United States · Series B startup
6 rounds we have observed, with the 14 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Raised 9 months agoY Combinator: S19
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Funding summaryUpdated 5 Nov 2026
$140Mraised across 6 rounds since 2023, from 6 sources
Each circle is a round, placed by date and sized by amount. The line above is the running total.
No investor was named in the report.
Source recorded
Source recorded
From Tandem's own website: 3 on the team.
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
AccelL
Antler
Goodwater Capital
QED Investors
Headline
Everywhere Ventures
Seedrs
Ascension
Drive Capital
Corazon CapitalMissing a round, or an investor who was in one? Tell us.
This firm lists Tandem as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.
Tandem's investors include Accel, Antler, Goodwater Capital, QED Investors and Headline, and 9 more on record. Accel led its latest round.
Tandem has raised $140M across 6 rounds since 2023.
Tandem's most recent round was a Series B of $100M in Jan 2026, led by Accel.
Its most recent round, $100M in Jan 2026, is also its largest on record.
Tandem's first round on record, in Feb 2023, was backed by Drive Capital and SBXi Fund.
Tandem's latest named round is a Series B, in Jan 2026.
Tandem is based in the United States.
Accel led the Series B in 2026.
In the same sector, and raised in the last eighteen months.
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United States · 
