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Sierra Space Closes $550 Million Series C Round

03.05.26

Simpson Thacher advised Sierra Space, an industry leading defense-tech space company delivering solutions for the nation’s critical missions and advancing the future of security in space, in its $550 million Series C funding round. LuminArx Capital Management led the round.

The Simpson Thacher team included Roxane Reardon, Kirsten Harmon, Matthew Hart, William Perrone, Cara Capoccitti and Marlena Choupo (Capital Markets); Jonathan Cantor, Andrew Purcell and Jemma Li (Tax); Ron Ben-Yehuda and Chandler Gerard-Reimer (Intellectual Property); and Ryan Stott and Andrew Blau (Executive Compensation and Employee Benefits).