Item 4.01 Changes in Registrant's Certifying Accountant

On February 24, 2021, the Audit Committee of the Board of Directors of Teligent, Inc. ("Teligent" or the "Company") appointed Grassi & Co. CPAs, P.C. ("Grassi & Co.") as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2021, subject to approval by the Company's stockholders at the 2021 annual meeting of stockholders. During the fiscal years ended December 31, 2019 and December 31, 2020, respectively, and the subsequent period through February 24, 2021, neither the Company nor anyone acting on its behalf has consulted with Grassi & Co. on any of the matters or events set forth in Item 304(a)(2)(i) or 304(a)(2)(ii) of Regulation S-K.

As previously reported, on January 15, 2021, Deloitte & Touche LLP ("Deloitte"), the independent registered public accounting firm of the Company for the fiscal year ended December 31, 2020, notified the Company of its decision not to stand for re-appointment as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2021. Deloitte will complete the audit of the Company's consolidated financial statements for the year ended December 31, 2020.

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