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Top Series A companies in Boston

Companies that have closed a Series A - product-market fit confirmed and scaling. Filtered to companies headquartered in Boston.

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Built from a search like: “Top Series A companies in Boston”

Ranked by current headcount across Series A companies headquartered in Boston. Refreshed daily.

  1. 1
    Temu· Boston, Massachusetts, United States

    Temu is an e-commerce company that connects consumers with millions of merchandise partners, manufacturers and brands with the mission to empower them to live a better life. Temu is committed to bringing affordable products onto its platform to enable consumers and merchandise partners to fulfill their dreams in an inclusive environment. Temu was founded in Boston, Massachusetts in 2022.

    • Series A
    • 8k employees
    • Founded 2022
  2. 2
    University of Massachusetts· Boston, Massachusetts, United States

    The University of Massachusetts is a five-campus public research university system renowned for the quality of its academic programs, the scope and excellence of its research, and the strength of its public service mission. UMass provides access to high-quality, affordable education that advances knowledge and improves the lives of the people of the Commonwealth, the nation and the world.

    • Series A
    • 3.5k employees
    • Founded 2020
  3. 3
    Continuum· Boston, Massachusetts, United States

    EPAM Continuum is a global innovation design consultancy. Our work is informed by the needs, desires, and aspirations of people: customers, patients, citizens, and those who make our client organizations work.EPAM Continuum started with the revolutionary notion that innovation could arise from a concern for human beings. We believed it wasn’t only the domain of science and technology, but could be found by crossing boundaries. Disciplinary boundaries. We sought to "do well by doing good."Our future is still about "doing well by doing good," but as the world grows continually more complex, our capabilities keep evolving. As we mature, the people and industries we serve, and the problems we address, expand. We embrace the next "What if..." and relish the challenges it engenders.We bring to every project a global perspective, with world-class capabilities and local sensibilities. EPAM Continuum operates with a collective purpose of making a difference—in people’s lives and in our clients’ bottom line.We innovate with, not at, our clients. We take your business today to where you want to be in the future. Join us.

    • Series A
    • 532 employees
    • Founded 1983
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  5. 4
    Mentor Collective· New Boston, Massachusetts, United States

    Mentor Collective is the definitive AI-powered operating system for mentorship, transforming talent development, retention, and long-term success into a scalable, data-informed human network. Backed by the industry’s most extensive dataset on mentorship impact, we empower education providers, workforce organizations, and companies to build connected ecosystems for learners, workers, and leaders.Recognized as a BuiltIn Best Place to Work and an Inc. 5000 company for four years in a row, we've powered over 500,000 mentorship relationships across 180+ partnerships.Let's build a stronger, more resilient economy—together.

    • Series A
    • 486 employees
    • Founded 2015
  6. 5
    Ataccama· Boston, Massachusetts, United States

    AI has raised the stakes for enterprise data. Organizations need data they can trust to power decisions, meet regulatory requirements, and build reliable AI.Ataccama helps enterprises create trusted, AI-ready data.The Ataccama ONE platform provides a unified data trust layer for the modern AI stack. It brings together data quality, observability, governance, lineage, and reference and master data management so organizations can understand their data, manage risk, and maintain confidence in the information that drives their business.Unlike fragmented data management tools that only detect problems, Ataccama uses an agentic approach to help teams act on them. The ONE AI Agent works as a digital data steward that helps identify issues, generate quality rules, and resolve problems across the data estate.Leading enterprises rely on Ataccama to reduce risk, support regulatory compliance, and deliver trusted data for analytics, operations, and AI.

    • Series A
    • 442 employees
    • Founded 2007
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Find engineers at Series A companies in Boston

Series A companies in Boston are some of the fastest-moving employers in the market. The list above ranks the largest Series A-stage companies headquartered in Boston by current headcount, drawn from public LinkedIn and Crunchbase records. With 208 matching companies in Refolk’s index, the density of senior engineers, designers, and founders is unusually high.

At Series A, teams tend to be small, ambitious, and on the hunt for senior talent. The companies on this list are good signals for where the Boston talent market is heating up - and for which engineers and founders are about to become tomorrow’s operators.

Refolk converts this list into a live search. Ask for “founders of Series A companies in Boston” or “senior engineers at Series A companies in Boston hiring” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled Series A companies headquartered in Boston from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 12:20:57 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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The underlying index updates continuously and this page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 12:20:57 GMT.

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