X0306 4 2020-12-08 0001738177 Cambium Networks Corp CMBM 0001357262 Slusky Alexander R C/O VECTOR CAPITAL MANAGEMENT, L.P. ONE MARKET ST, STEUART TOWER, 23RD FLOOR SAN FRANCISCO CA 94105 true true Ordinary Shares 2020-12-08 4 S 0 2500000 26.6 D 15204754 I See footnotes Ordinary Shares 1482000 I See footnotes Ordinary Shares 18000 I See footnotes These Ordinary Shares are held directly following this offering by Vector Cambium Holdings (Cayman), L.P. ("VCH"). These shares are directly owned by Vector Capital IV, L.P. ("VC IV"). These shares are directly owned by Vector Entrepreneur Fund III, LP ("VEF III"). Vector Capital Partners IV, L.P. ("VCP IV") is the general partner of VCH and VC IV. Vector Capital Partners III, L.P. ("VCP III") is the general partner of VEF III. Vector Capital, Ltd. and Vector Capital, L.L.C. are the general partners of each of VCP IV and VCP III. The board of directors of Vector Capital, Ltd. has the exclusive power and authority to vote, or to direct to vote, and to dispose, or to direct the disposition of, the shares held by each of VCH, VC IV and VEF III and therefore holds indirect voting and dispositive power over the shares held by each of VCH, VC IV and VEF III and may be deemed to be the beneficial owner of such shares. The Reporting Person is the Chief Investment Officer of Vector Capital Management, L.P., and disclaims beneficial ownership of such shares in excess of his pecuniary interest in such shares. /s/ Sally Rau, attorney-in-fact 2020-12-10