X0306 4 2022-09-01 1 0001005757 CSG SYSTEMS INTERNATIONAL INC CSGS 0001931869 Binford Alfred George 6175 SOUTH WILLOW DRIVE 10TH FLOOR GREENWOOD VILLAGE CO 80111 1 President, Customer Engagement Common Stock 2022-09-01 4 D 0 4793 0 D 15127 D Common Stock 2022-09-01 4 D 0 5369 0 D 9758 D Common Stock 2022-09-01 4 F 0 963 57.56 D 8795 D The reporting person's employment with the company ended on September 1, 2022, and reported shares represent a pro-rata portion of unvested shares canceled from previous time-based restricted stock awards. The reporting person's employment with the company ended on September 1, 2022, and reported shares represent a pro-rata portion of unvested shares canceled from previous performance-based restricted stock awards. The reporting person's employment with the company ended on September 1, 2022, and reported shares represent shares withheld by the issuer to cover tax withholding obligations upon vesting of time-based restricted stock awards. /s/ Nicholas Claassen, attorney-in-fact for Alfred George Binford 2022-09-06