Top Series A companies in Toronto
Companies that have closed a Series A — product-market fit confirmed and scaling. Filtered to companies headquartered in Toronto.
- StageSeries A
- HQToronto
- Matches129
Built from a search like: “Top Series A companies in Toronto”
Ranked by current headcount across Series A companies headquartered in Toronto. Refreshed daily.
- 1LifeLabs Medical Laboratory Services· Etobicoke, Ontario, Canada
- Series A
- 4.3k employees
- Founded 2011
- 2JAM· Toronto, Ontario, Canada
- Series A
- 693 employees
- Founded 1996
- 3Vosyn· Etobicoke, Ontario, Canada
- Series A
- 576 employees
- Founded 2023
- 4Umbra· Scarborough, Ontario, Canada
- Series A
- 336 employees
- Founded 1979
- 5Orium· Toronto, Ontario, Canada
- Series A
- 264 employees
- Founded 2009
- 6BioRender· Toronto, Ontario, Canada
- Series A
- 227 employees
- Founded 2017
- 7FacilityOS· North York, Ontario, Canada
- Series A
- 208 employees
- Founded 2014
- 8Rail· Toronto, Ontario, Canada
- Series A
- 184 employees
- Founded 2021
- 9Private AI· Toronto, Ontario, Canada
- Series A
- 171 employees
- Founded 2019
- 10ResQ· Toronto, Ontario, Canada
- Series A
- 168 employees
- Founded 2018
- 11Adeptmind· Toronto, Ontario, Canada
- Series A
- 158 employees
- Founded 2016
- 12Irwin, a FactSet company· Toronto, Ontario, Canada
- Series A
- 154 employees
- Founded 2017
- 13Marble· Toronto, Ontario, Canada
- Series A
- 150 employees
- Founded 2016
- 14epiCura· Rivalta di Torino, Piedmont, Italy
- Series A
- 128 employees
- Founded 2017
- 15Ratehub.ca· Toronto, Ontario, Canada
- Series A
- 112 employees
- Founded 2010
- 16Method CRM· Toronto, Ontario, Canada
- Series A
- 112 employees
- Founded 2010
- 17Horizon· Toronto, Ontario, Canada
- Series A
- 98 employees
- Founded 2017
- 18Mosaic AI· Toronto, Ontario, Canada
- Series A
- 97 employees
- Founded 2021
- 19Briza· Toronto, Ontario, Canada
- Series A
- 96 employees
- Founded 2016
- 20Phoenix· Toronto, Ontario, Canada
- Series A
- 94 employees
- Founded 2019
- 21CrowdRiff· Toronto, Ontario, Canada
- Series A
- 93 employees
- Founded 2011
- 22CapIntel· Toronto, Ontario, Canada
- Series A
- 86 employees
- Founded 2019
- 23OneClass· Toronto, Ontario, Canada
- Series A
- 85 employees
- Founded 2010
- 24Peak Power Inc· Toronto, Ontario, Canada
- Series A
- 84 employees
- Founded 2015
- 25Thornhill Medical· North York, Ontario, Canada
- Series A
- 84 employees
- Founded 2004
Find engineers at Series A companies in Toronto
Series A companies in Toronto are some of the fastest-moving employers in the market. The list above ranks the largest Series A-stage companies headquartered in Toronto by current headcount, drawn from public LinkedIn and Crunchbase records. With 129 matching companies in our 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 Torontotalent 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 Toronto” or “senior engineers at Series A companies in Toronto hiring” and Refolk returns a ranked shortlist with evidence behind each match.
How this list is built
Last refreshed: Thu, 07 May 2026 07:57:16 GMT
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