United States · 
Who invested in Promethium?
Promethium's investors include Zetta Venture Partners, Insight Partners and 406 Ventures.
2019202020212022
$2.5MSeed$26MSeries AUnited States · Series A startup
Who invested in Promethium
2 rounds we have observed, with the 3 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.
Funding summaryUpdated 26 Oct 2026
$29Mraised across 2 rounds since 2018, from 2 sources
$2.5MSeed$26MSeries A
- Latest round
- Series A, $26MFeb 2022
- Step-upi
- 10.4×
- Investors
- 3
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Seed, $2.5M Oct 2018
- Biggest round
- $26M Series A · Feb 2022
- Between rounds
- 3.3 years from the last two
PromethiumCleantech1 / 15Their pitch deckPromethium's pitch deck, 15 slidesEach slide read for what it argues, against the decks that raised at the same stage.→The rounds
- Feb 2022
- Oct 2018
Who was in which round
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Quick answers about Promethium
How much has Promethium raised?
Promethium has raised $29M across 2 rounds since 2018.
When did Promethium last raise?
Promethium's most recent round was a Series A of $26M in Feb 2022.
What was Promethium's biggest round?
Its most recent round, $26M in Feb 2022, is also its largest on record.
Who backed Promethium first?
Promethium's first round on record, in Oct 2018, was backed by Zetta Venture Partners.
What stage is Promethium at?
Promethium's latest named round is a Series A, in Feb 2022.
Where is Promethium based?
Promethium is based in the United States.
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