Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware 86-1458374 (State or other jurisdiction of incorporation or organization) 1521 Westbranch Drive, Suite 100 McLean, Virginia 22102 (Address of principal executive offices) (Zip Code) (I.R.S. Employer Identification No.) (703) 287-5800 (Registrant's telephone number, including area code) For the quarter ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-40707 Gladstone Acquisition Corporation (Exact name of registrant as specified in its charter) Delaware 86-145 ...