Sebastian Heitmann is a co-founder and Partner at Extantia. The firm’s timeline dates its formation work to 2019 and the launch of its first fund to 2020.
Extantia invests primarily in Europe from Seed to Series A across climate software and hardware. It supports portfolio companies beyond capital with commercialisation, organisational scaling and fundraising.
In 2024, Extantia reported the final close of its flagship fund at €204 million.
His mentoring draws on lessons from comparable business situations rather than abstract instructions. He is relevant to founders moving from technical development into customer adoption, building the organisation around a complex product or preparing for institutional financing.
Where Sebastian can help
- climate tech
- industrial tech
- hardware
- software
- fundraising
Operating and investing experience
A selection of companies and roles connected to Sebastian Heitmann.
Ventures
Extantia
Co-founder & Partner; Seed-to-Series-A climate investor across software and hardware, primarily in Europe.
Highlights
- Co-founded Extantia, whose timeline dates its formation to 2019 and first fund launch to 2020.
- Extantia invests from Seed to Series A across software and hardware, with commercialisation and scaling support.
- Extantia reported a €204 million final close for its flagship fund in 2024.
Questionsfounders ask aboutSebastian Heitmann
Where can Sebastian help founders?
Sebastian helps founders navigate the capital demands and commercial hurdles of climate tech, from structuring venture rounds to taking hardware and industrial software into enterprise markets.
Which company-building situations are most relevant to Sebastian’s experience?
He is best suited for climate and industrial tech founders moving from technical development into scalable commercial deployment and institutional capital raising.
What perspective does Sebastian bring as a mentor?
He brings the perspective of an early-stage climate investor and Extantia co-founder, using lessons from comparable situations to make founder discussions practical.
The best mentors spot the best founders early.
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