Best Marketing Agencies in London (2026)

Introduction

London is the main European base for performance, growth and B2B marketing agencies, and several of the largest were founded or are headquartered here. The 13 agencies below were chosen for recent work, 2025 and 2026 recognition, and the strength of their client rosters.

Ownership in this part of the market has shifted towards private equity and tech-led groups. The Brandtech Group bought Jellyfish in 2023, Carlyle holds a majority of Incubeta, and Falfurrias Capital Partners has backed Brainlabs since 2023. The networks have been reorganising too. After Omnicom completed its acquisition of IPG, it folded MRM into Critical Mass and Rapp in March 2026, then moved Rapp under Critical Mass in June, months after Campaign named Rapp UK its Performance Marketing Agency of the Year 2025. Search is also changing the work itself: many of the agencies here now sell ways to measure and improve how brands appear in AI assistants as well as in Google.

Every agency here has an active London office in 2026. The list covers full-funnel, performance, search-led and B2B specialists, and runs in no fixed order of merit. Social-first agencies have their own page.

The best marketing agencies in London

1. Jellyfish

Owned by The Brandtech Group · London · jellyfish.com

Jellyfish combines media, creative and data, and has been part of The Brandtech Group since 2023, alongside Oliver and Pencil. It employs around 2,000 people in some 40 offices. It started as a performance business and has moved towards integrated brand and performance work: its creative arm now numbers more than 400 people, and since its first Cannes Lion in 2024 (for an Apple TV social campaign launching Severance season two) it has collected over 40 creative awards, including two Grand Clios for Apple TV and Netflix.

Clients include Netflix, Google, Toyota, Swarovski and Virgin Atlantic. Jellyfish built Share of Model, a tool that measures how visible a brand is inside large language models, and in March 2025 Adweek reported that its AI agents had cut campaign launch times by 65%. If automation matters to your brief, ask which tasks agents handle and who reviews their output.

2. Brainlabs

Management-owned, backed by Falfurrias Capital Partners · London · brainlabsdigital.com

Dan Gilbert founded Brainlabs in London in 2012 after leaving Google. The agency grew through eight acquisitions with Livingbridge’s backing from 2019, and Falfurrias Capital Partners became its investor in 2023. It now has more than 1,000 staff and manages over $1.5 billion of annual media spend for more than 250 brands, across search, paid social, programmatic, influencer, SEO, AI visibility and measurement.

The agency is known for its “Test and Earn” method and for hiring engineers and scientists, many through its graduate academy in Buenos Aires. Clients shown on its site include Netflix, Hilton, Microsoft, Klaviyo and Polaroid. It frames its work around revenue and profit rather than platform metrics, which is a useful starting point for agreeing how success will be measured.

3. Croud

Independent · London · croud.com

Croud is an independent media, creative and data agency with offices in London, Shrewsbury, New York, Atlanta and Dubai. It mixes more than 600 in-house staff with a network of over 2,900 on-demand specialists in 118 markets, which suits brands that need local-language search and social work in many countries at once. It took a bronze at Campaign’s UK Agency of the Year Awards 2025.

Published work includes enquiry growth for flexible-workspace group IWG, improved return on ad spend for camera marketplace MPB, and sales growth for Timberland. Ask how the on-demand network is managed and who owns quality control on your account.

4. Incubeta

Majority-owned by Carlyle · London · incubeta.com

Incubeta was formed in 2001 from a group of marketing companies and is headquartered in London, with UK offices in Belfast and Manchester as well. Carlyle took a majority stake in 2022. The agency has a long Google partnership and premier partnerships with TikTok, Amazon, Meta and Microsoft, and it has kept buying: Shout Bravo, Persuasion Technologies and RocketSource in 2024 and 2025, then XPON’s Google Marketing Platform and Google Cloud business in June 2026.

Its work is organised around measurement, media investment and data-led creative. Clients include adidas, L’Oréal, Heineken, P&G, M&S, Harrods and Nando’s. It is a strong fit for brands that run most of their media through the Google stack.

5. Impression

Independent, B Corp · Borough · impressiondigital.com

Impression started in Nottingham and runs a London office on Borough High Street, along with Manchester and New York. It is an independent, certified B Corp and appeared on The Drum’s list of the top 100 independent agencies for 2026. Its awards record is heavy on search and paid media: Independent Agency of the Year at the Global Agency Awards in 2025 and 2026, Large Paid Media Agency of the Year at the European Paid Media Awards 2025, and Best UK SEO Campaign at the Global Search Awards 2026.

