Who invested in Istesso

3 rounds we have observed, with the 2 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.

BiotechHealthcare

Funding summaryUpdated 26 Oct 2026

$29Mraised across 3 rounds since 2019, from 3 sources

$5.2MRound$13MVenture$11MRound

Latest round: Round, $11MApr 2023
Biggest round: $13MVenture · Feb 2019
Investors: 2

See who backed them

The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

20192020202120222023

$5.2MRound$13MVenture$11MRound

First round: Round, $5.2M
Biggest round: $13M
Between rounds: 4.3 years

The rounds

Apr 2023
Round$11M
No investor was named in the report.
Shares issued, filed with Companies House (SH01); no report of this raise yet
Feb 2019
Round$5.2M
No investor was named in the report.
Reported by Ipgroupplc
Feb 2019
Venture$13M2 new
- Parkwalk
- IP Group
Source recorded

Funding filed with regulators

Istesso filed one raise, $11M in all. Filings say how much was sold and to how many investors; they never name the investors.

Apr 2023$11MUK share allotment

Founders and team

From Istesso's own website: 2 founders, 8 on the team.

Lisa PatelChief Executive Officer, Co-Founder

Sam WilliamsChairman, Co-Founder

Andrea HaynesHead of Translational Sciences
Craig RichardsonBoard
Dr Michael OwenNon-Executive Director
Fatima Garcia-RaposoProject Manager
Gemma VallanceOperations Manager
Greg SmithNon-Executive Director
Peter AllenNon-Executive Director
Professor Sir Keith PetersNon-Executive Director

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.

Round2019Venture2019Round2023

Parkwalk

IP Group

Everyone who backed them

ParkwalkVC firm1round

IP GroupVC firm1round

Missing a round, or an investor who was in one? Tell us.

Also claim to have backed them

This firm lists Istesso 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.