X0306 4 2021-09-08 1 0001704760 American Virtual Cloud Technologies, Inc. AVCT 0000015615 MASTEC INC 800 S DOUGLAS ROAD, 12TH FLOOR CORAL GABLES FL 33134 0 0 1 0 Common Stock 2021-09-08 4 C 0 1001060 3.45 A 2702060 D Series A Convertible Debenture 3.45 2021-09-08 4 C 0 3453655.77 0.00 D 2020-04-07 Common Stock 1001060 0 D Reflects the mandatory conversion (the "Conversion") of a certain convertible debenture (the "Convertible Debenture"), subject to Securities Exchange Act of 1934 Rule 16b-6(b). Represents the principal amount (inclusive of accreted interest, pursuant to the terms of the Convertible Debenture) that was outstanding under the Convertible Debenture as of the date of Conversion. The expiration date is the date that the principal amount of the Convertible Debenture (together with all accrued but unpaid interest thereon) is paid in full, subject to mandatory conversion of the Convertible Debenture in whole pursuant to the terms thereof. Determined by dividing $3,453,655.77, the principal amount of the Convertible Debenture as of the date of Conversion, by the conversion price of $3.45. /s/ Albert de Cardenas 2021-09-10