Top Series B Marketing tech companies

Tools for marketers: CRM, attribution, content, ads, growth, and analytics. Filtered to companies whose latest disclosed round is Series B.

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Ranked by current headcount across Series B Marketing tech companies. Refreshed monthly.

1
XR Extreme Reach· New York, New York, United States
XR Extreme Reach is the leading platform for managing advertising operations. We help brands manage all aspects of their ad creative, from talent payments and rights to ad delivery, so every ad lands how and where it should.
- Series B
- 994 employees
- Founded 2008
2
PT. The Nielsen Company Indonesia· Indonesia
Nielsen is a global performance management company that provides a comprehensive understanding of what consumers Watch and Buy. Nielsen’s Watch segment provides media and advertising clients with Total Audience measurement services across all devices where content — video, audio and text — is consumed. The Buy segment offers consumer packaged goods manufacturers and retailers the industry’s only global view of retail performance measurement. By integrating information from its Watch and Buy segments and other data sources, Nielsen provides its clients with both world-class measurement as well as analytics that help improve performance. Nielsen, an S&P 500 company, has operations in over 100 countries that cover more than 90 percent of the world’s population. For more information, visit www.nielsen.com.
- Series B
- 707 employees
- Founded 2006
3
21GRAMS· New York, New York, United States
21GRAMS is the advertising and education arm of Real Chemistry. Ranked the #2 health agency in the world by Cannes Lions. More than a name, 21GRAMS is the philosophy that guides everything we do. Inspired by the “21 Grams Experiment” of 1907, which tried to prove the existence of a soul – we believe great work connects with the human spirit. So we get to know our audiences better than anyone (through the ancient art of human interaction and Real Chemistry’s industry-leading data and analytics) and find the 21 grams that makes people tick. Our goal? Make advertising less of an interruption – and more worth people’s time, attention, and action – because it actually “gets” them. Creatively, our mantra is “medicine should be more inspiring than sneakers”. We aren’t here just to do the best work in our industry, but the most inventive work period. That ability is heightened, as part of Real Chemistry. Interacting and combining unalike disciplines, talents, and technologies (across Clinical, Commercial, and Corporate) to create new answers to modern health’s biggest challenges.
- Series B
- 498 employees
- Founded 2017
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4
LoyaltyOne· Toronto, Ontario, Canada
As Canada's most recognized loyalty program, the AIR MILES coalition has more than 200 retailer brands, 100s of online retailers, and two AIR MILES credit card partners. AIR MILES Cards are swiped a thousand times a minute, every minute of every day, 7 days a week, from grocery stores to gas stations to home improvement centers, leading to a reward being redeemed every 3.3 seconds. What that means for our clients is deep, valuable insights that let them connect with their shoppers like never before.There’s a reason we’re recognized as one of the best places to work year after year: We have an amazing culture thanks to the collaboration, dedication, and fun that our teams bring to work every day. Discover our core values, stay up to date with the latest events at AIR MILES, get to know our people, and find out firsthand what makes AIR MILES such a great place to work.For more information, visit www.loyalty.com
- Series B
- 478 employees
- Founded 2014
5
TripleLift· New York, New York, United States
TripleLift is the Creative SSP that transforms digital advertising through creative technology and innovative ad formats. We help publishers, advertisers, and agencies achieve measurable outcomes while enhancing user experiences.Discover how we bring creativity and results together.
- Series B
- 362 employees
- Founded 2012

