SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* BC Partners Holdings Ltd (Last) (First) (Middle) WEST WING, FLOOR 2, TRAFALGAR COURT, LES BANQUES (Street) ST. PETER PORT Y7 GY1 4LY (City) (State) (Zip)	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)
	3. Date of Earliest Transaction (Month/Day/Year) 10/01/2022
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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
Class A Common Stock	10/01/2022		M		6,000	A	(1)	68,317,440	I	By BCEC-SIS Holdings, L.P.(2)

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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)	10/01/2022		M			6,000	(3)	(3)	Class A Common Stock	6,000	$0	0	I	By BCEC-SIS Holdings, L.P.(2)

1. Name and Address of Reporting Person* BC Partners Holdings Ltd (Last) (First) (Middle) WEST WING, FLOOR 2, TRAFALGAR COURT, LES BANQUES (Street) ST. PETER PORT Y7 GY1 4LY (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BC Partners Group Holdings Ltd (Last) (First) (Middle) WEST WING, FLOOR 2, TRAFALGAR COURT, LES BANQUES (Street) ST. PETER PORT Y7 GY1 4LY (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BCEC Management X Ltd (Last) (First) (Middle) ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE (Street) ST PETER PORT Y7 GY1 3RD (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CIE Management IX Ltd (Last) (First) (Middle) ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE (Street) ST PETER PORT Y7 GY1 3RD (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BCEC-SIS Holdings L.P. (Last) (First) (Middle) ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE (Street) ST PETER PORT Y7 GY1 3RD (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Class A common stock.

2. The general partners of BCEC-SIS Holdings L.P. (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.

3. The RSUs vest on October 1, 2022 and have no expiration date.

Remarks:

	BC Partners Holdings Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director	10/04/2022
	BC Partners Group Holdings Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director	10/04/2022
	BCEC Management X Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director	10/04/2022
	CIE Management IX Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director	10/04/2022
	BCEC-SIS Holdings, L.P., By: /s/ Lee Clark, Name: Lee Clark, Title: Director of the General Partners	10/04/2022
	** Signature of Reporting Person	Date
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* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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