On December 7, 2021, BigBear.ai Holdings, Inc. (f/k/a GigCapital4, Inc. (“GigCapital4”)) (the “Company” or “New Big Bear”) closed its business combination (the “Business Combination”) with BigBear.ai Holdings, LLC, a Delaware limited liability company (“BigBear”) pursuant to that certain Agreement and Plan of Merger (the “Merger Agreement”), dated as of June 4, 2021, with GigCapital4 Merger Sub Corporation, a Delaware corporation and wholly owned subsidiary of GigCapital4 (“Merger Sub”), BigBear, and BBAI Ultimate Holdings, LLC, a Delaware limited liability company. The Merger Agreement was subsequently amended by the parties on August 6, 2021 and on November 29, 2021. In connection with the consummation of the Merger, the Company changed its name from GigCapital4, Inc. to BigBear.ai Holdings, Inc. Certain terms used in this Current Report on Form 8-K have the same meaning as set forth in the definitive proxy statement (the “Definitive Proxy Statement”) filed with the Securities and Exchange Commission (the “SEC”) on November 5, 2021 by GigCapital4.