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Top Series B AI companies

Companies building AI products, foundation models, and applied ML platforms. Filtered to companies whose latest disclosed round is Series B.

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Built from a search like: Top Series B AI companies

Ranked by current headcount across Series B AI companies. Refreshed monthly.

  1. 1
    Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes· Taiwan

    The main objectives are as follows:‧Develop novel biotechnology and pharmaceutical R&D. Discover new drugs for local-prevalent diseases and other diseases based on medical needs. ‧Coordinate domestic collaborative efforts in drug R&D to better utilize the available resources. ‧Transfer drug candidates to pharmaceutical companies to improve biotechnology and pharmaceutical industries in Taiwan.

    • Series B
    • 266 employees
    • Founded 2019
  2. 2
    Populix· Gambir, Jakarta, Indonesia

    Populix helps companies & governments to understand, penetrate, and dominate Southeast Asia — the world’s most dynamic market.Our Services:● Market ResearchData-driven insights on consumer behavior, industry trends, and competitive dynamics to help businesses make informed decisions. From brand performance tracking to product validation, our solutions & methodologies ensures companies stay ahead in Indonesia’s fast-growing market.Solutions: Brand Research, Product Research, Advertisement Research, Customer Experience, Market Overview, Service Only, Research Amplification● Policy & Society ResearchPublic sentiment, policy impact, and societal trends analysis to help organizations and governments make data-driven decisions. From economic behavior to social change, our research provides clear, actionable insights into Indonesia’s dynamic landscape.Solutions: Strategic Planning & Program Evaluation, Social & Behavioral Research, Policy & Index Development, Economy & Bussiness Solutions, Strategic Communication, Research Amplification● PopSurveySurvey-building and respondent solutions for academic and applied research. PopSurvey empowers students, researchers, and professionals to collect credible, fast, and affordable data, with AI-assisted tools and verified respondents to simplify the overall survey process.Capabilities: Survey Builder, Respondent Solution, NeXa AI Research Assistant, and others● Respondent OnlyConnecting businesses and researchers with high-quality, targeted respondent panels, efficiently and hassle-free. Whether for product testing, market validation, or internal research, our respondent solution delivers the right audience to match your exact criteria across the region.Capabilities: Respondent Fulfillment, Multi Tools Compatibility, Simple Setup, and others

    • Series B
    • 242 employees
    • Founded 2018
  3. 3
    User Interviews· New York, New York, United States

    User Interviews, now part of UserTesting, gives you fast access to quality participants for 🧑💻 user research, 📊 market research, and 🤖 AI training. With 6 million participants, precise matching, and fraud prevention, we can reliably fill any research study. Connect with the right people in any niche, whether your target audience is consumers, B2B professionals, or domain experts needed for model training.Source, screen, track and pay participants, then move seamlessly from data collection to deep analysis, all in one place. Our flexible platform and powerful integrations make it easy for enterprises, technology partners, and agency teams to run any kind of research with confidence.Get started at https://www.userinterviews.com and check out the latest UX and research insights at https://www.userinterviews.com/resources.

    • Series B
    • 214 employees
    • Founded 2016
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  5. 4
    QuEra Computing Inc.· Boston, Massachusetts, United States

    Quantum computing is moving from "one day" to "day one." QuEra Computing is leading that transition.Founded in 2018 on breakthrough research from Harvard and MIT, QuEra builds neutral-atom quantum computers using a unique multi-zone architecture. The result: reconfigurable qubit connectivity, room-temperature operation, and a scalable path to fault-tolerant quantum computing, with dozens logical qubits already demonstrated.QuEra systems are operational today. The company delivered a 260-qubit quantum computer to Japan's AIST integrated with one of the world's most powerful supercomputers, earned selection for DARPA's Quantum Benchmarks Initiative, and offers its Aquila quantum computer on Amazon Braket. Its Gemini gate-based system extends these capabilities for enterprise and research applications.Backed by $230M from Google, NVIDIA, SoftBank, and others, QuEra partners with Dell Technologies, NVIDIA, Deloitte, and a 29-member Quantum Alliance. Headquartered in Boston with operations in Japan and the UK. Visit quera.com to learn more.

    • Series B
    • 208 employees
    • Founded 2018
  6. 5
    World Labs

    World Labs is a frontier AI research and product company. Our mission is to empower and augment humanity's capabilities, transforming how we live and work by advancing spatial and physical intelligence - enabling AI to model the world and reason about objects, places, and interactions across space and time. It is the foundation for both creating worlds and interacting within them: perceiving the world around us, anticipating the consequences of actions, and operating reliably in both virtual and physical worlds.The world models we are building today are the foundation of that future — one that truly empowers people and businesses by augmenting humanity's capabilities for how we work and live, revolutionizing storytelling, creativity, robotics, scientific discovery, and beyond.These are ambitious goals, so we are building an ambitious company to tackle them. World Labs was founded by AI pioneer Fei-Fei Li alongside Justin Johnson, Ben Mildenhall, and Christoph Lassner, leaders in machine learning, generative AI, computer vision, and graphics. Today, our team spans research, engineering, robotics, product, design, and business, creating a tight feedback loop between frontier research and products and solutions that empower our customers and partners.Excited about our vision? Come join us.

    • Series B
    • 107 employees
    • Founded 2023

Find engineers and founders at Series B AI companies

Series B AI companies are some of the most active hirers in the market. The list above ranks the largest AI companies whose latest disclosed round is Series B, by current headcount, drawn from public LinkedIn and Crunchbase records. Across 49 matching companies, you’ll find senior engineers, founding designers, and operators worth tracking.

Companies at this stage in AI 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 AI talent is concentrating right now.

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

How this list is built

Refolk pulled AI 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: Fri, 18 Sep 2026 07:44:44 GMT

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How is this ranking built?

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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