Around 2020, Siemens recognized the escalating threat of cybersecurity attacks on corporate supply chains and observed a rising frequency, severity and sophistication of attacks in its supply chain. It was obvious that no single player would be able to establish broader supply-chain security standards. On the contrary, collaboration and partnering were necessary. Siemens embarked on a proactive journey to fortify its global cybersecurity posture by following the third principle of the “Charter of Trust”: manage the ecosystem. Founded in 2018 at the Munich Security Conference, the Charter of Trust (CoT) was initiated by Siemens to join forces with partner companies safeguarding society and businesses against the increasing exposure to malicious cyberattacks. Together with CoT partners and service providers such as TÜV SÜD, OneTrust and Panorays, Siemens tested various approaches to ensure adherence to a set of baseline requirements for supply-chain security. After a global announcement, more partners joined the test phase from November 2021. This initiative identified external service providers and laid the groundwork for enhanced transparency and scalability within Siemens’ supply chain. Challenges in stakeholder identification and in convincing providers to tailor solutions were overcome with a gradual approach, starting with pilot assessments. The key takeaway emphasizes the pivotal role of partnering with an extended partner ecosystem for ensuring sustained success in cybersecurity resilience across the supply chain.