6
Firefly· New York, New York, United States
Founded in 2017 in Silicon Valley, Firefly pioneered car-top advertising, transforming urban landscapes with the world’s most advanced moving digital screens. Recognized as one of Time Magazine’s Best Inventions of 2019, we have been at the forefront of the OOH industry since our launch, integrating data-driven targeting and smart city partnerships to deliver measurable high-impact campaigns.With a strong presence in all major U.S. markets, Firefly continues to expand its global footprint, operating in the UK, Canada, Spain, and the UAE. Beyond our high-impact digital tops, which deliver dynamic messaging with eye-level visibility, our static car tops, car wraps, in-car & golf screens, and experiential offerings further enhance brand reach, ensuring precision and impact in every campaign. At Firefly, we believe in empowering people—from the drivers who earn extra income through our platform to the talented team members shaping the future of OOH advertising. We foster an environment where collaboration, creativity, and growth drive everything we do.As one of the fastest-growing OOH companies in the US, Firefly is redefining out-of-home advertising at scale, delivering high-performance solutions for brands, cities, and businesses worldwide.
- Series B
- 348 employees
- Founded 2017
7
Firework· San Mateo, California, United States
Firework is powered by enterprise-grade infrastructure designed to scale personalized video experiences and agentic shopping journeys across digital commerce.• AI Video Solutions power Shoppable Video, Video Showrooms, and AI Content Solutions, enabling brands to source and curate authentic influencer, UGC, and social-native content, while also generating commerce-ready video through AI. By optimizing video content operations, Firework transforms video into a scalable engine for discovery, education, and conversion.• AI Agentic Solutions introduce contextual, real-time shopping assistance through the AI Shopping Agent. The agent interprets shopper intent to deliver personalized answers and guidance alongside shoppable video throughout the shopping journey. By combining conversational intelligence with personalized video delivery, Firework helps shoppers make confident decisions and move toward purchase.Together, these solutions operate within a unified system, where content, intelligence, and video commerce continuously reinforce one another, built for enterprise scale and seamless deployment across DTC sites, retailer platforms, and omnichannel experiences.
- Series B
- 345 employees
- Founded 2017
8
NewtonX· New York, New York, United States
NewtonX is the only B2B research intelligence platform that delivers AI-speed insights with data you can trace. We help businesses make faster, more defensible decisions, built on verified data across 140+ industries, AI-native automation, and end-to-end research expertise. Trusted by Google, TikTok, Salesforce, Stripe, Microsoft, and Coinbase. Research cited by Gartner, Fortune, Forbes, Adweek, and The Wall Street Journal.
- Series B
- 342 employees
- Founded 2017
9
Hitwise (Experian)· Santa Monica, California, United States
We want to inform you that for reasons outside of our control, we have closed our company, Hitwise as of February 2020. Hitwise (www.hitwise.com) Hitwise provided marketers unique insights based on the largest sample of internet behavior and consumer attitudes—revealing the audiences, search terms, and traffic sources that they need to get a competitive edge. Marketers used Hitwise’s powerful audience modeling and activation technology to segment and target their prospective customers.
- Series B
- 283 employees
- Founded 2000
10
JumpCrew· Nashville, Tennessee, United States
Launch-ready sales teams, experienced leaders, and time-tested processes to help you acquire new customers faster and with less risk than doing it alone.We've driven over $5B in pipeline for more than 450 companies like Alibaba, X (formerly Twitter), Airbnb, Nextdoor, Zillow, Cintas, and Experian. Our clients trust us to build awareness, drive leads, close sales, and increase LTV.JumpCrew was acquired by iQor CXBPOTM in August 2025 to accelerate lead generation as part of iQor's seamless end-to-end customer lifecycle service, backed by global scale and infrastructure.
- Series B
- 258 employees
- Founded 2016

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Find engineers and founders at Series B Marketing tech companies

Series B Marketing tech companies are some of the most active hirers in the market. The list above ranks the largest Marketing tech companies whose latest disclosed round is Series B, by current headcount, drawn from public LinkedIn and Crunchbase records. Across 152 matching companies, you’ll find senior engineers, founding designers, and operators worth tracking.

Companies at this stage in Marketing tech share a profile: a working product, fresh capital, and a hiring plan that wants senior people yesterday. Looking at headcount, last round, and HQ side by side gives you a quick read on where Marketing tech talent is concentrating right now.

Refolk converts this list into a search. Ask for “Series B Marketing tech founders hiring senior engineers” or “design leads at Series B Marketing tech companies” and Refolk returns a fresh ranked shortlist with the sources behind each match.

How this list is built

Refolk pulled Marketing tech companies whose latest disclosed funding round is Series B from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes monthly.

Last refreshed: Tue, 18 Aug 2026 09:54:31 GMT

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The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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