Refolk
Sign in

Top Series B companies in Boston

Companies that have closed a Series B - proven scaling motion, hiring aggressively. Filtered to companies headquartered in Boston.

Edit the query above, or pick a refinement. 100 free credits on sign-up, no card needed.

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

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

  1. 1
    Foundation Medicine· Boston, Massachusetts, United States
    • Series B
    • 1.8k employees
    • Founded 2010
  2. 2
    Mendix· Boston, Massachusetts, United States
    • Series B
    • 1k employees
    • Founded 2005
  3. 3
    Lusha· Boston, Massachusetts, United States
    • Series B
    • 360 employees
    • Founded 2016
  4. 4
    iboss· Boston, Massachusetts, United States
    • Series B
    • 357 employees
    • Founded 2003
  5. 5
    InStride Health· Boston, Massachusetts, United States
    • Series B
    • 315 employees
    • Founded 2021
Reveal 104 more·100 free credits, no card

Find engineers at Series B companies in Boston

Series B companies in Boston are some of the fastest-moving employers in the market. The list above ranks the largest Series B-stage companies headquartered in Boston by current headcount, drawn from public LinkedIn and Crunchbase records. With 109 matching companies in our index, the density of senior engineers, designers, and founders is unusually high.

At Series B, teams tend to be small, ambitious, and on the hunt for senior talent. The companies on this list are good signals for where the Bostontalent 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 B companies in Boston” or “senior engineers at Series B companies in Boston hiring” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled Series B 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: Sun, 21 Jun 2026 10:58:03 GMT

Need an even more specific search?

Refolk runs natural-language searches across LinkedIn, GitHub, and the open web. Try one of these:

Related lists

See all company lists.

Or zoom out