K2 Space, the California-based developer of large, high-power satellite platforms, announced a $250 million Series C at a $3 billion valuation, accelerating delivery of a new generation of spacecraft built for the heavy-lift era. The financing follows $500 million in signed contracts across commercial and U.S. government customers and is led by Redpoint, with participation from accounts advised by T. Rowe Price Associates, Inc., and from Hedosophia, Altimeter, Lightspeed, and Alpine Space Ventures.