The Best Series B SaaS Marketing Agencies for Scaling Pipeline

Team 4 is a London agency that works with B2B SaaS companies and runs SEO, GEO (visibility in AI search), content, analytics and paid media as one programme, which it calls the Inbound Engine®. Its website calls it “The B2B SaaS Marketing Agency from seed to £20m+ ARR”. For a Series B company, that means inbound and paid planned by the same team, with paid used to capture demand that organic search has not yet reached.

Team 4 says it has worked with SaaS companies at every funding stage, from seed to Series C and later. Those clients are confidential, so there is no named Series B case study to read. Instead, its profile sets out how it works: Team 4 maps the full acquisition set-up before it executes anything, starting at the bottom of the funnel, and works out what is driving conversions before paid spend is scaled. Its website lists European Search Awards finalist places in 2025 and 2026.

Team 4 suits Series B SaaS companies with a clear ICP, often in a specialist vertical, that want to grow pipeline without paid channels carrying all of it. Senior strategists do the work, with no account managers in between. It suits less a company that wants high-volume content with no strategy behind it, or one that only needs a paid media manager.

Refine Labs is an Austin demand generation agency for mid-market and enterprise B2B SaaS. It helps companies change how marketing is measured and run, moving from lead-based reporting to revenue accountability, and its website lists demand generation, marketing operations and creative services. Founded in 2019, it builds demand through brand, content and organic social, then converts the buyers who come looking.

Its website is direct about stage: “We work with B2B tech companies at Series B and beyond.” A page about its events says the same of B2B SaaS companies. The clients it names include Clari, Firstup, myCOI and dotCMS. Our review notes its “Revenue R&D for B2B SaaS” positioning, its quantified client impact and a transparent team and methodology.

Refine Labs suits Series B companies whose pipeline targets have outgrown MQL reporting, with a marketing leader who has the mandate to change what the team measures and where budget goes. It suits less a team that only needs paid campaigns managed, or a board that still wants MQL targets.

SimpleTiger is a Sarasota agency that works only with B2B SaaS. Its services cover SEO and AEO, content, paid search and social, link building, GEO (AI search) and Webflow sites, so a Series B company can run organic and paid search with one team that knows how software is bought.

Its website gives a range rather than naming Series B: “We've helped SaaS startups go from seed funding to IPO with our SEO & PPC services.” Another page talks of clients “from seed funding to publicly traded unicorns”, and we read that range as covering Series B. Clients named on its site include Gainsight, Firecrawl, Jotform, Invoca and Segment. Its Gelato case study reports a 1200% rise in first-page keyword rankings in 12 months and a 3:1 ROI in year one, and the agency has worked only with B2B SaaS for more than 15 years.

SimpleTiger suits Series B SaaS companies that want search, AI search and paid run together on a Webflow site built for search. Because its stage wording spans every round, a company that wants a Series B example should ask for one before signing.

Gripped is a London agency, founded in 2017, that works only with SaaS, AI and tech companies. It runs paid media, SEO, content, GEO and ABM as one demand programme, and as a HubSpot Diamond Partner it also sets up the CRM and automation underneath.

Its FAQ page says: “We work primarily with Series A and B companies who need to scale their pipeline.” Our review found case studies reporting “£2.1m pipeline from demand gen” and a pricing page with packages. Clients named on its website include Ideagen, Epicor, Ravelin and Crownpeak. Our earlier reviews place its usual clients between £2M and £50M ARR, and its focus on revenue attribution answers the pipeline questions investors start asking at this stage.

Gripped suits UK and European Series B companies that want inbound, paid and HubSpot run together, with marketing and sales reporting from the same data. It suits less a company that already has a mature HubSpot set-up and only needs a specialist for one channel.

Rock The Rankings is a Chicago SEO and content agency, running since 2018, that works with B2B SaaS and tech companies. It goes after bottom-of-funnel searches that turn into demos and trials, and its website lists AI search optimisation (GEO), programmatic SEO, attribution tracking and pipeline reporting.

Its stage page describes the Series A to B buyer in plain terms: “You have content but no system behind it, a first marketing hire underwater, and a board asking about CAC payback.” For that stage it offers a full programme, with a forecast set before kickoff and graded against it monthly. Our review notes case studies with SaaS MRR and traffic growth figures, and a clear team page but no published pricing.

Rock The Rankings suits Series B companies whose inbound has stalled and whose board wants search tied to CAC payback. It suits less a team that mainly needs paid media, as search and content are its whole offer.

SaaS Hero is a Denver agency that runs paid search and social, landing pages, conversion rate optimisation and ad creative for SaaS companies, with conversion tracking and attribution reporting built in. Its tagline calls it “The client-friendly SaaS marketing agency that proves pipeline”.

Its website has a page about Series B SaaS. It says SaaS Hero optimises paid media against CRM revenue data, runs the chain from ad to landing page to CRM reporting as one team, and charges a flat retainer indexed to total monthly ad spend, and that these choices make it “the strongest fit for Series B SaaS companies”. That is the agency's own claim. Our review notes its published pricing, CRM-level reporting and the pipeline and cost-efficiency wins it claims on its service and case pages.

