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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.

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

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

  1. 1
    LifeLabs Medical Laboratory Services· Etobicoke, Ontario, Canada
    • Series A
    • 4.3k employees
    • Founded 2011
  2. 2
    JAM· Toronto, Ontario, Canada
    • Series A
    • 728 employees
    • Founded 1996
  3. 3
    Vosyn· Etobicoke, Ontario, Canada
    • Series A
    • 508 employees
    • Founded 2023
  4. 4
    Umbra· Scarborough, Ontario, Canada
    • Series A
    • 345 employees
    • Founded 1979
  5. 5
    Orium· Etobicoke, Ontario, Canada
    • Series A
    • 265 employees
    • Founded 2009
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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 136 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

Refolk pulled Series A companies headquartered in Toronto 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 09:36:57 GMT

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