Clients include Wizz Air, Norse Atlantic Airways, Specsavers, Clarins, Virgin and Cancer Research UK. It also appears in several of Great Place to Work’s 2025 and 2026 lists.

6. Journey Further

Privately held · Holborn · journeyfurther.com

Journey Further was founded in 2017 and now has offices in London (Kingsway, Holborn), Leeds, Manchester and New York. Campaign named it Global Performance Marketing Agency of the Year in 2022 and 2023, and in 2025 it bought Saulderson Media, an influencer and talent management agency, to add creator work to its paid and organic teams.

It describes itself as a “discovery-led” growth partner, organised around marketing science, organic media and paid media. Clients include Adobe and La Redoute. The agency runs its own event, Discovered, in October 2026.

7. Rise at Seven

Independent · London · riseatseven.com

Rise at Seven is a search-first content marketing agency with offices in Manchester, London and New York. It covers SEO, digital PR, content and social, and has put growing weight on visibility in AI search and LLMs. It has won 79 awards across UK, European and global content and search programmes, and The Drum has named it best agency outside London.

Clients include Red Bull, Emirates, JD Sports, Primark, SIXT and Parkdean Resorts. It suits brands that want search, PR and content run as one programme.

8. Tug

Founder-led · Shoreditch · tugagency.com

Nick Beck founded Tug in 2006 in the basement of Vice Media’s London office, and he still runs it as CEO. The Shoreditch headquarters leads a network of six offices, with Berlin, Toronto, New York, Sydney and Singapore. Tug works across brand and performance media, search, data and marketing technology, using AI-enabled tools it has built in house.

Published case studies include work for Mitchells & Butlers and Australian fashion retailer Suzanne Grae. It is a sensible option for consumer brands that want one agency to plan and buy across markets.

9. Brave Bison

Listed on AIM · London · bravebison.com

Brave Bison is a media, marketing and technology group headquartered in London, with hubs in Manchester, New York, Singapore, Dubai and elsewhere. Its main practices cover organic performance, paid performance, and technology and experience, and the group also owns SocialChain, Engage Digital Partners, the MiniMBA training business and the MTM insights consultancy.

Clients include New Balance, Sky, Currys, Aviva, Montblanc and Icelandair. It recently signed a partnership with Guinness World Records covering YouTube, Snap and Meta. The range is wide, so ask which part of the group will lead your account.

10. Gravity Global

Privately held · Shoreditch · gravityglobal.com

Gravity Global is a B2B marketing group headquartered on Wilson Street in Shoreditch, with further UK offices in Oxford, Norwich and Kent and a growing US network. It has expanded through acquisitions in Texas, Minnesota and Colorado, the latest being VOCO Creative in 2024. It won gold for Global B2B Marketing Agency of the Year at the B2B Marketing Awards 2025.

The work covers brand strategy, media, content and digital, mostly for complex and technical sectors. Recent case studies include Airbus, Embraer and Honda Powersports.

11. Stein

Part of MSQ Partners · London · steinb2b.com

Stein, formerly Stein IAS, is a B2B agency built around what it calls brand-to-demand experience: running brand building and demand generation as one programme. It is part of the MSQ Partners group and has offices in London, Manchester, New York, Amsterdam, Singapore and Shanghai. It took silver for Global B2B Marketing Agency of the Year at the B2B Marketing Awards 2025.

Clients include HSBC, Samsung, GE Healthcare, Celonis, Merck and Bentley. It suits technology, healthcare and financial services firms with long sales cycles.

12. Transmission

Privately held · Shad Thames · transmissionagency.com

Transmission is a B2B marketing agency based at the Clove Building near Tower Bridge, with offices in San Francisco, New York, Dallas, Sydney, Singapore, Delhi and Wrocław. Its 2026 awards include Large Agency of the Year at the B2 Awards and gold for best B2B campaign at the Reggies, and it won gold at The Drum Awards 2025 for a rebrand.

Recent clients include Qualcomm, Microsoft (Windows 11 Pro), Centrica, Iron Mountain, AutoStore and JCB. The agency runs integrated programmes, from account-based marketing to campaigns and content.

13. Hallam

Employee-owned · King’s Cross · hallam.agency

Hallam is a B2B digital marketing agency that combines brand and performance work. It is owned by an employee ownership trust, and runs offices in Nottingham and at 1 Pancras Square in King’s Cross. Recent recognition includes wins at the Global Search Awards 2025 and UK Agency Awards 2025, and it was a Marketing Week Awards finalist in 2025.

