X0306 4 2022-07-29 0 0001794905 Cyxtera Technologies, Inc. CYXT 0001709681 BC Partners Holdings Ltd WEST WING, FLOOR 2, TRAFALGAR COURT, LES BANQUES ST. PETER PORT Y7 GY1 4LY GUERNSEY 0 0 1 0 0001792292 BC Partners Group Holdings Ltd WEST WING, FLOOR 2, TRAFALGAR COURT, LES BANQUES ST. PETER PORT Y7 GY1 4LY GUERNSEY 0 0 1 0 0001875653 BCEC Management X Ltd ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE ST PETER PORT Y7 GY1 3RD GUERNSEY 0 0 1 0 0001518072 CIE Management IX Ltd ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE ST PETER PORT Y7 GY1 3RD GUERNSEY 0 0 1 0 0001917915 BCEC-SIS Holdings L.P. ARNOLD HOUSE PO BOX 273 ST JULIAN'S AVENUE, ST PETER, PORT GUERNESEY GY1 3RD 0 0 1 0 Class A Common Stock 2022-07-29 4 J 0 109850000 0.00 D 0 I By SIS Holdings LP Class A Common Stock 68311440 I By BCEC-SIS Holdings, LP. Represents a pro-rata distribution in-kind by SIS Holdings LP to its members for no consideration. The general partner of SIS Holdings LP is SIS Holdings GP, LLC, which is managed by a board of directors, a majority of which is appointed 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. BC Partners Holdings Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 2022-08-02 BC Partners Group Holdings Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 2022-08-02 BCEC Management X Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 2022-08-02 CIE Management IX Limited, By: /s/ Lee Clark, Name: Lee Clark, Title: Director 2022-08-02 BCEC-SIS Holdings L.P., By: /s/ Lee Clark, Name: Lee Clark, Title: Director of the General Partners 2022-08-02