X0306 4 2015-02-19 0001005757 CSG SYSTEMS INTERNATIONAL INC CSGS 0001382513 Ruble Joseph Thomas 9555 MAROON CIRCLE ENGLEWOOD CO 80112 1 EVP, Gen Counsel, Sectry & CAO Common Stock 2015-02-19 4 A 0 17928 30.12 A 117072 D Common Stock 2015-02-19 4 A 0 11953 30.12 A 129025 D Common Stock 2015-02-19 4 F 0 1076 30.12 D 99144 D These awards vest only upon the achievement of objective performance goals over a three-year period. All or a portion of these shares may vest only upon satisfying a combination of the following financial criteria, measured both annually, and on a cumulative basis: (i) achievement of a specified adjusted net income; and (ii) achievement of a specified revenue target. In addition, any shares that do not vest because of the level of financial criteria achieved, can vest upon the achievement of a specified company stock price, measured at the end of the three year period. 3,007 shares of restricted stock held by Mr. Joseph T. Ruble vested February 19, 2015. The sold shares reported on this form represent those shares sold to cover a portion of the personal income tax withholding requirements as a result of such vesting. Joseph T. Ruble 2015-02-22