SaaS Hero suits Series B companies where paid is the main growth channel and the board wants spend judged on revenue in the CRM. It suits less a company that wants SEO and content to lead, as its website centres on paid media and conversion work.

Hey Digital is a Tallinn agency, founded in 2018, that works only with B2B SaaS on paid media. It plans and runs paid search and paid social, builds landing pages, and produces ad creative and video ads, aiming for trials, demos and pipeline rather than clicks.

Its growth marketing page says every account has a senior B2B SaaS strategist “with hands-on experience scaling paid programs from Series A through Series C”, a range that takes in Series B. Clients named on its website include PostHog, Rosie, Toggl, SocialBee, Hotjar and WriteSonic, and its case studies cover PostHog, Toggl, WriteSonic and StealthGPT. Our review notes quantified SaaS case studies and a clear process, with no published pricing.

Hey Digital suits Series B companies that need paid search and social scaled with creative made in-house, and that want frequent updates on what each test showed. It suits less a company whose main gap is SEO or content.

Skale is a London SEO agency for B2B SaaS and tech brands. It builds organic channels through SEO strategy, content, technical fixes, link building and site migrations, and its website now lists AI search optimisation too. The team often works alongside in-house marketers and reports on trials, MRR and CAC payback rather than traffic.

Skale's Series B evidence is one client, not a stated focus. Its case study page describes Attest as “a series B consumer research platform that has raised more than $95m in investment funding”, and Slite as a Series A collaboration software platform. Other named clients include Piktochart, Perkbox, Moonpay, Maze and Holded. Case study titles include “Maze boost monthly organic signups by 283% in six months” and “Helping Happy Scribe grow from 2,700 to 70,000 monthly signups”.

Skale suits Series B companies, especially product-led ones that sell through sign-ups and trials, that want organic search to carry more of the pipeline. Its website shows one Series B client, so ask for more examples at your stage.

Foundation Labs is the research and content arm of Foundation, the Halifax agency founded in 2014 by Ross Simmonds. It builds category authority with research-led content, then spreads each piece across search, social, Reddit, YouTube and AI answers. Its website now describes Foundation as an AI visibility and GEO marketing agency.

Foundation Labs qualifies for this list through general venture-backed wording, not a named round. Its work page describes “A VC-backed healthcare startup” that hired Foundation to build a content marketing strategy for reaching decision-makers, and its site does not mention Series B. Case study titles include “How We Helped Bitly Become a Top-Cited Brand in AI Search” and “How Foundation Helped a SaaS Company Increase Sign Ups by 128%”, and our review notes a reported 300%+ rise in social engagement.

Foundation Labs suits Series B companies that want original research to make them the name cited in their category, in search results and AI answers. It suits less a team that needs paid media or pipeline this quarter, and buyers should ask for examples from Series B SaaS companies.

NoGood is a New York growth marketing agency that works with SaaS brands on paid media, content, SEO, AEO, lifecycle marketing and conversion work. Its approach is test and learn: quick iteration, creative sprints and a bigger share of budget for whatever performs.

NoGood qualifies for this list through general venture-backed wording, not a named round. Its New York page says it works with established brands and “fast-growing VC-backed startups”, and does not mention Series B. Clients named on its website include MongoDB, Intuit, Inflection AI, Oura, Chime and TikTok. Our review notes public case studies with quantified results on acquisition cost and return, and its awards include The Shorty Awards and The Webby Awards.

NoGood suits Series B companies in competitive markets that want several channels tested against each other and budget moved quickly to what works. It suits less a company that wants one channel run in depth, or that needs proof of Series B SaaS work before signing.

Omni Lab is an Austin paid media agency for B2B SaaS. It runs campaigns on Google, LinkedIn, Meta and YouTube, splits spend between brand development and direct response, and uses offline CRM conversion tracking so each channel is judged on pipeline rather than cost per lead.

Its FAQ says it works with Series A to D or PE-backed B2B SaaS brands spending between $10K and $1M a month on paid media, with product-market fit and at least one in-house marketer to help with internal alignment. That range includes Series B. Case study titles include “How Omni Lab helped ShareGate grow SQLs 44% year over year” and “How Omni Lab helped Thoropass double paid SQLs in one quarter”, and its website also names Billd and Miter.

Omni Lab suits Series B companies with a paid budget in that range and a marketer in-house who can own strategy. It is not a CRM or RevOps partner, and a company whose main gap is organic search would need another agency for that work.

Grow & Convert is a San Francisco content agency, founded in 2016, that builds inbound for B2B SaaS through bottom-of-funnel content: comparison, alternative and use-case pages that buyers read when they are close to choosing. Its website lists content, SEO, AI search, link building and paid search.

Grow & Convert qualifies for this list through general venture-backed wording, not a named round. Its FAQ describes its clients as “Venture backed B2B businesses looking to lower CAC and grow inbound lead generation”, and one case study is titled “How We Developed a Content Strategy for a Venture-Backed Platform”. Neither mentions Series B. Clients named on its site include Wrike, Service Titan, Leadfeeder and Crazy Egg, and our review notes reported results of “+1,745 free-trials” and “+232k organic sessions”.

Grow & Convert suits Series B companies that want inbound to bring down acquisition cost and that sell something buyers search for by name or problem. It suits less a company that needs paid media scaled fast, as content is its main service.