Sec Form 4 Filing - MASTEC INC @ American Virtual Cloud Technologies, Inc. - 2021-09-08

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person MASTEC INC 2. Issuer Name and Ticker or Trading Symbol American Virtual Cloud Technologies, Inc. [ AVCT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 800 S DOUGLAS ROAD, 12TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 09/08/2021 (Street) CORAL GABLES, FL33134 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 09/08/2021 C( 1 ) 1,001,060 A $ 3.45 2,702,060 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Series A Convertible Debenture $ 3.45 09/08/2021 C( 1 ) 3,453,655.77 ( 2 ) 04/07/2020 ( 3 ) Common Stock 1,001,060 ( 4 ) $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other MASTEC INC 800 S DOUGLAS ROAD, 12TH FLOOR CORAL GABLES, FL33134 X Signatures /s/ Albert de Cardenas 09/10/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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). ( 2 )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. ( 3 )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. ( 4 )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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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