Sec Form 3 Filing - MEDINA MANUEL D @ Appgate, Inc. - 2021-10-12

FORM 3 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 MEDINA MANUEL D 2. Issuer Name and Ticker or Trading Symbol Appgate, Inc. [ APGT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) Executive Chairman (Last) (First) (Middle) 2333 PONCE DE LEON BOULEVARD, SUITE 900 3. Date of Earliest Transaction (MM/DD/YY) 10/12/2021 (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, par value $0.001 per share 117,149,920 ( 1 ) I By SIS Holdings LP ( 1 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other MEDINA MANUEL D 2333 PONCE DE LEON BOULEVARD, SUITE 900 CORAL GABLES, FL33134 X X Executive Chairman Signatures /s/ Jeremy M. Dale, Attorney-in-Fact 10/22/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Medina Capital Fund II - SIS Holdco, L.P. ("Medina Stockholder") has the right to nominate certain members of the board of directors of SIS Holdings GP, LLC subject to majority control of the board by BCEC - SIS Holdings L.P. Medina Capital Fund II - SIS Holdco GP, LLC, which is ultimately controlled by Manuel D. Medina, is the general partner of the Medina Stockholder. As a result, Mr. Medina and each of the foregoing entities may be deemed to share beneficial ownership over securities owned by the Medina Stockholder, through its interest in SIS Holdings LP. Mr. Medina disclaims beneficial ownership of all shares of common stock owned by the Medina Stockholder, through its interest in SIS Holdings LP, except to the extent of his pecuniary interest therein.

Remarks: See Exhibit 24.1 - Power of Attorney

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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