Company details
Ostrom
Digital green energy supplier serving German households with a fully online flat-rate tariff and a transparent dynamic pricing option.
Straßburger Straße 55, 10405 Berlin
Ghost roles: 1 of 2 open
Stability signals
- CEO
- Matthias Martensen
- Founders
- Matthias Martensen, Karl Villanueva
- Total raised
- €34M
- Recent rounds
- June 2025 · €20M · Series B
- December 2022 · €9M · Series A
- January 2022 · €4M · Pre-seed / Seed
- Founders' prior
companies - HelloFresh, Entrepreneur First
Verified 2026-05-30
At a glance
Open roles
2
activeNew this month
0-1
Down from last monthNew openings
1
opened in the last 90 daysGerman requirement
100%
based on 2 of 2 rolesOpen roles over time
Open roles · 12 months
2open
2025-11 → 2026-10Oct is month to date