI built into how campaigns are produced.
How To Choose A B2B Marketing Agency In London
Do You Need A Generalist Or A Specialist?
Large integrated agencies such as Transmission and Gravity Global can run brand, content, media and events together, which reduces coordination work for your team. Specialists such as Gripped (SaaS), Man Bites Dog (thought leadership) or Babel (tech PR) go deeper in one area. If your problem is narrow, for example poor lead quality from LinkedIn, a specialist London B2B marketing agency usually gets there faster.
Can They Show Pipeline Results From Named Clients?
B2B marketing should be judged on pipeline and revenue, not impressions. Ask for case studies with named clients and figures you can check, such as pipeline created or closed business. Several agencies on this list publish these numbers on their sites, which is a good sign of how they report to clients.
Do They Understand Your Sector And Buying Committee?
Selling cyber security to a CISO is very different from selling consultancy to a general counsel. Look for an agency that already works in your sector and can explain who sits on your buying committee, what content each person needs and how long your sales cycle usually runs.
How Will They Work With Your Sales Team And CRM?
Many B2B campaigns fail at the handover between marketing and sales. Ask how the agency defines a qualified lead, how it feeds data into your CRM and whether it will join pipeline reviews. Agencies with RevOps or HubSpot depth can help here even if they are not running every campaign.
What Budget Should You Expect?
Budgets vary widely by scope. Some specialists publish minimum engagement sizes, while network agencies typically work on larger retainers. Ask each agency for a costed proposal against the same brief so you can compare like for like. Our guide to marketing agency costs in London sets out typical pricing models.
The best B2B marketing agencies in London combine sector knowledge with a clear link between marketing activity and pipeline. Global groups such as Transmission, tmp and Ledger Bennett suit enterprise vendors running programmes across regions, while specialists such as Gripped, Babel and Fifty Five and Five suit companies with a narrower brief and a need for speed.
Shortlist two or three agencies whose clients look like you, give them the same brief and compare how they plan to measure success. For more London service providers, browse the rest of our London lists.
