System.One | Activity | F4

Team Portfolio Raise Essays

F4/System.One/Activity

System.One Activity

Every public signal F4 has attached to this firm, with sources and cross-entity links.

Types

Time range

Investment

Participated in Hop Aero's $11M seed led by Initialized Capital.

Hop Aero

Hop Aero System.One

finsmes.comOCT 2026

payloadspace.com

OCT 2026

Investment

Followed on in Mondoo's $17.5M Series A extension led by HV Capital.

Mondoo

Mondoo System.One

siliconangle.comSEP 2025

SEP 2025

Exit

Portfolio company lemon.markets agreed to be acquired by dwpbank.

Lemon Markets

Lemon Markets System.One

fintechfutures.comAUG 2025

AUG 2025

Press

Featured as the first German solo VC to launch a fund, in 2016.

Business Insider / Gruenderszene feature on solo VCs

businessinsider.deJUN 2023

JUN 2023

Podcast

Max Claussen discussed running a pre-seed fund in Europe as a one-person shop on Venture Confidential.

Max Claussen on Heavybit's Venture Confidential

heavybit.comOCT 2017

OCT 2017