Clients include Hitachi Solutions, Holcim, Pendo, Lattice and CovertSwarm. It is a good size for mid-market B2B and software companies that want senior attention and search depth.

What to look for in a London marketing agency

Decide first which part of the funnel you need help with. Some of the agencies above, such as Brainlabs and Incubeta, are built around media buying and measurement. Others, such as Rise at Seven and Impression, lead with search and content, and the B2B specialists run long programmes that link brand to pipeline. A full-funnel agency is useful when one team should own the whole plan, though it can be more expensive than a specialist for a narrow brief.

Agree on measurement before the pitch ends. Ask how the agency attributes results, whether it runs incrementality tests, and what it will report weekly as opposed to quarterly. With search answers increasingly coming from AI assistants, it is fair to ask how an agency tracks your brand’s visibility there and what it can change.

Look at ownership and who will staff the account. Private equity and holding-company owners tend to bring acquisitions and restructures, as the 2026 changes at Omnicom showed. London agencies also share talent with their offices in Manchester, Leeds, Nottingham and abroad, so ask where the day-to-day team sits and which senior people are named on your account.

Finally, look at how the agency handles content operations. Performance work produces a large volume of ad variants, landing pages, reports and recorded calls. Agencies with a clear review process and a single place where clients can find the latest assets and decisions make long engagements easier to run.

How Fabric helps marketing agency teams

Fabric gives a marketing agency one workspace for its files, client feedback and team knowledge, with AI search across all of it. The agency setup suits the pattern most of the firms above follow: one space per client, with briefs, creative, reports and call notes kept together. There is a dedicated page on Fabric for content marketing teams.

High-volume content work needs a clear pipeline. A Kanban board turns any folder into a board whose cards are the files themselves, so ad variants and articles move from draft to approved without a separate tracker. The content planning guide shows how teams set this up. Search works by meaning across documents, PDFs, images and transcribed recordings, and reaches connected apps such as Google Drive, Notion and Gmail, which helps when a strategist needs last quarter’s test results or a client’s brand rules.

For client delivery, any file or folder can be published as a web page, for example a monthly report or a campaign proposal, and updated by editing the source. Link analytics shows when each named recipient opened a link and how long they spent with it. Clients can leave threaded comments through a shared link without creating an account.

Client calls can be recorded with AI meeting notes, with no bot joining the call. On Team plans, self-writing docs maintain a page for each client from meetings, Slack and the workspace, covering decisions, deliverables and open items.

Link analytics is included on Pro and Team plans, and self-writing docs on Team plans. See plans for teams.

Frequently asked questions

What is the best marketing agency in London?

It depends on the brief. On recent recognition, Gravity Global won Global B2B Marketing Agency of the Year at the B2B Marketing Awards 2025, Impression was named Independent Agency of the Year at the Global Agency Awards in 2025 and 2026, and Jellyfish has added more than 40 creative awards since 2024.

What is the difference between a marketing agency and an advertising agency?

Marketing agencies on this list focus on growth across channels: search, paid media, content, data and measurement, often paid against performance targets. Advertising agencies lead with brand campaigns and creative ideas. Many London brands use one of each. For the second group, see the best advertising agencies in London.

Which London agencies specialise in B2B marketing?

Gravity Global, Stein, Transmission and Hallam all focus on B2B. Gravity Global and Stein took gold and silver for Global B2B Marketing Agency of the Year at the B2B Marketing Awards 2025, and Transmission was named Large Agency of the Year at the B2 Awards 2026.

What happened to Rapp in London?

Omnicom moved Rapp under Critical Mass in June 2026 as part of a restructure of Omnicom Precision Marketing. Rapp continues to operate as a brand under the Critical Mass umbrella, and key UK client leadership stayed in place at the time of the move.

Do London marketing agencies work with brands outside the UK?

Most do. Croud, Brainlabs, Jellyfish, Incubeta and Tug all run international accounts from London, and Croud’s on-demand network covers 118 markets. Ask which office will lead your account and where the specialists sit.

Related lists

Marketing agencies in other cities: New York · Los Angeles · Chicago · Toronto · Sydney

More in London: Creative agencies · Advertising agencies · Social media agencies · Branding agencies · UX design agencies · Content studios

Run your agency on Fabric: Fabric for agencies · Fabric for content marketing · Best client portal tools