CoreOS raised a total of $48.1 million across Seed, Series A, and Series B rounds before its acquisition. Its funding history includes a $120K Seed round, an additional undisclosed Seed round, two Series A rounds totaling $20M, and a $28M Series B led by GV in May 2016. With a team of 51-100 employees, CoreOS became a Kubernetes pioneer, developing enterprise orchestration tools like Tectonic and key open-source projects such as etcd and CoreOS Linux. Its innovation positioned the company as an essential contributor to modern container infrastructure.