Top Series B companies in Boston
Companies that have closed a Series B — proven scaling motion, hiring aggressively. Filtered to companies headquartered in Boston.
- StageSeries B
- HQBoston
- Matches113
Built from a search like: “Top Series B companies in Boston”
Ranked by current headcount across Series B companies headquartered in Boston. Refreshed daily.
- 1Foundation Medicine· Boston, Massachusetts, United States
- Series B
- 1.8k employees
- Founded 2010
- 2Mendix· Boston, Massachusetts, United States
- Series B
- 1.1k employees
- Founded 2005
- 3Lusha· Boston, Massachusetts, United States
- Series B
- 366 employees
- Founded 2016
- 4iboss· Boston, Massachusetts, United States
- Series B
- 360 employees
- Founded 2003
- 5InStride Health· Boston, Massachusetts, United States
- Series B
- 297 employees
- Founded 2021
- 6HYCU, Inc.· Boston, Massachusetts, United States
- Series B
- 251 employees
- Founded 2018
- 7Vendr· Boston, Massachusetts, United States
- Series B
- 220 employees
- Founded 2019
- 8Form Health· Boston, Massachusetts, United States
- Series B
- 214 employees
- Founded 2019
- 9NetWitness· Boston, Massachusetts, United States
- Series B
- 189 employees
- Founded 1997
- 10Teikametrics· Boston, Massachusetts, United States
- Series B
- 184 employees
- Founded 2015
- 11Origin· Boston, Massachusetts, United States
- Series B
- 166 employees
- Founded 2018
- 12NewStore· Boston, Massachusetts, United States
- Series B
- 165 employees
- Founded 2015
- 13Videa· Boston, Massachusetts, United States
- Series B
- 165 employees
- Founded 2018
- 14Black Kite· Boston, Massachusetts, United States
- Series B
- 164 employees
- Founded 2016
- 15Posh· Boston, Massachusetts, United States
- Series B
- 159 employees
- Founded 2018
- 16Hi Marley· Boston, Massachusetts, United States
- Series B
- 158 employees
- Founded 2017
- 17QuEra Computing Inc.· Boston, Massachusetts, United States
- Series B
- 152 employees
- Founded 2018
- 18Grip Security· Boston, Massachusetts, United States
- Series B
- 152 employees
- Founded 2021
- 19Mori· Boston, Massachusetts, United States
- Series B
- 138 employees
- Founded 2016
- 20CodaMetrix· Boston, Massachusetts, United States
- Series B
- 138 employees
- Founded 2019
- 21Current Health· Boston, Massachusetts, United States
- Series B
- 137 employees
- Founded 2015
- 22Mine· Boston, Massachusetts, United States
- Series B
- 135 employees
- Founded 2019
- 23Pickle Robot Company· Boston, Massachusetts, United States
- Series B
- 129 employees
- Founded 2018
- 24Empatica· Boston, Massachusetts, United States
- Series B
- 127 employees
- Founded 2011
- 25IP Fabric· Boston, Massachusetts, United States
- Series B
- 117 employees
- Founded 2015
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 113 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
Last refreshed: Thu, 07 May 2026 06:43:22 GMT
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