Firefly Aerospace is owned primarily by AE Industrial Partners LP, which holds about 40.88% of shares. Other significant shareholders include Astera Institute with 8.951%, Thomas Markusic (the company's founder) with 5.206%, and Mitsui & Co., Ltd. with 3.504% ownership. The company also has a mix of institutional investors, retail investors, and insiders holding various smaller percentages.

Thomas Markusic founded Firefly Aerospace in 2017, and he retains a significant ownership stake while also serving as an insider. The company went public with a valuation exceeding $6 billion in 2025 and has institutional backing as well as insider ownership.