United Kingdom · 
Who invested in Isembard?
Isembard's investors include Notion Capital, Union Square Ventures, IQ Capital, Tamarack Global and CIV, and 11 more on record. Union Square Ventures led its latest round.
2026
$9.3MSeed$50MSeries A
United Kingdom · Series A startup
Who invested in Isembard
2 rounds we have observed, with the 16 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 8 months ago
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Funding summaryUpdated 5 Nov 2026
$59Mraised across 2 rounds since 2025, from 2 sources
$9.3MSeed$50MSeries A
- Latest round
- Series A, $50MMar 2026
- Led by
- Union Square Ventures
- Step-upi
- 5.4×
- Investors
- 16 (2 led)
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, $9.3M Apr 2025
- Biggest round
- $50M Series A · Mar 2026
- Between rounds
- 11 months from the last two
The rounds
- Mar 2026Series A$50M7 new1 returning
Union Square VenturesLead
Notion Capital
IQ Capital
Tamarack Global
CIV- Alex Bouaziz
- Andrei Danescu
- Matt Briers
Reported by Ventureburn
- Apr 2025
Funding filed with regulators
Isembard filed 2 raises, $40M in all. Filings say how much was sold and to how many investors; they never name the investors.
- Mar 2026$35MUK share allotment
- Mar 2025$5.2MUK share allotment
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
Alex BouazizVC firm1round
Andrei DanescuAngel1round
Basis CapitalVC firm1round
Joshua WesternVC firm1round
Matt BriersAngel1round
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 4 firms list Isembard as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Isembard
How much has Isembard raised?
Isembard has raised $59M across 2 rounds since 2025.
When did Isembard last raise?
Isembard's most recent round was a Series A of $50M in Mar 2026, led by Union Square Ventures.
What was Isembard's biggest round?
Its most recent round, $50M in Mar 2026, is also its largest on record.
Who backed Isembard first?
Isembard's first round on record, in Apr 2025, was backed by Notion Capital, 201 Ventures and Andreas Klinger and 6 others.
What stage is Isembard at?
Isembard's latest named round is a Series A, in Mar 2026.
Where is Isembard based?
Isembard is based in the United Kingdom.
Who led Isembard's rounds?
Notion Capital led the Seed in 2025; Union Square Ventures led the Series A in 2026.
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