Sec Form 4 Filing - BC Partners Holdings Ltd @ Cyxtera Technologies, Inc. - 2022-06-08

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 BC Partners Holdings Ltd 2. Issuer Name and Ticker or Trading Symbol Cyxtera Technologies, Inc. [ CYXT] 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) WEST WING, FLOOR 2, TRAFALGAR COURT,, LES BANQUES 3. Date of Earliest Transaction (MM/DD/YY) 06/08/2022 (Street) ST. PETER PORT, Y7GY1 4LY 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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

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 Restricted Stock Unit ( 1 ) 06/08/2022 A 27,588 ( 2 ) ( 1 ) Class A Common Stock 27,588 $ 0 27,588 I By BCEC-SIS Holdings, LP.( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Directo r 10% Owner Officer Other BC Partners Holdings Ltd WEST WING, FLOOR 2, TRAFALGAR COURT, LES BANQUES ST. PETER PORT, Y7GY1 4LY X BC Partners Group Holdings Ltd WEST WING, FLOOR 2, TRAFALGAR COURT, LES BANQUES ST. PETER PORT, Y7GY1 4LY X BCEC Management X Ltd ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE ST PETER PORT, Y7GY1 3RD X CIE Management IX Ltd ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE ST PETER PORT, Y7GY1 3RD X BCEC-SIS Holdings L.P. ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE, ST PETER, PORT GUERNESEYGY1 3RD X Signatures BC Partners Holdings Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 06/10/2022 Signature of Reporting Person Date BC Partners Group Holdings Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 06/10/2022 Signature of Reporting Person Date BCEC Management X Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 06/10/2022 Signature of Reporting Person Date CIE Management IX Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 06/10/2022 Signature of Reporting Person Date BCEC-SIS Holdings L.P., By: /s/ Lee Clark, Name: Lee Clark, Title: Director of the General Partners 06/10/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each restricted stock unit ("RSU") represents a contingent right to receive one share of Class A common stock and has no expiration date. ( 2 )The RSUs vest on June 8, 2023. ( 3 )These securities are held of record by BCEC-SIS Holdings L.P. (the "BC Stockholder"). The general partners of the BC Stockholder are CIE Management IX Limited and BCEC Management X Limited, which are controlled by the board of directors, which are appointed by BC Partners Group Holdings Limited, which is a majority owned subsidiary of BC Partners Holdings Limited, which is controlled by Lee Clark, Karen Jamieson and Mark Rodliffe. As a result, each of the foregoing entities may be deemed to share voting and investment power over the shares held directly by the BC Stockholder but disclaim beneficial ownership of the securities reported herein except to the extent of their pecuniary interest therein.

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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